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Old 06-28-2014, 05:02 PM   #1
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House Battery Dead in One Week

I'm not sure if this is typical or not, but I went out to our 1995 Minnie Winnie a few minutes ago, and the house (deep cycle) battery was dead, not enough power to even power the lights. It worked fine last weekend with no issues. The battery is a single group 27 Interstate brand deep cycle.

Obviously I need to charge it up, but it seems odd to go dead in a week. I'm going to go look for switches left on, etc, but any ideas?
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Old 06-28-2014, 05:06 PM   #2
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How old is the battery and do you have a cut off switch so you can "disconnect" it when stored?

Even small parasitic loads can run down an older battery in a few days.

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Old 06-28-2014, 08:41 PM   #3
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There isn't a date marker on any of the sides of the battery, but it's labeled on the top as installed in the unit on 5/25/14 from the dealer. There isn't a cut off switch, but it isn't that difficult to disconnect the ground lead when the coach isn't in use.

I'm thinking that disconnecting the ground lead is the way to go, but on the same note how long does it (typically) take the generator (Onan 4000) to bring the battery up to full charge again?
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Old 06-28-2014, 08:54 PM   #4
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Your carbon monoxide detector in the MH will drain the battery after a few days.
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Old 06-28-2014, 08:56 PM   #5
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There isn't a date marker on any of the sides of the battery, but it's labeled on the top as installed in the unit on 5/25/14 from the dealer. There isn't a cut off switch, but it isn't that difficult to disconnect the ground lead when the coach isn't in use.

I'm thinking that disconnecting the ground lead is the way to go, but on the same note how long does it (typically) take the generator (Onan 4000) to bring the battery up to full charge again?
The generator usually charges the house battery via the charger/converter in a few hours hours or so. Its only a 30 or 40 amp charger in the smaller coaches so it will take some time.
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Old 06-29-2014, 10:54 PM   #6
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Good news, yes you can use the generator to charge the batteries; BAD news, if the battery is already dead then you will not be able to start the generator because the house battery is DEAD.
your best bet is to get one of those Battery quick disconnect switches to place on the negative post. It will make it much easier to open circuit it vise disconnecting it every time.
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Old 06-29-2014, 11:11 PM   #7
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I'm thinking that disconnecting the ground lead is the way to go, but on the same note how long does it (typically) take the generator (Onan 4000) to bring the battery up to full charge again?
Best to slow charge a totally dead battery for 48 hrs. at 5 amps or so.
I agree with installing a disconnect in the negative cable , I use a NASCAR style , with an attached plastic key, for quick disconnect of my toad battery. $5 at Auto Zone rated at 1000 amps 4 years no issues. Flick of the wrist , no wrenches.
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Old 06-29-2014, 11:12 PM   #8
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also ch for refig door heater as they are 12 v & big draw usually a little switch in freezer where door closes on top
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Old 06-30-2014, 07:57 AM   #9
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Do your storage bays have cargo lights in them? Mine are very easy to bump on when putting things in or taking them out after a trip and difficult to see during the day. Having just one of them left on by accident will drain a battery in a day or two
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Old 06-30-2014, 06:36 PM   #10
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Thanks everyone, great tips and ideas!
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