And you're not getting this: A solar-only car is not feasible. A car powered by (say) house-mounted solar panels is (commuter). But travelling with a solar-only is not. If you're only saying that 100 % electric vehicles are feasible. Well, yes, of course they are. You can use the grid or use house mounted solar panels to charge the thing. All of those are options that are obviously available today.You're not getting my point at all.
I'm positing what's possible today without resorting to extreme engineering & expense, not suggesting that a solar powered Pan-Am trip in a Prius V would be fast or free from serious constraints. Nothing more than that.