With a residential fridge, you're going to need at least four batteries and at least 600W of solar. I just upped my solar to 860W this past weekend with room to grow to 1180W. I was testing the system this week under partial cloudy skies and it would operate at about 20-40% of the rated panel capacity. I powered up the inverter and turned the RV fridge to electric. The fridge label says it runs at 600W on electric, but I believe the Res ridge is about 300-400W. I bought the 150V/85A MPPT controller with bluetooth for monitoring. I was watching the panel output and battery voltage and current while firing up the fridge and it dropped to 12.7V from 14.4V rather quick when the panel output was around 230W under mostly cloudy skies. It was dumping over 30A back to the batteries. When the sun peaked out, it jumped to around 575W for a few and it started to climbing back up to 13V. We haven't had blue skies for since last Sunday so I haven't had a chance to get full sun output under load. You have to take into account panel mounting angles (I mounted them flat), battery storage for overnight use and in off-peak conditions (like clouds and shading). Fortunately I run the fridge on propane when boondocking so I should be fine with my system, but I sized the system based on my old trailer and the cloudy days where output is minimal.
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2013 F350 Lariat Ultimate CC LB
2019 3790RD
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