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Old 09-26-2018, 01:54 PM   #21
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Originally Posted by RickyNelson View Post
As a newbie there are so many things you can avoid by being part of this forum. Thank you to all of you for your expertise and experience. There are also many things you have to find out the hard way. I am in the process of finding out the hard way with my wet batteries that I need to replace after sitting up to 3 weeks at a time in storage. I would've loved to see the battery shutoff as standard. I am going to Amazon now to order it now. Thanks!
From what I have been told: The propane indicator "has" to be left on at all times to satisfy some code rule. Because of that, I am sure that Airstream doesn't dare supply a way to turn it off, regardless of what might be prudent (assuming that most AS owners would turn off their tanks, in storage). D
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Old 09-26-2018, 03:00 PM   #22
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2016 19' Flying Cloud
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Winter Battery Maintenance

Will keeping my 19 FC plugged into 30 amp service keep the batteries in good shape over the winter when left connected in place on the trailer?

There are 2 AGM batteries. Also, my unit has a 80w solar panel. Will this provide enough charge to keep the batteries in good shape if not connected to 30 amp service? Thanks.
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Old 09-26-2018, 04:46 PM   #23
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Carlisle , Pennsylvania
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Originally Posted by brundom View Post
Will keeping my 19 FC plugged into 30 amp service keep the batteries in good shape over the winter when left connected in place on the trailer?

There are 2 AGM batteries. Also, my unit has a 80w solar panel. Will this provide enough charge to keep the batteries in good shape if not connected to 30 amp service? Thanks.
Hi

The best approach is to plug the trailer into a 7 day timer and let it power things up a couple hours each week. They are a $5 to $15 sort of thing from Amazon. There is nothing magic about this one or that one. If you already have one lying around it will do a fine job.

Bob
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Old 09-26-2018, 04:53 PM   #24
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Snoqualmie , Washington
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Quote:
Originally Posted by AirMiles View Post
Your batteries were probably drained to 8.9 Volts, not 8.9%. In my experience, this level of draw down will permanently damage a battery, but I'm not an AGM battery user. I too murdered my first set of Airstream batteries in a similar way. After about 30 days of non-use, the parasitic loads will begin damaging the batteries. The solution to stop these parasitic loads is to disconnect the negative battery cables when you will not be using your Airstream for more than 30 days.

I installed a battery disconnect post so I can flip one lever to disconnect the batteries. Here is what I installed: https://www.amazon.com/WirthCo-20148...PT3GRJVEZ183S8

This is a picture of it installed: http://www.airforums.com/forums/f42/...ml#post2079369

Flipping this lever each time you store your Airstream will solve your battery issues.
Do you need to do this for both negative cables or just the one you show in the pic?
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Old 09-27-2018, 09:06 AM   #25
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Originally Posted by DTCOnyx View Post
Do you need to do this for both negative cables or just the one you show in the pic?
Hi

You only need a switch on one side of the battery.

The math on "how long" for a battery in storage:

24 hours in a day, 30 days in a month gets you 720 hours in a month.

A normal battery setup has 70 to 100AH of usable capacity.

If your parasitic draw is < 0.1A you probably are ok for a month.

If your draw is 0.25A ( a much more likely number) you are ok for about 10 days.

Indeed a lot depends on *exactly* what is on your particular trailer.

If your batteries are only charged to 80% of capacity, cut all those numbers about in half. If they are a bit old / damaged, that also cuts into your time. If they self discharge (which all batteries do) that comes off the allowance as well.

So, how lucky do you feel?

Bob
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Old 09-27-2018, 10:08 AM   #26
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Quote:
Originally Posted by uncle_bob View Post
Hi

The best approach is to plug the trailer into a 7 day timer and let it power things up a couple hours each week. They are a $5 to $15 sort of thing from Amazon. There is nothing magic about this one or that one. If you already have one lying around it will do a fine job.

Bob
Hi Bob,

When the 7 day timer is not on will the solar panel provide some charge as well?

Thanks
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Old 09-27-2018, 10:17 AM   #27
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Originally Posted by DTCOnyx View Post
Do you need to do this for both negative cables or just the one you show in the pic?
You need to disconnect the two black cables that go into the Airstream. If you have 12V batteries, you need to disconnect both negative posts. If you have 6V batteries like the picture, you only need to disconnect the one post with the two black cables attached.
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Old 09-27-2018, 10:34 AM   #28
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Quote:
Originally Posted by AirMiles View Post
You need to disconnect the two black cables that go into the Airstream. If you have 12V batteries, you need to disconnect both negative posts. If you have 6V batteries like the picture, you only need to disconnect the one post with the two black cables attached.
Our Classic has two separate battery boxes with the pos & neg cables from each leading to a buss bar. The neg buss is mounted where a disconnect switch would be difficult.
Took both pos cables off the buss ran them to the switch then back to the buss bar, a bit of a pain but worth it.👍

Bob
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Old 09-27-2018, 11:28 AM   #29
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In the winter, after winterizing the trailer, I pull the batteries out and bring them home to winter over in my garage. Every two to three month or so, I throw them on a battery tender to top them off. Trojan group 24 wet cells. In the summer I just disconect the negative cables from the posts when not using the trailer. So far, so good. By the way, I destroyed the original interstates in short order by not understanding the system.

