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Old 08-15-2011, 09:37 PM   #1
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Battery question ???

I've got my motorhome in the garage and plugged into shorepower. I just checked the chassis and house batteries and they are fully charged. Should I flip the switch to disconnect both sets of batteries or just leave them alone?
I only ask this because the battery store owner that I purchased my AGM's from said do not over charge or let them get hot, because that decreases the life of the battery.
I have noticed that after checking my batteries over the course of a year or so that my batteries are warm/hot and I periodically hear them bubbling when walking by the bus. Just wondering ....

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Old 08-16-2011, 02:28 AM   #2
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The answer will depend on the charging system. What charges the banks? Do both banks recharge from shore and generator power? Please give us detailed info; make and model of everything. Thanks.

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Old 08-16-2011, 08:17 AM   #3
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It depends on the type of charging system you have. Even a 2005 42' Monoco Signiture series has a fairly high end electrical setup using a Trace inverter/charger with auto-generator start up. Later models would only have the latest inverter/charger models available.
The Trace unit is a 3 stage charging device and should revert to the float mode to maintain the batteries. I would also not be suprised if you also had a seperate BIRD system that allows the Trace unit to charge the chassis battery (a BIRD system automatically X-connects the chassi/house systems based on charging voltage on either side).
However, you said it was also boiling the batteries which could be a concern. You need to make sure the water level is not being boiled away. That will kill the batteries if water level is boiled off to low. That could possibly be a sign of a defective Trace unit (over charging the battey bank). Even so, devices like the auto steps or LP gas detector pull a constant drain on the batteries (ghost loads) so, the Trace unit would automatically come out of Float mode and recharge the battery due to those drains. To many ghost loads and the system may be cycling far to often and needlessly overstreessing the battery and charging system. What you have to be careful of if you use the Battery disconnect is, you have to determine if Monaco placed ghost loads on the battery side of the switch (auto step, keyless entry, LP detectector, etc.). They would still pull your battery down with the battery disconnected. It helps to know exactly how your system is designed in order to effectively keep it healthy.

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Old 08-16-2011, 12:20 PM   #4
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These chsrging systems are adjustable, thru software.
The magnum in my knight is. It's possible to likely. That it isn't set to the correct charging vo?ltages for agm batteries.

Find the tech support number for the charger manufacturer, they will walk u thru making the correct settings.
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Old 08-16-2011, 12:21 PM   #5
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Dave she has AGM batteries, sealed. The coach charger should have either an automatic or a mechanical switch for an AGM setup. If it is set up for lead acid that may be your problem. If you can't find the charger manual go online and find it and see how yours is set up. AGM, Gel and lead acid batteries are all charged differently as I understand it.
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Old 08-16-2011, 12:23 PM   #6
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When in doubt -- disconnect the battery -- no downside.
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Old 08-16-2011, 01:37 PM   #7
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Never messed with AGM batteries but I didn't think that type of battery could boil/bubble like the OP is saying his are.

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Old 08-16-2011, 01:57 PM   #8
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AGM batteries do have liquid in them, thus they can boil/bubble, however the liquid is soaked into a fiberglass cloth (Glass mat the "GM" part of AGM) and thus SHOULD not boil unless the batteries are being overcharged, exactly as the store clerk said not to.

Do call the converter customer support and get the correct settings for AGM.

I'm not that keen on AGM's as I fail to see any major benefit over standard Maintenance Free.. However that said. Hard to find Deep Cycle Maintenance free. Easier to find Deep Cycle AGM.

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