Originally Posted by Gatormirada
Should the inverter be left on continuously, or just when no other power source is available?
There should be an automatic transfer switch that will switch the fridge over from the inverter to 110 VAC when present. This switchover is virtually instantaneous. As such, once you run the generator or plug in, even if the inverter remains running, the fridge will not be drawing current from the batteries. While the inverter does draw a little current with no load, the converter will be making that up as it charges the batteries. So, if you are going to be hooked up to shore power for a long period you can switch the inverter off. Generally I leave mine on unless I am settled for days.
If I am running the generator to charge the batteries I leave the inverter running.