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Old 08-22-2015, 10:29 AM   #15
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X2 Ray. Separate the batteries for the circuit, then all you have is the normal 1-2% internal battery drain. Or installed a automotive post style cutoff switch if your unit does have a disconnect switch. I believe firmly in the KISS principle (KEEP IT SIMPLE S....).
Best of luck.

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Old 08-24-2015, 01:02 PM   #16
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A simple 5 or 10 watt solar panel should keep the batteries at full charge, assuming they are fully charged when you disconnect power. Also assuming that you are not running anything in the trailer.

Or as suggested, put a real cutoff switch on the battery and completely disconnect it from any circuits.

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Old 08-24-2015, 01:59 PM   #17
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Lots of good replies. Thanks everybody
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Old 08-24-2015, 04:17 PM   #18
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Even if you have a battery disconnect the internal leakage will discharge the batteries over time. A small solar maintainer will either slow down or stop the discharge without cooking the battery and without a power cord or controller. I'd use something like this:

15 Watt, 12 Volt Solar Panel

I might even disconnect that and check the battery voltage every week until I had a sense of how long it would sit and plug in the charger when the battery dropped to around 80% charge then plug the charger back in. It's a PITA but some time spent tracking discharge and charge will give you the clues you need to just do as needed. You could do that with or without the solar if you don't mind a cord for a day every month or two. If you live where it freezes it will be more of a problem when it is cold.
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Old 08-26-2015, 06:22 PM   #19
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I purchased a 100W solar panel and dual controller to keep the 4 - 12v house/chassis batteries charged. Cost me about $265 through Renolgy. Has worked great. We have a 39' Class 'A' DP
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Old 08-27-2015, 02:05 PM   #20
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Three options one may not apply.
First.. The one that may not: ON SOME Rv's the converter is a plug in model, this is both a blessing and a curse cause if it is.. It is the answer to your question. (Plug just the converter into an extension cord..NOTE you may need a modified extension cord (I DO, Mine is I have the proper adapter).

Second: Add a battery minder or battery tender and plug it in when at home. (or a small, (Smallest you can get) QuALITY 3 stage converter)

Option 3:
First: Get a small can or bottle of paint of finger polish (1 OZ is more than enough color RED (you may also wish to get a 2nd one BLACK)

Find the battery terminal marked with the + (POS) symbol or letters that has wires running off to who knows where (NOT to another battery)

PAint all wires and the area on the battery near the terminal RED (Spray works well if you like)

Optional black goes on the NEGATIVE terminal that runs off to who knows where

Now take a photo with your phone

Remove batteries to bench and use the battery minder there

NOTE: Always set batteries on a sacrifical surface like a piece of scrap plywood or a few layers of corograted paper.. NO this has nothing to do wiht protecting the batteries. but if there is any acid leakage.. Scrap lumber costs way less than whatever is below it.

Home is where I park it!
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