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I have the Residential Samsung refrigerator in our 2017 3721 montana. I monitor around 16 to 18 amp hours per hours at night to maintain the refrigerator. This is using my 3012 Magnum Hybrid inverter. So it is powering the whole Rv at night and has some small ghost draws. So for my conservative calculations I use 20 amp hours per hour to run the refrigerator. Yes my ice make is on also.
I see an additional 10 Amp hours per hour watching TV and LED lights at night. Plus making coffee in the morning and 10 mins microwave. We live in this full time.
I used 20 amp hour x 24 hours of no power to calculate a bare minimum for 480 amp hours for just refrigerator. So I used 30 amp hours for 24 hours for total house living. That is 720 amp hours per hour. Since lithium batteries can be drawn down 80% 900 amp hour battery was what I put in. They weighted in at 250 pounds for the three 300 amp hour batteries.
Note lead acid batteries can only be drawn 45% to 50% without doing damage.
My five 265 watt solar panels can not fully charge my batteries each day so I have a pair of Honda 2000 generators that can top off 500 amp hours in about six hours through the magnum 3012 inverter. So every other to third day I have to top off.
I did keep the small dedicated inverter for the refrigerator and use it like the propane backup for RV refrigerator.
I hope this helps. Safe Travels.
John
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