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Old 07-19-2014, 01:59 PM   #1
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Possible AC/DC Fridge Replacement Fit

Looking at potential AC/DC replacement fridges for the Dometic RM8551 4.3CF, which I know many of you have, and which we also planned to add as an upgrade on our 17B.

Thetford really doesn't have an AC/DC model of suitable dimensions and capacity to do a direct replacement.

NovaKool (which is made nearby ETI in East Vancouver) does have two models that might work. The first one pictured below is the NovaKool R4500, which is 4.3 Cubic feet. It's cutouts are about the same as the ones for the Dometic. The second one is the NovaKool R5810, which has a higher capacity of 5.8 Cubic feet. It 'might' work, but it's about 1 1/2" wider than the Dometic RM 8551. In looking at just the photos of the 17B interior, there may not be enough cabinet width to play with.

Both models draw 4.4 Amps at 12V, or 2.2 Amps at 24V, so power consumption is the same. All of this is predicated of course on whether or not you can make that much power to make them practical for boondocking.

The link is the spec sheet showing the dimensions and models for all of the NovaKool fridges. There are some that may work (at least dimension wise) to replace the 6.7 CF Dometic RB 8555 as well.

For those of you who haven't been following the various threads about fridge types, remember that these are AC/DC ONLY -- no Propane involved.

http://www.novakool.com/products/sin...al2013_002.pdf
Attached Images
File Type: jpg NovaKool R4500 ACDC Fridge.jpg (30.7 KB, 4 views)
File Type: jpg NovaKool R5810 ACDC Fridge.jpg (16.5 KB, 175 views)
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Old 07-19-2014, 02:36 PM   #2
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In the interest of science, I think you should try one! Duty cycle is going to be really important for these. I wonder how much they run on an 80 degree day if well insulated when installed. Lots of assumptions to get at a number, but they really might be practical. I assume they transfer the heat out to the outside through an external vent of some sort instead of radiating to the ambient air in the living compartment the way our home fridges do. Wonder how much ambient temperature affects that process.
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Old 07-19-2014, 03:01 PM   #3
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In the interest of science, I think you should try one!
Well that settles it! Far be it from me to hinder scientific discovery.

As for the venting, yes, they would use a similar venting system as their propane counterparts.
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Old 07-19-2014, 03:07 PM   #4
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Quote:
Originally Posted by rbryan4 View Post
Both models draw 4.4 Amps at 12V, or 2.2 Amps at 24V, so power consumption is the same. All of this is predicated of course on whether or not you can make that much power to make them practical for boondocking.
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Yesterday was a bright sunny day in western Ma., my flat mounted 160w panel was putting out 6.5a at high noon. Comes out to 3.86a if it were a 95w, don't know what the max size is for the trailer you are planning on.

Being in Tx I'd expect you to do bigger. I mean better.
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Old 07-19-2014, 03:08 PM   #5
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Being in Tx I'd expect you to do bigger. I mean better.
Sounds like you've been here!...lol

Seriously though, that's the kind of info I need. I'm thinking we prewire for solar, but have the connections terminate on the side of the trailer instead of the roof, and use 2 portable/movable panels we buy afterward.
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Old 07-19-2014, 03:26 PM   #6
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Those 12/120v models do not need any external venting, IMHO. I have had the smaller models in smaller trailers, most are mounted low, below counter tops. About the only heat they create is similar to a microwave, thus a small vent on the side of a cabinet should suffice. They do make some noise while operating, similar to a water pump, a lot more than the propane models.
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Old 07-19-2014, 03:41 PM   #7
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I think you're right Jim, but since the vent would already be there, I assume it would help dissipate any heat from the compressor. As for the noise, I think you're right also, but these newer Danfoss German compressors are much quieter than the ones they put out a few years ago. Noisier than propane to be sure (anything is) but I don't think it'll be a problem for us.
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Old 07-19-2014, 03:45 PM   #8
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Actually you would probably want to close those exterior vents, they let a lot of cold air into the unit that is not needed. Plus I'm not sure ETI will sell a unit without a refer.
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Old 07-19-2014, 03:50 PM   #9
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Actually you would probably want to close those exterior vents, they let a lot of cold air into the unit that is not needed. Plus I'm not sure ETI will sell a unit without a refer.
A good point. Maybe the manufacturer can let me know if any vents are needed. I'm going to try to convince Reace to install the NovaKool instead of the Dometic. Hey, he's done custom faucets, why not a custom fridge --
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Old 07-19-2014, 04:24 PM   #10
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Found this too -- installation instructions from NovaKool. Take a look at page 3 -- ventilation.

http://www.novakool.com/support/docu...ber2007PDF.pdf
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