> "Doesn't this re-introduce the original problem? If less power is available, you have to spend longer charging." Not a realistic concern, at present, because

> "Doesn't this re-introduce the original problem? If less power is available, you have to spend longer charging." Not a realistic concern, at present, because the chances that a large parking lot will be filled with even 10% EVs is small. At any given time, most stalls will be occupied by fossil cars, cars not needing charging, or will just be empty. In the future as demand increases, if you start to hit the limit then you can look at upgrading the electrical supply.