Made a quick rocket stove with bricks. Put a Peltier cooler on the back and got a fire going. Measured the current, volts, and watts produced from a single Peltier cooler. A cooling fan and aluminum heatsink with a 12V portable battery helped.
Video of experiment…
The fuel for the fire was just fallen tree branches that I found on the ground. The portable battery was charged up by a solar panel.
The Peltier cooler rested against one of the bricks. The brick got up to 210 degrees F while the aluminum heat sink was about 70 degrees F. At this temperature difference (140F), the Peltier cooler produced:
The power generated by this Peltier cooler is comparable to the power generated by a small solar panel on a solar landscaping light.
How hot of a temperature can the Peltier cooler get before it breaks down? According to dansdata.com, the max temp of hot side is 80C or 176F. In my experiment, I applied up to 210F to the hot side and did not notice any problem.