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Old 03-30-2016, 03:36 AM   #1
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Battery disconnect or leave plugged in?

How should the trailer be left when not being used for weeks/months? I can install a battery disconnect (or do I need two?) or can leave it plugged into 110v. Are either of these better for prolonging the life of the batteries?
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Old 03-30-2016, 04:50 AM   #2
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Quote:
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How should the trailer be left when not being used for weeks/months? I can install a battery disconnect (or do I need two?) or can leave it plugged into 110v. Are either of these better for prolonging the life of the batteries?

Hello and welcome to the forum!!
I like to keep my batteries/rig plugged in.
Keeps the batteries warm and toasty. Just need to check water level in house batteries every few months and refill as needed with distilled water
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Old 03-30-2016, 05:02 AM   #3
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Hello and welcome to the forum!!
I like to keep my batteries/rig plugged in.
Keeps the batteries warm and toasty. Just need to check water level in house batteries every few months and refill as needed with distilled water
Are you saying that typically some juice is going to the battery when the 110 power is plugged in? I had thought the battery juice is only one way. Just curious... I leave mine plugged it also... mainly because it is locked inside a compartment behind my two gas tanks. So yes, I have to completely remove both tanks to get to the battery. Really dumb design for efficiency, but on the other hand the battery shouldn't need servicing that often. jmo
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Old 03-30-2016, 05:26 AM   #4
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If you have a converter (most do to run 12v while 110v is plugged in), your battery is being charged off of the 12v system. Yes. So keeping the RV plugged in will charge the battery.
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Old 03-30-2016, 06:45 AM   #5
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If you have a converter (most do to run 12v while 110v is plugged in), your battery is being charged off of the 12v system. Yes. So keeping the RV plugged in will charge the battery.

Correct, the easiest way to check is to see the readout for the battery anything over 13.5 or so will mean the converter is charging the house and chassis batteries
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Old 03-30-2016, 10:45 AM   #6
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If it's going to be unattended/unmonitored for months, I'd recommend either disconnect it or a dedicated low amp "float charger". Why? Just had my deep cycle battery fail and begin to boil out. Caught it when I smelled the stink of hydrogen sulfide gas. Would anything catastrophic happened if I hadn't caught it--I don't know but I don't want to find out. But that's just me....
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Old 03-30-2016, 11:25 AM   #7
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Curb71-

If you leave the trailer plugged into 120V, you have two poor outcomes and one positive outcome:

Positive: Everything works correctly and the batteries stay charged
Poor 1: Power fails, and the batteries run down due to parasitic loads
Poor 2: Converter fails, overcharging batteries

Both Poor 1 and Poor 2 will ultimately (in some cases quickly) ruin your batteries.

If you disconnect your batteries completely, having charged them to full first, you have no poor outcomes.

Me, I keep the coach connected and charging in advance of a trip. If it's going to sit awhile, I completely disconnect the batteries.

Your choice.
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Old 03-30-2016, 07:00 PM   #8
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Interesting. So if I choose to install a disconnect do I need to install 2 as I have 2 deep cycle batteries? A couple of these? https://www.amazon.com/dp/B001N729FS..._qGg.wbHXEVGT2
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Old 03-30-2016, 07:02 PM   #9
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Seems like if it's going to sit for a few months the only downside of a disconnect is having to set the clock on the microwave ��
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Old 03-30-2016, 07:05 PM   #10
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1. Fully charge the batteries prior storage. Adjust battery fluid level to max.

2. Disconnect the negative lead at the battery that is connected to chassis ground. You want the batteries connected together, but not connected to the rig. No cut off switches are needed. I do not like them because they can fail.

3. Connect a maintainer to the batteries. The on-board converter/chargers can overcharge the batteries and ruin them. Maintainers cannot.

I lost 3 new batteries in storage because an "Excellent Brand" 4 stage converter boiled them. Never again.

Good maintainer here:

Robot Check
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Old 03-30-2016, 07:07 PM   #11
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Curb71-

I assume you are speaking about house batteries, and that they have a single ground to the chassis. If so, put the disconnect there, or go without a disconnect and simply lift the cable off the battery post and set it aside.
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Old 03-30-2016, 07:10 PM   #12
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Seems like if it's going to sit for a few months the only downside of a disconnect is having to set the clock on the microwave ��
Curb71-

Your microwave runs on 120V, not 12V. Disconnecting the batteries does not affect it in any way.
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Old 03-30-2016, 07:21 PM   #13
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Which brings up another item. I do not leave the rig connected to 120 volts via the shore power input during storage. Power supply problems (Spikes, sag, high/low voltage, etc.) can damage 120 volt equipment in the rig and at the worst start a fire.

I connect my maintainer to a shore supply with a regular outdoor extension cord. Worst that can happen is to smoke the maintainer.
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Old 03-31-2016, 09:42 AM   #14
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I disconnect the battery when stored and if in a place with power I leave a float charger on the battery
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