They'd also be unhappy with a solar panel that only generated power when a car was plugged in. Fortunately it would still be connected to the grid, resolving both concerns.

Why would I be unhappy? Consider this:

I drive to the mall.

I plug in the slow free charger (maybe ~3500W) as opposed to the paid one at >20000W.

Two hours later I have, say, about 7kWh topped up on my battery.

I now have restored about 40km range, so my 30km drive to and from the mall would be entirely restored.

I'm not sure that's true?

Your car already has the battery built right into it, so a trickle charge for eight hours while you're busy at work might be enough to cover your commute.

2 kW over 8 hours would be enough for 100 km per day.

I drive to work, I park in the parking lot, 8 hours later I leave work. My car is now fully charged.

I would be utterly devastated.