heck, why limit this technology to just the house roof? make the siding out of it as well! ;) also think about the possibilities for hybrid cars :) make the car roof, hood and trunk out of this :D
heck, why limit this technology to just the house roof? make the siding out of it as well! ;) also think about the possibilities for hybrid cars :) make the car roof, hood and trunk out of this :D Coat roads and highways with this stuff. Make use of all the infrastructure out there. The DOT/states/counties could sell enegry back into grid, pays for road repair and upkeep.
and you could drive around in electric cars that have a "brush" touching the road. Like giant slot racers or "bumper cars". hehehe