That’s 100 free miles a week. Sure, most people will need to charge it anyway, but that’s still 100 free miles a week.
But I don’t think it’s a good idea. It would be more efficient to just put the same solar panels in your roof, where they don’t contribute to the car’s weight, don’t force your to park in sunlight instead of indoor parking or garage, and whose output can be used for charging the car OR for anything else as needed.
Yeah, that’s what I said.