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First I was a little bummed out. Dropped in to see my buddy and asked
him about the pump. When he tried to find it, all he could find was an
old hand diafram(?) pump. Then as we're sitting there having coffee,
he mentions an older guy up the road had just had a yard sale, in
which he had a couple of different pumps left on the last day, so he
may still have them. So I take a drive up to meet the guy and see what
he had left... and there it was, an old piston pump, with 1/6th hp
110v motor already hooked up... with a short pipe plus foot valve on
it... 25$

Water problem solved for now just like that...

Then, I stop off at another buddies place and he mentions his brother
is living on the back of their property with no grid connection, but
has power, so I take a drive around to his place. Three little solar
panels hooked to an old car battery power his lights, radio (car
radio/tape player) and water pump. The water pump is a jet pump, so I
was a little surprised. I asked what the motor was on it, and he got a
funny look on his face and said, uhm... I'm not really sure, I kept
rebuilding and rewinding it until it did what I wanted. When I had
first got there, he had been outside welding up a little trailer for
his four-wheeler using a home built gas generator/welder. Next time we
head out, I am bring along some of the plans for the windmills and
such that I have been collecting up. He has the skills, and shortly
will have the info he needs to get off gas totally, and along the way,
help me out...

Labels:

I've spent a large part of my adult life dealing with rip blades and wood. While you can rip slivers, the waste that the blades hog out isn't what you want.

Something more like what you get from using crosscut chain for ripping will actually be pretty close. We've done a lot of chainsaw lumber-making here also. Uneconomic until you get to the unusual requests. 6"x12"x50' oak beam? No problem, assuming a decent tree. Those shavings compost nicely. Waste from rip blades, decidedly less so.

You certainly can stack blades, that's what gang-rippers are (old ones often available cheap). But with heavier bodied blades to prevent body deformation. Freud makes an excellent blade with 20-odd teeth, 10". You won't find anybody stocking it, generally only sold to gang-rippers. Don't remember the model number offhand, but I'll dig it out if anybody's interested. NOT HarborFreight priced, my last one cost $45.

Alternatively, if you can find somebody using a Lucas sawmill, they'd be delighted if you hauled off their rip chips. Or even more so, anybody still using a large diameter blade mill.

I've been backed up with unrelated projects, but intend to have a sitdown with my retired machinist buddy to see what he can come up with. Given the volume required, it would seem best to have something working the speed of a commercial chipper. So far, he's never failed to figure out how to build whatever I dream up. Not that he knows much about wood.

Those links to commercial heat producers tickled my fancy. Still thinking about that. Real interesting.

If/when we come up with something functional, I'll yell. We have a stockpile of commercial paper blades, 4' wide with a hardened edge, razor-sharp. I used a pair for a tractor bucket cutting edge. Pretty amazing to push up against a 2" sapling and shear it off.

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Question:


 We have been trying to calculate the number of PV panels and batteries
 required to use on a stand alone system in a 5 sun hour per day area to
 provide 2000 KWH a month with a 4 day storage for cloudy days.

Answer:


First, How Many Batteries
2000 KWH/mo
Divide by 30 days 66.67 KWH/day
Times 4 days storage 266.67 KWH/daH
Multiply by 1000 for WH 266666.67 Watt Hours
Divide by 12 volts for AH 22222.22 Amp Hours
Divide by 200 Ah Batteries 111.11 200 AH Batteries

Now, going back to 66.67 KWH/day
Divide by 5 hours per day 13.33 KW to be generated for 5 hours
Multiply by 1000 13333.33 watts for 5 hours per day sun
Divide by 12 volts 1111.11 Amperes solar output
Divide by 3 amps 370.37 Harbor Freight 45 watt panel sets

Note, that this does not take any inefficiencies into account so in
practice you would need 10-20% more batteries and solar panels than
this shows. You also didn't say how often those 4 day cloudy periods
occur - in practice you need enough extra capacity to charge those
batteries on top of your daily usage, so the estimate for solar panels
could be low by another 20% or more.

Mostly this shows that the cheapest solar power you can make is the
power you DON'T consume and don't need to make. So, the first step is
always to figure out how little energy you can thrive on and then
design a system to exceed that.

Of course, once you are conserving to that level you may find the
resulting electric bill, and, for that matter, your carbon footprint,
might not justify further action. On the other hand, you may, like
many on this list, be far away from the grid or just want nothing to
do with connecting up.

__._,_.___

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I worked from home on monday and tuesday. I heard a truck in the driveway.
went out and was an older gentleman and his wife. They had heard I had a
wind generator and wanted to see it. Good thing I was home because he was
looking for a big one, I pointed to it we talked for 20 minutes or so.

THere are a lot of people really ticked at our electric coop. They bought
a small peaking plant just across the state line that sold out. Then they
raised our rates basically about 15% to cover the cost.

For this area we are probably the most expensive electricity in 50 mile
radius or more. NOt nearly as expensive as other parts of the country but
it still works out to real world number in the 14-17c/kwh assuming one
uses at least 200-300 kwh/month.

He came looking because he has two houses and his bill jumped to
$700/month. well even simple head math says he is going to have to do a
lot of changes to get down to where he can even think about going
renewable. Even at the cheapest enerstar rates that would have to be
3000 to 4000 kwh/month. He wasnt oblivious to what he needed to do, he had
converted to CF's, power stripped everything he coule but still not
putting a dent in it. I gave him some suggestions and my latest copy of
Home POwer and told him to feel free to stop by if he wanted to talk.

Wish I would have gotten his number or rememberd his name. he has electric
water heater and electric dryer. I'm sure those are a large percentage of
his bill, even wondered if maybe he had an element out in his water heater
causing the other to run near continuous and never quite getting things up
to temp. But I will have to hope maybe he stops by againl.

I'd like to at least try to talk through what might be the pig in his
house.

The real kicker is, we have corn uin the field this year so no one can see
us from the road. Its a small town but its a relatively small set of folks
that know and comprehend what I have power wise. He didnt tell me who
pointed him to me, I'd be curious.

If I thought I could make a living providing moral support for folks in
his boat, I might not mind doing it, but I am guessing my bills are still
a little too high to cut the cord to full time employment.

boy how is that for a ramble on a wednesday night.

bob
marshall, il
q

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Hi Will and everybody,
 
There are also low-temperature composting proponents.  I'm one.  What I get is less nutrient loss, no seed loss, and zero pile maintenance.  No turning, no temperature measuring, no watering.  The final product is actually nutrient-superior to high-temperature composting.  And full of worms.
 
What's been working for years here is to let plants I want go to seed, uproot anything I don't want and head them to the compost pile.  When I spread compost, I'm seeding my beds (which already had plant-broadcast seed).  No tilling needed or advised, just spread compost.  Then harvest.
 
Compost tea works, but I don't bother.  No need that I can see.  Just like saving (or purchasing) small seed and planting, no need.  I've found that saving select large seeds will ensure specific crops I want.  Might not have had a substantial fall snow pea crop otherwise.
 
For winter, in our 4166 heating degree-days, I place recycled sliding door glass (singles) over the beds after removing all tall plants.  We get continuous harvest until spring.
 
That's the extent of my effort, providing a substantial part of our diet.  What I don't get are tidy mono-crop beds.  One learns quickly which veggies grow well with which.  Cull what you don't want, just like any weed.  You are absolutely correct, healthy plants don't have insect/disease problems.    Even potatoes are bug-free here without any help from me.  Compost is the magic.  No bug deterrent required. 
 
If you have specific compost needs, Other Homes and Garbage ISBN 0-87156-141-7 contains the information necessary to select your compost pile ingredients.
 
Low-temperature composting requires some manure added to speed things along, similar to MEN's Pain-style compost pile when they didn't have the proper-sized chips.  For veggie-growing, you really want to know what's in that manure you're composting. 
 
Some broad-leaf herbicides are still active long after the trip through the animal.  Here, horse manure is plentiful, free for the hauling.  Wormers fed to horses don't survive low-temperature composting.  I make efforts to learn about the hay fed to the horses.  Adding manure directly to your beds is risky, I don't.
 
If I can get the Department of Transportation to bring a load or few of wood chips here, they go into the compost.  If not, my compost is mostly green material plus manure, adding whatever leaves are convenient. 
 
As my house is self-heated/cooled (PAHS), without my input, we have no need of compost pile heat.  Which was a question I needed to answer about creating a Pain-style pile.  For me, the answer was helping solar in my lumber kiln.  Particularly summers, when trees shade the kiln.  Chippers are under consideration, but not multiple saw blades.  I've got a nearly limitless hardwood supply and large yellow machinery.

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The only thing that is not electric in this house is the oil heat.
I have Electric water heater, Electric clothes dryer, Electric range
and oven. (we don't really cook on these much at all. Mostly
microwave, toaster oven and George F. grill)

I just got done entering all my electric bills for this house over
the last 5.5 years into a spreadsheet. When I first moved into this
house it used 25kWh/day.
First goal was the theoretical amount I could get from a car
alternator if I could run it 24/7. I pegged that at 1HP or 746 watts
just for the sake of argument times 24 hrs for about 18kWh/day.
Next goal was the theoretical amount I could generate if I could
afford to panel the whole south side of my roof with solar panels.
This is about 4kW times 4 hrs of sunlight or about 16kWh/day. Last 3
bills have all been about 15kWh/day.
Next goal is half of what this house started with or 12.5kWh/day.
After that just as low as I can go.
The short term goal is to be able to survive using an alternator
hooked to a lawn mower engine or later a diesel engine, my 3 panels,
4 batteries and a big PSW inverter when the grid goes down. I would
not be able to run the clothes dryer which I could do without or the
electric water heater which would be harder to do without but I could
run everything else in the house even if I had to do it one thing at
a time to stay alive and warm. In the mean time I am able to use the
power I do get from my panels and system to replace grid power by
doing small tasks around the house like lighting or running 12 volt
fans for house cooling or once in a while running my whole computer
room or the dishwasher or clothes washer or something like that.
Long term goal is a roof full of panels and a small windturbine, more
and better batteries and no more need for the grid.
According to the DOE in 2001, national average household electricity
usage was about 29kWh/day so at least I'm beating that.

