How long the fridge runs depends on the size of the house battery bank, the outside air temperature, the temp setting of the fridge, how much else is running on the 12 volt house system, etc. If you are using the generator for a while in the evening, I would think that even a modest sized battery would keep the fridge running all night. I don't have an onboard generator, but I have 2 100 amp hour Group 31 batteries. We have had the fridge and a squirrel cage fan (through an inverter) run all night with plenty of reserve.
_________________ Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.
Current boat: '02 FW 268 Vista Previous boat: '95 FW 190 Horizon
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