If destroying your roof just to get some sun-sucking solar panels installed isn't your thing, Lumeta's PowerPly could be the solution. The panels use traditional roofing adhesives, that'll be familiar to regular ol' roofers, and save the process from drilling holes and bolts associated with the regular rack systems required to mount solar panels. Right now this process is targeted at commercial projects -- you can watch a pair of guys install 2.25 kilowatts of solar modules onto a California roof after the break -- but hopefully residential applications won't be far behind.
There are several mfg's of flexible solar panels on the market today. PowerFilm is one. The glue on solar panels are more expensive than the others. Also, the ones that I have seen are not as efficient as the "hard" type.
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