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Old 07-29-2015, 11:36 PM   #1
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Default Question about powering a compressor fridge

I'm going to be installing a Norcold DE0061 in my conversion. It can run on 120VAC and 12VDC.
My question is if anyone can think of a good reason to supply 120V to the fridge?

I will certainly be running from 12V. If 120V shore is available, it will be charging my batteries via the MS2012's converter. If it isn't available, I would want the fridge running from 12V, not 120V from the MS2012 inverter section. So what circumstances would dictate supplying 120V to the fridge?

Stan
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Old 07-29-2015, 11:45 PM   #2
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Originally Posted by skagitstan View Post
I'm going to be installing a Norcold DE0061 in my conversion. It can run on 120VAC and 12VDC.
My question is if anyone can think of a good reason to supply 120V to the fridge?

I will certainly be running from 12V. If 120V shore is available, it will be charging my batteries via the MS2012's converter. If it isn't available, I would want the fridge running from 12V, not 120V from the MS2012 inverter section. So what circumstances would dictate supplying 120V to the fridge?

Stan
We went through the same questions when we went shopping for our compressor frig. We wound up with Isotherm, but I think all the Danfoss compressor frigs are the same.

What I was told by Isotherm is that the frig is basically a DC input over a fairly wide range, and then that is converted to to run the compressor at the set speed(s). If you plug into 110v it goes through an inverter to get to DC, so it is really not all that needed, as long as you have enough shore charger to cover the 5ish amps of DC that the frig takes.

We bought a DC only and have not had any issues running DC all the time.
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Old 07-29-2015, 11:59 PM   #3
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i have a norcold dc only fridge in my zion and no issues i can think of.

since it's dc i never worry about issues when i turn on the inverter,

it is 5.5 cubic feet it is dc558xx
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Old 07-30-2015, 02:03 AM   #4
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Our 2-door 6.8 cf NovaKool compressor refrigerator/freezer runs only 12V all the time. I guess I don't understand why they make them dual 120V/12V unless they sell them in other situations where 120VAC is the norm and only source.
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Old 07-30-2015, 02:54 AM   #5
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Has anyone asked Norcold or NovaKool why? I mean they make them, so maybe they have a reason to have the option?

Maybe it is as simple as (1) most choose to run them one way or another + (2) less expensive to just make one model that does both.
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Old 07-30-2015, 03:48 AM   #6
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The Novakool model in my B runs only on 12VDC. There is no 120VAC option.
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Old 07-30-2015, 03:59 AM   #7
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The Novakool model in my B runs only on 12VDC. There is no 120VAC option.
I bet if you look behind your unit, you will find an unconnected 120VAC connection. Most of their units seem to ship that way. (It's only a power brick). But, I agree with everybody else. In an RV, running on 120V makes little sense.
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Old 07-30-2015, 04:43 AM   #8
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Maybe, but their own literature says only 24VDC for this model and that is the way it is set up to run in my B. Could be they can run 120VAC but there is no reason to in an RV. Maybe in a tiny home on the electrical grid. Those kind of homes borrow a lot from the RV world. But here, you can look for yourself. This is the back of my refrigerator.

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Old 07-30-2015, 02:50 PM   #9
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I'm going to be installing a Norcold DE0061 in my conversion. It can run on 120VAC and 12VDC.
My question is if anyone can think of a good reason to supply 120V to the fridge?
We have the DE0041 in our Sprinter which is smaller but shares the same electrical components as the DE0061. We were told the reason it's wired into 120VAC shore power before the inverter was to isolate the fridge load from the battery charger section of the inverter. That allows the multi-stage charger to properly detect battery charge state and correctly shift from bulk charge to absorption phase, and then finally to float charge.

However you would definitely NOT want to power the DE0061 from inverter supplied 120VAC. That would entail double conversion loss, first from 12VDC to 120VAC in the inverter and then back again to 12VDC in the DE0061 (yep, the Norcold is 12V native and uses an onboard AC/DC converter when AC powered).
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Old 07-30-2015, 03:48 PM   #10
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Maybe, but their own literature says only 24VDC for this model and that is the way it is set up to run in my B. Could be they can run 120VAC but there is no reason to in an RV. Maybe in a tiny home on the electrical grid. Those kind of homes borrow a lot from the RV world. But here, you can look for yourself. This is the back of my refrigerator.

Edit: 12VDC, not 24VDC.
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