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Old 09-23-2013, 05:45 PM   #1
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Location: Jackson,Mi
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Maintenance charger help

I always use a maintenance charger on my vehicles while not in use. Now we have a class A motorhome with 4 6-volt house batteries and 2 -12volt chassis batteries. I have two questions

1. Will a single maintenance charger maintain the two chassis batteries wired in parallel or do I needed to separate the batteries and use two chargers?

2. Will the maintenance chargers I use on car batteries maintain deep cycle batteries? 2 6-volt in series which are in parallel with 2 more 6-volt in series.

Thanks in advance for any help you can share.

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Old 09-23-2013, 06:49 PM   #2
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Since the maintenance chargers require 120vac to work, why don't you just plug the mh into that and let the mh's on-board charger keep the batteries charged?

However, to answer your questions:
1. Yes, a single charger will keep both batteries charged..no need to separate.
2. Yes, the same charger will work on multiple batteries.

However, keep in mind that maintenance chargers are typically very low amperage and if the batteries are not fully charged when you connect the maintenance charger, the charger may not have sufficient amperage to bring the batteries back up to a full charge.

If you are connected to shore power and your on-board charger keeps your house batteries charged but not your chassis batteries, invest in a little device called a "Trik-l-start". It does not require 120vac to work and will enable your on-board charger to keep ALL your batteries fully charged.

Hope this helps


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Old 09-23-2013, 08:04 PM   #3
Join Date: Aug 2013
Posts: 53
Also keep in mind that not all battery chargers are alike.
Depending on the manf., some batteries need to be charged at higher than typicaly thought of voltage. Trojan's as an example need 14.8V to keep them fully charged which keep's them going for years. Visit the manf., to get the correct charging voltage.

Another website that will help you is HandyBob's Blog Making off grid RV electrical systems work, lots of good info.
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Old 09-23-2013, 08:47 PM   #4
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I am planning on purchasing the Amp-L-Start, 15 amp version of Trik-L-Start. These maintain chassis battery from house battery bank that is being charged by your charger/inverter (or converter) while on shore power (or generator). If wanting a AC charger then you might consider one of the many float chargers.
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