If I were to buy the panels for that purpose, it is questionable if it would be worth it, but I had the panels in my"stuff" pile, so it was only the $15-20 of aluminum and the time.
The down side, how to keep people from swiping my solar panels when I am in the grocery store or mall.
I was thinking of charging the whole car and panel with several thousand volts so you would get a shock if you touched them. I had made a system like that for my camero back in the 70's. People liked to lean on the car. it worked well untill I got someone angry, so they threw a big stone at the car.
Can't win.