[turbo6bar]

The a/c in a Prius is probably 15000-30000 btus/hr. The wattage required to turn the compressor is in the 1250-2500 range, based on my knowledge of home HVAC. Expecting the solar cells to operate the A/C system is a real reach. Even with aurel's assumption of 10 m^2 of panels and 10% efficiency, you'd barely have enough energy. In reality, only the roof will have panels (perhaps 1 m^2), so output would be, at best 1/2 HP or 400 watts..

I'm all for energy conservation, but let's get real.