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Old 10-01-2012, 04:40 PM   #1
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Location: Long Island (Nassau County), NY
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Running Refrigerator on Battery Power

In my 2008 Berkshire there is a 4-6 volt battery bank for the coach. The batteries are about 4 years old and seem to be in good shape. My coach has the 8 cu ft Dometic refrigerator. I was wondering if anyone knew how long the batteries would last running just the refirgerator on 120v power and using the inverter after the refrigerator has reached cooling temperature on shore power and just running on batteries to maintain the cold temperature.
Any help is appreciated.

Tom and Margaret
2014 Berkshire 390bh-60

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Old 10-01-2012, 07:23 PM   #2
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Location: Mechanicsburg - PA
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Is the electrical outlet for your fridge connected to the circuit that is powered by the inverter?

I never checked my 2013, fridge that is, but only the wardrobe slide and bedroom outlets are usable with the inverter.

2013 Berkshire 390BH / 360hp
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Old 10-01-2012, 10:19 PM   #3
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We have a 2012 390BH-60 with a large side-by-side Dometic Frig. Without running the frig in inverter persay ... in propane, one the frig is at temp, I am able to get the better part of a week out of the batteries. Be careful of other phanton draws ... the convection microwave display in particular.

We used out MH almost constantly between spring break and the start of Sept ... bringing it home for only a week or so at a time. When we had the unit at home, we left it loaded both with clothing and food. It would sit on the driveway with no access to 220V power. Unfortunately the parking orientation meant that the unit face westerly in the afternoon ... thereby taking a lot of sun to the frig side of the unit. By openning the awning and unplugging the microwave, I was normally able to get about a week before I would need to run the genset.

Someone please correct me if I am wrong ... but my understanding is that by turning on the inverter, you are allowing the frig to change the ccoling function from propane to electric and thereby dramatically increasing the draw on the batteries. If you leave the inverter off, the cooling is done by burning propane and the only electrical draw by the fric is to run the control board.
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