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Old 10-17-2018, 03:47 PM   #1
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Battery Disconnect - when do I use it?

We just took delivery of our new Flying Cloud FB30 Bunk (The Steely Dan!). Already went out for a weekend and love it. No major issues. My question is when do I use the battery Disconnect switch. I do have twin solar panels factory installed. I assume I would disconnect when in long-term storage (though solar panels may keep batteries charged anyway). What about when I am not suing the camper for 2-4 weeks? Disconnect or let the solars recharge the parasitic drain? Any other times that I should use the disconnect?
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Old 10-17-2018, 03:59 PM   #2
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Always turn the battery disconnect switch off when you are storing your trailer. Short or long term.
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Old 10-17-2018, 04:34 PM   #3
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You will always have parasitic drain as long as the batteries are hooked (wired) up. If you don’t use the disconnect switch, you will have a greater amount of parasitic load.

I always use the disconnect switch any time I don’t need power. Because I am storing the trailer under cover, and I don’t get sun on the solar panel, for no use longer than a few days, I disconnect the ground wires to the batteries.
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Old 10-17-2018, 04:35 PM   #4
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What does your owner's manual have to say?

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Old 10-18-2018, 11:24 AM   #5
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Answers above are fine for the conditions they describe.

I store my trailer with a shore power hookup and run AC to prevent mold which grows in our high humidity. So, the only time I hit the "store" switch is if I'm working on the 12 volt system and want it deenergized. I'm probably in the minority (ok... lunatic fringe) with that approach, but it works for me.
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Old 10-18-2018, 02:56 PM   #6
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More on Battery disconnect?

Seems to me???? Anytime I have shore power, disconnect? Mine is a FC 25.
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Old 10-18-2018, 11:00 PM   #7
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Welcome Aboard!! 👍

I installed a switch that actually disconnects the battery. Our batteries are in separate compartments in the Classic and it's much easier this way for Winter Storage.

Bob
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Old 10-19-2018, 09:20 AM   #8
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I only use the battery disconnect when dropping the trailer off at the dealer for service. However, I replaced the POS battery killing Parallax converter for a Progressive Dynamics PD4655V before I even took the trailer out camping the first time, and I have a 50/30/20 pedestal at home where I store the trailer, so I can leave it plugged in all the time. I let the Progressive Dynamics converter take care of the batteries for me.

(However, I am in the process of installing a 200 amp latching relay to disconnect the inverter from the battery. THAT one I will keep disconnected at all times except when we are boondocking and want the TV/DVD player to work.)
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Old 10-19-2018, 10:40 AM   #9
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Quote:
Originally Posted by Rob Cope View Post
Seems to me???? Anytime I have shore power, disconnect? Mine is a FC 25.
I have shore power at home also...the AS is never plugged in unless the batt's need charging.
Even with a 'smart' 4 stage converter I see no need unless its needed. 🤓
I can ck status from the living room.

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Old 10-19-2018, 01:45 PM   #10
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Old 10-21-2018, 09:59 AM   #11
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If you store the trailer outside, as you have solar, there's no need to disconnect. The solar will tender the Batts nicely.

I do the same. I never even put the trailer in store. It's always on and ready to go.
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Old 10-21-2018, 10:59 AM   #12
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Ditto. I just have to check water level in my batteries, dry desert air tends to evaporate some water from my GC-2 batteries.
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Old 10-21-2018, 12:59 PM   #13
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Do you mean a hard disconnect switch or the little one in the trailer by the front door? The battery will still be charged by the solar panels even if you switch off the one by the front door (which I also keep off when I'm on shore power, but switch on when I'm doing something in the trailer while it is stored or before we get to the campground).
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Old 10-21-2018, 01:20 PM   #14
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Ditto. I just have to check water level in my batteries, dry desert air tends to evaporate some water from my GC-2 batteries.
Yup, I do the same. Always a good practice to check water levels, at least annually. It's basic maintenance and very easy after learning to how do it once.

Funny, because most look at this as a con. It's actually a great feature that they can be watered.

Batts such as AGM and Gel are advertised as "sealed", yet they are also technically known as valve-regulated lead-acid (VRLA) batteries. They can and will dry out with long term hard use. Yet they cannot be prolonged by watering.

For all those so worried about their converter chargers. People have been using them successfully for DECADES, with healthy long lasting batts. Just simple watering will do your battery good.
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