[flybouy]

16 ga wire is too light, use 14 or 12. When you say "turn everything off" do you turn the breaker for the converter off? Depending on the battery condition the converter can draw a considerable load, look at the breaker for it for the rating. If the outlet only trips when you are not present then I suspect either the battery charger is kicking it off when the fridge is running or someone is plugging something in when you aren't there. Of course, some could be tripping it just to mean as well. I would get a decent extension cord first and eliminate that.