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I think the issue is that with current photovoltaic technology, you couldn't power a car solely on those, and have it look anything like a car. There was a recent post here about a guy who drove across the U.S. with a completely solar powered car. He had to pull a trailor full of batteries and topped with PV panels. I think short of that, you just can't get enough power to drive anything other than a super aero, non street legal vehicle like the one pictured in the OP.
It will probably just be a matter of time before PV tech evolves enough to power a car shaped car.
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