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04-20-2017, 09:49 AM
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#1
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1 Rivet Member
2016 16' Sport
San Diego
, California
Join Date: Jan 2017
Posts: 14
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Can my single 12V Battery Keep My Refrigerator Powered?
My refrigerator operates under both shore power and propane.
I thought it could be powered by my single 12V battery while driving. But it doesn't. Any idea why? Or is is not designed for this operation?
If i added a second battery, would that be sufficient?
I have a 2016 Bambi 16'.
Please forgive what may be a newbie question!
.julian
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04-20-2017, 09:56 AM
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#2
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Rivet Master
2008 25' Classic
Full Time
, Texas
Join Date: Nov 2012
Posts: 4,309
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If its only a 2 way fridge, LP/AC, then you have to use propane while driving.
There are some 3way fridges but it takes a lot of power to heat up the heating element.
Even if my fridge was a 3 way I'd still use propane while towing.
Kelvin
__________________
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
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04-20-2017, 10:07 AM
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#3
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1 Rivet Member
2016 16' Sport
San Diego
, California
Join Date: Jan 2017
Posts: 14
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Thank you Kelvin!
I wasn't using propane while driving because I was under the impression that was risky / dangerous. But I am not sure why I thought that.
I guess it's not?
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04-20-2017, 10:13 AM
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#4
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Rivet Master
1974 27' Overlander
Baltimore
, Maryland
Join Date: Mar 2016
Posts: 1,042
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You would need an inverter to take your 12V power and turn it into 120V that the fridge could use to operate. That would be terribly inefficient. You would need a very large battery and a means to keep it charged. Most of us just run the fridge on propane while driving.
If you wanted to run a fridge off your batteries, for instance if you had a large solar array, the best solution is a 12V compressor fridge, not an adsorption fridge like the one you currently have.
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04-20-2017, 10:25 AM
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#5
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3 Rivet Member
2008 27' Safari FB SE
Long Beach
, California
Join Date: Jan 2015
Posts: 238
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Quote:
Originally Posted by juliandurand
Thank you Kelvin!
I wasn't using propane while driving because I was under the impression that was risky / dangerous. But I am not sure why I thought that.
I guess it's not?
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There are a lot of threads on this issue. I think this one is fairly recent: http://www.airforums.com/forums/f425...on-159066.html
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04-20-2017, 11:01 AM
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#6
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3 Rivet Member
2017 25' International
Framingham
, Massachusetts
Join Date: Oct 2015
Posts: 142
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If memory serves me, only the 22' Sport comes with a 3way frig that you can run while driving off the vehicle's 12v line.
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04-20-2017, 11:05 AM
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#7
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Moderator
2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 10,408
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A previous trailer I owned had a 3 way fridge that could operate on 12 volts. The draw on that battery when using 12 volts is very high and my tow vehicle would charge the battery as I drove. There are two conditions in that the power from the tow vehicle must be absolutely perfect and be of adequate amperage. Perfect in my view is that the wire gauge had to be large enough to support the amperage and that the connections between the trailer plug and socket on the tow vehicle must be absolutely clean. I found out the hard way that I had to keep those connections clean otherwise the amperage would drop and I'd get to the campground after 8 hours of travel with a dead battery.
That in itself is dangerous due to the fact that the battery will supply power to the trailer brakes if the breakaway switch gets activated due to hitch failure. If that battery is depleted you won't have trailer brakes in that specific emergency situation.
I travel with gas on and my only safety consideration is to turn off the fridge when I refuel the tow vehicle when towing.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56 S/OS#15
'04 Classic 30' S.O.,'03 GMC Savana 2500
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04-20-2017, 11:26 AM
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#8
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3 Rivet Member
1991 35' Airstream 350
Beachburg
, Ontario
Join Date: Aug 2008
Posts: 153
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Leave the propane on
It is just fine
NO safety risks
__________________
Howard and Ann Schutt
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04-20-2017, 11:33 AM
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#9
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4 Rivet Member
1977 31' Excella 500
Zavalla
, Texas
Join Date: Jul 2012
Posts: 497
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As others have said, the "normal" RV fridges don't usually work very well on 12v.
I replaced mine with an Italian brand named Vitrifrigo -- beautiful stainless steel unit made for Yachts. It has a more efficient danfoss compressor so I run it on 12v all the time. I also have solar and beefed up charging lines from my tow vehicle.
It is nice not having to keep up with the propane fills. Now I only use propane for hot water. My tanks last a LONG time.
__________________
WBCCI #1711
Texas Gulf Coast Unit, Texas Airstream Harbor
Angelina National Forest, Zavalla, TX
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04-20-2017, 12:03 PM
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#10
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Rivet Master
2013 31' Classic
billings
, Montana
Join Date: Feb 2010
Posts: 3,577
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We travel with the propane on while on the road, have since 1971' never any problems
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04-20-2017, 12:36 PM
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#11
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New Member
2017 27' Flying Cloud
Gramercy
, Louisiana
Join Date: Feb 2017
Posts: 1
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Should Work
I have a 27FB and my refrigerator runs on 12V control power with either 120V AC power to the compressor or propane flame moving the refrigerant though the system. As long as I have a 12V battery sufficiently charged and propane my refrigerator works. This is how it works when you are off the grid. PS an inverter changes D.C. battery power to AC power but my Airstream inverter only puts out 1000 watts which is not enough to run the refrigerator compressor but is enough to run the TV and radio. A converter changes AC power to DC power to charge your battery and power your refrigerator control power. I have both on my Airstream.
