Mate i have the "Friday afternoon 80lt".
Its had a new lid, two lots of thermisters, All circuit boards replaced and had
never worked as it should.Wich also after 3 @#% yrs of it they tell me "oh she was over gassed"
wich cause it to freeze up and not run properly
Every time we load it up into the car for a trip she plays up.
Now i just got her back 2 weeks before Xmas and Temp says 30 but shes cold.
??better than normal with gas issue fixed
Repair shop says " could be faulty circuit board" just fitted or thermisters again......
90 amp Battery would last approx 24hrs max.(but she's not normal).
I do have 3 mate with same fridge.... love em, and they work great,thats why we bought ours.
Sorry to deter you and ramble a bit...Good luck.
Cheers Ian
P.s look into 2x 40lt fidges.