In the most technical way, you are correct, but I was responding to a comment about the grid not being able to support EVs. My point was it could, but if you were concerned you could get a solar. Solar is, at least in most states, net-metered. Meaning the electricity you produce during the hottest, busiest times of the day goes to the grid. But you are correct, technically the solar wouldn't directly charge the vehicle overnight.
It's obviously different with the addition of wind and solar power, but fossil fuel generation is put into the grid in large blocks essentially. You spin up a turbine, you get so many MWs available whether you use it or not. People tend to think of it like a gasoline engine or similar, where you use more gas you rev up the engine, but that's not the case.
So in many ways, people are encouraged to use power at night because the capacity is there just wasting away. In many cases, a turbine is already spun up to meet the demand, so one more customer using power isn't going to cost the generating company or environment any more.
So in reality, powering EVs at night isn't going to be a significant problem (other than the cost of fuel) until the demand becomes greater than it in the middle of the day in the summer (or freak cold snap).
The way I understand solar, is that you're essentially powering your home with whatever is left over going to the grid that you are paid for. This makes it a little less likely that another turbine will have to be spun up, or that another plant (of whatever kind) will have to created in the future to meet growing need.
Somewhat unrelated, but a lot of people install batteries with their solar system, which cost $7000, give or take, to time shift usage or be fully self-sufficient. A lot of EVs can serve that function when parked in that garage. Not really relevant to conversation, but another cool feature.
Installing a battery is arguably better than solar panels since it theoretically could be used to help even out load throughout the day and night to match capacity. The problem I see with EV batteries used for this is because you would want to power your home via EV when the power is out....which is usually during a storm of some kind when you also need to conserve power to get the hell out of there if gets too rough. Personally, I'd rather have a hybrid with a stock pile of fuel available to power my home than an EV.
