Someone did put PV on a gen1 Prius, and a recent article was out for a converted classic VW van with a system.
It just isn't worthwhile for the gains. In order not to be an aerodynamic drag, the panel needs to be installed flat, which reduces its efficiency. The power it generates results in a tiny improvement to hybrid MPG, and there will soon be affordable long range BEVs with 150+ mile ranges. Then, when the car's battery is full, the PV's potential is wasted.
Better to put them on the house where they'll reduce your electric usage, or make you some coin adding power to the grid, whenever the panel can make power
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