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Old 04-06-2022, 08:28 PM   #1
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12 volt fridge

A quick question for my daughter, about how long will a 12 volt fridge operate on two standard 12 volt batteries.

I know it depends on how large the batteries are, just looking for an approximation.
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Old 04-06-2022, 09:25 PM   #2
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An RV fridge will draw about 2-4 amp per hour depending on the fridge.
2 standard Rv/marine batteries say they have 75 amps when new, thatís 150 amps, but you should not use more than 50%.

I just did a draw down test on one I had that is 4 years old. I could only get 26amps out of it before it dropped to 11.7.

So, that would estimate you get 52 amps from your two, or course depending on the condition of your batteries.

Estimate is you will get 12-24 hours as long as nothing else draws power, like lights, CO2 detector, usb chargers and of course anything big like jacks, slides, heater, etc.
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Old 04-07-2022, 04:20 AM   #3
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GHen gave a good estimate, but without more specifics it's only a guess. It depends on your fridge amp draw, some larger units can draw 10 amps, and your battery condition and capacity. Plus, it won't normally run constantly once it's cooled down, and outside temps also are a factor.
Try it in your driveway, then you'll have a good idea of what to expect.
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Old 04-07-2022, 05:53 AM   #4
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Good recent video talking about it.

https://youtu.be/RwHU_NY0Auo
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Old 04-07-2022, 06:58 AM   #5
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Batteries really do make a difference. If you use LiFePO4 batteries you can run the 12 Volt fridge approximately twice as long as the equivalent sized lead-acid battery.
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Old 04-07-2022, 07:11 AM   #6
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This is very subjective but I have a standard single deep cycle Group 24 battery I believe it is 80 amp hours and I can run my 12 Volt Norcold fridge for just over 6 hours. A little bit longer if we are traveling and my truck is trickle charging as we are driving. There are really way to many variables to make a comparison though...
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Old 04-07-2022, 09:31 AM   #7
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THANK YOU ALL
I just forwarded the video to my daughter along with all the info you provided

My experience is limited to an absorption type that I had in our Holiday Rambler and now a residential in our new Pinnacle.

She is contemplating buying a small towable and was curious.

Again Thank you all for the quick response and all the info.
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Old 04-07-2022, 01:33 PM   #8
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Most likely the new rv will have some combination of 12v, 110volt and/OR propane settings.

Mine is 110v and propane. I had an older rv that had a 12v option with propane but seldom used the 12v setting. Normally itís always running on propane unless Iím plugged into to 110v.
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Old 04-07-2022, 02:39 PM   #9
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Quote:
Originally Posted by GHen View Post
Most likely the new rv will have some combination of 12v, 110volt and/OR propane settings.

Mine is 110v and propane. I had an older rv that had a 12v option with propane but seldom used the 12v setting. Normally itís always running on propane unless Iím plugged into to 110v.
The trailer she is looking at has a fridge that is 12volt only, no propane or 110.

Thanks for your help.
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