We have a Four Winds 31W with the residential fridge... added 400W of solar, with a total of 5 12W batteries... and have the same experience.... 3 days with a few hours of generator usage. We've also learned to turn off the inverter cutting fridge power when we go to bed, and turning it back on when we get up. I found that the ice stays solid and the ice cream hard even when it's the dead of summer...
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