When you think of electric vehicles, you probably imagine Tesla’s Supercharger, or gas station-like centers where you go to top off the voltage. There’s another idea, though, that makes a lot of sense: sun energy. AltaDevices, a subsidiary of Hanergy that makes thin, flexible solar panels, is working with Audi to bring the power of solar to your car’s sunroof. The first prototype should be developed by the end of this year.