There *are* vehicles powered by on-board solar panels, but they’re impractical for ordinary use. I mean, look at this picture:
https://en.wikipedia.org/wiki/World_Solar_Challenge#/media/File:World_Solar_Challenge_2015-Parade_at_Victoria_Sqare_in_Adelaide,_Australia.JPG
> The 2017 Cruiser class winner, the five-seat *Stella Vie* vehicle, was able to carry an average of 3.4 occupants at an average speed of 69 km/h (43 mph).
https://en.wikipedia.org/wiki/World_Solar_Challenge
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