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Old 10-07-2013, 06:16 PM   #1
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Chassis Battery Drain Question

When I have everything turned off (everything that can be turned off), my chassis battery is drawing ~160mA. Is this a normal amount? If so, how long should my chassis battery last. Is ~two weeks a normal amount of time for the chassis battery to last without use? I have a blade switch that completely isolates this battery. I will begin using this, but was wondering if the current draw and length of time to drain is normal.
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Old 10-07-2013, 07:01 PM   #2
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Location: Silver Springs, FL. USA
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Yes, that amount is pretty much normal. The engine ECM draws some to stay awake, and you probably have a few things wired direct to the chassis battery as well, e.g. the entry step (an RVIA safety standard).
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 10-08-2013, 06:48 AM   #3
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If you park the motorhome outside, one of those small battery maintainer solar panels placed on the dash and plugged into an outlet supplied by the chassis battery should work for you.
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Old 10-08-2013, 03:59 PM   #4
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Location: Palisade CO
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Mine runs about the same and the chassis battery will last about three weeks.
I use a BatteryMinder Plus which is a float charger and can be left on all the time without harming the battery. I used to unplug when I started the engine but their customer service tech said that wasn't necessary. The starting voltage transients won't hurt it - it is designed to withstand them.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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Old 10-08-2013, 04:50 PM   #5
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Location: Clovis, CA, USA
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That's about normal.

I use my battery disconnect switch when the coach isn't being used.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
U.S.Gear Braking System
Failure to plan on your part does not constitute an emergency on my part.
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Old 10-13-2013, 09:02 PM   #6
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I camped for two weeks in October,when I tried to start engine ,it would start. Coach batteries were good, battery boost did nothing. Had to replace chassis battery, camping world were nice to replace it. I will need to start engine some while camping, attach trickle charge, add battery disconnect or a combination of things. I am just new to mh, I have a lot to learn.
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battery, chassis

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