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Old 09-27-2018, 01:35 PM   #30
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I have a 20 foot flying cloud and I have a battery disconnect switch right by the front door. I turn that off when I leave my camper for any amount of time in storage. My two batteries are holding a charge just fine. Am I lucky or am I missing something ?
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Old 09-27-2018, 02:00 PM   #31
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Originally Posted by Native143 View Post
I have a 20 foot flying cloud and I have a battery disconnect switch right by the front door. I turn that off when I leave my camper for any amount of time in storage. My two batteries are holding a charge just fine. Am I lucky or am I missing something ?
That is an option but most flooded batteries are going to self discharge ~15% per month barring any parisitic load.
Less for AGM and a lot less for Lithium. If your sniffers bypass the shut off switch, I would pull their fuses or disconnect the battery instead.
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Old 09-27-2018, 04:38 PM   #32
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Quote:
Originally Posted by ROBERT CROSS View Post
Our Classic has two separate battery boxes with the pos & neg cables from each leading to a buss bar. The neg buss is mounted where a disconnect switch would be difficult.
Took both pos cables off the buss ran them to the switch then back to the buss bar, a bit of a pain but worth it.👍

Bob
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Question: Why doesn't the Positive terminal get disconnected? Why just the Negatives? A AS service person told me that the positive side should be disconnected for any reason of battery disconnection. Dave
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Old 09-27-2018, 05:07 PM   #33
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Quote:
Originally Posted by Dave-Nancy View Post
Question: Why doesn't the Positive terminal get disconnected? Why just the Negatives? A AS service person told me that the positive side should be disconnected for any reason of battery disconnection. Dave
Should NOT be disconnected for any reason?

If that is what the AS person said, they are correct.
For safety, you always remove neg first when disconnecting a battery for removal/service.
For a cut-off switch you can use pos or neg.

Bob
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Old 09-27-2018, 05:16 PM   #34
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Especially since everybody knows electrons flow out of the positive, back to the negative terminal.
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Old 09-27-2018, 06:21 PM   #35
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Especially since everybody knows electrons flow out of the positive, back to the negative terminal.
The one thing, sadly, that the various pioneers in the field of electricity got dead wrong.

In reality, electrons flow from the negative terminal to the positive terminal.

"Conventional Current" says that current flows from positive to negative, but it's actually "holes" flowing in that direction when you are talking transistors and other solid-state stuff...

In any case, put the battery shut-off switch in the positive lead of a battery if practical. Breaking the circuit anywhere does shut it off just as well.

When disconnecting battery cables, however, ALWAYS disconnect and insulate/isolate the GROUND lead first. Then take the positive lead off. It helps avoid melting stuff when the wrench on the positive terminal slips and hits something grounded.
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Old 09-27-2018, 06:40 PM   #36
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Originally Posted by Dave-Nancy View Post
Question: Why doesn't the Positive terminal get disconnected? Why just the Negatives? A AS service person told me that the positive side should be disconnected for any reason of battery disconnection. Dave


If you reconnect the positive cable after the negative you will get a nasty spark. Either disconnect the negative or both but always reconnect positive before negative.
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Old 09-27-2018, 09:54 PM   #37
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Any thoughts on using a 12v battery tender that was used for a motorcycle to provide a trickle charge to the AGMs?
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Old 09-27-2018, 11:43 PM   #38
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Welcome Aboard!! 👍

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Originally Posted by Tpdittman View Post
Any thoughts on using a 12v battery tender that was used for a motorcycle to provide a trickle charge to the AGMs?
I've used this to maintain our boat AGM for yrs.
800ma requires a looong charge on a dead battery and even then would not top-up an AGM completely. Good maintainer though. 👍
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Old 09-28-2018, 07:57 AM   #39
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Originally Posted by brundom View Post
Hi Bob,

When the 7 day timer is not on will the solar panel provide some charge as well?

Thanks
Hi

It will if there is sunlight on the panels. Depending on your storage location that may be an iffy sort of thing. If you can count on solar all winter long, don't worry about the timer and shore power hookup.

=====

The only reason to disconnect the negative first on a battery is safety. If the wrench slips and hits a part of the frame, no spark ( negative and frame are at the same voltage). Once the negative is off, getting a wrench between the positive and frame *should* have no effect.

Hmmmm .... did I unplug the converter? .... did I shut down the solar? .... If you missed those steps, the positive is still likely hot to ground, even with the battery negative pulled. A wrench that shorts the positive will still create issues (like blowing the output fuses in your converter ....).

====

Pulling the positive cable or not makes no difference safety wise. What it *does* do is give you a second set of wires lying around in the battery box. Get those wires to the wrong battery terminal and you have some major problems. Only playing with the negatives is intended to eliminate confusion when you put things back together.

Bob
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