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I've run my share of wood through a regular chipper/shredder and my
experience was that unless you've got at least 10 or more HP running it,
you have to wait for chipper to speed up after each pass at a good-sized
limb. I have been expounding upon an idea I have had in my head for some
time regarding a way to build a very reasonably-priced wood
shipper/shredder that might feed more evenly. I would alternately stack
about 10 sharp carbide circular saw blades with washers in between. I
would tighten down the shaft with enough torque to keep blades from
spinning, install bearings at both ends, then install drive pully at one
end. I would then install whole assembly in a 1/4" steel tapered box
section (like existing chipper/shredders) and you got the makings of a
pretty decent shredder. I say shredder instead of chipper because so
many teeth are involved. If a person used a stack of carbide blades from
Harbor Freight on sale, the overall affect would be cheaper chipper
blades that might stay sharper much longer and feed much smoother. A
person might need to feed wood into it slowly so as not to over-feed
unit and jam it. It might be even better if it had a set of syncronized
feeder rollers. Thinking more about how it would feed, I came up with 3
zones. The first zone being where the saw is coming towards the wood in
a bite/push fashion, the second zone would be the center area with a
bite/neutral while the 3rd would be the bite/pull zone. If the wood was
guided mostly to zones 1 & 2, there would be no over-feed with jamming.
Just a design thought. In another post, Bobby Yates came up with a
modification that might prevent any pieces of wood getting stuck in
between blades by adding a beveled washer on both ends to make the stack
wobble just slightly, say 1/8". We are now passing the manufacture of a
pair of wobble washers to the group. How could it be accomplished the
best? I might draw up something if it is needed for better
understanding.

 

Labels:

If you got the time and the space, let nature do the composting for
you. It happens automatically with any forest! Given enough time, a
solid hardwood log will fall apart in your hands! If you do not have
that kind of space and time, we look for ways to speed up the process. A
shredder is just one of the ways to speed the processes.
I had two reasons for thinking this simple shredder idea up. 1) I
needed a way to shred wood waste from limbs and other wood rubbish
without spending lots of monies 2) My goal is to use the uniformly
shredded material as part of the feed for making good compost. My goals
had never included harvest of the compost heat. The reason for that is,
to maximize the composting process I need to stir the batch as often as
necessary to control heat. Not enough heat and you never get good final
product. Too much heat and you get charcoal and burnt product(even
fire). If you get the heat right you get a rich compost that has gotten
hot enough to sterilize all the seeds (good and bad) and is full of good
micro-organisms. Some of this compost is applied to ground around
plants, some is brewed to make compost tea. All this process does is
provide an ideal environment for multiplication of good microbes. The
resulting solution is gently sprayed on leaves and ground for almost
disease-free, healthy plants without the use of chemicals!
You need a good accurate 3ft long probe to be able to test core
compost pile heat. Buy the digital one already made up for this process
and you will spend at least a couple hundred $.
Buy the Harbor Freight digital meat probe on sale for $5.99, take it
apart, wire up an extension for the probe end, use longer 1/4" pipe, and
you make the same thing for under $10. My goal here again is to save
monies.

Labels:

I use a table saw quite often and I know that hardwood will bog down a three horse power motor
easily and that is just one blade. Multiple blades are going to require
a lot of power. For instance, look at this thing
http://www.directindustry.com/prod/maquinas-pinheiro/automatic-multi-blade-rip-saw-21872-50641.html

That is a multi-blade rip saw and it has a 100 hp motor. There is also
the problem of feeding. A ten inch blade with a one inch arbor and
washers is only going to give you a feed capacity of 3 inches or so.
Then how do you keep the blades from quickly grabbing the wood and
binding up? If you have the blades cutting so they pull the wood they
are just going to grab on and stall the motor. If you have the blades
so they push the wood they are going to spit whatever you put in there
right back at you.

I have also had carbide teeth come right off saw blades from feeding too
fast and hitting a knot or nail. It would be a real pain to have to
take apart the whole blade stack and replace a blade every time a tooth
comes off.

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While extremist mud-hut environmentalists are pulling their hair out
over the near microscopic amount of mercury securely sequestered in
CFL's, here is the result of what NOT using CFL's has done to our
ecology - where all the tons of free mercury that are released into our
environment because we're so afraid of the pico-dot of mercury in a
twisty-bulb:

http://www.nytimes.com/2008/01/23/dining/23sushi.html

Tasty, hmmm??? Want salt with that mercury?

No solution is perfect - LED's use caustic chemicals to produce, CFL's
use a micro-dot of mercury. But - CFL's put out more useful light for
the energy used than any other commercially available light source,
which means tons of coal not being burned across the nation meaning tons
of mercury not being released into the atmosphere as a result.

Of course, it's even worse - the sushi isn't necessarily the fish
they're advertised to be:
http://www.nytimes.com/2008/08/22/science/22fish.html

So, in trying to avoid one fish, you may be eating the very fish you're
trying to avoid, or eating something far worse. But... you say you don't
eat sushi so what's up? Well... sushi does not have a monopoly on the
fish market or on corruption. It's a tiny segment - and if they're this
bad, you can believe that the rest is just as rotten to the core - both
in contamination and in corruption. And fish is also used in many
products that we consume or apply.

Of course to avoid it in the near term, all it takes is to put in a
decent little tank of your own - taking up little more room than a
child's wading pool - and raising your own fish - be it tilapia or
catfish or whatnot. But in the long term it's going to take
multinational cooperation in reducing coal burning power-plants output.
And that means choosing the lessor of two evils - choosing the CFL with
it's dot of mercury to avoid the release of ounces of mercury it will
prevent over it's life. It also means getting past all those crack-pots
who are protesting wind-farms and coming up with any lie to support
their opposition - noise keeps them from sleeping, birds get killed.
Sheesh - noise? People pay high dollar to live near the coast where
there's noise ALL the time. With all our roads, we all have the noise of
traffic 24/7 including Jake-breaks in the middle of flatland just
because the truckers are being obnoxious. Dogs barking all night. Cats
in heat. Neighbors booming music. Noise is ubiquitous in our lives and
they claim that wind-farms are noisy and should be banned? Bird kill -
most who say that have never been to a wind-mill. See any dead birds?
For every dead bird you find, I'll show you hundreds killed by
bird-strike on wind-shields of cars, and hundreds more killed by clear
windows on houses. Not to mention birds sucked up by jet engines. I've
hit birds. Several. I've also seen birds slam into windows head on.
Nearly messed my pants it startles me so much. But, I've never once seen
a dead bird from a mill. It can happen - but it's a lessor evil when
compared to the alternatives. You know, our traffic and windows has
killed more birds than West Nile Virus even! Sheesh.

Of course, I digress from the topic. What we do has an impact on the
environment that returns to bite us in one way or another. Wasteful
energy use comes back to us in our diets, poisoning us. Non-organic
agriculture creating entire dead-zones in the Gulf of Mexico from the
soluble fertilizers. And each of these are caused by each of us a little
bit at a time. So each of us can reduce it a little bit too. One CFL
bulb in each of our homes will make an enormous difference. Complete
conversions would make phenomenal differences. The only non-CFL's we
have are on variable switches - and I'm in the process of changing those
switches and replacing them bulbs too.

We just need to break past these fear-mongers and take a stand.

I do find this amusing:
"When told of the newspaper's findings, Andy Arons, an owner of Gourmet
Garage, said: "We'll look for lower-level-mercury fish."

Sooo.... is that like going to market and saying "I'd like the Mercury
Light fish, please." Look for lower-level-mercury fish - how do you
tell? Ask it? Hey, eat any mercury lately? Are they really going to take
samples from every fish and send it off to be tested? Typical response,
methinks - in other words - they have no idea of what they're buying and
sell this stuff hoping no one notices or comes and tests. Which...
someone did notice.

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At present my 2200's ( I have two ) use the onboard charger in the
UPS, which you CAN disable. ( there are lots of how to's on the
internet, but basically you clip a wire )

I have a solar charge setup that charges a very large battery bank 24
vdc battery bank that is seperate from the UPS battery banks.

both of my inverters use a 48vdc battery setup and i have a seperate
48vdc charger that i could use on those batteries, IF I NEEDED it. But
never have hooked it in.

I operate both UPS's standalone for my studio power and charge from
the grid. HOWEVER if I ever needed to charge the 48vdc batteries from
the solar, I would use the 48vdc charger I have.

My solar battery setup is 24vdc and uses a Xantrax charge controller.
That charge controller can be setup to charge 12, 24 or 48 vdc by
changing the switches. I have one extra as a spare.

SO if I needed to charge those other batteries in an extended grid
down situation I could use my 48vdc charge, or the Xantrax configured
for 48 vdc or the generator running the 48vdc charger.

My 48vdc charger is a LaMarche unit that will put out 50 amps and came
out of a Telecom install, has a normal and equalize switch and will
run on 120 or 220 VAC.

I have a two large battery banks on the two 2200's with each having
it's on fuses, and all hardware.

the batteries will run my studio lights, and computers for a long
time. I've ran it for 12 hours straight and only drained the batteries
halfway. Now I am NOT RUNNING 2200 kva and I guess the load is
somewhere around 200 watts on each UPS/Inverter.

I have all the necessary stuff to charge those batteries from my array
or solar, or gennie if need be. but at present leave it all as
installed until I need to make adjustments.

It does irk my wife when we have a power outage on the house ( not all
hooked in to the solar setup ) and the studio has full lights,
internet and computers, but the house only has lighting.

