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Old 11-09-2017, 07:08 AM   #1
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Chassis and coach battery switch

While in storage during the winter I have turned off the chassis and coach battery switches, how long can these be turned off before there is battery damage, should I keep it (MH) hooked up to shore power for the winter. Just want to know the best way to keep my batteries in top shape.
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Old 11-09-2017, 07:13 AM   #2
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Our coach is stored in an unheated barn. I plug it in to 50 amps and leave the Salesman Switch engaged. If you were plugged into a camp site in the south and living in it that's how it would be, so I can't see how that will hurt anything.

I go out almost weekly and check things out.
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Old 11-09-2017, 02:12 PM   #3
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If the battery disconnect switches are turned off then I don't see any way the battery can be damaged, EXCEPT from freezing!
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Old 11-09-2017, 06:03 PM   #4
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- If the coach is plugged in and has decent batteries and charging system the switches can be off almost indefinitely. Check occasionally to make sure the power is on (especially after big storms).
- If the coach is not plugged in, and if the batteries are not in good shape, the batteries will need attention regularly (could be anywhere from a couple of weeks to a month or more). Remember the constant parasitic loads on a battery even with the battery switch off

- An alternative is to fully charge the batteries, then disconnect the battery negative terminal. That will eliminate the parasitic loss and extend the battery sitting time.
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Old 11-11-2017, 08:14 PM   #5
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you didn't say what kind of batteries you have assuming those are lead-acid type. it's known that rv house batteries have parasitic loads, such as co detector and live electronic boards; and the characteristcs of la self depletion rate at about 5% per month. those batteries will drop to below than 50% soc before the end of winter season if you just leave them there without doing anything. the best way is to plug your rv to shore power and be good with it.
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Old 11-12-2017, 04:34 AM   #6
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Quote:
Originally Posted by Lv2Roam2 View Post
- If the coach is plugged in and has decent batteries and charging system the switches can be off almost indefinitely. Check occasionally to make sure the power is on (especially after big storms).
- If the coach is not plugged in, and if the batteries are not in good shape, the batteries will need attention regularly (could be anywhere from a couple of weeks to a month or more). Remember the constant parasitic loads on a battery even with the battery switch off

- An alternative is to fully charge the batteries, then disconnect the battery negative terminal. That will eliminate the parasitic loss and extend the battery sitting time.
In my rig turning off the battery switch is exactly the same thing as disconnecting the positive terminal.

How could there be a parasitic load if the battery is disconnected?

Do some coaches not disconnect the batteries when the switch is off?
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Old 11-12-2017, 04:57 AM   #7
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Quote:
Originally Posted by Lv2Roam2 View Post
- An alternative is to fully charge the batteries, then disconnect the battery negative terminal. That will eliminate the parasitic loss and extend the battery sitting time.
This is the best answer.

A healthy battery, fully-charged, with ground lead disconnected, should last through storage without attention or problems.

If the ground lead is not disconnected, the loads that are not run through the disconnect switch will drain it. Such loads on the house batteries are common (CO/LP detector, radio memory, reefer controls, system heat, etc.); many people are not aware of them until they find the batteries discharged with the disconnect switch off. There can be similar loads on the chassis battery side.

I have 50A shore power to the coach storage next to my house. Despite that, I prefer not to supply electricity to the coach during long periods of storage. Less "wear" on the components, no exposure to power outages, and not having to pay for the electricity are some of the reasons. Some will decide differently.
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Old 11-12-2017, 07:03 AM   #8
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My MH and boat both have some loads tgat are not disconnected w the switch.
My MH has 2 pos leads... one switched w most of the loads other low A but still provides some power for gauges...memories...etc

Others do cut it off completely...you have to confirm which you might have
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