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If your goal is to power the car while driving, even 100% efficient solar cells wouldn't be enough, as there simply isn't enough surface area to gather enough energy to power a normal car doing normal driving. If your goal is to leave the car sitting charging in the sun all day, that's a bit more practical, but I believe there aren't yet any production vehicles like that yet: https://en.wikipedia.org/wiki/Solar_car





Solar trees could help for the parking, but I don't know how the economics of that plays out.



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