I plan to install two large whole house inverters someday that will
run both sides of my home panel, but at present only have this
capability on the studio.

those APC UPS's are long lived and even when i ran them for 12 hours
straight did not get hot or anything, but the fans did run the whole
time. But then again I did not have them at full load either.

i agree with
www.homebrewpower.co.uk that the BEST inverters going these days are the
Prosines, or the Outbacks, if you can afford them

These 2200 i payed 100 each and put in my own large battery, as the
batts that came with them were shot. 100 was cheap enough, and i know
I could use them as main inverters in a pinch.

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Figures released for large UK coal fired power
plants - for example Drax which is the 2nd largest coal fired power station
in Europe.

http://en.wikipedia.org/wiki/Drax_power_station

It burns between 7 and 11 million tonnes of coal per year and produces on
average 24 TWh of electricity to the grid. I'll let you do the ground work
and calculate the approximate efficiency - but I think that you will fid
that it is well below 40%.

For the figures to be meaningful you have to specify the calorific value of
the coal being burned. Lignite (Germany, Poland, N. Dakota) is only good
for 8500 BTU/lb. Bituminous and semi-bituminous coals are generally around
12,000 BTU/lb.

The efficiency of the plant can be increased by designing it for higher
steam temperatures and pressures -

Explained here

http://www.mhi.co.jp/en/technology/review/pdf/e423/e423094.pdf

However this adds significant additional cost - and most power companies
have been reluctant to follow this route - they're running a business for
profit after all, not wishing to get involved in high-risk super-effiecient
thermal designs - and so compromise between cost/complexity versus
efficiency is a deciding factor.

This 2005 Japanese plant manages 43% efficiency

http://www.mhi.co.jp/technology/review/pdf/e451/e451011.pdf

Here's a wiki entry for typical efficiencies of turbine based thermal
powerstations.

http://wapedia.mobi/en/Thermal_power_station

This document explains increases in efficiency since 1920 about 20%, rising
to about 30% in the 1950s. Modern stations are often taken as an avearge
efficiency of 38% stating that the best we are ever likely to achieve is
about 55%, but for practical reasons summarised on the last page, suggest
that we are likely only ever to see efficiencies of between 40% and 45% when
the station is connected to a real world fluctuating load.

For practical purposes, you can assume that 60% of the thermal energy in the
coal is lost to the atmosphere

http://www.sealnet.org/s/8.pdf


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Coal was traditionally gasified to make lighting gas and for running gas engines. With improved pipelines, natural gas began to become popular in the 1940s in the US and so manufacturing gas from coal fell almost into obscurity.

In the 1980s a coal gasification plant was built in North Dakota, with the purpose of converting the local brown coal into high purity methane that could be used for domestic and industrial heating in the local community.

At the time it was built, oil was cheap and so the economics didn't quite work out.

However, one of the by-products of the gasification was large volumes of pure CO2, and a pipeline was built to run 205 miles north up into Sascatchewan, so that the CO2 could be used to pressurise an oil field and get another 20 years of production from the declining field.

The process is detailed here:

http://www.dakotagas.com/Companyinfo/Gasification_Process.html

Coal gasification will likely become a viable energy conversion technology and it has the following advantages:

1. It converts low calorific value brown coal into high energy natural gas that is easier to transport and use.
2. The by-products are easily separated from the process and have commercial value for fertilisers and phenol feedstocks.
3. The CO2 is captured and can be sequestered in oil wells allowing extended production
4. Waste products - toxic metals etc are separated from the mix and can be appropriately handled
5. There is no requirement for an exhaust stack so atmospheric pollution is low.

It is fairly obvious that the world will have to continue to use its coal reserves for producing primary energy - more so with declining petroleum reserves. Coal gasification could be one technique that greatly improves the utilisation of what is generally considered to be a dirty polluting fuel.

As coal fields are exploited, the most valuable grades are consumed first. Coal gasification allows the exploitation of the remaining poorer grades.

The natural gas can be added into the existing pipeline distribution network or can be used at the plant in a combined cycle gas turbine power plant. So the energy in the coal can be exported either as electricity or as methane.

If the coal gasification process runs continuously, the methane can fuel CCGT power plant at times of peak power demand, or compressed and stored at times of low power demand. So by storing the energy in the form of methane it allows you to meet the changing demands put on the power plant. Extra CCGT generators could be spooled up quickly using the stored methane when needed.

By locating these gasification plants close to the coalfields - coal transport costs could be reduced. Energy exported in the form of electricity - possibly using a new HVDC supergrid, would be in great demand during summer months for air conditioning, whilst in winter months, natural gas for home heating may be more appropriate. Either way there is flexability to tailor the exports to meet the changing demands.

Coal gasification is a scaleable technology. Plants could be designed to suit the output of the local coal fields and the demands of the population.

The ND plant uses nearly 6 million tons of lignite per year and from this produces 54 billion cubic feet of natural gas per year - enough to power a CCGT power plant of between 800MW and 1GW.

Labels:

Coal was traditionally gasified to make lighting gas and for running gas engines. With improved pipelines, natural gas began to become popular in the 1940s in the US and so manufacturing gas from coal fell almost into obscurity.

In the 1980s a coal gasification plant was built in North Dakota, with the purpose of converting the local brown coal into high purity methane that could be used for domestic and industrial heating in the local community.

At the time it was built, oil was cheap and so the economics didn't quite work out.

However, one of the by-products of the gasification was large volumes of pure CO2, and a pipeline was built to run 205 miles north up into Sascatchewan, so that the CO2 could be used to pressurise an oil field and get another 20 years of production from the declining field.

The process is detailed here:

http://www.dakotagas.com/Companyinfo/Gasification_Process.html

Coal gasification will likely become a viable energy conversion technology and it has the following advantages:

1. It converts low calorific value brown coal into high energy natural gas that is easier to transport and use.
2. The by-products are easily separated from the process and have commercial value for fertilisers and phenol feedstocks.
3. The CO2 is captured and can be sequestered in oil wells allowing extended production
4. Waste products - toxic metals etc are separated from the mix and can be appropriately handled
5. There is no requirement for an exhaust stack so atmospheric pollution is low.

It is fairly obvious that the world will have to continue to use its coal reserves for producing primary energy - more so with declining petroleum reserves. Coal gasification could be one technique that greatly improves the utilisation of what is generally considered to be a dirty polluting fuel.

As coal fields are exploited, the most valuable grades are consumed first. Coal gasification allows the exploitation of the remaining poorer grades.

The natural gas can be added into the existing pipeline distribution network or can be used at the plant in a combined cycle gas turbine power plant. So the energy in the coal can be exported either as electricity or as methane.

If the coal gasification process runs continuously, the methane can fuel CCGT power plant at times of peak power demand, or compressed and stored at times of low power demand. So by storing the energy in the form of methane it allows you to meet the changing demands put on the power plant. Extra CCGT generators could be spooled up quickly using the stored methane when needed.

By locating these gasification plants close to the coalfields - coal transport costs could be reduced. Energy exported in the form of electricity - possibly using a new HVDC supergrid, would be in great demand during summer months for air conditioning, whilst in winter months, natural gas for home heating may be more appropriate. Either way there is flexability to tailor the exports to meet the changing demands.

Coal gasification is a scaleable technology. Plants could be designed to suit the output of the local coal fields and the demands of the population.

The ND plant uses nearly 6 million tons of lignite per year and from this produces 54 billion cubic feet of natural gas per year - enough to power a CCGT power plant of between 800MW and 1GW.


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These were very nice units for their time. I used a Fortress LI-720
at home (on ~70 Ah of external batteries) to support computer and
telecom equipment for about five years, before converting most loads
to native DC, and it never gave me any trouble.

They do produce a true sinewave, like an APC Smart-UPS, and the
circuit topology is quite similar between both, with multi-tap
buck/boost transformers, etc.

The Fortress takes better care of its batteries than does an APC,
though, keeping them at a proper float voltage most of the time
(following bulk recharge), with occasional, higher-voltage
"equalizing" cycling to keep sulfation at bay.

Also, you can talk to them through a plain-ASCII command prompt on the
serial port, with almost every parameter, including charge voltages
being adjustable.

See

http://www.networkupstools.org/protocols/fortress/page6.html

http://www.networkupstools.org/protocols/fortress/page5.html

(and so on back to 'page1.html'). There were several varieties of
Fortress sold, and parameters can vary a bit.

Note that most of the settings marked Change Not Allowed *can* be
adjusted, but you need to supply the "Factory" password to do so.

This is 18473 for every Best Power UPS I've worked with (including
the Fortress, FerrUPS, and others). Enter

pw 18473

and its command prompt should change to "Fact =>".

Yup, that's a big drawback to nearly all UPSes of this type, with the
more sophisticated "line interactive" models (Fortress, SmartUPS)
being worse than the simple & cheap ones.

My 720VA Fortress also drew about 22W from the grid whenever it was
plugged in and "on", even with no load and fully charged batteries.

Labels:


What I am trying to do is shred a few limbs from
time to time. I have used it and if I was cautious with the feed speed, it
worked fine.

If we were going to feed 6" logs rapidly into several saws, you are correct
that we would need a lot of power. To avoid bogging the saws, we will have
to control how fast the branch feeds into the saws.

You are correct that we must align the table so that all of the contact of
the branch into the saw is at the middle or above. I have had no trouble
with it kicking back. Still, I think standing to the side, so that your
body is not in front of the blades, is a good idea.

One tooth will not stop us. Two or more together will and you are correct,
it will be a pain to disassemble the stack.

http://www.directindustry.com/prod/maquinas-pinheiro/automatic-multi-blade-rip-saw-21872-50641.html

 That is a multi-blade rip saw and it has a 100 hp motor. There is also
 the problem of feeding. A ten inch blade with a one inch arbor and
 washers is only going to give you a feed capacity of 3 inches or so.
 Then how do you keep the blades from quickly grabbing the wood and
 binding up? If you have the blades cutting so they pull the wood they
 are just going to grab on and stall the motor. If you have the blades
 so they push the wood they are going to spit whatever you put in there
 right back at you.

