Instructables

Step 2: Get Some Peltier Cells Online

Picture of Get Some Peltier Cells Online
Peltier cells utilize semiconductor technology much like standard solar cells. Two polarized semiconductors convert heat flow into electrical current. Naturally, the greater the heat gradient, the more current is produced. A set of 10 peltier cells can be purchased for $70. Surprisingly, this price is cheaper (since I last checked in 2007) per watt produced than solar cells. Peltier cells are often used in heating and cooling applications because when current is passed through a peltier cell, one side becomes hot, and the other side becomes cold.

It is highly recommended that a cooling element (heat sink) is placed in the opposite side of the peltier cell (the side not touching the Fusion Jr.). This allows for a greater cooling gradient. In some cases, fans or even ice can be used as a coolant to allow for a gradient. Don't let the peltier cells get too hot or they will melt though! 

Placing the cells just right for them to get a maximum heat gradient is optimal. Use aluminum tape to attach the cells.

If you do not wish to use peltier cells, other technology can be used as well such as small steam engines or stirling engines. Both can produce enough power to charge batteries or small appliances.
 
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durrdust2 years ago
Wonderful instructable! I was wondering what operating temperatures your peltier cells are rated for. After browsing some sources online I have found some with maximum temps of ~200 deg C and some that are rated to ~120 deg C. Just wondering if I need to go the extra mile for the hi-temp variants.

Thanks!
krowfarmer3 years ago
It can also be connected to an internal combustion engine, though it may need to be scaled up in size (depending on the size of the engine). Do a search for "Construction of a Simplified Wood Gas Generator for Fueling Internal Combustion Engines in a Petroleum Emergency" for further information. It is a publication from FEMA.