I also installed a 240 volt water heater. It’s connected to the AC2 out on the Quattro. That way the Quattro will not power the water heater without shore or generator power. Since it’s a 240 volt water heater, it can run off the 240 volt AC2 out without an autotransformer. There is a circuit breaker, it’s on the left side in the photo showing the selector switch. However, I wired in selector switch for the water heater. It switches between the panel and AC2 out, so the water heater could be powered by the Quattro if desired.