Found this by accident earlier today, I think it's a pretty cool gadget if you have a cabin with no electricity.
All you have to do is put that thing on top of your hot wood-burning stove, and it'll turn the heat into electricity. As long as it's hot, you're able to generate power. Pretty cool.
For example, the 45w model.

They have several models, the bigger ones even require water cooling, which is kind of impressive.
Here are all the other models:
All you have to do is put that thing on top of your hot wood-burning stove, and it'll turn the heat into electricity. As long as it's hot, you're able to generate power. Pretty cool.
For example, the 45w model.
45W TEG for Wood Stoves, Air-Cooled - By Devil Watt
www.tegmart.com

They have several models, the bigger ones even require water cooling, which is kind of impressive.
Here are all the other models:
Thermoelectric Generators for Wood Stoves - TEGmart
www.tegmart.com