When I had my EV charger installed in my garage, they also ran 240V wiring back to a Generac neutral switching transfer switch that is wired to my main 200 amp breaker panel for the whole house. When an outage happens, I can plug my truck up to the switch, and the whole house runs from my electric F-150. I've run the house in an outage that only lasted for just over 5 hours and that 5 hours took my battery from 72 percent, to 71. I've been waiting for an outage that lasts longer, just to see how efficient this system works. We love it though.