Good Sam Club Open Roads Forum: Electric cooler off of 12 volts
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in General RVing Issues

Open Roads Forum  >  General RVing Issues

 > Electric cooler off of 12 volts

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev  |  Next
wilber1

Abbotsford B.C.

Senior Member

Joined: 12/16/2002

View Profile



Posted: 08/03/19 01:55pm Link  |  Quote  |  Print  |  Notify Moderator

It will run fine of a 12V outlet as long as your rig is plugged in. The only thing we found is the battery charger and converter cooling fan runs constantly to keep the batteries topped up.


"Never trust a man who has not a single redeeming vice" WSC

2011 RAM 3500 SRW
2015 Grand Design Reflection 303RLS

wa8yxm

Wherever I happen to park

Senior Member

Joined: 07/04/2006

View Profile


Offline
Posted: 08/03/19 03:12pm Link  |  Quote  |  Print  |  Notify Moderator

There are two types of 12 volt coolers one runs on 12/120 the other on 12 period

The Compressor types (Danfoss class compressors) are power sippers.. typically less than 40 watts (or about 3 amps at 12 volt) if you have enough battery (I do) they work well (it does)

The other kind (Peltier Effect) has no moving parts save possibly a fan. Some of them can heat as well as cool (the chip works both ways) these are POWER SUCKERS typically drawing 6-10 amps for even a small (less than 1 CUBIC FOOT) box. They will kill your battery.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


naturist

Lynchburg, VA

Senior Member

Joined: 04/24/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 08/03/19 04:04pm Link  |  Quote  |  Print  |  Notify Moderator

Depends on how much power the thing draws and how much battery you have as well as how much your TV's alternator puts out. Not a simple question with a yes or no answer.

A common battery type used in many RVs has about 40 amp hours of available power. If that's all you've got, the more efficient unit @wa8yxm mentions will flatten your battery in about 11 hours, or a little less, unless your engine is running and alternator is supplying that power.

((NOTE: I said AVAILABLE power. Use more than that of the battery total power, and you will indeed KILL the battery, as in damage it.))





Lwiddis

Bishop, CA

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 08/03/19 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

“Will this cause any problems such as running batteries down or over using 12 volt outlet.”

How can anyone answer without OP giving the Coleman’s amp hour draw? Of course if OP knew the amp hour draw, he’d know the answer.


Winnebago 2101DS TT & 2019 Chevy Silverado LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL flagpole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - old MOS 1542 & 1560.


Bumpyroad

Virginia

Senior Member

Joined: 12/01/2005

View Profile


Offline
Posted: 08/03/19 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

LarryDel wrote:

We would prefer to plug cooler into 12 volt source permanently because there is not a nearby 120 outlet. Will this cause any problems such as running batteries down or over using 12 volt outlet. Thanks much!


this conflicts with your other statement. will run fine IMHO on shore power. suggesting dumping your $59 cooler for a $800 one seem unhelpful.
bumpy





Gdetrailer

PA

Senior Member

Joined: 01/05/2007

View Profile



Posted: 08/03/19 05:12pm Link  |  Quote  |  Print  |  Notify Moderator

Something like this..

[image]

Those are not a compressor fridge, they are based on a solid state device based on the "Peltier effect" of passing a current through a semi conductor which creates a cold side and a hot side.

They are horribly inefficient electric wise and they can only cool down to 40 degrees below the ambient air temperature.

Basically if it is 80F the lowest it can get inside is 40F which is marginally OK for food.

If it is 90F then the lowest it can get inside is 50F which is in the danger zone for food.

If it is 70F the lowest it can go is 30F and then your food starts freezing..

In a nutshell, no real reliable temperature regulation..

There are much better 12V fridges out there which have a compressor, yes they are not cheap but they are far more reliable as far as keeping your food cold..

wilber1

Abbotsford B.C.

Senior Member

Joined: 12/16/2002

View Profile



Posted: 08/04/19 03:32pm Link  |  Quote  |  Print  |  Notify Moderator

The 40quart Colman is rated at 4 amps, I have a Koolatron and they are all rated at 4.5 amps or less. It works fine from a 12v outlet but I won't use it unless my rig is plugged in. They aren't regulated so they just maintain about a 30F differential from ambient temperature. If you leave them plugged in on cooler evenings, some things will freeze overnight. Great for keeping drinks cold but I wouldn't keep anything perishable in one for more than a day or two if it is really warm outside.

* This post was edited 08/04/19 03:40pm by wilber1 *

mosseater

Dillsburg, PA

Senior Member

Joined: 10/19/2007

View Profile



Good Sam RV Club Member

Offline
Posted: 08/05/19 05:45pm Link  |  Quote  |  Print  |  Notify Moderator

We also have a Koolatron for about 3 years now. Our original Coleman died. We keep mostly drink in ours and supplement it by changing ice packs from the freezer daily. It does fine for what we need it for and has never drained our battery as long as plugged into shore power.


"It`s not important that you know all the answers, it`s only important to know where to get all the answers" Arone Kleamyck
"...An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." Col. Jeff Cooper
Sunset Creek 298 BH


ajriding

st clair

Senior Member

Joined: 12/28/2004

View Profile



Posted: 08/07/19 07:51am Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

“Will this cause any problems such as running batteries down or over using 12 volt outlet.”

How can anyone answer without OP giving the Coleman’s amp hour draw? Of course if OP knew the amp hour draw, he’d know the answer.


Because there are only a few of these brands out there, some of us owned them, and they all have known performances.
No matter the brand the performance will be similar.

I'd suggest go on Craigslist under the FREE section and pick up a dorm fridge for OP who wants to be plugged into 120v all the time.
Problem with the Coleman (under $100 coolers) is they can only cool down to 40 degrees below ambient temp, at best, in the shade. So, any day over 78 and the fridge will not keep food from spoiling. Needs to be 38 or below.

Bumpyroad

Virginia

Senior Member

Joined: 12/01/2005

View Profile


Offline
Posted: 08/07/19 09:12am Link  |  Quote  |  Print  |  Notify Moderator

ajriding wrote:

Needs to be 38 or below.


I like my beer at 41 degrees.
bumpy

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev  |  Next

Open Roads Forum  >  General RVing Issues

 > Electric cooler off of 12 volts
Search:   Advanced Search

Search only in General RVing Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2019 CWI, Inc. © 2019 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS