The two devices can coexist in the same breaker panel: the interlock is transfer equipment for a generator inlet, and the EV charger is an ordinary (if large) branch load. The operational rule is the important one. When the house is on the generator, leave the EV breaker off unless the generator and the inlet were explicitly sized for that continuous current — which a typical portable essentials setup is not. A 32-amp charger is 7,680 W at 240 V, already more than a 30-amp inlet (7,200 W) and more than Honda’s entire fridge–furnace–lights essential list.
If you have a large standby generator and an automatic transfer switch, the installer should still decide whether the charger is in the backed-up set. Many automatic systems shed or lock out EVSE during an outage so the machine can cover heat, refrigeration, and wells. A smart charger with a schedule does not replace that decision.
Size the generator with the calculator, manage interlock loads as the overload page describes, and do not treat the car as an essential circuit. Place the generator outdoors, 20 feet from the house, and never backfeed through a receptacle.
This is not a permit calculation, a utility approval, or a substitute for a licensed electrician, HVAC contractor, or the authority having jurisdiction. Panel Headroom is an independent educational site. It is not a utility, a certification body, or a contractor. Electrical and generator work that is done incorrectly can cause fire, shock, or carbon monoxide poisoning. Use the adopted electrical code and manufacturer instructions; pull permits where required.