Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 28-03-2008, 17:02   #1
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,347
Using a small 115v fridge...vs...

OK, so after my last cruise and a few years I have moved on from 47 foot monohull and then 42 foot catamaran now to a little double ended trawler. Definitely not a teak palace! I need refrigeration for about 3-4 months a year we will be on the boat. There is no icebox so I'm thinking maybe just a small box style refridge/freezer like you might have in an office. The marine versions are 12v/120volt and run $900-1300. The office version is 120 volt and run $150-200. Other than that they look the same. The 12v versions have one compressor so that means they must have a mini invertor in them right? So why not just run the 120 volt version for $200 on my Heart invertor? The 120 volt fridge says it takes 1.6 amps.... Do the 12v compressors really draw that much less? if so they must be a lot more whimpy compressors right?
__________________

__________________
Cheechako is offline   Reply With Quote
Old 28-03-2008, 18:08   #2
Registered User

Join Date: Apr 2007
Posts: 11
The marine unit on my brother's boat has a primative inverter and actually runs better off of 120 AC.

If you already have an inverter, why not use it.

Charlie

Live more, die less
__________________

__________________
charleskaluza@gmail.com is offline   Reply With Quote
Old 28-03-2008, 19:02   #3
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
That would be 1.6 amps at 120 volts, about 16 amps at 12 volts plus whatever conversion loss in your Inverter. What is the duty cycle? These units don't have great insulation. You are probably going to want a pretty good battery bank or an auto-start generator to go this way. By the way, this is going to be the same for the small 120/12 volt units as well. You may be better off going built-in marine unit in the first place. However, if you do go with the 120 volt unit, let us know how it works out.

There has been several discussions on this subject. Try a search of the data base.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 28-03-2008, 20:37   #4
Registered User

Join Date: Nov 2005
Location: Maine and Newfoundland
Boat: Westsail 32
Posts: 76
Images: 1
What about an Engel?

We use one as our freezer. As far as I can tell its power draw is nearly negligible. We had the same unit in our land rover and it would sit all week, keeping ice cream frozen, and the rover would start without problem on one battery (despite the standard rover power leak).

It's hard to find a place to put it, but as far as I know you can't beat them for efficiency. For boat equipment they are not that expensive at $500-600.
__________________
Amfivena is offline   Reply With Quote
Old 28-03-2008, 22:33   #5
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,826
The ratings on most AC stuff I've seen are for MAX current. In this case, 1.6 amps is probably the startup current. Continuous is more likely a lot less, like 0.5 or so.
Just a guess, but an educated one. As long as the inverter would start it, I'd go that route.

One more thing, most fridges and freezers are now insulated with solid poured in place foam so they're pretty efficient.

Steve B.
__________________
senormechanico is offline   Reply With Quote
Old 29-03-2008, 11:12   #6
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,347
Good thoughts all..

I'll check out the Engel to see what it is. The boat has a mini galley but no ice box at all, so putting in a 12v danfauss unit etc would be a little labor intensive. Great point about the 16 amps... I forgot to use P=IV! It wouod be nice to know if the 1.6 amps at 115v is start up or daily average. In the carribean my sailboats probably averaged....100 amps per day to run the fridge. That's roughly 4 amps an hour at 12V or 48 watts an hour. Thanks all...
__________________
Cheechako is offline   Reply With Quote
Old 29-03-2008, 15:55   #7
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,577
Images: 240
Quote:
Originally Posted by senormechanico View Post
The ratings on most AC stuff I've seen are for MAX current. In this case, 1.6 amps is probably the startup current. Continuous is more likely a lot less, like 0.5 or so.
Just a guess, but an educated one. As long as the inverter would start it, I'd go that route...
Most appliances specs will tell you "watts" or "running current" (or Full Load Amps); and 1.6 A @ 120V seems a reasonable running current for a fridge.
Starting current may be about 6 times higher.
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Reply

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
Fridge Kit Installation mickmul Plumbing Systems and Fixtures 17 12-05-2008 15:18
Fridge compressors - EZ-KOLD chad.lawie Plumbing Systems and Fixtures 6 26-02-2008 19:52
Fridge / Freezer re paint Frank, Southern Voyager Construction, Maintenance & Refit 2 25-12-2007 07:27
Fridge door seals stuffinbox Plumbing Systems and Fixtures 1 03-04-2007 12:28
Isotherm Fridge and water heater kcrompton Provisioning: Food & Drink 5 25-12-2004 12:44



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:00.


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.