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There are temperature effeciency problems with solar. Silicon panels that produce at 14-18% effiency at 22C (72F) lose aound 50% of their output at 65C (150F). That's not an untypical on a US Southwest roof at max air temp (max load need). Cadmium Telleruide at about 7% effceint, and CIGS bounces all over the place.(that's always been the problem of CIGS) They claim to produce more that 12%, but actually see the product is more challenging.
There's lots of other methods in the pipeline, but with the current drop in energy costs, heading to the market has been slowed. Once the economy turns around, energy prices will climb and these will all get relatively cheaper.
Hopefully in 5-10 years we will have 10 year amort conversion....
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