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Old 07-13-2019, 10:01 PM   #1
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Default Running a Dometic fridge on 12V

Hi - My fridge is supposed to switch automatically from 12V to 110. It runs fine when the inverter is on but doesn't come on otherwise. Can't figure out what I'm doing wrong. This is my first RV and I have a lot to learn. Thanks!
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Old 07-13-2019, 10:42 PM   #2
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There are very few fridges that switch from 12 volt to 110 and back automatically. I once said there were none but was wrong. Give us your model number to be sure.

Those I have seen that do that were originally designed for sailboats, and are not available aftermarket in the US. Leisure Travel vans installed the one I saw. I believe they switch from solar to propane to AC depending on what is available.

Didn't realize it is probably a compressor fridge in a Hymer Activ. Those that know about compressor fridges will need to answer.
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Old 07-14-2019, 12:56 AM   #3
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Default Fridge power

You're right - it's installed in a 2018 Hymer Aktiv. After thinking about it more I suspect it's a power mgmt issue and I may not have initialized the batteries correctly before setting out. Any other ideas, please advise. Thanks!
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Old 07-14-2019, 04:10 PM   #4
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Engel switches automatically.
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Old 07-14-2019, 04:44 PM   #5
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I had this same fridge in my 170. The first thing a tech told me was to go to the circuit board and shut off the 110 fridge breaker ... and to never use 110 for this fridge. It works best on 12v... more efficient. It uses very little power on 12v, unlike the old 3 system fridges. I haven't used 110v for a fridge for over 4 years now.

Keep it on 12v all the time and you will never again have to worry about the unnecessary switching back and forth.

Problem fixed...
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Old 07-14-2019, 04:53 PM   #6
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Default Good idea!

Thank you for the suggestion.
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Old 07-14-2019, 06:24 PM   #7
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For what it's worth, this is from a Dometic user's manual : "1. DC MODE
DM2663 When operating in DC mode (3-way models only), the DC mode indicator lamp is illuminated and all other lamps are off. To select another opČerating mode, turn off the DC mode by pressing the DC selector button. The DC lamp is turned off. When there is no charging of the house battery, switch to AUTO mode or GAS mode, since runČning the refrigerator on 12 VDC will quickly drain the battery."
You can download Dometic manuals from this site:
https://www.dometic.com/en-us/us/pro...gerators?at=rv
Scroll down to find your model, then click on the picture. It will take you to something like this picture. Click on "Manuals" at the bottom of the screen then select the manual you want to download.
Attached Images
File Type: jpg dometic site.JPG (57.2 KB, 3 views)
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Old Yesterday, 12:49 PM   #8
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It is NOT a 3 system fridge. There is only one switch... on/off. It is a 12v fridge that will work on 110, but you never need to actually let it switch to 110...
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Old Yesterday, 02:21 PM   #9
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I have no idea what model is being addressed. Just know they are not all the same. Tried to help by posting a link to the manufactures manuals. I'll shut up and go back to my corner.
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Old Yesterday, 08:02 PM   #10
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How long can you run one of these new 12v comp fridges on battery? Are they viable for boondockers or is the tech not there yet?
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