I recently began working at a company that makes mobile solar generators. Although car chargers have not been a big market for us, I was able to convince management to do a photoshoot with a family friend’s beautiful P85. (a great excuse to drive one of my favorite cars up and down Highway 1 between pick-up and drop-off) The trailer itself can pump out 13.5 kw/h of sun juice everyday and stores it in a large 30 kw/h forklift battery so the car can be charged at any hour of the day. Due to the mobile nature of the unit, no permit is required and it can be used to charge your car as soon as it comes off the hitch. For more information visit http://www.mobilesolarpower.net/ms-series/
This is probably a good example why car companies aren’t in a hurry to put solar panels on cars. Just not enough surface area. If that trailer could hold about 10 of those 9x25W panels and had much lighter lithium batteries, we’d be in business.