Hi
The meter you are looking at only gives you a rough guess what's going on with the batteries. It's looking at voltage and that's not an ideal way to do it. There are fancier meter approaches. One way to improve it's guess is to let the batteries "settle" for a half hour after you charge them before you use the meter.
It sounds like you have something more pulling power off the batteries than just the fridge. There are a lot of other things it could be. Guessing that it's this or that isn't very useful.
Generator will not start can cover a lot of issues. When you try to start it, what happens? Absolutely nothing at all is a loose wire. Click and then nothing is something else.....
I know .. not much help. Simple recommendation: once you get it going, run the generator for at least 4 hours *after* it gets to the 80% reading.
Bob
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