thermal energy to electrical energy

[quin]

help please..


im looking for a circuit or way to convert heat to electrical energy and store it in a baterry,,,specially 12v batteries,,,

 

[FvM]

Thermopiles for very small power levels https://en.wikipedia.org/wiki/Thermopile
Otherwise a steam or stirling engine with a generator.

 

[bobstay]

You can look at a Thermoelectric generator - they work on the peltier principle like some active CPU coolers, only in reverse. You can find them on **broken link removed**, among other places. People have used them to build **broken link removed**.

Note that they need a temperature difference to work, so you will need to find a cold(er) object for the other side, which could just be a heatsink. Don't expect to get a lot of power out of them unless you have a lot of them and something quite hot (like a fire).

You'll almost certainly need some kind of controller / step-up / battery charger circuit between the TEG and your battery.

 

[tpetar]

Yes, like FvM and Bobstay says peltier is good for that.

See this video as example :
https://www.youtube.com/watch?v=SvBeCCjb9ds


By my opinion to this, maybe is bether to collect heat from sun, on building and house roof there is lots of heat. Also each peltier have their max allowed temp.