Does it make sense to have off-grid solar in parking lots to charge cars?
Generally it doesn't make sense (and isn't that green) to have off-grid solar compared to grid-tied solar. However, a new company sells a self-contained solar EV charging station for parking lots which they claim is cheaper than on-grid, because you can just get it delivered in one day with no permits, planning, wiring or construction.
It's true that all those factors are now the biggest element of charging and solar installations.
I examine this in a Forbes.com article at Does it make sense to have off-grid solar in parking lots to charge cars?