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Old 08-09-2016, 11:15 AM   #1
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Dometic RV Freezer

thinking about getting one its a model # cf-80-ac-120u
i known it runs on 120v or 12 v
but what do you do if you need to overnight say at wallmart ?
do you need to run gen all night ? to not drain batterys ?
never had one so help me under stand this thanks john
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Old 08-09-2016, 11:32 AM   #2
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I'll pull up the spec's; but the power use would be a moving target .
A closed freezer full of previously frozen food will require little power to hold temp overnight.
If you're just loading the freezer at Walmart with food you want to freeze then you're going to have to run the gen set for a long time .
How many and type of batteries in the coach battery bank?
4- 6 volt golf cart batteries ? 2- 12 volt batteries ?
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Old 08-09-2016, 11:44 AM   #3
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yes meant to say full of frozen food we have two coach battery
most of time will be campgrounds but just in case need to overnight
thats what i am asking about thants
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Old 08-09-2016, 12:17 PM   #4
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From the specs, it would still be a moving target.
Ambient air temp around the freezer makes a difference too.
Power draw of 12 volt 7.5 amps .
Freezer would use 7.5 amps , 25 % of the time at 68f.
and 35% of the time at 89f.
Then your into calculating your battery bank's capacity and state of charge.
About the only way to make, 100%, sure the freezer wouldn't draw down coach batteries overnight would be to install a dedicated battery for the freezer .
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Old 08-09-2016, 02:07 PM   #5
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Not to blow your bubble but have you considered an Edge Star brand freezer/ fridge. Ours is all metal case, 550ish cost 4 years ago and has run continuously since. Regarding battery capacity ours will run on 4 6volters for 24 hrs easy and them some. We like our beer very cold thus the bay fridge.
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Old 08-09-2016, 06:42 PM   #6
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thanks going to give this some more thought
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Old 08-09-2016, 06:53 PM   #7
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For more info , on 12 volt loads and how to calculate battery capacities etc.
Keep this site handy.

The 12volt Side of Life (Part 1)
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Old 08-10-2016, 10:09 AM   #8
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We have an Engel which is similar to the Dometic. Ours also runs on dc or ac power and we have it hooked to both. When we disconnect from shore power, it automatically switches to dc power. Used as a freezer, it routinely keeps things much colder than our RV freezer. We have not had any problem keeping it cold overnight when dry camping nor depleting the batteries. We do have an onboard generator to top off our batteries when needed though. We spent 6 nights at Denali Natl park dry camping and had to use a generator for a couple of hours to keep the batteries topped off but again no issues with keeping the freezer cold. It was full of Alaska salmon and halibut!
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