It's the fridge set to LP / propane
Or electric
Or DC
Or auto
D.C. mode if only for driving
Are you on an RV park
Or are you plugged into a house someplace
In hot weather with lots of power use it is a good idea to have the fridge on Propane and the water heater on propane
Water heater on electric draws lots of power like the air conditioning or micro wave
Low voltage can cause low charging from the power converter
The power converter keeps the battery charged and runs the 12v stuff
If voltage low and it doesn't charge properly then you run down the batteries
