We've had ours since April and added two additional 12V Deep Cycle batteries and we can go a few days without power and the batteries are still at 12.6 to 12.4V (did a test prior to our Canadian Maritime trip this summer). Our fridge is set at 34 and freezer at 0 and haven't changed those setting.
You need to get the instructions online for the Remote and walk through all the settings to make sure they're set correctly. And as already mentioned, double check all connections to ensure everything is tight.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top