I am also getting solar
I am also getting solar panels installed on my roof. It will actually be cheaper than what I am paying now for electricity. For cars it is a harder sell because the sun-facing surface of a car is relatively small, but as Armen correctly points out this is essentially free, renewable power. And many people have shorter trips to make in their daily driving. Plus every extra bit of solar power will help even if it only provides electricity for half your daily driving. It is a harder sell if you were trying to only power your car from built-in Solar panels, but with solar in addition to batteries it is a good combination. If you have a house where you can set up solar panels that are much more cost effective and the solar power runs your home as well. But for car sharing and city use for shorter trips during the day, this setup makes sense.