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Old 08-02-2019, 09:28 AM   #1
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Battery Switches During Storage 2019 Southwind

Plugged into 110V during storage. Do you leave the battery switches on to keep batteries topped off, or can you turn them off and you still get them charging. Magnum shows they are charging when switches off. My friend who has a 2018 Newmar says he never turns his battery switches off when plugged into 110.
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Old 08-02-2019, 10:09 AM   #2
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The switchs typically don't switch off the inverter/charger cables, so the house will charge.
If the chassis switch completely disconnects every cable to the battery, you may not get a maintance charge to it, but you shouldn't need it for a few months of storage.
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Old 08-07-2019, 10:19 AM   #3
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Lead acid batteries prefer to be FULLY charged ALL the time.
If you are fortunate enough to have shore power at your storage place leave the battery switches alone and plug it in. No need to turn them off.
If turned off and no shore power there are still some small loads on (like the propane detector, radio memory, etc) that will kill the battery over time (Main/chassis). It took about 3 weeks for mine to end up being dead on my '16 Bounder.
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Old 08-07-2019, 10:57 AM   #4
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What to do, what to do.

We left in mid-May on a two month trip to the other side of the US in the Flair. I debated before leaving whether to leave the Monaco plugged in or not. The batteries, two group 4D Interstates, were new in '17. I finally decided to leave it plugged in. When we got back both batteries were cooked and battery acid was all over the inside of the battery compartment doing it's dirty work.

It is my thought that during very warm weather lead acid batteries will evaporate a considerable amount of water while being charged. I'm not certain if that is what happened in this case, or if a cell failed accelerating the whole process, but I will have to replace both batteries. It would be good to check the batteries occasionally when left on a charger for any length of time. I usually do this, but I was too far away.

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Old 08-07-2019, 02:38 PM   #5
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If I understand correctly, most of the newer motor homes have a three stage charger built into the converter. When the unit is plugged in it goes into a float mode and trickle charges the batteries as needed monitoring them automatically.

In the older models without the float charger if the unit is left plugged in the batteries can fry so the cutout switch should be turned off and batteries disconnected or a battery tender attached for extended storage.

This was the case on my 1996 and 2000 but the 2006 and 2018 models had the float chargers and I never had a problem keeping the RV plugged in.
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