An electric mini van powered by Lithium ion Batteries that recharge from solar panels and wind chargers on the roof of it. While the vehicle is in motion, it should charge right? Also Lithium ion Batteries can give you up to 250 – 400 miles per charge. So what would be the potential problems with this and why hasn’t anyone done it yet?

There are plenty of people who have been converting cars to electric running vehicles since the mid 70s 9maybe even before then), and some of them move up to speeds of 80mph.
But what about the idea of the propulsion or stationary position of the vehicle itself doing the charging. It might take some time, but after the initial investment, insurance payments and general maintenance costs re all that would be left. No stops at the gas station, no fluid changes (except transmission). So when is someone going to build it?