>>Now how does that work? you take your empty car, plug it in at home, charge it, then empty it back into the grid and have a flat car the next morning?
No, you have a partially charged car attached to the grid and tell the charger how full you want the car, and when.
As you know the grid has significant surplus capacity overnight so that's when net charging would occur.
During the day you may wish to allow the grid to take some juice back for the appropriate fee (or not even attach it if the price was too low).
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