Better batteries and
better PV cells are needed. It will happen. Eventually. Still, a solar powered charging station is likely to be more realistic for a good while.
Batteries aside, don't forget the other non-fossil energy sources. And research continues in the PV arena. I recently heard of the development of photo cells which use zero silver
, replacing it with aluminum at 0.3% of the cost. Too bad the article doesn't say a thing about improving efficiency. But at least they're working on the cost.
Maybe a solar panel on the pano roof could trickle feed the battery while providing a cooling shade to the interior. :-)