[glend (Glen)]

I was just reading that Amazon has ordered 100,000 electric Rivian vans for its US delivery fleet, nice sales commission on that. Of course if they are charged by coal fired plants over night, not sure if there is a net benefit, other than to the manufacturer's bottom line.

As Peter has pointed out, people with home based rooftop solar can charge an EV during the day, assuming the car is there to be charged. For retired folk this can work. Certainly my electric bike is charged that way. But if the car is sitting at your work, there is still a very good chance it is not able to be charged or at best would be grid charged (ie not free). Sure it will not produce greenhouse gases during use, and that is a plus. If you need to charge at night then your grid bound most likely.
Many may not need to be charged every day, or night, if you have sufficient battery capacity say due to short distance driving, so if you can run all week with your weekend solar charge that would be ideal. Buying a Tesla Home battery, just to charge a EV at night is pretty expensive.
I can see a need for Smart charging systems, which monitor usage and top up to meet expected demand based on driving patterns. These could potentially extend battery life as well, as all batteries have a limited number of recharge cycles. Smart systems could also 'under charge' the battery, which can double useful lifespan of Li-ion batteries. The worse thing you can do to a Li-ion battery is to charge it everyday, whether it needs it or not. In electric bike studies a battery pack with a 400 cycle lifespan, can be doubled to 800 charge cycles, simply by holding the charges voltage down slightly.