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Old 09-01-2006, 10:22 AM   #1
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Will fridge run without battery power?

Hello.

Our couple of year old Dometic fridge is working fine both on gas and AC.

If you are running the fridge on gas, and let's say your batteries run down, will the fridge continue to cool and operate more or less as normal? I know that propane will still be going to the unit, but will it just shut down, ruining food if there is a batt. meltdown?

The only thing that I can see that may not work is the "convection" fan, but that wouldn't be missed

Anyone?

Jonathan
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Old 09-01-2006, 10:39 AM   #2
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Nope!

Hi Jonathan,

All modern RV refrigerators have a control board that acts like the 'brain' of the unit and REQUIRES 12VDC for the unit to operate. One of the things that it controls is the gas valve. If no voltage is present, the valve will close and no LP will flow to the burner resulting in no heat for the refrigerant and no cooling for the refer.
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Old 09-01-2006, 11:58 AM   #3
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The manual will tell you what voltage the unit will shut down at. I think on mine it "shuts down" at around 9 volts and the "Check" light comes on. Then around 5 volts the lights shut off. Mechanically the Dometic seems to work pretty well but the control "logic" is terrible. LEDs cost only pennies and draw virtually no current. It wouldn't have been hard to have a simple display for voltage (green / yellow /red) and a pizzo alarm when it shuts down would be really nice. Thermostatic control or at least some sort of crude indication of temperature would be nice and the "Climate Control" continuing to drain the battery (at ~1/2 Amp) when the fridge is turned "off" is just inexcusable. A lithium cell like digital cameras use would have operated the control logic with the gas valve in "Manual" mode at least overnight and probably longer. For the money they charge these "deluxe" features don't seem like too much to ask, do they? If they really wanted to go "all out" a solid state charging circuit could be built using the temperature differential from the flame to run the unit for as long as there's gas. But they didn't even include a cheap AC to DC converter so that the fridge can run on AC without the trailer battery. Stupid!

-Bernie
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Old 09-01-2006, 12:10 PM   #4
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Bernie and lewster.

I does seem odd that even though gas is getting to the burner (assuming the pilot is already lit) why the unit should go off in the event of a battery failure. It should just be running on gas. Period. Or am I missing something?

Now I suppose I should schlepp along a Coleman cooler for those just in case times...

Jonathan
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Old 09-01-2006, 12:32 PM   #5
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Quote:
Originally Posted by crazylev
assuming the pilot is already lit..Or am I missing something?Jonathan
hi 'lev

well they don't have traditional pilot lights anymore....

and the SAFETY feature is no juice no gas....since the controls are all electric.

i can report (but i don't recommend this) that my fridge has continued to cool with 12v levels below 9.....
i experienced this by accident...and it is possible the metering was in error.


cheers
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Old 09-01-2006, 12:44 PM   #6
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There is an answer ...

Quote:
Originally Posted by crazylev
... If you are running the fridge on gas, and let's say your batteries run down, will the fridge continue to cool and operate more or less as normal? I know that propane will still be going to the unit, but will it just shut down, ruining food if there is a batt. meltdown? ... Jonathan
Hi Jonathan:

Not all modern refrigerators require battery power to operate on propane; only those with complex operating systems for "convenience" or perhaps for "safety" do. One old fashioned exception is a small Norcold fridge seen here:

http://www.norcold.com/n300.cfm

which has simple, non-battery operated manual controls - how 'bout that, a "step forward" happily not taken !!

I'm sure it won't be too long before Dometic begins selling propane powered battery chargers so you can charge your battery to be able to operate your computer-controlled propane fridge.
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Old 09-01-2006, 01:13 PM   #7
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Quote:
Originally Posted by crazylev
....Now I suppose I should schlepp along a Coleman cooler for those just in case times... Jonathan
Jonathan:

I've heard a nasty rumor that Dometic is just about ready to announce their latest RV convenience and safety invention: a circuit-board controlled 20 pound block of ice for Coleman and other brand coolers. Every ice block will have electronic sensors spread throughout it that will feed back temperature and moisture level data to the control board, that will then adjust the melt-down rate for safe, linear temperature-controlled ice cooler cooling. If it senses the ice and/or ambient water temperature is too cold for comfortable human contact, it will shut down the melting process and sacrifice the food in favor of avoiding any unpleasant cold temperature direct skin sensory experience that may adversely affect the pre-programmed camping experience (available separately - see your dealer).

An optional, extra cost module can be added at the factory to the circuit board; it sends electronic brain waves to your brain, which waves tell you what to think of this great new experiece, minimizing the sense of sorrow resulting from food loss while simutaneously increasing the sense of camping safety and favorable product reaction.
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Old 09-01-2006, 01:44 PM   #8
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Fred.

I'm placing my order today!!!

JL

Thanks fo the info.
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Old 09-01-2006, 02:27 PM   #9
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Don't forget, that at least on new Airstreams (mine's a 2004 22' CCD), if the battery voltage drops below 10.5 volts, the solenoid switch to the battery will close and won't allow a recharge from the trailer's DC charger. You will need to get the voltage up above 10.5v by either your vehicle's alternator, a generator's DC charging or an external AC to DC charger connected to the battery. I found out the hard way! And it's not mentioned in the manual.
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Old 09-01-2006, 02:37 PM   #10
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the whole "fridge needing 12v" thing is just rediculous. Didn't anyone tell them that this makes the whole thing self-defeating????

My family used to vacation at a rustic cottage where there was 0 electricity. no a/c, no d/c, no solar...not even static. Old servel gas fridge kept everything nice 'n cold, though, no problem-o. gas lamps kept the place lit at night, and the gas water heater supplied ample hot water. (a nearby brook and gravity provided running water). The appliances in the RV should work just the same. The "option" to work on a/c or d/c electric is nice; neither should be "required".
I wonder if you can even get replacements for these old "house model" gas refrigerators?
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