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Old 08-02-2016, 12:20 PM   #1
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New Batteries & proper charging?

Prepping my Berk for a month long cross country.

The house batteries that I bought the coach with were older and in need of replacement. The Magnum MM charger, however had been continually boiling water off those batteries for the last few months as the coach was in storage. I spoke with Magnum a month ago and they insisted the unit should not be boiling off the batts, but that I needed to routinely de-sulfate my batteries. Frankly it wasn't worth doing with older batteries. Perhaps I'll be more diligent with the new ones.

So I removed the old batteries and the tray and realized how badly the compartment was messed up from the acid and gas. some good steel and brash brush work and some Naval Jelly later it was ready for an application of undercoating. Looks a lot better now

So now I have 4 new batteries as of this morning and I'm wondering how many users here leave their charger on and in float mode all the time? AS a note, I have kids in our BH model and its damn hot right now, so the genset is ON if were in the coach.
When your on a trip do you run them down and then recharge? and is there a constant 12V draw on the system or must the inverter function be on to draw those down?
I was surprised that when I cut the house batt switch that the Air Cons cut out. Seems there is DC control to units I thought werre entirely AC.

So to avoid cooking $750 worth of new batteries...should I let the charger do its thing or **** it off when its in float mode?
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Old 08-02-2016, 12:32 PM   #2
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"Read this" is the best advice I know...

The 12volt Side of Life (Part 1)
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Old 08-02-2016, 12:42 PM   #3
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My magnum runs all the time.
Plugged in at home, I run both fridges on ac while on the road.

After the float charge, when the batts are at 100%,the charger shuts down.
Maybe your old batts were never reaching 100%?


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Old 08-02-2016, 12:47 PM   #4
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Thanks!
Provide for some sort of charging to offset the batteries tendency to self-discharge. This can be provided by a small solar panel or trickle charger, or the converter or 3 stage charger in your RV. It is best to let the batteries discharge slightly over a few weeks or a month and then do a full recharge overnight. Trickle chargers and unregulated solar panels can slowly boil off electrolyte, or worse, fail to maintain the charge, allowing your batteries to become deeply discharged.


That is taken directly from the article. I think of my .5A battery tenders on my toys, that never seems to boil the water off. So this article, good as it is to read it again, just confirms what I knew already.

So to my question- what do the owners here do-real world experience? when your on the road and in storage, do you turn off the charger if your batteries are topped off OR let them float?

...and again, we seldom have the temperature/humidity opportunity in S. Florida to turn off 110V power (read HVAC) so the charger is pretty much 365 days a year
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Old 08-02-2016, 12:51 PM   #5
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Kenny,
That is interesting. With my old batteries: the led readout said 4/4, genset or shore power was on for the duration of the drive, get to camp and push out the slides....look at the magnum and its in Bulk just from the slides, though there is not audible strain and the extend/retract speeds seemed typical of what i know from 15 years of RV ownership and rentals. Then wake up the next morning and its still in Float, I never say float go off.

This could very well just be related to previously abused or just tired out batteries.
or is your charger more modern than mine from 2011?
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Old 08-02-2016, 12:52 PM   #6
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Once mine are charged I like to let them run down as possible to 12 volts then recharge. As I understand it this is best for the batteries.
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Old 08-02-2016, 01:14 PM   #7
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I use a small solar panel in the winter as I have no electric where I store the rig. I do not take action during the season to discharge the batteries, although I do run an auto generator start that cycles when the AC is needed in warm weather while dry camping. Typically, this results in the genny cycling off and on during the night, drawing the battery down when it's off. I do agree that the genny runs nearly non stop in the really hot weather during the day. I was at a couple of NASCAR races this year in dry camp mode, and the genny (and the charger) ran all day.

When on shore power, I do not modulate the battery usage. I do check that the charger is in float mode after some time hooked up, however. If not it's not, I usually check the water in the batteries to be sure that's not an issue.
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Old 08-02-2016, 02:36 PM   #8
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Quote:
Originally Posted by kohersh View Post
Prepping my Berk for a month long cross country.



The house batteries that I bought the coach with were older and in need of replacement. The Magnum MM charger, however had been continually boiling water off those batteries for the last few months as the coach was in storage. I spoke with Magnum a month ago and they insisted the unit should not be boiling off the batts, but that I needed to routinely de-sulfate my batteries. Frankly it wasn't worth doing with older batteries. Perhaps I'll be more diligent with the new ones.



So I removed the old batteries and the tray and realized how badly the compartment was messed up from the acid and gas. some good steel and brash brush work and some Naval Jelly later it was ready for an application of undercoating. Looks a lot better now



So now I have 4 new batteries as of this morning and I'm wondering how many users here leave their charger on and in float mode all the time? AS a note, I have kids in our BH model and its damn hot right now, so the genset is ON if were in the coach.

When your on a trip do you run them down and then recharge? and is there a constant 12V draw on the system or must the inverter function be on to draw those down?

I was surprised that when I cut the house batt switch that the Air Cons cut out. Seems there is DC control to units I thought werre entirely AC.



So to avoid cooking $750 worth of new batteries...should I let the charger do its thing or **** it off when its in float mode?

What control are you using to charge the batteries. If it the one that came with the Moho it's time to upgrade. I had a issue with the old controller and it ruined 4 batteries. This is the one you want. It allows you to set the charge rate and much more. It is plug and play so a easy instal.
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Old 08-02-2016, 03:06 PM   #9
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What's that one, the MM ARC 50?


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Old 08-02-2016, 04:15 PM   #10
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Do you run your generator or connect to shore power when you put jacks down/slides out? I do so whenever I put jacks/slides out and that way it doesn't run down the batteries. Believe it or not it takes a good amount of power to put jacks down and the slides out.
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