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Old 05-10-2012, 05:26 PM   #1
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12v or 12/120v fridge?

I am getting ready to replace my Igloo thermoelectric cooler with a TruckFridge TF65 and am trying to decide between getting the 12v unit or the 12/120v unit. I can see plusses and minuses to both so I though I would come and lay the question at the feet of the knowledgable ones. My SMB already has 120V on board.
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Old 05-10-2012, 06:27 PM   #2
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Re: 12v or 12/120v fridge?

Check into the dual voltage unit. I seem to remember they always default to the voltage you don't want when both are available. For example, you have the inverter on to watch TV, the fridge will run off the inverter instead of the 12V.

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Old 05-10-2012, 08:53 PM   #3
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Re: 12v or 12/120v fridge?

According to Dometic, their 120/12 volt units run off AC voltage and have a inverter to operate on DC, so it runs more efficient off AC. But I have been told by SMB to shut off the dedicated AC breaker that runs the refrigerator when using the vans inverter because of what Mike posted.
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Old 05-10-2012, 10:17 PM   #4
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12v or 12/120v fridge?

The TruckFridge has he same setup that Mike described. Am not sure that having a dual power unit is worth the extra money.


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Old 05-11-2012, 03:23 PM   #5
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Re: 12v or 12/120v fridge?

I added a converter to my 12V only Isotherm frig. When I plug the SMB int AC, I plug the frig into an AC outlet in the SMB. That is supposed to save my battery by using it less, in theory, anyway. I will never really know.

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Old 05-11-2012, 04:31 PM   #6
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Re: 12v or 12/120v fridge?

Angel, when you plug in, don't you charge the house batteries? And then all the 12V stuff is running off the charger. I know it works that way in my van, but maybe because the built-in battery charger is the only AC equipment in my van.

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Old 05-12-2012, 02:13 AM   #7
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Re: 12v or 12/120v fridge?

When I plug in at home, I do not always turn on the battery charger. I just plug in to use the 110 for the frig. My batteries are usually up because they are charged with the solar.

I think, (there I go thinking and not knowing) when I have the charger on, my batteries are being charged, but the frig is using some of the 12V, so I am going in a circle. Seems to me that the more the battery is being used and charged, that it will wear out sooner, than if I just run the frig off the 110. My first house battery only lasted 2 years and no one knows why. I now have 2 house batteries and use them less. I have never turned off the frig since I got the SMB. Love my Isotherm frig.!!!!!

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Old 05-12-2012, 08:47 AM   #8
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Re: 12v or 12/120v fridge?

I have a truck fridge 12/110

great fridge, no problems, it is my second
(first in my Westy)

IMHO, get the dual

and MAKE SURE you put a switch on the 110 v side
as stated it will switch when inverter on

bw out
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Old 05-12-2012, 12:22 PM   #9
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Re: 12v or 12/120v fridge?

I do the same as Angel...no reason to charge if the refrigerator isn't using DC and the solar is keeping the batteries up.
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Old 08-05-2012, 02:05 PM   #10
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Re: 12v or 12/120v fridge?

If your frig electronics is fundamentally a 12 VDC device as my Dometic CR-110 (110 VAC capability is an accessory option) then why run it on 110 VAC if the frig just converts that to 12 VAC before doing its job? I agree therefore that you really don't want it to switch to AC when you turn your inverter on 'cause then you are going from 12 VDC (bats) -> 110 VAC (invert) -> 110 VAC (frig input) -> 12 VDC (frig internals)! I have the AC option on my frig, but never plugged it the 110 VAC outlet in two years. Alternatively, you could just turn off the breaker if the frig is on a circuit of its own (I did that too). Of course, this assumes when on shore power, you are charging your batteries, or in reality, all 12 VDC stuff is being run off the charger section of your inverter.
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