Don't get me wrong its an excellent idea overall, and with a few tweeks and a factor of ten price drop will be a lot more viable.
The Tesla 2 is 5K + 5% vat if fitted with solar, retro fitted its +20% vat. Just crunching some ball park figures on the cost without any grid payback the battery and solar (20K) comes out at 400 plus per quarter, over 15 years and then you have to have a dual or full electric car at say 30k plus on top. All 3 have somewhat limited lifespan with decreasing outputs and abilities. The car has a limited range, and some are slow. Ideal for town driving.
Have any of the 3 (solar array, house batteries and electric cars) got a 15 year life?
I don't doubt there are applications, but for most its not viable for various reasons, I can't see usage being 15% of cars.
As I have said previously its pointless unless it can be charged with non nuclear renewable energy.
Where do you dispose of the batteries when they die? Can a lithium battery be recycled ?
Where have all the old electric milk floats gone...to Benny hills battery graveyard in the sky....hahah
Just like all the old electric cars from 100 plus years ago you don't see them doing the L to B run.
LPG is a lot more use.
And I for one will stick to carbs on a Mini, like me, simples.