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04-02-2010, 04:22 AM
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#1
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Rivet Master
1981 27' Excella II
mays landing
, South Jersey
Join Date: Nov 2009
Posts: 1,179
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Dometic question
Does the refrigerator draw on the 12 volt system at all? Test ran it last couple of days and it killed the batterys.
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04-02-2010, 04:42 AM
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#2
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Rivet Master
1961 24' Tradewind
1969 29' Ambassador
1970 21' Globetrotter
Jamestown
, Tennessee
Join Date: Jul 2008
Posts: 1,783
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That depends on the age of the fridge. Older ones used no battery power, newer ones use some to run control circuits.
Some 3 way models will run on 12 volts as well as gas and 110 but the current draw will kill batteries in a few hours so the 3 way models are not common in travel trailers.
__________________
Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
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04-02-2010, 04:42 AM
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#3
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Rivet Master
1973 27' Overlander
Currently Looking...
Jupiter
, Florida
Join Date: Apr 2006
Posts: 2,062
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Depends on the refrigerator - the constant heat of a small flame similar to a gas stove pilot light is the power a RV ammonia cycle unit runs best on. If your unit is a three-way (propane:120VAC:12VDC) to use 12V to make similar heat draws a good chunk of current 24/7 and will kill batteries fast.
The trickle of a 12V refrigerator controller logic should not flatten batteries.
__________________
The days are short and the night is long and the stars go tumbling by.. . ~Airstream~
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04-02-2010, 05:52 AM
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#4
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Rivet Master
1981 27' Excella II
mays landing
, South Jersey
Join Date: Nov 2009
Posts: 1,179
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Thanks. It is a newer model 2-way. Ran for about a week. Went out to check it yesterday, and it was off. I finally realized I had no 12V power. Charged batteries and it turned on. Learn something new every day!
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04-02-2010, 06:17 AM
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#5
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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The fridge draws about half an amp (about like a single dome light in your car), so over the course of a week or so it will drain the batteries.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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04-02-2010, 06:36 AM
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#6
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3 Rivet Member
1964 26' Overlander
Gloucester
, Virginia
Join Date: Mar 2010
Posts: 167
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1/2 an amp could be easily made up with a simple solar panel.
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04-02-2010, 06:38 AM
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#7
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Rivet Master
1981 27' Excella II
mays landing
, South Jersey
Join Date: Nov 2009
Posts: 1,179
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Thanks Terry. So would it be OK to keep the Univolt on when the reefer is on? Or woul I fry the batteries?
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04-02-2010, 06:47 AM
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#8
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Rivet Master
1961 24' Tradewind
1969 29' Ambassador
1970 21' Globetrotter
Jamestown
, Tennessee
Join Date: Jul 2008
Posts: 1,783
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Quote:
Originally Posted by JFerguson
1/2 an amp could be easily made up with a simple solar panel.
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This is true however it would be much nicer if some one still made a fridge which did not require 12 amp hours a day to run. I think Norcold still had one a few years back , but don't know if they still do.
If I ever have to update the fridge (mine is old enough to not use any electric) I would have to find enough real estate on top to add one more panel just to maintain the effectiveness of the present solar system.
__________________
Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
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04-02-2010, 04:22 PM
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#9
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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Quote:
Originally Posted by noreen
Thanks Terry. So would it be OK to keep the Univolt on when the reefer is on? Or woul I fry the batteries?
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The Univolt in your trailer is a later generation than the early "battery boilers", though given enough time plugged in, it will eventually do this. When you have an extra couple of hundred dollars, and upgrade to a 3 stage converter would be a good investment.
Short-term, you can leave it plugged in. Say, if you plug it in a few days before going on a trip to ensure the batteries are fully charged, and the fridge is cold, would be okay.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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04-02-2010, 05:06 PM
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#10
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1 Rivet Member
2008 34' Classic S/O
Cumberland
, Rhode Island
Join Date: Jun 2008
Posts: 10
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Dometic draw
Had a problem in one refrig , and found the switch BETWEEN the two doors to turn OFF the dehumidifier around the chambers. Switched it off and not as much draw.
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Doc & his bride
WBCCI #10118- NEU
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04-03-2010, 06:47 AM
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#11
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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Quote:
Originally Posted by Silvia
Had a problem in one refrig , and found the switch BETWEEN the two doors to turn OFF the dehumidifier around the chambers. Switched it off and not as much draw.
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Yes, that's a biggie. I would make sure it's off, unless you're plugged in to shore power.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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