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04-20-2017, 12:44 PM
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#12
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Toaster Life
2010 23' International
Tucson
, Arizona
Join Date: Aug 2015
Posts: 246
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Definitely run it on propane when towing, but on hot days that may not be enough, with no shade on a hot day the fridge will likely still struggle, I do 2 things to help it. Fill the freezer with home made ice blocks (tuppewares filled with frozen salt water made at home) and add a bag of ice to the bottom bucket of the fridge that we use for ice cubes and ice water as it melts. I keep a fridge thermometer in the fridge to keep an eye on the temp. The domestic (sp?) in our 23 foot CD International has no adjustments, so you need external "hacks" to keep your food safe. On the cooler nights the freezer refreezes the ice in the Tupperware and this helps buffer the temperatures.
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04-20-2017, 01:18 PM
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#13
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Rivet Master
2006 19' Safari SE
Tucson
, Arizona
Join Date: Jun 2007
Posts: 4,627
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Your Bambi is the same year as ours, but we have a 19' so ours has a different fridge. Assuming you have the original fridge, it operated on propane or 120v ... no 12v operation. (However it uses 12v for the control lights, etc, so 12 IS required for operation, even when in propane mode.)
Set the operation on "auto"...that way it will know when there is 120 available and when it's not available ... it will switch back and forth automatically. You can override the auto mode by putting it in propane mode manually, but there's no need to do that under normal circumstances.
You can tow with the fridge on propane with no issues. If you have safety concerns (there is much debate over this), you can turn the frig off when fueling, since I believe your fridge is on the street side, nearest to the pumps in a gas station...and turn it back on when you are finished...
Good luck!
__________________
TB & Greg and Abbey Schnauzer
AirForums #21900
PastPrez, 4CU/WBCCI
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04-20-2017, 02:17 PM
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#14
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4 Rivet Member
2017 27' International
Lake Havasu City
, Arizona
Join Date: Feb 2017
Posts: 310
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I'm with CA_tallguy. I installed a Vitrifrigo DP-150 12 V/120 V compressor fridge in my motorhome last fall, and plan to do the same to my Airstream 27FB later this year. My propane usage is greatly reduced, there's no worry about fire, and no need to shut off the fridge at gas stations... I love it! Electric power consumption is typically about one sixth that of a standard RV absorption fridge operated from an inverter. The only drawback is the cost--these compressor fridges are about 40% more expensive than standard RV fridges. Well worth it to me, though!
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04-20-2017, 03:42 PM
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#15
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Rivet Master
2006 23' Safari SE
Biloxi
, Mississippi
Join Date: Nov 2011
Posts: 8,278
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Where are folks buying the Vitrifrigo DP-150 12 V/120 V? All I can find is outlets in Australia using google.
__________________
MICHAEL
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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04-20-2017, 07:13 PM
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#16
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4 Rivet Member
1977 Argosy 28
Euless
, Texas
Join Date: Jan 2014
Posts: 338
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My experience running refrigerator on 12v
My Dometic refrigerator draws about 3 amps on 120v and 33 amps on 12 (measured with a Trimetic meter) when run with a 450 watt modified sine wave inverter.
Based on that, if you have a single group 24 battery with about 75 amp hours, you could run your refrigerator about 1/2 hour before risking damage to your battery.
In my case, I have 300 amp hours of batteries plus 400 watts of solar and I can run my refrigerator with the inverter while driving for 5 or 6 hours and have from 0% to 8% battery drain depending on sun, clouds etc...
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04-20-2017, 10:31 PM
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#17
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4 Rivet Member
2017 27' International
Lake Havasu City
, Arizona
Join Date: Feb 2017
Posts: 310
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"Where are folks buying the Vitrifrigo [refrigerators]?"
Sure Marine Service. They sell Vitrifrigo, Isotherm, and Novakool 12 V compressor refrigerators in a variety of shapes and sizes. (And Force 10 all-stainless marine stoves--my new Airstream will be getting one of those as well! :-)
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05-10-2017, 06:39 PM
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#19
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3 Rivet Member
1972 25' Tradewind
Los angeles
, California
Join Date: Apr 2017
Posts: 112
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Quote:
Originally Posted by Paprika
I'm with CA_tallguy. I installed a Vitrifrigo DP-150 12 V/120 V compressor fridge in my motorhome last fall, and plan to do the same to my Airstream 27FB later this year. My propane usage is greatly reduced, there's no worry about fire, and no need to shut off the fridge at gas stations... I love it! Electric power consumption is typically about one sixth that of a standard RV absorption fridge operated from an inverter. The only drawback is the cost--these compressor fridges are about 40% more expensive than standard RV fridges. Well worth it to me, though!
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Hello there,
We just purchased 72 Tradewind 2 weeks ago and we were wondering what exactly do we need to run only electrical fridge as you mentioned? If we install 2 or 3 batteries in our trailer and solar panels.. would it be enough to support the fridge? Thank you. Aras.
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05-10-2017, 07:23 PM
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#20
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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Depends on the refer size and solar panel capacity.
You will also need an inverter with ample capacity to start the compressor in the refer. It should be a pure some wave inverter.
Inverters of the size required to start a refer will require heavy duty wiring and ample protection (fuse) between the inverter and the battery(s).
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