 I have also had carbide teeth come right off saw blades from feeding too
 fast and hitting a knot or nail. It would be a real pain to have to
 take apart the whole blade stack and replace a blade every time a tooth
 comes off.

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_Researchers: Water-splitting discovery is giant leap for solar energy  storage_
(http://web.hermesemessenger2.com/tfg/public/Update_Links.asp?EmailAddress=CAVM@AOL.COM&ScheduleID=1215&IssueID=297&FileName=http://web.hermesemessenger
2.com/tfg/public/newsletters/present/ISSUE297/article910.html&ArticleID=910)

A recently developed process that splits water into hydrogen and oxygen
gases using the sun's energy could one day efficiently store solar power—and
this could soon transform solar power from an alternative to a mainstream
energy source, Massachusetts Institute of Technology (MIT) researchers said last
week.

Inspired by plant photosynthesis, the process developed by MIT Professor of
Energy Daniel Nocera and postdoctoral fellow Matthew Kanan uses two
catalysts, one that produces oxygen from water, and the other, hydrogen. The oxygen
and hydrogen may be recombined inside a fuel cell for carbon-free electricity,
the researchers said.

The oxygen-producing catalyst—a new discovery—consists of cobalt metal,
phosphate, and an electrode, placed in water. Electricity running through the
electrode causes the cobalt and phosphate to form a thin film on the
electrodes and form oxygen gas. Combined with a hydrogen-producing catalyst—such as
platinum—the system can duplicate the water-splitting reaction in
photosynthesis.

Nocera said in an MIT _news release_
(
http://web.hermesemessenger2.com/tfg/public/UsageTracker/usage_tracker.asp?targeturl=http://web.mit.edu/newsoffice/20
08/oxygen-0731.html&issueid=297&EmailAddress=CAVM@AOL.COM)

that more engineering work is required to integrate the discovery into
existing photovoltaic systems. "The new catalyst works at room temperature, in
neutral pH water, and it's easy to set up," he said. "That's why I know this
is going to work. It's so easy to implement."

Industrial processes to split water with electricity are currently in use,
but they use electrolyzers that are not suited for artificial photosynthesis
as they are costly and require a non-benign environment, the release said.

This process, in contrast, uses nothing but abundant, nontoxic natural
materials. In one hour, enough sunlight strikes Earth to provide the entire planet
's energy needs for one year, Nocera said.

"This is the nirvana of what we've been talking about for years," he said. "
Solar power has always been a limited, far-off solution. Now we can
seriously think about solar power as unlimited and soon."

Source: MIT

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I have 3 Best Fortress 950 kva UPS units I picked up surplus over 10
years ago. All date codes I can find on them show they were made in
1992. One unit is still operating on it's original batteries! I
haven't done a long duration load test but I'm sure it wouldn't last
long with batteries that old. It does a good job of keeping a computer
from shutting down on short duration power hits.

The other two units I have running on external batteries I picked up
surplus. Originally these units had four 6 volt 12 amp hour batteries.
One of these I have modified for external batteries and is running on
two 93 amp hour 12 volt Dynasty batteries in series. This unit powers a
server, emergency lighting and security cameras in a small business. A
long duration load test was done unintentionally on this unit. A
commercial power hit caused by a nearby lightning strike tripped the
ground fault breaker the ups was connected to. Our alarm system ac
power fail circuit was connected to a different circuit breaker than the
ups so we didn't get a power fail notification. That has been
corrected. This just happen to occur on a Friday evening so the ups ran
until it shut down on low voltage approximately 12 hours later.

These units have a built in fan and will power on without ac connected.
I have used the unit which has it's original batteries for powering
radio test equipment while in the field and mobile. I haven't viewed
output wave form from these units but I'm fairly sure they don't
provide a true sine wave output. However so far these units have
powered everything I've needed them to. Even an old HP Laser Jet printer.

I just checked the no load battery current drain on one unit and found
it to be 1.45 amps with the batteries at 13.72 volts each. So the idle
battery drain is very close to 40 watts. That's with the fan running
because the fan comes on as soon as the inverter starts.

Labels:

It would appear that the efficiency gains come NOT from the actual BTU's of hydrogen that you are adding, but from the effect that the hydrogen has on how the main fuel charge burns.

From http://www.hydrofuelsolutions.com/Go..._releases.html

...a Hydrogen Generating System (HGS) for trucks or cars has been on the market for some time. Mounted on a vehicle, it feeds small amounts of hydrogen and oxygen into the engine's air intake. Its makers claim savings in fuel, reduced noxious and greenhouse gases and increased power. The auto industry is not devoid of hoaxes and as engineers are sceptics by training, it is no surprise that a few of them say the idea won't work. Such opinions, from engineers can't be dismissed without explaining why I think these Hydrogen Generating Systems do work and are not just another hoax. The 2nd law of thermodynamics is a likely source of those doubts. Meaning ...the law -would lead you to believe that it will certainly take more power to produce this hydrogen than can be regained by burning it in the engine. i.e. the resulting energy balance should be negative. If the aim is to create hydrogen by electrolysis to be burned as a fuel, the concept is ridiculous. On the other hand, if hydrogen, shortens the burn time of the main fuel-air mix, putting more pressure on the piston through a longer effective power stroke, and in doing so takes more work out, then this system does make sense. Does it work? Independent studies, at different universities, using various fuels, have shown that flame speeds increase when small amounts of hydrogen are added to air-fuel mixes.

The results of tests at Corrections Canada's, Bowden Alberta Institution and other independent tests reinforce the belief that combustion is significantly accelerated. They found with the HGS on, unburned hydrocarbons, CO and NO, in the exhaust were either eliminated or drastically reduced and at the same R.P.M. the engine produced more torque from less fuel.

Recently I took part in the highway test of a vehicle driven twice over the same 200-kilometre course, on cruise control, at the same speed, once with the system off and once with it on. A temperature sensor from an accurate pyrometer kit had been inserted directly into the exhaust manifold, to eliminate thermal distortion from the catalytic converter. On average, the exhaust manifold temperature was 65°F lower during the second trip when the Hydrogen Generating System was switched on. The fuel consumption with the unit off was 5.13253 km/li. and 7.2481 km/li. with it on, giving a mileage increase of 41.2% and a fuel savings attributable to the unit of 29.18%

>From the forgoing, the near absence of carbon monoxide and unburnt hydrocarbons confirms a very complete and much faster burn. Cooler exhaust temperatures show that more work is taken out during the power stroke. More torque from less fuel at the same R.P.M. verifies that higher pressure from a faster burn, acting through a longer effective power stroke, produces more torque and thus more work from less fuel. The considerable reduction in nitrous oxides (NOx} was a surprise. I had assumed that the extreme temperatures from such a rapid intense burn would produce more NO.,. Time plus high temperature are both essential for nitrous oxides to form. As the extreme burn temperatures are of such short duration and temperature through the remainder of the power stroke and the entire exhaust stroke, will, on average, be much cooler. With this in mind, it is not so surprising that less NOx is produced when the HGS is operating.

An engineering classmate suggested a grass fire as a useful analogy to understand combustion within an engine. The flame front of a grass fire is distinct and its speed depends in part on the closeness of the individual blades. If grass is first sprayed with a small amount of gasoline to initiate combustion, then all blades will ignite almost in unison. In much the same way, small amounts of nascent oxygen and hydrogen present in the fuel-air mix will cause a chain reaction that ignites all the primary fuel molecules simultaneously. Faster more complete burns are the keys to improving efficiency in internal combustion engines. Power gained from increased thermal efficiency, less the power to the electrolysis unit, is the measure of real gain or loss. It follows from the foregoing paragraph that even a modest gain in thermal efficiency will be greater than the power used by an electrolysis unit. The net result should therefore be positive. Thus onboard electrolysis systems supplying hydrogen and oxygen to internal combustion engines, fuelled by diesel, gasoline or propane, should substantially increase efficiencies.

Mixing hydrogen with hydrocarbon fuels provides combustion stimulation by increasing the rate of molecular-cracking processes in which large hydrocarbons are broken into smaller fragments. Expediting production of smaller molecular fragments is beneficial in increasing the surface-to-volume ratio and consequent exposure to oxygen for completion of the combustion process. Relatively small amount of hydrogen can dramatically increase horsepower and reduce emissions of atmospheric pollutants.

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This to me seems like a ummm, well not all that efficient.

UI wonder what the cost vs horsepower return rate is, we have three
powers running here

Yes they get power from the engines alternator. That is NOT free power
and far from efficient generation of the power, I wonder what the power
use is, and how much fuel ity's using to make said power,

and if it uses "Distilled Water" where did it come from, and how much
power was used to make it, transport it, and how much is used dragging
it along?

I fail to see how this is a total net positive energy use. when you
factor in all the different power sources used to make it work.

