Thanks for posting the question! Whole point of the community.
I think we'll see more of this in the future as they continue to make progress on inexpensive "solar paints" and the like. It's not a bad idea, it's just that the tech level doesn't show much bang for the buck...yet.
Also where I live, most cars spend a long time in underground (or at least covered) garages
It would increase the cost and also complicate the manufacturing process.
It would be cool if they were built into the highway and could charge your car as you drive over it. That might make toll roads almost worth it.
The same could be asked with smartphones.
Why don't smartphones include solar panels on the back side of the phone?
We buy solar phone chargers for use in the backyard. They work ok. It would take a long time to fully charge, but it will keep you from going empty.
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