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Old 11-30-2014, 06:27 PM   #1
Artemus Gordon
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Battery experts please help!

Battery Experts! Help!

Last month I went from 12 volt to two six volt AGM batteries wired in tandem. Here in lies the problem. After full charge and minimum use, my gauge goes down and reads 1 Bar. Yet I can still run 12 volt TV and lights for hours. Did the switch from 12 to 6 volt batteries effect the battery monitor? It's all original factory converter ( 90 Amp )charger offered in 2012 Montana 3750. Previously when monitor went to one bar, I was running on fumes. Note: during charging the monitor reads charging and four bars after shore power or generator is turned off! Please advise, thank you.
 
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Old 12-01-2014, 12:47 AM   #2
jlb27537
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I would suggest you get a real battery monitor. I would also suggest you look into the charging requirements of AGM batteries. Flooded batteries and AGM batteries usually require different charging strategies.

You wired them in tandem??? they should be in series.

http://www.bogartengineering.com/products/TriMetric

http://batteryuniversity.com/learn/a..._glass_mat_agm

Jim
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Old 12-01-2014, 01:17 AM   #3
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Jim gave good advice, here is another page with cartoons. It always helps me when I have pictures.

https://www.survivalmonkey.com/threa...arallel.37039/





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Old 12-01-2014, 04:20 AM   #4
DQDick
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I tried AGM batteries with my original converter/charger and it wouldn't charge them correctly. Of course I have an older rig so my experience could be different. Had to wait till I went solar and dropped the original converter altogether before I could go AGM.
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Old 12-01-2014, 07:51 AM   #5
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At the Fall Rally, I believe I heard the fellow from Progressive Dynamics say that the current systems being installed, (which is what were installed in 2012 units), were capable of maintaining standard flooded cell and AGM batteries. The Gel type batteries needed a modified charger system. As long as you have 6 volt batteries in SERIES, (not tandem, wrong terminology), or 12 volt batteries in PARALLEL, you should be OK. You might want to check the reverse polarity fuses, that they are all good, just in case you blew a fuse when installing the new batteries. You could also call Progressive Dynamics customer service for help 269-781-4241.
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Old 12-01-2014, 09:24 AM   #6
Artemus Gordon
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I meant series, wrong words! Thanks everyone.
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Old 12-01-2014, 09:50 AM   #7
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You need to get the scoop on your AGM's and what they take to charge. There are specific charging requirements including time in Bulk, Absorb and Float charging in order for your batteries to get fully charged and stay charged above 50%. Jim is spot on with a good monitor so you know when you batteries are getting taxed near 50%. If you never get your batteries fully charged and are constantly running them down to 50% or worse, the converter will not be enough to keep them charged. That converter is always going to be running trying to catch the batteries up.

AGM's need a good Equalization charge after about 20 to 30 discharges depending on the make and the converter will not do that.

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Old 12-01-2014, 05:47 PM   #8
Artemus Gordon
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I am going to find help locally. You guys are great! I love the MOC. Thanks! When your over your head, you seek out help!!! I have to share. I have an "Interstate" battery store 1/2 mile from home. They gave me "zero" info! I got more in last two days from MOC, then I got in two week! Heart felt thank you !
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Old 12-02-2014, 03:23 AM   #9
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Art, You might not know it, but the level-up control panel has a battery voltage reading function. You might monitor that and see what your actual voltages are. The bars, unless you know what voltage each bars represent, are useless.

Also, your converter, if like mine, has a mode button on the ckt board. When you open the plastic door that hides the fuses and ckt breakers there will be a led that will indicate what mode the converter is charging in. You can manually place the converter in different charge modes. Yours may be stuck in float? which will not charge a AGM

Just a thought.

Jim
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Old 12-02-2014, 11:19 AM   #10
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First off, go to your battery manufacturer's web site and look up what THEY say charging voltages & current should be. Second, get a Triminic battery monitor with shunt and install it to see what kind of voltage your converter is putting into your batteries AT THE BATTERIES. The big issue with converters is that they are designed to not overcharge anything, and that means they usually don't put out enough voltage to really charge in the first place. While I like Progressive, I wouldn't just go by what some sales rep says for any product of any company.
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Old 12-02-2014, 12:39 PM   #11
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Quote:
quote:Originally posted by DQDick

I tried AGM batteries with my original converter/charger and it wouldn't charge them correctly. Of course I have an older rig so my experience could be different. Had to wait till I went solar and dropped the original converter altogether before I could go AGM.
It takes a special converter/charger or inverter/charger for AGM batteries. The OEM converter/chargers in Montanas will not work.
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