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01-19-2015, 11:33 AM
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#1
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Montana Fan
Join Date: Feb 2010
Location: St. Clair Shores
Posts: 389
M.O.C. #10151
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AGM Batteries... Opinion
Who's using AGM 12v batteries? What do you think of them? Would you buy them again? We're doing research on new batteries because our OEM battery is getting old and weaker.
Thanks in advance.
Walt
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01-19-2015, 12:33 PM
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#2
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Montana Master
Join Date: Feb 2005
Location: Haysville
Posts: 4,261
M.O.C. #3085
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All I can offer is they keep a charge better and last longer in my motorcycle.
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01-19-2015, 03:04 PM
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#3
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Montana Master
Join Date: Mar 2012
Location: Livingston
Posts: 1,150
M.O.C. #12333
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Walt,
If you can go with 2 - 6 volt AGM's and run them in a series configuration to get your 12 volts and you will get more amp hours with the 2 batteries as compared to one 12 volt. Search the Internet as there are many good ones. You would not need a battery box as the AGM's do not off gas. You will need extra 4/0 or 2/0 cables to run them together but they will be worth it!
__________________
Les and Sue Young, 2009 Int 4400 LP, 2020 DRV Mobile Suites [/url] https://ramblingrvrat.blogspot.com/2019/11/freedom-from-grid-rambling-rv-rats.html[/url]
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01-20-2015, 01:33 AM
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#4
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Montana Master
Join Date: Mar 2013
Location: Hanover
Posts: 1,471
M.O.C. #13325
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Unless you've money to burn, just replacing one 12v battery with a single 12v AGM won't get you any improvement. Also, only having your converter charging one or two quality AGM or flooded batteries won't let you get the life out of them that they should have. Converters don't charge at a high enough voltage to start with, only at one that won't overcharge if left plugged in for months. It's true AGMs don't outgas and you don't have to check fluid levels, but if you're going to spend the money, first look into how they'll be charging so you aren't wasting it.
By the by, our new/used Monty came with two 12v semi-deep cycle batteries. Someone added the second with 10 gauge cables, just jumping the second to the first. Didn't change either of the trailer connections so both would be equally sharing the load. Really pathetic job and one of the first things I fixed. There's previous posts on how to add a second battery or two 6v ones.
__________________
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01-20-2015, 03:21 AM
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#5
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Established Member
Join Date: Dec 2014
Location: Lufkin
Posts: 12
M.O.C. #15875
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Quote:
quote:Originally posted by WaltBennett
Unless you've money to burn, just replacing one 12v battery with a single 12v AGM won't get you any improvement. Also, only having your converter charging one or two quality AGM or flooded batteries won't let you get the life out of them that they should have. Converters don't charge at a high enough voltage to start with, only at one that won't overcharge if left plugged in for months. It's true AGMs don't outgas and you don't have to check fluid levels, but if you're going to spend the money, first look into how they'll be charging so you aren't wasting it.
By the by, our new/used Monty came with two 12v semi-deep cycle batteries. Someone added the second with 10 gauge cables, just jumping the second to the first. Didn't change either of the trailer connections so both would be equally sharing the load. Really pathetic job and one of the first things I fixed. There's previous posts on how to add a second battery or two 6v ones.
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I would think adding another 12 volt battery in parallel would be the way to go. What did you do to "fix" that? You didn't want the two batteries equally sharing the load? I'm curious as my new Monty came with two 12 batteries in parallel too. I thought it was for the refrigerator inverter.
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01-20-2015, 05:12 AM
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#6
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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Two 12's in parallel works when they are big honkers and appropriate cabling is used for the setup. And in that case, it's hard to lift one and they take up a lot of space. For normal group'd 12 vdc batts, more amphrs can be had with 6 vdc in series or parallel pairs of serial sixes. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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01-20-2015, 09:21 AM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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As stated above, we used two 12's for several years and then went to 6's. I would not go back to 12's.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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01-20-2015, 10:31 AM
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#8
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Montana Master
Join Date: Jul 2009
Location: Olympia
Posts: 1,058
M.O.C. #9441
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We have been running 6 ea. 6 volt AGM batterys for the last 1 1/2 months and I am liking them more and more each day. Since we are in Quatrzsite and have them tied to our solar system they seem to be quite stable when tied to our inverter... And I would buy them again...
__________________
2020 Ram 3500, 2022 Luxe 38GFB,2500w Solar with Victron equipment, Gen Y Pinbox
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01-21-2015, 12:50 AM
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#9
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Montana Master
Join Date: Mar 2013
Location: Hanover
Posts: 1,471
M.O.C. #13325
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Quote:
quote:Originally posted by wm5e
Quote:
quote:Originally posted by WaltBennett
Unless you've money to burn, just replacing one 12v battery with a single 12v AGM won't get you any improvement. Also, only having your converter charging one or two quality AGM or flooded batteries won't let you get the life out of them that they should have. Converters don't charge at a high enough voltage to start with, only at one that won't overcharge if left plugged in for months. It's true AGMs don't outgas and you don't have to check fluid levels, but if you're going to spend the money, first look into how they'll be charging so you aren't wasting it.
By the by, our new/used Monty came with two 12v semi-deep cycle batteries. Someone added the second with 10 gauge cables, just jumping the second to the first. Didn't change either of the trailer connections so both would be equally sharing the load. Really pathetic job and one of the first things I fixed. There's previous posts on how to add a second battery or two 6v ones.
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I would think adding another 12 volt battery in parallel would be the way to go. What did you do to "fix" that? You didn't want the two batteries equally sharing the load? I'm curious as my new Monty came with two 12 batteries in parallel too. I thought it was for the refrigerator inverter.
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Whoever installed the second battery before we bought it did it wrong. They just added the second w/10 gauge cables cut to fit next to the first and changed nothing else. Two batteries must be paralleled with at least 8 gauge and equal length cables between them and then connected one + from one battery and the - from the other for them to share the load and charge equally. Don't believe they came w/two from the factory unless Keystone had heard enough complaints to finally put a second in.
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01-23-2015, 01:25 PM
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#10
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Montana Master
Join Date: Jan 2009
Location: Centerville
Posts: 1,350
M.O.C. #9051
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Supposedly AGM batteries should be charged with a charger that has the AGM mode. I have a AGM battery that I use to run a electric trolling motor on an inflatable pontoon boat. Its been used now for four years, and gets run down pretty low on each usage . I have always charged it up with a charger with the AGM mode. The battery seems to be as strong as when new. It a size 24 .
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