>Truckers Choose Hydrogen Power
>
>
http://www.wired.com/cars/energy/news/2005/11/69529
>Hundreds of semitrailer trucks zipping along North American highways are now powered in part by hydrogen. These 18-wheelers make hydrogen as they go, eliminating the need for high-pressure, cryogenic storage tanks or hydrogen filling stations, which, by the way, don't yet exist.
>
>These truckers aren't just do-gooders. They like Canadian Hydrogen Energy's Hydrogen Fuel Injection, or HFI, system because it lets them save fuel, get more horsepower and, as a bonus, cause less pollution.
>
>"We're saving $700 a month per truck on fuel," said Sherwin Fast, president of Great Plains Trucking in Salina, Kansas. The company tried the HFI system on four trucks and has ordered 25 more.
>
>"Drivers like the increased power and noticed there is a lot less black smoke coming out of the stacks," said Fast.
>
>HFI is a bolt-on, aftermarket part that injects small amounts of hydrogen into the engine air intake, said Canadian Hydrogen Energy's Steve Gilchrist. Fuel efficiency and horsepower are improved because hydrogen burns faster and hotter than diesel, dramatically boosting combustion efficiency.
>
>"You get more work from the same amount of fuel," said Gilchrist.
>
>This is not a new idea. The Jet Propulsion Laboratory at the California Institute of Technology published research on the uses of hydrogen as a combustion-enhancing agent in the early 1970s. But the ability to make hydrogen on the go is novel.
>
>The sticking point for hydrogen has always been getting it. Unlike crude oil, natural gas, wind or solar energy, hydrogen doesn't exist freely in nature. It costs $5 a gallon to make hydrogen from natural gas.
>
>But the HFI system uses electricity from an engine's alternator to power the electrolysis of water to produce hydrogen as needed from small amounts of distilled water.
>
>"That's a big advantage and a bit of a novelty," said Venki Raman, an expert on hydrogen-energy applications who started Protium Energy Technologies.
>
>HFI's manufacturer guarantees 10 percent fuel savings, which likely won't interest car companies or consumers, Raman said. But a reduction of pollution emissions could spur broader use.
>
>Trucks with the HFI system produce half the amount of particulates -- microscopic, unburned bits of diesel. The system also reduces nitrogen-oxide emissions, which are major contributors to harmful air pollution, by up to 14 percent, according to Canada's Environmental Technology Verification Program.
>
>The HFI units are relatively small and cost between $4,000 and $14,000, depending on the size of the vehicle.
>
>"It looks like a good transition technology to hydrogen fuel cells, which are still at least 15 years away from commercialization," said Raman.
>
>It will take at least until 2040 before fuel cells begin to reduce greenhouse gas emissions, according to the National Hydrogen Association, Gilchrist pointed out.
>
>"We vehemently disagree with governments picking the fuel cell as the single path to a cleaner environment," he said.
>
>Gilchrist recently argued just this point in meetings with California officials, who are considering buying prototype fuel-cell vehicles that will cost more than $1 million each. That money could buy many HFI systems, which would provide "300 times" the air-pollution reductions of one fuel-cell vehicle, he said

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Before going off-grid, you have to understand and rationalise your electricity usage.

 

Identify the large loads, the times of usage and how essential they are. If it's mid winter and the battery bank is flat and the 'oid needs some maintenance before it will start - will that be a major problem? Would you have a backup for that eventuality?

 

The bottom line is that a Listeroid will use about a litre of fuel to produce a kWh of electricity.  Some do better than this,  perhaps 1.5kWh per litre or even 2kWh - but that is exceptional and not the norm.

 

So you have to ask yourself whether you want to translate a 900kWh per month electricity bill, into what would potentially be a  160 US gallon per month fuel bill  (assuming 1.5kWh per litre).

 

Whist you can run the Lister on veg oil,  used motor oil or HHO with extra lubricant added,  you need to appreciate that the 10/1 could be consuming about 5 or 6 gallons per day.

 

The 10/1 'oid should produce about 10kW of recoverable heat for your CHP system.  From my experiments here with exhaust gas heat extraction and from the coolant, I found that 1kW per horsepower is a good rule of thumb.  This is approximately 1/3rd of what your 97 k BTU/hr  heating system currently produces.  However you will find that you seldom use the full output of your furnace, and you may find that the heat losses from your house in winter are within the capability of a 10kW CHP system.  Heat storage in a thermal store might be one way of getting around heat output intermittency.

 

You also have to look at your peak electrical load, before you design your battery bank and inverter system.  You should get about 5kW power from the 10/1, and you might have to run your larger appliances in sequence rather than all together.

 

Last winter I would start the Lister after breakfast, then start the dishwasher, and once it had completed its cycle start the washing machine.  These are all the sort of compromises you need to make when you want to go off grid.

 

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Their advertised "limitations" of conventional mills, tho, is misleading
- noise, vibration, bird kill? Noise is caused by vibration that is
overcome by proper balancing and maintenance of the equipment. I've been
by many a mill and not heard hardly a thing. I guarantee you - soon as
some bird-crap builds up on this thing, it's going to vibrate and rattle
like mad. Bird-kill? Show me dead birds from conventional mills. Can't?
Probably because it's very rare and more birds are killed by cars and
windows and snot-nosed brats with bb-guns than all the mills combined.
Axial flux mills don't cut out at high speeds either - they fold to
reduce their wind-exposure but then they just keep on spinning so
there's no loss of power. 40-watts at 28mph winds? Where do you find
constant 28mph winds? Especially near ground level that they seem to be
preferring? And 40-watts will barely start up a couple of CFL's. No
high-elevation mounting towers? What, they take advantage of red-neck
farts at ground level? All the good wind is up there. Below the
tree-line and roof-line you have too much disturbance for any of the
wind to be useful. Can be mounted on top of buildings? Sure - turn your
house into a resonator. "Almost no vibration" doesn't mean "no
vibration" and that thing will make your house sing. So far this
particular item is vaporware and I hope it stays that way. It's been
demonstrated that vertical mills simply do not harness appreciable
percentages of power from the wind in comparison to conventional mills.
Stick with what works.

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Look for the APC Smart UPS from the XL series if you can get them.
They are the same, but have an extra connector on the back for
external batteries, and you can tell the UPS how many batteries you
have connected. I believe they are 24v for 1500VA and under and 48v
for the 2200VA and larger.

I have a SmartUPS 750XL that I bought of eBay for the grand sum of £2
(yep two quid!) because it had no batteries installed. I didn't care
because I was going to add a large external bank anyway. I have 4 CSB
battery 12v 75ah batteries connected giving me 3.6kWh of energy if
required, though if you are planning on batteries being cycled often,
as would be the case in a renewable energy or CHP situation, I would
not allow batteries to be discharged more than 25% otherwise the life
time of your battery bank will be shortened.

As a test to ensure that the UPS worked as expected and to gauge the
run times of the batteries, I rigged up a 300w lighting load to the
UPS and left it going. It had done 8 hours by the time I decided that
it was time for bed, so I switched it off happy to know that it far
exceeds my requirements.

So far it has been used in power cuts and quite happily runs the
central heating boiler, house lighting (mostly energy saving CFLs) and
the TV/Sky box - so pretty much business as usual for us in case of
power cuts.

As others have mentioned, the Smart UPS is pure sine wave, whilst the
BackUPS is modified sinewave. Don't use BackUPS for anything with
Motors, nor CFLs - they may work, but at reduced efficiency and
reduced life span.

The Smart UPS series are line interactive which means they power the
load from the mains when it is with in voltage and frequency
specifications, and switch to battery when outside of specifications.
If you power the UPS from a mains generator you may find that it keeps
switching to battery instead of powering the load directly. An online
UPS may be able to cope with generators better as they rectify and
invert the mains feed, but they are more costly and slightly less
efficient. You will not have a problem running the SmartUPS from a DC
power source coupled to a Lister and connected directly to the battery
bank as the UPS can not tell the difference, and the batteries will
smooth the wave form.


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How I home-built an electricity producing Wind turbine
It was easy. You can do it too

Several years ago I bought some remote property in Arizona. I am an astronomer and wanted a place to practice my hobby far away from the sky-wrecking light pollution found near cities of any real size. I found a great piece of property. The problem is, it's so remote that there is no electric service available. That's not really a problem. No electricity equals no light pollution. However, it would be nice to have at least a little electricity, since so much of life in the 21st century is dependant on it.

One thing I noticed right away about my property is that most of the time, the wind is blowing. Almost from the moment I bought it, I had the idea of putting up a wind turbine and making some electricity, and later adding some solar panels. This is the story of how I did it. Not with an expensive, store-bought turbine, but with a home-built one that cost hardly anything. If you have some fabricating skills and some electronic know-how, you can build one too.

Let me state up front that I probably won't be able to help you out much if you decide to build your own wind turbine. This web site has become insanely popular, often taxing the bandwidth limits of the server. I get dozens of requests for help each day. I simply don't have time to answer the majority of them. Simple questions which only require a quick and simple answer may get replies if time permits. However, there is no way I can help you out with complex issues, teach you electronics theory, help you locate parts, build a charge controller for you, or custom design a system for you. There just aren't enough hours in the day. Sorry.

I started by Googling for information on home-built wind turbines. There are a lot of them out there in an amazing variety of designs and complexities. All of them had five things in common though:

1. A generator
2. Blades
3. A mounting that keeps it turned into the wind
4. A tower to get it up into the wind
5. Batteries and an electronic control system

I reduced the project to just five little systems. If attacked one at a time, the project didn't seem too terribly difficult. I decided to start with the generator. My online research showed that a lot of people were building their own generators. That seemed a bit too complicated, at least for a first effort. Others were using surplus permanent magnet DC motors as generators in their projects. This looked like a simpler way to go. So I began looking into what motors were best for the job.

A lot of people seemed to like to use old computer tape drive motors (surplus relics from the days when computers had big reel to reel tape drives). The best apparently are a couple of models of motor made by Ametek. The best motor made by Ametek is a 99 volt DC motor that works great as a generator. Unfortunately, they are almost impossible to locate these days. There are a lot of other Ametek motors around though. A couple of their other models make decent generators and can still be found on places like Ebay . This web site talks about the virtues and vices of various Ametek motors when used as generators.

http://www.tlgwindpower.com/ametek.htm

There are probably lots of other brands and models of permanent magnet DC motors available that will work well as generators. Permanent magnet DC motors work as generators, but they weren't designed to be generators. So they aren't great generators. Some types of motor are a lot worse than others. When used as generators, motors generally have to be driven far faster than their rated speed to produce anything near their rated voltage. So what you are looking for is a motor that is rated for high DC voltage, low rpms and high current. Steer away from low voltage and/or high rpm motors. You want a motor that will put out over 12 Volts at a fairly low rpm, and a useful level of current. So a motor rated for say 325 rpm at 30 Volts when used as a generator, could be expected to produce 12+ volts at some reasonably low rpm. On the other hand, a motor rated at 7200 rpm at 24 volts probably won't produce 12+ volts as a generator until it is spinning many thousands of rpm, which is way too fast for a wind turbine. So shop for motors accordingly.


eBay Marketplace Logo
Permanent Magnet Motors For Sale on Ebay Now!

