Hope you solve the current issueÖ
Boondocking and using a residential fridge are not normally used in the same sentence. You need to confirm how many amps your fridge uses, times how many days you plan to camp without power and get some more batteries.
Here is some quick math since I donít know what fridge or inverter you have.
Fridge 100 watts 120v
Inverter 2 amps running plus 10 amps for fridge
Furnace 10 amps
Lights, clocks etc 1 amp
I donít know if the fridge is constantly drawing or not but this is a good starting point to do your own calculations. So letís say the fridge cycles on and off and needs power 12 hours a day (120amps), the inverter need power for 24 hours (48amps), the furnace needs power for 4 hours (40amps), and extra parasite draw runs for 24 hours (24amps)
That adds us to 232amps, and you have 200 in your batteries. Your usage will be more or less and these are very rough calculations. Either way you can see you need more batteries for Boondocking more than 24 hours.
2017 Eagle 291RSTS
2017 Chevy Silverado Duramax 2500