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Current photovoltaic cells are fairly inefficient, maximum efficiency is at about 25% with the rest lost as heat. (I know some recent news has researchers playing with gallium nitride and such, and maybe getting closer to 50 -70%, but they're not just around the corner...) Why not stack the electric
solar cells onto a solar heat collector to scavenge the heat? In small sq footage areas (townhouse roofs, condos, etc) one of these combo cells could make solar a good supplemental heat/electrical source.
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Why not? I've often wondered this myself. [+] |
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