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Old 03-07-2015, 05:22 PM   #1
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Parasitic draw on battery

MRB 20 Manual says not to leave it plugged in all the time while in storage or batt may get overcharged. But after a couple weeks unplugged, batt goes dead. No, brakes aren't on. Nothing is on. Other than co alarm. I figure all parasitic draw should be maybe .5A, but it's 7.5A! Pulled fuses one by one and found the 30A fuse labelled "Charge line, slide motor" is the culprit. With that fuse pulled, the draw is only about .5A. I wouldn't think the slide motor would do it.Can anyone tell me why the charger would?

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Old 03-07-2015, 05:56 PM   #2
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I have been leaving mine plugged in for 5 years now and it has never over charged the battery, which is original and the water is still full. These newer units are equipped with smart chargers that do not overcharge the battery. As for the parasitic draws, not sure about the usual amp draw numbers ( 7.5 amps is a lot, would that suggest a short?) but most owners report that after a week or two these draws will kill the battery if it is not disconnected. This has happened to me with this trailer and my previous one when forgetting to disconnect the battery if not connected to shore power.


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Old 03-07-2015, 06:08 PM   #3
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well I know the radio light in ours stays on .. I don't know how much it takes but if mine is sitting my battery is disconnected
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Old 03-08-2015, 06:25 AM   #4
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The electronics inside the converter/charger, it keeps track of the battery whether using shore power or not. There is probably a relay or diode set inside.
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Old 03-08-2015, 07:24 AM   #5
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I left my antenna booster once once and in a few weeks the battery was dead. Now I disconnect the negative post on the battery when I put it in storage.

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Old 03-08-2015, 07:31 AM   #6
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My rig is always plugged in to something. The only time was this year I left it at a dealer for some work and in 3 weeks both batteries were dead and would not recharge.

I added a battery disconnect switch after that.
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Old 03-08-2015, 08:09 AM   #7
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Living here in rural MN, I learned long ago that when I store seasonal equip such as lawn tractor, corvette, etc. it pays to remove the battery completely and keep a small charger on them throughout the winter. Batteries last much longer, and I always have a fully charged battery when I'm ready to work or play.
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Old 03-08-2015, 08:11 AM   #8
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I always leave mine plugged in as well. I will check the water level on the battery every month to make sure it is good. But as Crabman stated the new campers are equiped with smart chargers and you shouldn't have a problem.
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Old 03-08-2015, 09:27 AM   #9
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yeah that got me to thinking ... I bet mine is killed from setting at the dealer all winter for warranty work ... I would be willing to bet they didn't disconnect it or take it out ... so now I have to replace it if that's the case ... that would sort of bite
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Old 03-08-2015, 09:30 AM   #10
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I don't know about over charging the battery. I pull the 30 amp fuse at the battery. Then the battery is fully disconnected from the tt. A disconnect switch will do the same thing.

There are a lot of parasite draws on the battery. A clamp on amp meter should help see what is happening.

Question about battery health, you do not say what you have for a camper or year. Deep cycle batteries need maintenance. You need to check the cells for water level every few months. If water is needed ONLY use DISTILLED water, and only fill to the bottom of the plastic insert.

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