Product Price Bids Time Left
Pair Electro-Craft Permanent Magnet Servo Motor-Tach $19.99 1 6h 07m
Dayton 2M170D Permanent Magnet DC Motor New $60.08 9 6h 10m
Electro-Craft Permanent Magnet Motor Model E772 Servo $19.99 - 6h 13m
Indiana 7" Permanent Magnet Motor Wind Generator 50V 5A $29.99 1 6h 17m
ENERGY_INFO_15HP_PERMANENT_MAGNET_MOTOR_$1.00_SHIPPING! $9.99 11h 49m
DC 130v 2 1/2 hp Permanent Magnet MOTOR, WIND GENERATOR $29.99 1 12h 26m
NEW Permanent Magnet Motor Technology 9780824707392 $239.35 1d 01h 56m
LESSON DIRECT CURRENT PERMANENT MAGNET ELECTRIC MOTOR $9.99 1 1d 02h 55m
24-48 volt DC Ace Etek Motor, permanent magnet brushed $127.51 2 1d 03h 04m
Dayton Permanent Magnet DC Motor 2M169 $9.99 1 1d 08h 58m
AMETEK 7" Permanent Magnet DC Motor Generator 50VDC $76.00 5 1d 09h 47m
Electro-Craft Permanent Magnet Servo Motor-Tach $19.99 1 1d 09h 47m


View all 42 items on eBay disclaimer



A DC motor to be used as a generator in a wind turbine I managed to score one of the good 30 volt Ametek motors off of Ebay for only $26. They don't go that cheap these days. People are catching on to the fact that they make great wind generators. Other brands will work, so don't fret about the price Ameteks are going for. Shop wisely. Anyway, The motor I got was in good shape and worked great. Even just giving the shaft a quick turn with my fingers would light a 12 volt bulb quite brightly. I gave it a real test by chucking it up in my drill press and connecting it to a dummy load. It works great as a generator, putting out easily a couple hundred Watts with this setup. I knew then that if I could make a decent set of blades to drive it, it would produce plenty of power.

So Blades and a hub to connect them to were the next order of business. More online research ensued. A lot of people made their own blades by carving them out of wood. That looked like an outrageous amount of work to me. I found that other people were making blades by cutting sections out of PVC pipe and shaping them into airfoils. That looked a lot more promising to me. This web site tells you how to make a set of blades for a small wind turbine using PVC pipe.

http://www.yourgreendream.com/diy_pvc_blades.php

Making wind turbine blades from PVC pipe I followed their general recipe. I did things a little differently though. I used black ABS pipe since my local homecenter store just happened to have pre-cut lengths of it. I used 6 inch pipe instead of 4 inch and 24 inches long instead of 19 5/8. I started by quartering a 24 inch long piece of pipe around its circumference and cutting it lengthwise into four pieces. Then I cut out one blade, and used it as a template for cutting out the others. That left me with 4 blades (3 plus one spare).

Finished wind turbine blades made from PVC pipe I then did a little extra smoothing and shaping using my belt sander and palm sander on the cut edges to try to make them into better airfoils. I don't know if it's really much of an improvement, but it didn't seem to hurt, and the blades look really good (if I do say so myself).

A pully and a disk used to make a hub Now I needed a hub to bolt the blades to and attach to the motor. Rummaging around in my workshop, I found a toothed pulley that fit on the motor shaft, but was a little too small in diameter to bolt the blades onto. I also found a scrap disk of Aluminum 5 inches in diameter and ¼ inch thick that I could bolt the blades onto, but wouldn't attach to the motor shaft. The simple solution of course was to bolt these two pieces together to make the hub.

The pully and a disk drilled and tapped Much drilling, tapping and bolting later, I had a hub.

The hub with the blades attached Here it is assembled and with the blades attached (after drilling mounting holes in them of course).

another view of the hub with the blades attached Here is another view of the hub with blades attached.

Hub and PVC vent cap as spinner On a trip to the homecenter store for some PVC doo-dad or other for another project, I found these dome shaped vent caps.

Vent cap in place as spinner I immediately thought of adding a spinner to the hub. Wow, with that on there, it really looks like a professionally made unit. I'd never be able to convince anyone I built it myself out of junk from my workshop and plumbing parts. They'd all look at me when I said I built it myself and go "Yeah, right." Then I found a web site that claimed such spinners disrupt the airflow and hurt the efficiency of the blades. I'm not sure I believe the reasoning behind the claim, but I left the spinner off, at least initially.

Mounting it on a 2 X 4 Next I needed a mounting for the turbine. Keeping it simple, I opted to just strap the motor to a piece of 2 X 4 wood. The correct length of the wood was computed by the highly scientific method of picking the best looking piece of scrap 2 X 4 off my scrap wood pile and going with however long it was. I also cut a piece of 4 inch diameter PVC pipe to make a shield to go over the motor and protect it from the weather. For a tail to keep it turned into the wind, I again just used a piece of heavy sheet Aluminum I happened to have laying around. I was worried that it wouldn't be a big enough tail, but it seems to work just fine. The turbine snaps right around into the wind every time it changes direction. For those of you always clamoring for me to provide plans, blueprints, schematics, etc., for my projects, I have added a few dimensions to the picture. I doubt any of these measurements is critical though.

The completed head of the wind turbine Here is another view of the completed head of the unit with the motor and tail attached.

Attaching a floor flange and 10 inch nipple to the bottom of the head Next I had to begin thinking about some sort of tower and some sort of bearing that would allow the head to freely turn into the wind. I spent a lot of time in my local homecenter stores (Lowes and Home Depot) brainstorming. Finally, I came up with a solution that seems to work well. While brainstorming, I noticed that 1 inch diameter iron pipe is a good slip-fit inside 1 1/4 inch diameter steel EMT electrical conduit. I could use a long piece of 1 1/4 inch conduit as my tower and 1 inch pipe fittings at either end. For the head unit I attached a 1 inch iron floor flange centered 7 1/2 inches back from the generator end of the 2X4, and screwed a 10 inch long iron pipe nipple into it. The nipple would slip into the top of the piece of conduit I'd use as a tower and form a nice bearing. Wires from the generator would pass through a hole drilled in the 2X4 down the center of the pipe/conduit unit and exit at the base of the tower. Brilliant! (if I do say so myself)

The tower base For the tower base, I started by cutting a 2 foot diameter disk out of plywood. I made a U shaped assembly out of 1 inch pipe fittings. In the middle of that assembly I put a 1 1/4 inch Tee. The Tee is free to turn around the 1 inch pipe and forms a hinge that allows me to raise and lower the tower. I then added a close nipple, a 1 1/4 to 1 reducing fitting, and a 12 inch nipple. Later I added a 1 inch Tee between the reducer and the 12 inch nipple so there would be a place for the wires to exit the pipe. This is shown in a photo further down the page. I also later drilled holes in the wooden disk to allow me to use steel stakes to lock it in place on the ground.

The head and base together This photo shows the head and base together. You can begin to see how it will go together. Imagine a 10 foot long piece of steel conduit connecting the two pieces. Since I was building this thing in Florida, but was going to use it in Arizona, I decided to hold off on purchasing the 10 foot piece of conduit until I got to Arizona. That meant the wind turbine would never be fully assembled and not get a proper test until I was ready to put it up in the field. That was a little scary because I wouldn't know if the thing actually worked until I tried it in Arizona.

Bottom view of painted head unit showing counter-weight Next, I painted all the wooden parts with a couple of coats of white latex paint I had leftover from another project. I wanted to protect the wood from the weather. This photo also shows the lead counterweight I added to the left side of the 2X4 under the tail to balance the head.

The finished head unit with blades attached This photo shows the finished head unit with the blades attached. Is that a thing of beauty or what? It almost looks like I know what I'm doing.

I never got a chance to properly test the unit before heading to Arizona. One windy day though, I did take the head outside and hold it high up in the air above my head into the wind just to see if the blades would spin it as well as I had hoped. Spin it they did. In a matter of a few seconds it spun up to a truly scary speed (no load on the generator), and I found myself holding onto a giant, spinning, whirligig of death, with no idea how to put it down without getting myself chopped to bits. Fortunately, I did eventually manage to turn it out of the wind and slow it down to a non-lethal speed. I won't make that mistake again.

Now That I had all the mechanical parts sorted out, it was time to turn toward the electronic end of the project. A wind power system consists of the wind turbine, one or more batteries to store power produced by the turbine, a blocking diode to prevent power from the batteries being wasted spinning the motor/generator, a secondary load to dump power from the turbine into when the batteries are fully charged, and a charge controller to run everything.

There are lots of controllers for solar and wind power systems. Anyplace that sells alternative energy stuff will have them. There are also always lots of them for sale on Ebay . I decided to try building my own though. So it was back to Googling for information on wind turbine charge controllers. I found a lot of information, including some complete schematics, which was quite nice, and made building my own unit very easy. I based my unit on the schematic of the one found on this web site:

http://www.fieldlines.com/story/2004/9/20/0406/27488

That web site goes into a lot of detail about the controller, so I'm only going to talk about it in fairly general terms here. Again, while I followed their general recipe, I did do some things differently. Being an avid electronics tinkerer from an early age, I have a huge stock of electronic components already on hand, so I had to buy very little to complete the controller. I substituted different components for some parts and reworked the circuit a little just so I could use parts I already had on hand. That way I had to buy almost nothing to build the controller. The only part I had to buy was the relay.

Whether you build your own, or buy one, you will need some sort of controller for your wind turbine. The general principal behind the controller is that it monitors the voltage of the battery(s) in your system and either sends power from the turbine into the batteries to recharge them, or dumps the power from the turbine into a secondary load if the batteries are fully charged (to prevent over-charging and destroying the batteries). The schematic and write-up on the above web page does a good job of explaining it.

