Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-08-2011, 21:43   #1
Registered User

Join Date: Dec 2009
Posts: 181
Is a Fridge Colder on AC or DC ?

Have a DC refridge that keeps the food cool and the drinks not cold enough for my taste. Works great as a prechiller to keep from melting ice in the cooler though when restocked.
Do ac/dc fridges get any colder while in the ac mode?
Thanks
__________________

__________________
US1Fountain is offline   Reply With Quote
Old 24-08-2011, 21:55   #2
Moderator
 
cabo_sailor's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Tarpon Springs FL
Boat: Cabo Rico 38
Posts: 1,905
Re: Fridge colder on AC or DC

I'm not totally clear on just what fridge you refer to, the one on my boat works equally well on either AC or DC. If you are referring to something like an Engel, I'm afraid I can't say but I'm considering one. If your fridge only keeps the food cool, which is a potential health hazard, perhaps you need to get it serviced. Mine keeps foods cool and provides a source of ice for those ever popular glasses of "thought provoker".

Rich
__________________

__________________
cabo_sailor is offline   Reply With Quote
Old 25-08-2011, 04:42   #3
Registered User

Join Date: Jun 2010
Posts: 542
Re: Is a Fridge Colder on AC or DC ?

I found that keeping the frig full helped keep things colder so the volume to cool is reduced. When food or drinks were consumed plastic jugs of water were used to replace that space. Jugs of ice help too treating the 12v fridge as an ice chest. Keeping kids out of it and keeping the door open only as necessary helped too.
__________________
Wavewacker is offline   Reply With Quote
Old 25-08-2011, 05:17   #4
Registered User

Join Date: Feb 2009
Posts: 1,848
Re: Is a Fridge Colder on AC or DC ?

Mine is the same on ac or dc
__________________
motion30 is offline   Reply With Quote
Old 25-08-2011, 08:38   #5
Registered User
 
Unicorn Dreams's Avatar

Join Date: Aug 2007
Location: Clear Lake Marine Services - Seabrook, Texas
Boat: Gulfstar, Mark II Ketch, 43'
Posts: 2,359
Re: Is a Fridge Colder on AC or DC ?

Mine only runs on DC and the freezer is sub-zero
__________________
Formerly Santana
The winds blow true,The skies stay blue,
Everyday is a good day for SAILING!!!!
Unicorn Dreams is offline   Reply With Quote
Old 25-08-2011, 10:46   #6
Registered User
 
familycruisers's Avatar

Join Date: Aug 2011
Location: On the boat
Boat: Westerly Centaur. 26'
Posts: 500
Send a message via Skype™ to familycruisers
Re: Is a Fridge Colder on AC or DC ?

AC/DC compressors are typically from what ive seen are danforth50's. Compressor runs the same AC, or dc. Things that will effect cooling are in no apparent order are
Blocked/restricted condensor, blocked/resticted evaporator(you need good airflow or waterflow in some instances for efficient use on both), insulation of the box (is of sufficient, theres some space age stuff available now, door/lid gaskets (are they worn and stiff or stool nice and pliable. Once you initially cool the space and everything in it , solid objects don't absorb heat as fast as air, therefore if the box is fuller and you open the lid, you have less airspace that quickly absorbs heat comparitively...
__________________
familycruisers is offline   Reply With Quote
Old 25-08-2011, 11:43   #7
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: Is a Fridge Colder on AC or DC ?

All Danforth compressor boat refrigerators (which are the great, great majority of them) run the same on AC or DC.

RV type, absorption units that are installed on some cats and trawlers will run warmer on DC because the DC wattage is lower than the AC (or propane) wattage and so it will run warmer. Dometic says that DC usage is only for use for a short period while being towed to a new site and isn't meant for heavy duty cooling.

David
__________________
djmarchand is offline   Reply With Quote
Old 25-08-2011, 14:22   #8
Registered User
 
Unicorn Dreams's Avatar

Join Date: Aug 2007
Location: Clear Lake Marine Services - Seabrook, Texas
Boat: Gulfstar, Mark II Ketch, 43'
Posts: 2,359
Re: Is a Fridge Colder on AC or DC ?

