If you want to interface the AC system with an inverter, you must do so, in such a way, that the air conditioning, and the water heater,(if it has an
electrical heating element), or the batt charger cannot be inadvertantly connected up to the inverter. You would want a "change-over" type switch, such as a Blue Sea #9009, listed at West Marine, as #5426630, or similar from other sources. A ...