This is where integrated solar is headed. It goes in with the roof. Roof pitch doesn't matter as much - (the low pitch summer roof can run the air conditioner!)
http://www.residentialarchitect.com/solar-power/solar-integrated-roofing-makes-a-splash.aspx
(http://www.residentialarchitect.com/Images/tmpFABD.tmp_tcm48-619840.jpg) (http://www.residentialarchitect.com/solar-power/solar-integrated-roofing-makes-a-splash.aspx)