Where are you camping? I doubt it’s south of the Mason Dixon line. There is no way my fridge would run on that battery for 4 days in Texas heat.Why dose it have to be so complicated
I have been using a ARB 50 QT for the last 6 years, I run it off a dedicated ARB power port wired 30 Amp fuse in my Blue seas fuse panel with the proper size wire.
I run a single group 31 Odyssey Battery.
I'm usually out 3-4 days I have sat in camp running the fridge for up to 2.5 days and the rig has always started !!
I like the KISS plan Keep is simple stupid.
The Battery is now 5 years old now and I was just out with the fridge for 4 day two week ago !!
And no I did not run the numbers, I just know it works !!