12v power Inverter connected to a battery charger running a 500 watt appliance

This is what happens when you run your AC powered appliance connected to a 12v power inverter with a deep cycle marine battery and battery charger connected. This is what I would do if I thought the power was going to go off. This is a true UPS setup. The light you see is a 500 watt halogen load. The inverter is a Harbor Freight 750 watt. The battery is a deep cycle marine.