Just a few questions, and tips for you that might work...
Are you sure the frig is the problem...? It probably is, but maybe if you haven't already tried this, then it might be worth a shot. Maybe at home do a test, turn the frig off one night, leave TH heat on and anything else you normally keep running all night and see what happens..?
Do you know if the Samsung frig is a 2 compressor model..? Not all, but many Samsung's use a separate compressor for the freezer and another compressor system for the refrigerator section..? Imo, maybe the best system for a house with unlimited power.
Reason I ask, could be a way to minimize power consumption of your frig.
If its 2 compressor model might want to run it all day when on the genny/solar at the coldest setting with the freezer full, but with enough air space for proper circulation. Bottled water is good to add/use if the freezer is not full to capacity. A full freezer will hold its cold much much better than an empty one.
A full freezer at max cold setting all day, should be able to be turned off all night and still maintain a below freezing temp by morning. Keep openings of the frig to a bare minimum, and be quick to close the door(s).
Doing the same to the refrigerator section will also yield good results for 'holding its cold thru the night'. I Don't recommend turning off the refrigerator section all night. But running it all the way max cold all day long under solar/genny power, should get a full box close to 32-34° if you can keep door openings to a bare/fast minimum.
With lots of water bottles and a full frig you should be able to hold a reasonable safe temp by turning the frig thermostat up to 48° before bed or when you turn off the genny.
Doing these things should cause the compressor(s) to cycle a lot less frequently maybe helping lower the load on your battery bank thus making it thru the night and still with enough power to kick over the genny in the morning...
Oh ya, get 2 digital thermometers for the freezer and refrigerator sections to verify the frig is working up to specs.
Also check/verify temps after a night of setting up for 'minimum frig power use'.
A good working frig should get the freezer section to -10-0° after its properly loaded and been running for at least 24 hours. The refrigerator section when properly loaded should be able to maintain 36-32° after 48 hours of use at max cold settings.
Harbor Freight has decent small digital thermometers for about 5$ each. They aren't industrial strength, but fine and accurate enough for a frig troubleshooting venture.
jmo
