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Old 06-23-2015, 11:04 AM   #1
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Battery Cut Off Switch - are they necessary???


My trailer sits for several weeks between uses and I usually leave it plugged into shore power. Do I need a battery cut off switch or should I just leave well enough alone? If I do use a cut off, can I unplug it from shore power? I've heard that keeping it plugged in can damage the . Not very mechanical when it comes to electricity, so I would appreciate your help.
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Old 06-23-2015, 11:23 AM   #2
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If you have shore power, you will not need a battery cut off switch to disconnect the battery. Your converter will keep the battery charged, your 12v CO alarm, and other 12v stuff (radio) powered up. You should check the battery water periodically to be sure it does not get too low.

If you do install a battery cut off switch, yes you can unplug the shore power.
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Old 06-23-2015, 11:24 AM   #3
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If you are leaving it plugged in, the a cutoff switch puts you in the "belt and suspenders" class.


The converter's battery charger will keep your battery on Float Charge and keep the parasite loads powered separately.


If the power grid goes down, then your battery will be called upon for the duration of the blackout.


I keep my trailer plugged in while not camping. No cutoff switch.
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Old 06-23-2015, 11:24 AM   #4
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I dont have a battery cut off switch as I leave mine pluged into shore power when not in use . If I could not plug into power I would have a battery cut off switch.
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Old 06-23-2015, 11:40 AM   #5
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In between trips I don't have access to power, so I installed a cut off switch. A simple and inexpensive modification.
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Old 06-24-2015, 11:43 AM   #6
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Not meaning to hj, but doesn't disconnecting the neg. accomplish the same thing the disconnect switch does?
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Old 06-24-2015, 11:53 AM   #7
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Quote:
Originally Posted by cekkk View Post
Not meaning to hj, but doesn't disconnecting the neg. accomplish the same thing the disconnect switch does?
It's the other way around. Disconnecting 1 wire disconnects the battery from the RV. Exactly what you want to do when shore power is unavailable and you are not using the RV.

A disconnect switch accomplishes the same thing in a no tools, no mess fashion. And reconnection faster and easier as well.
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Old 06-24-2015, 11:56 AM   #8
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Thanks, Mike. That's what I meant.
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Old 06-24-2015, 12:00 PM   #9
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Yes. But, removing and reattaching the battery cable is not as 'quick and clean' usually. Some electronics don't like the intermittent connection when messing with the cables.
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Old 06-24-2015, 12:03 PM   #10
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I have a disconnect switch but for those who don't and don't want to spend the money, I was thinking that removing a cable would help and it's free.
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