Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
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 02-27-2011, 12:59 PM   #1
Senior Member
 
two2go's Avatar
 
Join Date: Dec 2007
Location: Parker, CO
Posts: 1,034
Mix AGM & wet-cell batteries?

I'm toying with the idea of replacing my wet-cell chassis starting battery with a Sears AGM battery for long life and no maintenance in a relocated place of limited access. I would use the space under the step where the chassis battery was to add a third 12v deep-cycle wet cell battery for 50% more house battery capacity.

What I wonder is if the charging systems (engine alternator and Xantrex Freedom 458 inverter/charger and Morningstar PWM solar controller) will work OK with both types of batteries? Basically, can an AGM battery be substituted for a wet-cell battery? I'm clueless about how both sets of batteries get charged, yet work independently, but they seem to.
__________________

__________________
2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342
two2go 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 02-27-2011, 01:24 PM   #2
Senior Member
 
Join Date: Dec 2010
Location: sioux falls sd
Posts: 320
Send a message via Skype™ to adehaan86
Never mix batteries. Same brand same model same everything. Anything different you will burn up batteries like it's your job.
__________________

__________________
2009 Dodge ram 2500 Cummins Mega Cab
1999 R29RL King of the road.
3 kids and a beautiful wife.
adehaan86 is offline   Reply With Quote
Old 02-27-2011, 02:10 PM   #3
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,322
Hi two2go,
I think your questions are about the various charging sources. The alternator is no problem. The charger/inverter should be no problem. It is a 3 stage smart charger. It may have settings you'll need to check the manual. If there are no settings it will work fine with the AGM battery. The solar charger is another animal. I see no reason why it would not work quite well with an AGM technology battery. However, solar is not my skill so another member might have additional information.

From a charging point of view the differences between wet cell and AGM are their charge acceptance rates and their maximum top off charge. The AGM will accept a very fast charge rate. The AGM top off charge is 13.8 VDC at 70 degrees F. The wet cell top off charge is 13.6 VDC at 70 degrees F.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 02-27-2011, 04:42 PM   #4
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,799
Though AGM's are "Maintenance Free" they are not all that long life when compared to other batteries.. The best you can hope for is a match for quality flooded wet cells at 1/3 to 1/2 the price of AGM's.

I'd re-think
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 02-27-2011, 05:08 PM   #5
Senior Member
 
Shadowcatche's Avatar
 
iRV2 No Limits Club
Join Date: Nov 2010
Posts: 1,219
Deep Cycle Battery FAQ one of the best sources of information
__________________
Shadowcatche is offline   Reply With Quote
Old 02-27-2011, 06:04 PM   #6
Senior Member
 
Rick Long's Avatar
 
Fleetwood Owners Club
Solo Rvers Club
Join Date: Dec 2007
Location: Some Place
Posts: 1,161
Send a message via Yahoo to Rick Long
I have the Sears AGM for my starting battery and 2 Trojan T105's for my house batteries. The Sears has a 100 month warranty, with 60 month (5 yr) direct replacement. I've had this set up for 3 years now and no problems at all... That AGM cranks my V10 with ease.
__________________
1999 Fleetwood Bounder 32H
Many Places Full Time
No Dog * No Cat * No Co-Pilot
Rick Long is offline   Reply With Quote
Old 02-27-2011, 06:21 PM   #7
Senior Member
 
UFO Pilot's Avatar
 
Winnebago Owners Club
Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 4,610
I have a wet cell for the chassis and AGM's for the house, no problems with either of them.
__________________
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination 39W Gas UFO Workhorse Chassis
Making the Journey in our Destination

UFO Pilot is offline   Reply With Quote
Old 02-27-2011, 08:20 PM   #8
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,078
It's true the general rule is "don't mix different types or ages of batteries". Liek most general rules, it is intended as advice for an average person in unspecified/unknown conditions. However, if you do understand the condition of your batteries, their capacity and charge rates and they are reasonably the same, yes you can successfully mix tyes and ages of batteries.

I've used a 12v Lifeline deep cycle AGM with a pair of 12 month old 6V GC batteries with no problem at all. They were connected to an Iota DLS 90 charger with the Charge Wizard, so it was a smart, 3 stage charger. Ran them 4 years that way and then traded the coach with the pair of 6V's still going strong. I took the Lifeline 12v out when I traded the coach and installed it in my bass boat, where it was used another 3 years. I still have it in my shop, were it serves as a 12v source for testing 12v devices. Doesn't ho;d a reliable charge any more, though.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is online now   Reply With Quote
Old 03-02-2011, 01:19 PM   #9
Senior Member
 
Join Date: Feb 2010
Posts: 4,493
AGM best for "creative" solutions and lifespan

Ok, creative is a stretch, but here we go.

Telco AGM batteries are manufactured in such a manner as to be approved for use inside switch rooms, in fact you could carry one in your lap on an airplane trip...you get the idea, they are SAFE AND DESIGNED for indoor use.

They also are designed for a 10 year installed life as FLOAT service, so if used fro standby 10 years, if used for deep cycle then not so much, but there are different designs currently where you still could find a suitable indoor rated deep cycle AGM/VRLA battery.

