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expatriate | 02-20-2008 07:19 PM
Generating electricity from your wood stove? http://www.hi-z.com/websit13.htm I came across this the other day, never heard of this technology and am amazed at how cheap the parts seem to be if you want to build one yourself. Anyone have any hands on experience with this concept? It could be perfect for my family's pellet stove if it does indeed work. I looked around on here to see if anybody else has mentioned it before, couldn't find any posts. If I'm mistaken and there is a thread somewhere I'd appreciate being pointed in the right direction.

expatriate | 02-20-2008 07:22 PM
Re: Generating electricity from your wood stove? The same company has an example of this "thermoelectric" generator utilizing the waste heat of the engine of a class 8 diesel truck! http://www.hi-z.com/websit07.htm

TechGuy | 02-20-2008 08:34 PM
Re: Generating electricity from your wood stove? Looks like they are using peltier devices to generate the power. You could find these in the surplus market and build yourself. The fans are there to make sure the temp. differential stays there, the 'cold' side of the device needs to stay cool in order to generate the power. Do a search for sterling engines. Much cooler tech!

TechGuy | 02-20-2008 08:37 PM
Re: Generating electricity from your wood stove? http://www.peltier-info.com/info.html here you go. http://www.thsengineering.com/surplus/tec.html

phideaux | 02-20-2008 08:42 PM
Re: Generating electricity from your wood stove? Thanks for the link, interesting info.

expatriate | 02-21-2008 05:48 AM
Re: Generating electricity from your wood stove? Quote:
Originally Posted by TechGuy (Post 976394) http://www.peltier-info.com/info.html here you go. http://www.thsengineering.com/surplus/tec.html
great leads, much appreciated.

TonyG | 02-21-2008 08:35 AM
Re: Generating electricity from your wood stove? Cool stuff, A few weeks ago, one of the posters linked to a free energy site. One of the technologies was by a company attempting to make energy from the warm/cold difference in the depth of lakes and oceans. The 1000 watt tractor trailer muffler is interesting. Make a dual stack exhaust, add a couple extra batteries and a D.C. auxillary motor to drive power steering and air conditioners to remove even more horsepower loss from the engine. Wonder what one of the mufflers would "cell" for?

TheSimpleton | 02-21-2008 12:36 PM
Re: Generating electricity from your wood stove? You may want these: http://www.varmaraf.is/engl/prod.htm http://www.sitechina.com/thermoelectric/Pspec.html http://www.teenergy.fi/index_en.htm They were also a common item on furnaces (sometimes coal) of a certain era. The 12v ran the thermostat without house power. They may still be available through HVAC suppliers. The problem with TE seems to be a few: one, need huge temperature differentials to get adequate power. Of course, if it's close to the furnace, then it's hard to get the ice. If it's outside in the ice, it's hard to get enough heat. Also they can burn up like other semiconductors, so they can't be TOO hot--like under a freznel lens. The power they generate is marginal. If you get a water-based one, like varmaraf, then impure water clogs the fins. You can use them on a woodstove to circulate water for free, but that's all the power they have. A solar panel or thermosiphon would work more reliably at less cost. Some have put them on a kero lantern or bonded into a saucepan (water is fixed temp and insures no meltdown). One plus: all are reversible, which is what most 12v coolers are. They're horribly inefficient compared to compressors, but can heat or cool in the same unit. If you could find one of these junked, it would have the needed parts. Good luck. I haven't found a way to use them compared to a stirling engine (solar hot box or lens) but maybe you will. TS

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