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Old 11-01-2017, 10:16   #1
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Dometic Portable vs Installed Refrigeration

Hello,

I have a well-insulated icebox (30lbs of ice kept food cold for 11 days in 85 degree temperatures with a small bit of ice remaining at end of 11 days.)

I want to install refrigeration, but I am considering two options:

Option 1. Purchase Dometic Portable and use as freezer to freeze water bottles, which I then place in icebox to refrigerate food. Cost would be approx. $450

Option 2. Purchase Cool Blue system and install in ice box - cost would be about $2500.

Either way, I will be running this off of batteries charged by 300 watts of solar panels and a 40a MPPT controller.

Anyone tried both these ways, and/or what are your considered opinions?
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Old 11-01-2017, 10:32   #2
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Re: Dometic Portable vs Installed Refrigeration

Hi there , it may take more energy and time to freeze a large amount of water in one of those small ice boxes . It may melt faster then you could freeze it .
I would go with the second option . Of course it all depends on how you cruise as well . If you are a weekend warrior then the cheapest solution may be all you need , if you spend extended time aboard , then bite the bullet and spend the money . I build what I believe is the best system on the market. Have a look , both the coolblue and my ColdEh systems are strictly air cooled .

We will be at the Annapolis Spring Boat show if you want to see our system up and running and take a look at the copper plates .

Regards John Tully
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Old 11-01-2017, 10:52   #3
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Re: Dometic Portable vs Installed Refrigeration

See my thread "Portable Freezer and Icebox Management" for a discussion of the Dometic option. Please feel free to PM me any questions.
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Old 11-01-2017, 10:54   #4
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Re: Dometic Portable vs Installed Refrigeration

Dometic does not have a very good rep. Or maybe I should say they didn't have. They may be better now days. Maybe an Engel would do it?
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Old 11-01-2017, 18:54   #5
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Re: Dometic Portable vs Installed Refrigeration

Freezing water takes a temp well below freezing to do in a timely manner. There are several companies selling either a cold plate or a freezing plate that could be added to your cold box.
The portable refers I have tried sometimes will keep already frozen stuff frozen, but don't have the heat transfer power to freeze a large volume. Especially if the bottle water is warm.
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Old 11-01-2017, 21:02   #6
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Re: Dometic Portable vs Installed Refrigeration

We cruised with a family in Mexico that did exactly what you are describing.
They had a very well insulated box that was their Refrigerator and then an Engle 40qt portable. They rotated frozen water bottles each morning and evening from the Engle to the refrigerator box. They cruised for years like that and it gave them a refrigerator and some small freezer space in-between the cycling in/out of the water bottles. They did have pretty big swings of their refrigerator temp, but managed to live with it.

If I was going on a short term cruise and budget was a huge concern in getting me AWAY from the Dock...heck...I'd do it myself. Will it work? Sure, they did it and in essence you are using a "portable and rechargeable eutectic holding plate"...but...isn't their always a "But".

The negative here is that you will most likely be asking your portable unit to run 24hrs/day. Sure 2.5A is small...but at 24hrs per day that's a 60AH per day load. For half that power you could have a 6-7CF Box with an installed CoolBlue freezer/refrigerator and "set it and forget it". (but yes more cruising kitty money)

Don't be tricked by the "low" real time amp usage of a portable. When I keep my Engle (Yes...even the owner of CoolBlue has an Engle on his boat) set to a hard freeze it never shut down when we were in Mexico...never...it just ran 24hrs per day at 2.7A. Here in Morro Bay where the boat temp is between 60-75degs it still runs from 60% to 80%% of the time when I keep it in hard freeze mode. So you are not going to save any power and if anything you will use more than a built-in system. The built in system will also give you more of a true single digit temp Freezer and True 35-38deg refrigerator.

Next, the hang-up I would have a hard time getting over would be the convenience issue. Having to add the water bottle cycle game to the daily to do list on a cruising boat may not sound like a big deal and perhaps if I was younger and more into camping I wouldn't care a much, but you could be setting yourself up for a hassle that sounds good at first, but then irks you by losing food when you forget to do the bottle swap out.

The important thing at the end of the day is that you cast off.
So I say if saving some money on the ships refrigeration system makes it more likely that you will be one of the few that really makes it off the dock...then by all means...do it! Sure you will use more power, sure it won't be as convenient, but I'd rather use more power and not be as comfortable than to never get off the dock!

Tech Note:
Now if you do go the frozen bottle route, don't use water. Beer maybe...but not water.
Fill your liquid containers with a 25% Glycol 75% water mixture (or maybe 30%/70%). That will lower the freezing point of your eutectic solution allowing you to store more energy absorption BTU's than plain water. This could require some testing/trial and error because you may find that your portable unit won't get cold enough to freeze the bottles if you lower the freezing point too much and get greedy on the amount of BTUs you want to "store" in the eutectic solution.

Tech Note 2:
When you do a Amp Hour per Cubic Foot volume comparison of the small portable Engle and Dometic units compared to say a 7CF box 1/3 Freezer and 2/3 refrigerator with a CoolBlue system in it. That's when the "efficiency myth" of the small portable units falls apart. What makes these small 35 and 40Qt portable units appear to be efficient is their small cubic foot size. 40Qts is a 1.33CF Box that's nothing when you compare it to a set-up that has a 2.1CF Freezer plus a 4.9CF Refrigerator and can run on less daily power with good insulation.

Cheers
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