Once this is done, we get creative.

You need a spot where the environment is better such as inside the MH, also one that is never used.

So the drawers under the dining area are not as long as the bench because they hit the other side, what is behind the drawer? A lot of room.

We have enough room to place a few on each side, the 8 batteries I have waiting in the shop will be going there when time comes.

So it will add about 500 or so amp hours to the existing batteries without consuming any existing usable space.

I will add a specific charger for these batteries only, a simple battery maintainer/trickle charger will be fine as the charge can take days in our case.

Have not yet decided how to use them yet, possibly secondary backup for primary coach batteries, will do the design down the road.
__________________
TQ60 is offline   Reply With Quote
Old 03-05-2011, 09:20 AM   #10
Senior Member
 
Thor Owners Club
Join Date: Aug 2010
Location: Delaware
Posts: 537
Quote:
Originally Posted by adehaan86 View Post
Never mix batteries. Same brand same model same everything. Anything different you will burn up batteries like it's your job.
I'd agree, don't mix batteries that are part of the same "team" (like your house batteries). However, your house vs. chassis batteries are a different matter entirely, since they serve different purposes.

The main requirement for your chassis battery(ies) is cold cranking amps, to start your engine. Other than that, its job is very low-stress.

Your house batteries, on the other hand, are deep cycle batteries, providing power to everything in your coach while boondocking.

The only problem I see in mixing between house and chassis is the charge settings, which I understand are different for AGM's.
__________________
Crabby Mike is offline   Reply With Quote
Old 03-05-2011, 09:36 AM   #11
Senior Member
 
Bob/Becky D - VA's Avatar
 
Winnebago Owners Club
Workhorse Chassis Owner
Join Date: Aug 2007
Location: Virginia
Posts: 246
Quote:
Originally Posted by wa8yxm View Post
Though AGM's are "Maintenance Free" they are not all that long life when compared to other batteries.. The best you can hope for is a match for quality flooded wet cells at 1/3 to 1/2 the price of AGM's.

I'd re-think
Could you direct me to were you got this fact. All of my research indicates the oposite.

Thanks

Bob
__________________
USMC (Retired) Not as lean - Not as mean - but still a Marine!

2003 Itasca Suncruiser 38G Workhorse W22 8.1L, 2005 Grand Cherokee Toad
Bob/Becky D - VA is offline   Reply With Quote
Old 03-05-2011, 11:58 AM   #12
Senior Member
 
Join Date: Jul 2005
Location: Pahrump, NV
Posts: 329
Just like the rule is to not mix old & new batteries together, I woudl only use them if they are isolated into different banks that can't normally interact with each other.

We have 4x8D AGM's for the house and 2xGrp 31 maint. free wet cells for the chassis.

Our charger (Magnum secondary bank) can be set to charge the chassis batteries after the house batteries are full and can have different under/over voltage parameters set for the chassis batteries.
__________________
2011 Airstream Classic Limited
2011 GMC Sierra 2500HD Duramax/Allison
Techie is offline   Reply With Quote
Old 03-05-2011, 12:17 PM   #13
Senior Member
 
bluepill's Avatar
 
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,246
My thoughts:

You mention placing the battery in an area of limited access. As long as it is open to outside air (not inside your "house") the following applies. If it vents to the inside of your "house", AGM would be called for.

A standard flooded "maintenance free" battery should work well in your application, and be cheaper to buy.

It will have no problems with compatibility with your house batteries as far a charging goes.

It will not require any electrolyte level checking during its 4 to 6 year service life.
__________________
2008 Itasca Meridian 37H & 2015 Flagstaff T12RBST
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months - Woo Woo
Yellowstone Lake 6-1-2012
bluepill is offline   Reply With Quote
Old 03-06-2011, 02:16 PM   #14
Senior Member
 
two2go's Avatar
 
Join Date: Dec 2007
Location: Parker, CO
Posts: 1,034
I appreciate all the comments. I am coming to the conclusion to go ahead with my idea of an AGM chassis battery. I have a 6 yr old maint.-free starting battery still working fine, so I hopefully have time to map out the best new location for it. It seems to be a fact that the engine charging system sends charge to the starting battery first, and then to the house batteries. I still don't understand the inverter/charger setup. The article on batteries referenced above was very informative. Thanks to all.
__________________

__________________
2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342
two2go is offline   Reply With Quote
Reply



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
Purchasing Lifeline AGM Batteries wlf00 Winnebago Industries Owner's Forum 15 10-13-2010 08:55 AM
Mix and match AGM lifeline 4c's and 6c's Wingding Alpine Coach Owner's Forum 44 07-30-2010 10:41 PM
AGM Batteries gator67 Alpine Coach Owner's Forum 3 01-31-2010 12:26 PM
Trojan batteries and lack of warranty Harry B Winnebago Industries Owner's Forum 14 11-18-2007 07:20 AM
Best AGM Batteries afrank1971 Winnebago Industries Owner's Forum 23 05-09-2007 08:05 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:03 PM.


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