If your electric circuit is 15 amperes and the voltage is 110V, then the GM charger should be around 12 amperes (to avoid the breaker to open).
So, 110V * 12amps = 1320 W-h or 1.32 kW-h
Then, to recharge 8 kW-h, the time needed will be 8000/1320 = 6.06 hours
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