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With 40A you could get maybe a 10kW DC fast charger, if you can call that fast. ;) I suppose you could have another battery charged by this system that would then "dump" the energy into a car, but that's expensive. It would also have to be higher voltage than the car's battery.

The Level 2 AC charging standard actually goes up to about 19kW, but many of the on-board vehicle chargers (and, as a result, EVSEs) do not support charging this fast.
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