The charge controller for the wind turbine This is a picture of the controller I built. Click on it to see a larger picture. I just bolted everything to a piece of plywood for testing purposes. Eventually I will mount it in a weather-proof enclosure.

The little perf-board in the lower center with the ICs and other bits on it is the actual controller circuit. The silver bracket below it holds two buttons that allow me to manually toggle the unit between charging batteries and dumping power to a secondary load. The big, black heat sink on the lower left has two 40 Amp blocking diodes bolted into it. I am only using one right now, but I could easily add a second wind turbine or even a photovoltaic solar panel to the system using the second one. The double row of gold rectangles across the top is a dummy load made up of high-Wattage resistors. It has taps at 2 Ohm intervals. I use it as a secondary load to dump power from the turbine into when the battery is fully charged. I also use it for testing purposes to load test the turbine. Eventually excess power from the turbine will be dumped to something more useful like a water heater or a second battery bank. Below and to the left of the dummy load is the main fuse for the wind turbine. The small gray cube is a 40 Amp SPDT automotive relay (the only part I had to purchase) which sends the turbine power either to the batteries or to the dummy load. Along the right side is the terminal block which allows me to connect everything together.

In operation, the wind turbine is connected to the controller. Lines then run from the controller to the battery. All loads are taken directly from the battery. If the battery voltage drops below 11.9 volts, the controller switches the turbine power to charging the battery. If the battery voltage rises to 14 volts, the controller switches to dumping the turbine power into the dummy load. There are trimpots to adjust the voltage levels at which the controller toggles back and forth between the two states. I chose 11.9V for the discharge point and 14V for the fully charged point based on advice from lots of different web sites on the subject of properly charging lead acid batteries. The sites all recommended slightly different voltages. I sort of averaged them and came up with my numbers. When the battery voltage is between 11.9V and 14V, the system can be switched between either charging or dumping. A pair of push buttons allow me to switch between states anytime, for testing purposes. Normally the system runs automatically. When charging the battery, the yellow LED is lit. When the battery is charged and power is being dumped to the the dummy load, the green LED is lit. This gives me some minimal feedback on what is going on with the system. I also use my multimeter to measure both battery voltage, and turbine output voltage. I will probably eventually add either panel meters, or automotive-style voltage and charge/discharge meters to the system. I'll do that once I have it in some sort of enclosure.

I used my variable voltage bench power supply to simulate a battery in various states of charge and discharge to test and tune the controller. I could set the voltage of the power supply to 11.9V and set the trimpot for the low voltage trip point. Then I could crank the voltage up to 14V and set the trimpot for the high voltage trimpot. I had to get it set before I took it into the field because I'd have no way to tune it up out there.

Update: I am now using 14.8V for the full charge point after further researching the proper charging of lead-acid batteries. I have also switched to sealed lead-acid batteries because I got a bunch of them free from my brother. I am contemplating switching to deep-cycle batteries when the ones I have now begin to fail.

Update: I have found out the hard way that it is important with this controller design to connect the battery first, then connect the wind turbine and/or solar panels. If you connect the wind turbine first, the wild voltage swings coming from the turbine won't be smoothed out by the load of the battery, the controller will behave erratically, the relay will click away wildly, and voltage spikes could destroy the ICs. So always connect to the battery(s) first, then connect the wind turbine. Also, make sure you disconnect the wind turbine first when taking the system apart. Disconnect the battery(s) last.

Update: Finally, by very popular demand, I have a schematic of my charge controller. Click on it for the full size schematic. It only varies a little bit from the one at the above link. I substituted a few parts I had on hand for ones in the original design. That way I only had to buy a few things to build the controller. You could do the same. It is not critical to exactly duplicate this design. I used a different op-amp chip and a different MOSFET than the original design. Most of the resistor values are not critical. If you have the knowledge to do so, feel free to substitute. Also, feel free to experiment. I'd be interested in hearing from anyone who feels they have improved on the design in any way.

At last, all parts of the project were complete. It was all done only a week before my vacation arrived. That was cutting it close. I disassembled the turbine and carefully packed the parts and the tools I'd need to assemble it for their trip across the country. Then I once again I drove out to my remote property in Arizona for a week of off-grid relaxation, but this time with hopes of having some actual electricity on the site.

The first order of business was setting up and bracing the tower. After arriving at my property and unloading my van, I drove to the nearest Home Depot (about 60 miles one way) and bought the 10 foot long piece of 1 1/4 inch conduit I needed for the tower. Once I had it, assembly went quickly. I used nylon rope to anchor the pole to four big wooden stakes driven in the ground. Turnbuckles on the lower ends of each guy-line allowed my to plumb up the tower. By releasing the line from either stake in line with the hinge at the base, I could raise and lower the tower easily. Eventually the nylon line and wooden stakes will be replaced with steel stakes and steel cables. For testing though, this arrangement worked fine.

Closeup of how the guy-lines attach to the tower This photo shows a closeup of how the guy-lines attach near the top of the tower. I used chain-link fence brackets as tie points for my guy-lines. The fence brackets don't quite clamp down tightly on the conduit which is smaller in diameter than the fence posts they are normally used with. So there is a steel hose clamp at either end of the stack of brackets to keep them in place.

The tower base with wire exiting This photo shows the base of the tower, staked to the ground, and with the wire from the wind turbine exiting from the Tee below the conduit tower. I used an old orange extension cord with a broken plug to connect between the turbine and the controller. I simply cut both ends off and put on spade lugs. Threading the wire through the tower turned out to be easy. It was a cold morning and the cord was very stiff. I was able to just push it through the length of the conduit tower. on a warmer day I probably would have had to use a fishtape or string line to pull the cord through the conduit. I got lucky.

The head installed on top of the tower This photo shows the turbine head installed on top of the tower. I greased up the pipe on the bottom of the head and slid it into the top of the conduit. It made a great bearing, just as I'd planned. Sometimes I even amaze myself.

Too bad there was nobody around to get an Iwo Jima Flag Raising type picture of me raising the tower up with the head installed.

Now I'm just waiting for the wind to blow. Wouldn't you know it, it was dead calm that morning. It was the first calm day I had ever seen out there. The wind had always been blowing every other time I had been there. Well, nothing to do but wait.

The wind turbine spinning in the wind Finally! The wind was up and the turbine was spinning. The winds were actually unusually light the whole time I was on my property this time. The wind turbine still made good amounts of power though, even with winds that at best made it to only a little over 20 mph at times.

My original messy wiring setup This photo shows the controller, battery and associated electronics all wired up. I have a 120V inverter connected to the battery and a multimeter to keep track of the battery voltage and wind turbine output voltage. Also my electric shaver and battery charger are plugged into the inverter and running off of 120V AC. Later I plugged a long extension cord into the inverter and stretched it back to my camp site. I know this setup is really messy, but I was in a hurry to get up and running to take advantage of the wind once it started blowing. That's my excuse, and I'm sticking to it.

Closeup of the electronics This photo is a closeup of the electronics. The meter shows that the wind turbine is producing 13.32 Volts. My electric shaver and battery charger are providing loads on the system through the AC inverter.

The meter shows 13.49 volts Here the meter shows the turbine producing 13.49 volts. The voltage from the turbine goes up only a little as the wind speed increases once it has a load to power. Once the wind starts blowing, the turbine head snaps around into it and begins spinning up. It spins up quickly until the output voltage exceeds the battery voltage plus the blocking diode drop (around 13.2 volts, depending on the state of the battery charge). it is really running without a load until that point. Once the that voltage is exceeded, the turbine suddenly has a load as it begins dumping power into the battery. Once under load, the rpms only slightly increase as the wind speed increases. More wind means more current into the battery which means more load on the generator. So the system is pretty much self-governing. I saw no signs of over-reving. Of course in storm-force winds, all bets are off. Switching the controller to dump power into the dummy load did a good job of braking the turbine and slowing it way down even in stronger gusts. Actually shorting the turbine output is an even better brake. It brings the turbine to a halt right now, even in strong winds. Shorting the output is how I made the turbine safe to raise and lower, so I wouldn't get sliced and diced by the spinning blades. Warning though, the whole head assembly can still swing around and crack you hard on the noggin if the wind changes direction while you are working on these things. So be careful out there.

The controller electronics all wired up Eventually I decided my setup was too messy and dangerous. Having high current electrical connections and a rat's nest of wires on an Aluminum table wasn't smart. The danger of a spectacular short circuit was too high, so I neatened things up. I set all the electronics on a piece of plywood on top of a plastic storage bin and neatened up the wiring. Then I ran a long extension cord from the inverter back to my camp site and plugged all my stuff into it there.

The fully assembled wind turbine Here is a longer view of the complete setup.

My laptop computer powered by the wind turbine How sweet it is! I have electricity! Here I have my laptop computer set up and plugged into the power provided by the inverter, which in turn is powered by the wind turbine. I normally only have about two hours of battery life on my laptop. So I don't get to use it much while I'm camping. It comes in handy though for downloading photos out of my camera when its memory card gets full, making notes on projects like this one, working on the next great American novel, or just watching DVD movies. Now I have no battery life problems, at least as long as the wind blows. Besides the laptop, I can also now recharge all my other battery powered equipment like my cell phone, my camera, my electric shaver, my air mattress pump, etc. Life used to get real primitive on previous camping trips when the batteries in all my electronic stuff ran down.

So how much did all this cost to build? Well, I saved all the receipts for everything I bought related to this project.

