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A while back I figured that if I covered the roof of my electric car with mono-crystal panels (higher output per sf) that I could add about a mile of range per day to my battery pack, about 250 watt hours, that should be enough to run day time running lights, ECU, vent fan and everything else for about an hour per day I would think.
My argument of course has always been that PV panels should outlast the vehicle (25 year warranty is standard) Uni-solar... before they went bankrupt had a 25 year warranty, but they also had some of the highest failure rates with a lot of their panels not even lasting 10 years, but assuming that the PV panel lasts 25 year and the average car lasts 8 years why would you put PV panels on the car where they have a reduced output because they are not pointed at the sun, they are at a greater risk of damage, add weight to the vehicle and are more likely to be shaded by trees or buildings.
Put your solar panels on your garage or house where they can point at the sun, get the least shade and just plug your car in when you are home.
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