Calculating refrigerator AH correctly
So after years of design work, much of which involving numerous threads on this forum, we finally put our off grid solar system together along with all the loads it will be running at our cottage in northern Ontario. The system consists of 6 310 watt Rensola panels(1860 watts total) which get used to fill our 24V 430 AH bank of 8 batteries. The loads that the system is powering are an electric submersible water pump, an electric refrigerator, an electric front load washer and propane dryer, three LED light fixtures and cell phone and laptop charging for 8-10 people.
So far the system has been working great. We reach float at around noon or 1 PM. The lights flicker a bit when the water pump comes on but I think that is due more to the bulb than excessive amps. The thing that worries me is that the charge controller is saying that we are using about 15-20% of our battery storage while in resting mode during the night. Since this is July, which I should state is the only time of year we ever spend at this cottage, the resting mode usually only lasts from 9-10 at night to 6-7 in the morning. So the 15-20% of 430AH or 65-86 AH of use in 8-10 hrs would mean the fridge uses 8-8.5 AH per hour. All the formulas I have used to calculate required AH of battery storage, require at least 2 days of storage. That would be 384-408 AH for the fridge alone. Does this sound like the correct way to go about calculating this?
Powering-20.5 CuFt. Fridge, 1 HP Submersible water pump, UV, Washing Machine, Gas Dryer, Gas Stove, Lights and Receptacles
Off Grid Cottage on lake in Northern Ontario 46˚N