Thought Danforth made achors

Danfoss makes compressors.
__________________
Formerly Santana
The winds blow true,The skies stay blue,
Everyday is a good day for SAILING!!!!
Unicorn Dreams is offline   Reply With Quote
Old 25-08-2011, 15:16   #9
Registered User
 
familycruisers's Avatar

Join Date: Aug 2011
Location: On the boat
Boat: Westerly Centaur. 26'
Posts: 500
Send a message via Skype™ to familycruisers
Re: Is a Fridge Colder on AC or DC ?

Quote:
Originally Posted by Unicorn Dreams View Post
Thought Danforth made achors

Danfoss makes compressors.
Oops, Freudian slip perhaps!lol Danfoss , danfoss, danfoss...
__________________
familycruisers is offline   Reply With Quote
Old 25-08-2011, 15:52   #10
Registered User
 
Unicorn Dreams's Avatar

Join Date: Aug 2007
Location: Clear Lake Marine Services - Seabrook, Texas
Boat: Gulfstar, Mark II Ketch, 43'
Posts: 2,359
Re: Is a Fridge Colder on AC or DC ?

I just couldn't resist...
__________________
Formerly Santana
The winds blow true,The skies stay blue,
Everyday is a good day for SAILING!!!!
Unicorn Dreams is offline   Reply With Quote
Old 25-08-2011, 16:08   #11
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,456
Images: 69
Re: Is a Fridge Colder on AC or DC ?

Quote:
Originally Posted by motion30 View Post
Mine is the same on ac or dc
As you'd expect. Fridges are controlled by thermostats. Should be the same thermostat, therefore the same temperature, regardless of the power source.
__________________
44'cruisingcat is offline   Reply With Quote
Old 25-08-2011, 17:46   #12
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: Is a Fridge Colder on AC or DC ?

Quote:
Originally Posted by 44'cruisingcat View Post
As you'd expect. Fridges are controlled by thermostats. Should be the same thermostat, therefore the same temperature, regardless of the power source.
Well, yes. But if the refrigeration produced (butu out) is less than the heat load (btu in) then refrig will get warmer until they are in balance. That is what happens when an RV absorption type unit is temporarily run on DC.

David
__________________
djmarchand is offline   Reply With Quote
Old 25-08-2011, 18:12   #13
Registered User
 
svcambria's Avatar

Join Date: Jun 2010
Location: Mexico (currently)
Boat: Panda 40 - S/V Cambria
Posts: 573
Re: Is a Fridge Colder on AC or DC ?

Quote:
Originally Posted by djmarchand View Post
Well, yes. But if the refrigeration produced (butu out) is less than the heat load (btu in) then refrig will get warmer until they are in balance. That is what happens when an RV absorption type unit is temporarily run on DC.

David
Then it would be a matter of effectiveness with AC or DC, but 44'cruisingcat is right, the thermostat will drive the temperature to its setting on either source. If it is less effective with (e.g.) DC, then it will run longer and if one opens it frequently or runs a lot of warm food through it or if you use it in the Persian (or Arabian) Gulf in the summer, then it may never catch up, ...

Michael
__________________
svcambria is offline   Reply With Quote
Old 28-08-2011, 18:58   #14
Registered User

Join Date: Dec 2009
Posts: 181
Re: Is a Fridge Colder on AC or DC ?

Thanks for the replies. It's a Norcold dc fridge. The t-stat explaination did not cross my mind.
__________________
US1Fountain is offline   Reply With Quote
Old 28-08-2011, 19:27   #15
Registered User
 
familycruisers's Avatar

Join Date: Aug 2011
Location: On the boat
Boat: Westerly Centaur. 26'
Posts: 500
Send a message via Skype™ to familycruisers
Re: Is a Fridge Colder on AC or DC ?

Tstat doesn't explain the problem you described unless every time you go DC you turn the stat down.
__________________

__________________
familycruisers is offline   Reply With Quote
Reply

Tags
refrigerator

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DC Generator - The Smart Way to Go typhoon Electrical: Batteries, Generators & Solar 96 22-03-2014 09:50
Save the Anchorage In Washington, DC ANCHOR DC Cruising News & Events 129 01-08-2012 09:00
Separate Fridge and Freezer - Thoughts ? SV Demeter Plumbing Systems and Fixtures 22 14-07-2012 05:31
Wiring Small Inverter into AC Panel janders Electrical: Batteries, Generators & Solar 3 25-07-2011 17:42



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:19.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.