Firstly, Professor Green is an awesome chap. He actually taught the semiconductor physics class at UNSW when I was there. It was fascinating the way that he started with solar cells and then went on to topics such as bipolar junction transistors, describing then as "solar cells but with a wire where the sun should be". He inspired my interest in renewable power for decades.
As to solar panels on cars, there are economic and practical things at work here, the core being that for a vehicle like a Tesla, the surface area of the car and energy of the sun mean that you can't actually get a huge amount of power. You are much better off spending the money that your on-car solar setup would need on panels for your house which can then kill two birds with one stone.
The exception to this is for super-efficient vehicles such as those being made by companies like
Lightyear and
Sono motors or for large touring vehicles that can carry more and fancier panels. The latter tends to have larger surface areas and to sit for longer to charge.
If they are really delivering 320 cars a week, pretty sure most of us would have cars by now... 
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