The excuse that they will all be charged at night and not stress the grid is another pie-in-the-sky fairytale. Mainly because with several million vehicles all demanding massive power at the same time, the “low demand” hours will rapidly become peak hours.
You also seem to think that electricity just happens all by itself as demand increases. Our electrical grid is already out of date, pushed to it's limits and getting older and more tired by the day.
As more and more Coal fired plants are shut down to make room for people like yourself who believe that all we need is Wind and Solar power to keep things moving, you are in for a great disappointment. Your enthusiasm is not what makes this happen. Cold stark reality is still in charge.
Don't bother to spew the “Nuclear Power” option either. That option is dead on the vine and the facts are that it takes over 12 years to even build one and there are not very many new ones in the planning stage these days, with enough capacity to catch up to the proposed demand.