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Old 07-01-2015, 10:30 PM   #1
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2015 25' Flying Cloud
Eugene , Oregon
Join Date: Jun 2015
Posts: 53
Battery Drain During Storage

Hi All. I'm new to the forum, but have already found it incredibly useful. My concern: we just purchased a 2015 25' Flying Cloud. This is our third trailer, but our first AS. While in storage, I was dismayed by the constant drop in voltage in our two 12-volt batteries over time. This has never happened to our other trailers. It's a drop of about 0.1 volts per week. Is this normal while the batteries are in "storage" mode? The only electrical device that stays on all of the time is the carbon monoxide monitor - I know this since the little green LED stays on no matter what. Why is that and is there a way to turn it off when not in use? Thanks for any suggestions.

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Old 07-02-2015, 07:43 AM   #2
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2001 25' Safari
Fair Oaks , California
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Posts: 237
Welcome to the forums and congrats on your new AS purchase. The answer to your question is, yes this is normal. Even when your trailer is in storage mode, there is a continual draw on your batteries charge. The best way to deal with this is to disconnect your batteries entirely when your trailer is in storage unless you have a way to keep them charged (solar or battery tender). My AS has only one battery. When I'm putting it into storage, I remove the battery and bring it home where it sits in my garage. About once a month, I make sure it is fully charged with my trickle charger. Doing this will greatly extend the life of your batteries. If you leave your batteries in your trailer while it's in storage, they will eventually discharge completely and your batteries will be toast. At that point, the only solution is to buy new batteries.

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Old 07-02-2015, 07:48 AM   #3
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Oswego , Illinois
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I moved my propane detector circuit to the downstream side of the store switch, eliminating that draw when in store mode.

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Old 07-02-2015, 08:20 AM   #4
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As mentioned above move all loads to the output side of the storage switch.

Another thing to keep in mind. Twin batteries have to be in balance. If not the lower battery will draw down the good one. This dose not appear to be the problem here but keep it in the back of your mind and get a specific gravity tester to have on hand.
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Old 07-02-2015, 10:35 AM   #5
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Greenwood , Mississippi
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In "store" mode, my batteries still have a charge after 6 weeks or more parked.
We are headed out this afternoon. Yesterday afternoon I went to the trailer, turned the switch to "use" and turned on the refrigerator. All is good.
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Old 07-02-2015, 10:57 AM   #6
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Lynnwood , Washington
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It is ALWAYS good policy to disconnect batteries when a rig of any kind is not being used for a significant period of time. Use a trickle charger with a timer to keep batteries fully charged.

Moreover, batteries should be kept at room temperature during cold weather - a heated garage is ideal.

Doing the above will extend battery life considerably.

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Old 07-02-2015, 11:53 AM   #7
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2014 20' Flying Cloud
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Originally Posted by TomKirk View Post
Moreover, batteries should be kept at room temperature during cold weather - a heated garage is ideal.


Not necessary at all. See my test and post on the subject.
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Old 07-02-2015, 12:49 PM   #8
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2011 30' Flying Cloud
Arvada , Colorado
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I installed a battery cutoff in the box itself. No issues, though I do remove the batteries at season's end and keep them over the winter on a trickle charger n the garage. We have AGM batteries.
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Old 07-02-2015, 12:53 PM   #9
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2012 30' Flying Cloud
San Antonio , Texas
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For what it's worth--and I know many disagree--I leave the stored trailer plugged into 120 without turning switch to storage mode. 2012, 30 Flying cloud, original interstate 24 batteries and AS factory installed charger. Batteries always at 100% per Tri Metric batt. monitor when I pick it up. I always check the batteries and have never added a drop of water. Batts. seem to do as well on boon docking overnights as the 24s ever did. Replacement's, probably next year, will be Trojan golf cart 6s like idroba above has.
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Old 07-02-2015, 05:48 PM   #10
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North/East , New Jersey
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I had the same problem with my 2007. Just install a switch in the 12 volt DC power supply line going to your propane detector and shut it off when your going to leve it in storage.
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Old 07-02-2015, 06:00 PM   #11
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2014 25' International
2010 22' Interstate
Carol Stream , Illinois
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It would be nice if someone knows of a device that allows a trickle charge to the batteries when plugged into shore power. Perhaps a device that plugs into a 110 outlet then a shore power connector into that trickle charge device. What I've been doing with my Interstate is plugging shore power once every three weeks to maintain the charge in my house batteries. There has to be a better idea. It's difficult to remove the two house batteries from the Interstate. I'm surprised Airstream doesn't sell a trickle charge device for the house batteries that's easy to connect c
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Old 07-02-2015, 08:16 PM   #12
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1996 25' Excella
Tillsonburg , Ontario
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You can buy a 12 v float charger for about $30-50. I have one ...a tiny little thing that I can set for 2, 4, or 6 amps charging, that switches to float when the batteries reach full charge. I don't use it to maintain the house battery when in the trailer but it could just as easily be hooked up to the circuit and plugged in when the trailer is stored. Mine happens to be a Canadian Tire Motomaster Eliminator...if we have it here in Canada you certainly will find something in the States. I know there is a slightly larger unit that is sold as the charger for battery back up sump pumps.

Harbor Freight have a Centec....maybe someone out there knows if it is any good!I personnally would want somethingh more substantial.

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Old 07-02-2015, 09:21 PM   #13
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2015 25' Flying Cloud
Eugene , Oregon
Join Date: Jun 2015
Posts: 53
Thanks Everyone

Thanks for all of the suggestions. Here is what I'm going to do:

1) I'm going to try installing a cut-off switch on the propane detector.
2) I just bought a portable 100W solar suitcase from Renogy. It apparently charges batteries at 5 amps from the sun.
3) I do have a great float charger, but I have no electricity where I store my AS, so I hope the solar suitcase does the trick. I will include an update and picture once I get a chance to try it out.
4) On a different subject, I hope to buy two 6 volt deep cycle batteries to replace my 12V batteries. I just have to increase the hight of the battery box.

Thanks again for the suggestions and pointers.

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Old 07-03-2015, 10:34 AM   #14
2015 27' Flying Cloud
2003 25' Safari
Parker , Colorado
Join Date: Aug 2009
Posts: 14
A word of caution: the propane detector is on 24/7 for a reason - safety. Think of what could happen if closing the switch is forgotten, and you have a stove propane leak. Be very cautious of that solution.

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