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RE: The Seebeck Effect: How to generate electricity from heat using two coins
Remember that this is based on heat transfer! You could absolutely harvest energy using this thing from the sun, but you would need a way to keep the other end of the device cold so that heat could continuously flow from one side to the other. Perhaps a dark coating on one side and a reflective coating on the other would cause more heat to flow from the dark side to the reflective side?
Let me know if you try it!