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Old 11-03-2019, 06:37 PM   #1
MJD
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Inverter

On my 3402 Montana i just installed a new 2000 W inverter and 4 -6 v batteries . Also installed a Victron 702. Great battery monitor and a must with an inverter .Future plan is to replace the Norcold 1200 with a samsung house fridge. What im curious about is those that have an AC fridge what kind of Draw there getting from the compressors. I find running the norcold non compressor fridge draws an insane amount of battery. Ok when driving with truck alternater helping . But without, the battery bank can barely hold 11 v.
I dont need an explanation on the math im just interested in what others are getting for draw on there household fridges so that i can campare b4 buying one. thanks
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Old 11-03-2019, 09:35 PM   #2
Carl n Susan
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Most of use the propane side of the refer when boondocking. The Norcold/Domectic dual mode refers use too much electricity to run it off an inverter.

Here us a discussion about residential refers and their power consumption. Take a close look at John Kohl's experience. It may make you rethink the residential refer.

http://www.montanaowners.com/forums/...ad.php?t=79314
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Old 11-03-2019, 09:40 PM   #3
DQDick
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When we were into boondocking we had seven solar pannels, six golf cart batteries and a 4500 watt inverter. We still never tried to run the frig or the water heater on electric. The micro wave and everything else took all we had, particularly in the winter.
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Old 11-04-2019, 05:05 PM   #4
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We had a MH that had a Whirlpool in it, used about 3 amp with the compressor running.
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Old 11-04-2019, 05:16 PM   #5
MJD
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Thats 3 anps AC. Do u know what the draw on the batteries was.?
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Old 11-04-2019, 05:58 PM   #6
jcurtis934
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Battery draw on most inverters nowadays is more than 10 times the ac draw since they are roughly 90% efficient. So if the fridge draws 3 amps max of 120vac or 360 watts, what you will see off the dc side is 30 amps or 360 watts on 12vdc PLUS that extra 10% for a total of about 33 amps of 12vdc.
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Old 11-04-2019, 06:21 PM   #7
MJD
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Your math is correct. My new almost 500 Amp hr battery bank can deal with that draw overnight. Whats happening with my Norcold 1200 on AC draws my batteries down to 11 V. From my experience in marine installiations u will kill the batteries in short order with that kind of sustained pull.
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Old 11-04-2019, 06:33 PM   #8
MJD
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Forgot to mention my boat batteries can maintain 12v or more with a 20-30 amp pull untill about 50% gone
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Old 11-17-2019, 04:09 PM   #9
jpwhite
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I agree with the other poster, you would be well served manually switching the fridge over to gas when parked.

I don't like having the propane on while driving, from your experience it sounds like installing a 2000W inverter to run the fridge on electric while driving may be a viable solution? I have a single 12 v marine battery.
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Old 11-18-2019, 04:39 PM   #10
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I had the 4-door 2118 model fridge updated to JC Refrigeration Dutch Aire 12 volt system this past summer. Works very well. The specs say it draws 5.5 amps at 12 volts, 67 watts, when the compressor is running. They estimate it's running 56 percent of the time.
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