Free 7 Day Trial RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
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 11-27-2021, 12:35 PM   #1
Senior Member
 
Fleetwood Owners Club
Join Date: May 2016
Posts: 142
Mixing battery sizes

My house batteries may have reached their end of life, almost 5 years. Still have a few things to check, but the time is coming so I am making plans.

I have 6 ea. 6 volt batteries in a serial-parallel configuration, and am looking to get a bit more battery capacity to (1) run longer without shore or generator power, and (2) allow me to use the full charging capacity of my Magnum inverter-charger.

My two options are to add two more batteries and figure out how to put them into the available space, or to go with larger capacity, physically larger batteries.

My problem is that two of the batteries are mounted in a location with no headroom, where the other four have 12 or so.

Can I put two GC2s in series and 4 GC2Hs or 901 size in the same series-parallel configuration I have now to get the additional capacity?

Thanks in advance,
Mike
__________________
Dean and Mike
2016 Fleetwood Discovery 40E
Dean n Mike 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 11-27-2021, 12:47 PM   #2
Senior Member
 
Join Date: Apr 2020
Posts: 303
You should be fine with what you propose. All of the batteries will be new and the same type- FLAs, so they should coexist ok even with different sizes.

David
DavidEM is offline   Reply With Quote
Old 11-27-2021, 12:55 PM   #3
Senior Member
 
Join Date: Jan 2015
Location: Prescott, Arizona
Posts: 3,291
Blog Entries: 6
Another idea: I have 6-6v AGMs in series/parallel. I use this bank for starting and the coach.
__________________
'04 Newmar MADP, 1100w of solar, towing a lifted Rubicon
ByeTheWay is offline   Reply With Quote
Old 11-27-2021, 01:40 PM   #4
Senior Member
 
Fiesta48's Avatar
 
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Nov 2010
Location: Texas
Posts: 3,925
Until recently I did not know how important it is to do a equalizing charge especially multiple 6v wet cell batteries. Uses 15.8+volts
1. Mixes up the sulfuric acid and water to prevent stratification. Acid only on bottom.
2. Removes sulfate from plates.
Both improves battery life. I'm on 7 years.
Don't mix different size and type batteries.
__________________
Full Timers.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
Fiesta48 is offline   Reply With Quote
Old 11-27-2021, 02:41 PM   #5
Senior Member
 
Join Date: Jul 2014
Posts: 29,427
Every time you drive, or plug in your motorhome, you combine two different size and type battery banks thru your isolation/bridging solenoid.
twinboat is offline   Reply With Quote
Old 11-27-2021, 03:11 PM   #6
Happy to be here!
 
vyndance's Avatar


 
Monaco Owners Club
Join Date: Dec 2012
Location: California
Posts: 183
You'll be fine. The only difference between those batteries is amp hour capacity. The charger won't care.
__________________
Bob & Barbara
2004 Monaco All Electric Signature Castle 45. S60
2020 JL Diesel RBE II
vyndance is offline   Reply With Quote
Old 11-27-2021, 08:38 PM   #7
Senior Member
 
Fleetwood Owners Club
Join Date: May 2016
Posts: 142
I neglected to mention that my plan would be to have all the same battery type FLA or AGM. They will be from the same manufacturer if I can do it.

Thanks for the inputs, including the reminder about equalizer charging. I will give that a shot before I spend money on either approach.

Mike
__________________
Dean and Mike
2016 Fleetwood Discovery 40E
Dean n Mike is offline   Reply With Quote
Old 11-28-2021, 07:04 AM   #8
Senior Member
 
Join Date: Nov 2018
Location: Beaver Dam, Wisconsin
Posts: 2,880
AGM Battery Equalization

Lots of good advice posted.

Don't try equalizing most brands of AGM at 15 volts. They do not have free flowing acid that can be stirred. Most will vent. Lost water cannot be replaced.

Substitute long charging time at 13.6 volts to clean sulfate from the plates. 24 hours can do a lot. Life Line batteries are more robust. See manufactures instructions.
__________________
Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
Persistent is offline   Reply With Quote
Reply

Tags
battery



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
mixing tire sizes? allegro1x Tiffin Owner's Forum 2 03-22-2018 08:11 PM
Mixing Tires Sizes - Steer vs Drive/Tag Tires dmason Monaco Owner's Forum 8 07-23-2013 08:06 PM
Front tires - Mixing Sizes in Emergency bontemp Newmar Owner's Forum 3 08-26-2007 05:19 AM
Mixing Battery Types mm58 Toy Haulers Discussion 4 01-17-2007 12:40 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 04:17 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.