RV.Net Open Roads Forum: General RVing Issues: Residential Fridge battery run time

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

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

 > Residential Fridge battery run time

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 7  
Next
Sponsored By:
austinjenna

Columbus, Ohio

Senior Member

Joined: 03/27/2002

View Profile



Good Sam RV Club Member

Offline
Posted: 04/21/22 05:15am Link  |  Quote  |  Print  |  Notify Moderator

I know there are variables involved here on the manufacturer of the fridge, battery etc... But for those of you that have one assuming the standard group 27 battery the dealer gives you - how long can you run that fridge on just the battery?



2010 F350 CC Lariat 4x4 Short Bed
2011 Crusader 298BDS 5th Wheel
Reese 16K

MNRon

Tennessee

Senior Member

Joined: 08/18/2007

View Profile



Good Sam RV Club Member

Offline
Posted: 04/21/22 06:22am Link  |  Quote  |  Print  |  Notify Moderator

Our 2019 VanLeigh Vilano 320 has a Samsung residential fridge and Magnum 1k inverter. They draw approximately 160AHr per 24hr period. If you just have one standard lead-acid battery (85AHr) and only run it down to 50% before recharging (~12.0v, recommended if you want the battery to last very long), you will only get ~40AHr or 6hrs of running the refridgerator.

Of course there are several variables, while driving your truck will supply a few AHr (mine does ~3A) which will add to your time, if you run lights, furnace, etc you will eat up some of that capacity, if your battery is not new or in good condition it won't provide the full charge, etc. Bottom line, you really should have at least 2 standard batteries just for campground to campground with a residential fridge in my opinion, the equivalent of 4 FLAs for overnighting, and at least 6 for much boondocking.

I've added much larger batteries, and a whole-house inverter, to our 5er so that I can run everything and boondock for longer periods of time.


Ron & Pat
2022 F350 Lariat CCSB SRW Diesel
2019 VanLeigh Vilano 320 GK

JimK-NY

NY

Senior Member

Joined: 05/12/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 04/21/22 07:04am Link  |  Quote  |  Print  |  Notify Moderator

Ron did a great job of explaining the issues, except I would disagree on the boondocking recommendation. In Ron's example even 6 batteries would only keep the refrigerator running for a maximum of a day or so depending on other electrical use. Re-charging the battery bank would take a great many hours of generator run time. A large residential refrigerator is not practical unless you plan on hook ups at all times.

Skibane

San Antonio, TX

Senior Member

Joined: 11/09/2005

View Profile


Offline
Posted: 04/21/22 07:37am Link  |  Quote  |  Print  |  Notify Moderator

On any given residential fridge, the Energy Guide sticker will give you a good idea of how many KWH (and thus how many amp-hours) it uses per day.

For example, this fridge uses 702 KWH per year, which would be around 1.9 KWH per day.

1.9 KWH/day would drain around 158 amp-hours from a 12 volt battery per day:

1900 WH/day / 12 volts = 158 AH/day

Note that the fridge will consume more than this amount on hot days, and less on cold days. It's just the yearly average amount.

The inverter you use to convert 12VDC battery power to 120VAC will also waste some power, so you might actually need closer to 200 AH/day (on average) to power your fridge.

Then you have to consider that lead-acid batteries shouldn't be frequently discharged beyond 50-80 percent, and now you need 240-400 AH of battery capacity.

That's for 1 day of operation between battery recharges. If you can't completely recharge your battery every day, then you'll need more battery capacity to keep the fridge running until full recharge is possible.

pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 04/21/22 01:33pm Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Re-charging the battery bank would take a great many hours of generator run time. A large residential refrigerator is not practical unless you plan on hook ups at all times.


Unless you add sufficient solar--in which case the costs for generator can be ignored.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 04/21/22 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

austinjenna wrote:

I know there are variables involved here on the manufacturer of the fridge, battery etc... But for those of you that have one assuming the standard group 27 battery the dealer gives you - how long can you run that fridge on just the battery?
I thought dealers were installing 2 to 4 batteries with a compressor fridge/inverter.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

JimK-NY

NY

Senior Member

Joined: 05/12/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 04/21/22 03:15pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

JimK-NY wrote:

Re-charging the battery bank would take a great many hours of generator run time. A large residential refrigerator is not practical unless you plan on hook ups at all times.


Unless you add sufficient solar--in which case the costs for generator can be ignored.


That would not work well either. I see you live in Regina at about 50 degrees north latitude. At this time of year a roof mounted 100 watt solar panel would put out a maximum of about 40 AH/day. For Ron's example of a 160 AH refrigerator, it would take 4 panels to break even assuming absolutely no clouds, no shade. It would probably take closer to 8 panels just to keep that refrigerator going in normal use.

time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 04/21/22 03:55pm Link  |  Quote  |  Print  |  Notify Moderator

I recommend 600+ watts solar if camping off-grid and expecting minimal generator use.
Probably 400+ ah of LFP batteries too.

Sandia Man

Rio Rancho, NM

Senior Member

Joined: 08/09/2008

View Profile



Posted: 04/21/22 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

It sounds like you just need to power fridge from home to campsite or to the next campsite, might be doable for a single group 27 (not the best battery for this scenario) although you will arrive with a pretty depleted battery, a 2nd battery would certainly help. You could travel with fridge off for a few hours, we've done so and had no issues as ice cubes and ice cream are still frozen upon arrival.

I did not try to read too much into your OP as there is no mention of extended or overnight use, which obviously would require a rather large investment in solar and batteries, and still would require usage of a genny and a fast charging converter or inverter charger when solar can't keep up. We do lots of RVing under adverse weather conditions and would not do so without a genny onboard.

theoldwizard1

SE MI

Senior Member

Joined: 09/07/2010

View Profile


Offline
Posted: 04/21/22 06:06pm Link  |  Quote  |  Print  |  Notify Moderator

Skibane wrote:


Then you have to consider that lead-acid batteries shouldn't be frequently discharged beyond 50-80 percent, and now you need 240-400 AH of battery capacity.

Coincidentally, that is about what you would get out of two 6V golf cart batteries. For maximum battery life, try not to go below 80 discharge.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 7  
Next

Open Roads Forum  >  General RVing Issues

 > Residential Fridge battery run time
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:




© 2022 CWI, Inc. © 2022 Good Sam Enterprises, LLC. All Rights Reserved.