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I think rather than TEGs I would line the back of the panels with some type of water or glycol carrying device. Maybe solid, maybe a bladder that could be attached across the back. This way the panels themselves would become more efficient since the liquid would cool the panels and one would be getting hot water out of the deal at the same time. Seems like I read about someone trying this years ago but I can't recall the outcome. Certainly there would be a few issues to overcome. You'd have to consider the extra weight due to the water and figure out how to handle the ever present possiblity of leaks and of course what to do in the winter for those of you that have that, but I believe this would be a viable use of the back side of PV panels.Maybe I'll play with this next summer.
JJ
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