Part Origin Cost



Motor/Generator Ebay $26.00
Misc. pipe fittings Homecenter Store $41.49
Pipe for blades Homecenter Store $12.84
Misc hardware Homecenter Store $8.00
Conduit Homecenter Store $19.95
Wood & Aluminum Scrap Pile $0.00
Power Cable Old extension cord $0.00
Rope & Turnbuckles Homecenter Store $18.47
Electronic Parts Already on hand $0.00
Relay Auto Parts Store $13.87
Battery Borrowed from my UPS $0.00
Inverter Already on hand $0.00
Paint Already on hand $0.00



Total
$140.62

Not too bad. I doubt I could buy a commercially made turbine with a comparable power output, plus a commercially made charge controller, plus a commercially made tower for less than $750-$1000.

Future modifications and enhancements I would like to make to the system include:

* Mount the electronics in a weather-proof enclosure.
* Add meters to monitor battery voltage and charge/discharge current.
* Add a tachometer so I know how fast it is spinning.
* Add more batteries to increase reserve storage capacity.
* Add a second wind turbine or solar panels to increase power production.
* Get a higher Wattage inverter.
* Some method to automatically furl or brake the unit in high winds.
* A concrete foundation for the tower.
* A taller tower with steel stakes and steel guy wires.

Most of these modifications won't be made until I am living on the site permanently, or semi-permanently. One modification I am going to work on completing in the next few months before my next trip out there is the weather-proof enclosure and probably adding the meters.

As the project evolves in the future, I'll post updates here.

UPDATE 03/19/07

This web site has become very popular. Thank you all for your interest and encouragement. I am getting tons of email questions from people about all sorts wind power related (and not so related) issues. Many are the same few questions asked over and over again. Unfortunately I simply don't have the time to answer them all. I do try to read them all, but my busy schedule simply doesn't allow enough time to respond to most of them. So don't take it personally if you don't get a response. I'll instead post responses to the most commonly asked questions here as time allows.

Question #1: How do you prevent the power cable coming down the inside of the tower from winding up over time?

Answer: This is by far the most asked question I get from people. The short answer is I don't do anything to prevent it. The cable really doesn't wind up all that badly. The wind is as liable to spin the turbine head around one way as it is the other. So there is no real tendency for the cable to wind up badly. If it does wind up over time, it is no big deal to simply disconnect the wires at the bottom and manually unwind it. I have an idea for a fairly easy to build slip-ring system that would prevent any possibility of winding up the cable. At present though, there is little need to actually try implementing it. Maybe I'll try it out on a future turbine.

Question #2: Can you help me design/build a wind power system that will power my whole home/farm so I can get out from under the thumb of my evil electric utility company?

Answer: The short answer is no. Not just due to time constraints, but also because my system isn't designed to produce enough electricity to power an entire home or farm. My system was just designed to provide a couple of hundred Watts tops in an area where no other electric options were available. I am working on design and construction of other wind turbines and even solar panels to increase my power production beyond the current minimal level. However, even if successful, these new additions would still not power a typical home or farm. My ultimate goal is to have enough power from wind and solar sources to power a small cabin and observatory on my remote property that will only be occupied occasionally and won't have much need for electricity. If you need a bigger system, then you need someone with experience with bigger systems to help you out.

Question #3: What are you working on now?

Answer: As time permits I am reworking the charge controller. It is going to be mounted in a weather-proof case with automotive-style voltage and amp meters installed on it. I have all the parts I need, but time to work on it is lacking. I am also working on a new design for the turbine head that will automatically turn out of the wind if it gets too strong so as to prevent over-speed damage. I have also started work on building a solar panel out of cheaply acquired solar cell seconds (from Ebay ) and commonly available construction materials. Once there is any progress on that project, I'll post it to the web site, but probably in its own section, rather than here on the wind turbine page.

UPDATE 05/17/07

Me setting up the wind turbine Here is a photo of me setting up the wind turbine on my remote property during our May 2007 trip to Arizona. I had left most of the equipment on-site in Arizona. I only brought the turbine head and charge controller back home with me. Everything weathered the winter ok. Just some slight surface rust on parts of the tower base. Everything went back together quickly and worked great.

My popup trailer set up in Arizona I used the wind turbine to power my new popup trailer on my spring vacation. The strong spring winds kept the wind turbine spinning all day every day and most of the nights too while I was in Arizona. The turbine provided enough power for the interior 12V lighting and enough 120V AC at the power outlets to keep my battery charger, electric shaver, and mini vacuum cleaner (camping is messy) all charged up and running. My girlfriend complained about it not having enough power to run her blow-dryer though.

Meter showing 14.5 Volts Here my volt meter is showing the turbine producing 14.5 volts in a stiff wind. Although the wind turbine powered the popup fairly well, I think there is room for improvement. I was powering the popup with 120 Volts AC via my inverter. The popup has its own 120V AC to 12V DC power supply for powering the interior lighting and other 12V accessories. The losses involved in converting power to 120V AC and then back to 12V DC probably heavily contributed to the battery running down fairly quickly a couple of times during periods of light wind. Powering the 12V systems directly from the battery would probably work better. The only downside I see is that the DC voltage won't be regulated and could swing a couple of volts up or down with changes in wind speed. That wouldn't bother most kinds of lighting too much. Other devices could have a problem with it though.

The wind turbine spinning away This photo shows the turbine spinning away and cranking out the power. I haven't had the time to complete the rebuild of the charge controller in a weather-proof enclosure. So this time I just put all the electronics in a plastic bin to protect them from the elements. Good thing too, since it rained several times while we were there this time. The jug of lamp oil is on top of the bin to prevent the wind from ripping the lid off.

UPDATE 01/3/08

I have completed my first home-built solar panel. It will be used in addition to the wind turbine to produce more power on my remote Arizona land.

UPDATE 05/20/08

The new and improved charge controller I have completed the rebuild of the charge controller. It is now in a semi-weatherproof enclosure and I have added a built in voltage meter. I have also added a few new features. The unit now has provisions for power inputs from multiple sources. It also has built-in fused 12V power distribution for three external loads.

The input side of the charge controller This photo shows the inputs to the charge controller. It has provisions for 3 inputs. One for my wind turbine and two for solar panels, though I only have one solar panel complete at this time.

The output side of the charge controller This photo shows the outputs from the charge controller. There are connections to the battery bank(s), dummy load, and three fused external 12V loads.

A look inside the charge controller This photo shows the inside of the charge controller. I basically just transferred everything that I originally had bolted onto the plywood board in the prototype into this box. I added an automotive illuminated voltage gage and fuses for 3 external 12V loads. I used heavy gage wire to try to reduce losses due to wire resistance. Every watt counts when you are living off-grid.

A block diagram of the complete system This is the schematic for the new charge controller. It is pretty much the same as the old one above, except for the addition of the Volt meter and extra fuse blocks for the external loads. Click on it for a larger version.

A block diagram of the complete system This is a block diagram of the whole power system. click on it for a larger version. Note that I only have one solar panel built right now. I just haven't had the time to complete the second one. Please visit my home-built solar panel page.

UPDATE 07/18/08

Wind turbine and solar panel working together Once again I stayed on my remote property during my recent vacation in Arizona. This time I had both my home-built wind turbine and my home-built solar panel with me. Working together, they provided plenty of power for my (admittedly minimal) electricity needs.

My home-built solar panel Here is a close-up of the solar panel. A write-up on how I built it can be found here. I have to move it several times each day to keep it pointed at the sun, but that isn't really a big hardship. Maybe someday I will build a tracking system to automatically keep it aimed at the sun.

The new charge controller in action Here is a photo of the new charge controller unit. The wires on the left side are coming from the wind turbine and solar panel. The wires on the right side are going to the battery bank and dummy load. I cut up an old heavy-duty 100 ft. extension cord to make cables to connect wind turbine and solar panel to the charge controller. The cable to the wind turbine is about 75 feet long and the cable to the solar panel is about 25 feet long. The battery bank I am currently using consists of 11 sealed lead-acid 12V batteries of 8 Amp-Hour capacity connected in parallel. That gives me 88 Amp-Hours of storage capacity, which is plenty for camping. As long as it is sunny and windy, (nearly every day is sunny and windy on my property), the wind turbine and solar panel keep the batteries well charged.

The wind turbine broken after a wind storm Disaster! I went into town to pick up some supplies. While I was gone, a wind storm came up. Winds well in excess of 50 MPH blew through my area. When I returned I found the turbine in this condition. Two blades had snapped off, and the third was cracked, but still attached. The blades broke where the mounting tab met the body of the blade. I knew this was a weak spot and always expected they would break there eventually. I don't know for sure if it was over-speed, or just fatigue from repeated flexing that caused them to break. I suspect fatigue though. I could see the blades flexing in strong winds before they broke. Interestingly though, I found that the battery bank was fully charged. The wind turbine must have generated some serious power in those high winds before it failed.

I knew I could get the wind turbine up and running again if I could just drill new mounting holes in the blades. I had no drill or drill bits with me though. I had to think about it for a while before I figured out how to do it. Then, the spirit of MacGyver came over me, and I knew just how to do it.

Heating up a screwdriver over a charcoal fire I figured out that if I heated my largest Phillips screwdriver over a fire, it would melt a hole in the PVC blades just the right size for the mounting bolts. So I got some charcoal going and started making holes. It's a terrible abuse of a perfectly good screwdriver, but it was an emergency situation after all.

Melting new holes in the blades I used one of the broken mounting tabs as a template to locate where to make the holes in the bases of the blades. Then it was straightforward to just melt through the blades with the screwdriver. It was very quick and easy, and the holes were very clean.

The broken tabs became spacers for re-mounting the blades I then re-mounted the blades on the hub of the turbine. I used the broken mounting tabs as spacers under the blades to prevent them from fouling the heads of the bolts that hold the hub together. The tabless blades are much stronger and less likely to flex in strong winds. I should have done it this way in the beginning. Live and learn.

The repaired wind turbine Here is the turbine all re-assembled and ready to go back up on the tower.

The repaired wind turbine up and running again Here is the wind turbine up and flying again. The loss of two inches of blade length doesn't seem to have adversely impacted the performance of the turbine. It still works great. Not bad for an improvised repair job.


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