Reply
 
Thread Tools Display Modes
 
Old 09-17-2018, 11:56 PM   #1
Junior Member
 
Join Date: Sep 2015
Posts: 24
Best 12v AGM Battery Choice (27 or 31 Group)

Anyone have an opinion on what the best choice is for replacement batteries? I currently have 2 12v batteries (27 series (group)). They are the batteries that came with the RV when we bought it (2016 Sequoia GKS).

We have the residential fridge with the 1000w inverter. Like I said, we currently have 27 series 12v batteries. I understand that 6v gives more AH but right now I am going to stick with 12v.

I really don't know what I currently have. I have never opened the battery box to look at them (I know that is bad... ). I am assuming that they are probably flooded cell batteries. I am definitely thinking about doing AGM so to reduce maintenance.

I have read up on the Magnum charger capabilities and it looks like it can handle an AGM battery. There might actually be a setting that needs to be changed. I believe the default setting is "flooded".

I would like to maybe bump up to the 31 series if possible. I don't know if that size is larger than the 27. Probably depends on the manufacturer.

Anyway, does anyone have an opinion on whether to go with Duracell or Interstate or whatever for a 12v AGM 27 series (or 31 series) battery? These batteries are quite pricey. I am interested to know what you all think.

Thanks,
Mike
Mike&Pam is offline   Reply With Quote
Old 09-18-2018, 03:16 AM   #2
Senior Member
 
Rosey's Avatar
 
Join Date: Feb 2015
Posts: 291
I went with Optima series 24 Bluetop AGM Marine/RV batteries (on sale but still pricey) on my 39MB that had the stock 31 flooded batteries. Bought em at Advance Auto. Replaced the stock “sealed” battery boxes with battery trays & simply installed a larger vent in the battery compartment for increased ventilation. Those stock battery boxes are a terrible design to install, check, or remove heavy batteries in the battery compartment. So far so good. I reset my charger/inverter for AGM charging. Simple to do, search here or online.
__________________
Mike & Gayle
Our 3 fur children "Ting-Tang"&"Saylor"(Shih Tsu's) &"Kai" (Finnish Spitz)
2007 Silverado Classic 3500 LT C.C. Longbed Dually,
Duramax, Allison Tranny, 62 Gal. Titan Tank
2016 39MB 5.5 Onan, Residential Package, Goodyear G114's, Mor/ryde heavy duty Shackle/bushing upgrade.
Rosey is offline   Reply With Quote
Old 09-18-2018, 05:16 AM   #3
Senior Member
 
Jim & Mary's Avatar
 
Join Date: Jul 2013
Posts: 535
I've seen some negative reviews of the Interstate AGM's. One of our forum members (Ford Truck Guy) recently converted to Lifeline. I was going to do the same as our two group 31's (Sears Diehard Marine AGM's) are about 5 and a half years old. I took them to the Lifeline distributor in our area. They load tested both and they both were better than new specs. I'd give them a look.
__________________


Jim & Mary 2013 36 RL with Titan Disc Brakes Residential Fridge Goodyear 17.5 H rated tires MORryde IS, MORryde pin box 2015 Ford F350 King Ranch DRW
Jim & Mary is offline   Reply With Quote
Old 09-18-2018, 12:26 PM   #4
Senior Member
 
Ford truck guy's Avatar
 
Join Date: Jul 2015
Posts: 1,706
Yes Jim, It was me who swapped to Lifeline...

I called Magnum and they and they told me that there is a setting specifically for the AGM’s. AND they also told me that in their eyes, Lifeline was at the top of the list.

They are expensive, but evidently wort the cost, we shall see... There are a lot of folks over on the other forum that I visit that swear by them...

I believe that I paid around $300 each..???
__________________
2015 F-350
2016-38RL with-
17.5 Goodyear 114's , Titan Disc brakes, MorRyde 8K IS, Onan 6.5 , F&P D/W , Whirlpool fridge , two awnings , Slide in Slide ,Pewter/Urban Clay in-Black & Silver out

http://i.imgur.com/D0Lp87sl.jpg
Ford truck guy is offline   Reply With Quote
Old 09-18-2018, 02:21 PM   #5
Senior Member
 
mhs4771's Avatar
 
Join Date: Jan 2012
Posts: 2,190
Mike to answer part of your question: Yes the OEM batteries are Flooded Cell and if you haven't done anything to them since new, most likely they are dry. I add water twice a year to mine and have never had the plates exposed.
__________________
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" GY114s w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
mhs4771 is online now   Reply With Quote
Old 09-18-2018, 02:40 PM   #6
Junior Member
 
Join Date: Sep 2015
Posts: 24
Thank you all for the responses. You always have good wisdom to share. Because of the fact that I want to simplify maintenance, I am thinking that I will go with AGM. A couple of questions:

1) When I am storing my coach, I have a campsite that I store it at and I have always left shore power hooked up so to keep the batteries charged all year round. Some people say that you should not charge during storage because of the issue with overcharging and "boiling" the cells (for "flooded" batteries) but I am thinking with the magnum technology, it has those 4 modes of charging and it should not overcharge the battery. Furthermore, AGM batteries don't need water so the "boiling" effect is not an issue. Given that I will go with AGM instead of flooded, what are your thoughts on this? Do you think that the magnum charger will do what it is supposed to do and not overcharge the batteries?

2) I understand that the OEM battery box is a pain but for now, I don't want to change it up. Can I put AGM batteries in there? I was reading that you cannot put AGM batteries in an enclosed space. However, I am thinking that this battery box is vented. Any thoughts?

Thanks,
Mike
Mike&Pam is offline   Reply With Quote
Old 09-18-2018, 03:22 PM   #7
Senior Member
 
atom ant's Avatar
 
Join Date: Feb 2013
Posts: 7,026
Quote:
Originally Posted by Mike&Pam View Post

2) I understand that the OEM battery box is a pain but for now, I don't want to change it up. Can I put AGM batteries in there? I was reading that you cannot put AGM batteries in an enclosed space. However, I am thinking that this battery box is vented. Any thoughts?

Thanks,
Mike
AGM batteries still give off hydrogen, even though much less than a standard lead acid, so they need to be vented. Your OEM boxes use a natural draft ventilation drawing air in through holes in the bottom and out through that flex hose in the top that leads to the front vent through the exterior wall.

The AGM batteries I got from Sams for RV deep cycle (series 24) were actually shorter than the standard Insterstate battery the Redwood Dealer installed. I don't know about the 27 series. The 31 series are huge, and about 200lbs.
__________________
Brad & Dory - Lone Tree, CO
CURRENT - 2013 Itasca Meridian 42E/2013 Wrangler 4dr Sahara
SOLD - 2014 Redwood 36RL/2014 F350 DRW
atom ant is offline   Reply With Quote
Old 09-18-2018, 04:30 PM   #8
Senior Member
 
riciren's Avatar
 
Join Date: Nov 2014
Posts: 123
I currently have the Exide AGM battery in our FL model, it fits good in the original oem battery boxes. Have had them now 3 years now and I don't have an inverter.
__________________
2013 36FL, Winegard Trav'ler Dish 1000, Stacked W/D, Heat pump, Trailair Air Ride 5th Wheel Pin Box, 2016 3500 Ram Longhorn Edition Crew Cab 4x4, 50 gal auxilliary tank, 5000 Airlift bags, 26K Husky hitch
riciren is offline   Reply With Quote
Reply

Thread Tools
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


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Redwood RV or any of its affiliates. This is an independent, unofficial site.


All times are GMT +1. The time now is 02:18 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.