Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-27-2016, 01:02 PM   #1
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Powering a residential fridge

I have searched threads and found several that just about answered my following question, but not quite. I am not well versed in electric matters so need help from those that are. My question: I am looking at removing my Norcold 1210 and installing a residential model. My choices of replacement is limited due to fact that my 2011 Southwind 32V has the fridge mounted so that half of it is in the hallway, therefore opening doors very wide is problem. I have found a few that I can use where this will be no problem. I have plenty of room in old cutout to mount a residential unit. Now, when driving will my alternator keep the house batteries charged up enough to operate fridge? I only have 2 house batteries and since we don't dry camp, this should be enough IF alternator can do the job. I also have a 1200watt Magnum inverter. This power thing is only concern when driving as we always use shore power. I can, if needed, run the generator as I drive. Help would be appreciated very much. Thanks
__________________

__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-27-2016, 01:08 PM   #2
Senior Member
 
boyland's Avatar
 
Join Date: Apr 2016
Posts: 132
If possible i would add another battery.

I run with 3 batteries and have had no issues powering the unit.

It likely will be fine with 2 batteries but 3 would be better.
__________________

__________________
boyland is offline   Reply With Quote
Old 06-27-2016, 01:14 PM   #3
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,517
What output does your alternator have? Probably doesn't matter though as most residential refers don't take much power.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is online now   Reply With Quote
Old 06-27-2016, 01:14 PM   #4
Senior Member
 
Join Date: Aug 2001
Location: FL
Posts: 1,315
Two good 12v hybrid or better batteries should work. Two 6v batteries would be better for the fridge and everything else, but I would first try the 12v route without expending additional funds.
__________________
--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears
--2016 Montana 3711FL, 40'
--SOLD 2014 Wildcat 327CK, 38'
ralphie is offline   Reply With Quote
Old 06-27-2016, 01:20 PM   #5
Senior Member
 
Join Date: Sep 2012
Posts: 5,984
FWIW Try it before spending any more money on batteries. There are too many variables to say for sure but there are a lot of folks out there now with two batteries and a residential fridge. The issue might be getting to camp with a low battery. IF that is the case then look at increasing capacity or charging. If all you are running is the refrigerator while driving there should be ample capacity.
__________________
nothermark is online now   Reply With Quote
Old 06-27-2016, 01:22 PM   #6
Senior Member
 
38Chevy454's Avatar
 
Join Date: Aug 2013
Location: Cincinnati, OH
Posts: 742
Your alternator *should* be enough. I have no idea on your alternator capacity, but let's just assume 100 amps for sake of example:

Using the formula that Watts = Volts x Amps = 100 amps x 13 volts (your alternator puts out probably 13.5 +/- technically) provides 1300 watts of power. Of course you need some for the electrical needs of the chassis, so let's take 50% off the top for other chassis needs and some resistance losses and that the alternator is not running at 100% capacity. That leaves you with 650 watts available, but most residential frig only need 300-500 watts. So you have enough capacity with alternator and do not need the generator to run.
__________________
2005 Kenworth Showhauler truck conversion.
. 44 ft, Cummins ISX15 450 hp, 10 speed, twin screw
I used to have a handle on life, but it broke
38Chevy454 is offline   Reply With Quote
Old 06-27-2016, 01:41 PM   #7
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Thanks for reply. According to brochure the alternator is 130Amp but I have not looked to verify that. But it is the original alternator so that should be right. It has two 12 volt house batteries, they are Interstate but cant recall which ones.
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 01:43 PM   #8
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Thanks for the information. I have a friend that installed a residential and did nothing but plug and play. He has it good and cold before leaving on trip and if needed, about every 4-5 hours on the road he runs genny.
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 01:44 PM   #9
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Ralphie thanks. I currently hav 2 12 volt Interstate batteries, don't remember which ones right off hand though.
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 01:45 PM   #10
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Mr D, book says 130 Amp. Thanks
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 01:47 PM   #11
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Boyland, I would like to add a couple more but have no room and cant find a place to put them within reasonable distance. Thanks
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 01:54 PM   #12
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
I appreciate all the information you folks furnished to me. Like I said, electricity is not my thing, at least not when it comes to these fridges. My Norcold works as well as any I guess, but that is not bragging on it. I have found a residential that will fit the cutout with minimal cabinet work, (mostly just a little bigger trim), and the price is good as well. It is a Whirlpool, cant remember model number, but it is being put in a lot of MH nowdays. Ad it is about the same capacity as the 1210 and much lighter and cheaper. As a matter of fact I if I put it in and it fails, I can buy 41/2 more if needed, for the price of a new Norcold 1210. Again , thanks for all your help, I really appreciate it. John
__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Old 06-27-2016, 02:33 PM   #13
Member
 
noflyboy's Avatar
 
Join Date: Feb 2016
Posts: 57
Our Southwind has a residential fridge and 4 batteries. Here's some math I did on the power consumption of the fridge and it seems to match what I find in reality. So I guess here's some math:

The spec sheet on our fridge says 630kWh/year.
8,760 hrs / year, so 630000Wh / 8760 = 71.9W/hr on avg.

The fridge is 120V so 72W / 120V = 0.6A annual avg

But the converter draws from a 12V source, so the actual draw on the battery system is (not including converter efficiency waste):
72W / 12V = 6A avg

Now I have 4 6V batteries that have 208 amp hour capacity (20 hr rate, due to how battery capacity is measured this is of course hand-wavy) in the standard config of Series->Parallel so my battery bank ends up at 12V and about 400AH.

Just dividing 400AH/6H = 66H = 2.75 days. That's just for the fridge and of course it isn't the only power draw. So since I want to keep my battery charge from dropping much below 40% I end up only being able to run on battery for about 1 day. Something to keep in mind if you wanted to run with less battery capacity.
__________________
Matt & Leah
2016 Southwind 34A
noflyboy is offline   Reply With Quote
Old 06-27-2016, 02:41 PM   #14
Senior Member
 
catonine's Avatar
 
Fleetwood Owners Club
Join Date: Apr 2009
Posts: 426
Nofly, thank you. I am just interested in running off house batteries as I go down the road. If needed I can run genny, but I believe that from what I have learned here, I can travel on batteries as the alternator keeps charging them. Thanks
__________________

__________________
John- 2011 Fleetwood Southwind 32V
catonine is offline   Reply With Quote
Reply

Tags
fridge, power



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
In-slide Norcold/Dometic fridge vs residential fridge abi2001 5th Wheel Discussion 13 05-22-2016 07:53 PM
Powering 5W fridge from TV captainchuck RV Systems & Appliances 5 09-07-2013 08:11 PM
Powering Residential Refer from Inverter conmoto Monaco Owner's Forum 38 05-03-2013 11:12 AM
New Coach Batteries Not Powering Coach challengerros MH-General Discussions & Problems 14 02-23-2008 08:02 PM
Powering a laptop in Motorhome? Letsgoagain Monaco Owner's Forum 8 11-02-2006 05:35 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.