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Old 08-20-2014, 08:48 PM   #15
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lik tomzstream mentioneed, the red light on my AS also stays lit if i have it hooked up to shore power. i check the indicator panel often and it shows 13.5 ish when the shore power is running.

some of the web discussions offer differin g opinions on trickle chargers. some say that they will not cut off and will fry the batteries. other say they work fine. i'm SO confused.

it would sure be nice if the AS's really did have a system that would work to keep the batteries topped off with shore power without over charging.

i might still invest in a good trickle chargwer and use it while keeping an eye on the charge.
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Old 08-21-2014, 09:14 AM   #16
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I pulled this off the web: surprisingly there is a big variation in info out there.

"All Lead acid batteries (Gel, AGM, Flooded, Drycell, etc) are made up of a series of 2.2 volt cells that are bridged together in series to reach their final desired voltage. For instance, a 6 volt battery will have 3 cells (3 x2.2= 6.6 volts), a 12 volt battery will have 6 cells (6 x2.2=13.2 volts) and so on.That 2.2 volts is the fully charged, straight off the charger number. The actual resting voltage, or the voltage a battery will settle at 12-24 hours after being removed from the charger, is closer to 2.1 volts per cell, or about 6.4 volts for a 6v battery, and 12.7 volts for a 12v battery. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries."

If you are going to purchase a Trickle charger to maintain the batteries when not in use, that probably means a "Float Charger". For about $50 you can buy a number of automatic chargers that apply 14+ volts to get the battery up to full charge then drop back to about 13-13.5 volts ("float charge" to hold it. That voltage will not overcharge a battery and cause water loss. My solar panel controller settles down to 13.4 volts once the battery is fully charged. It runs as high as 14.5 volts in full sun if the battery is somewhat discharged.
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Old 08-21-2014, 12:10 PM   #17
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13.2

Thanks JCWDCW, that is exactly the information I was wondering about and looking for.
I Have been watching my Battery tender jr and it seems to charge my motorcycle up to about 13.2/ 13.3 and then settles at 13.20, very little change. It does the same thing when connected to my truck that has dual batteries. Seems to be consistent. so I had a second one (Tender Jr.) I had received as a gift, and wanted to see if it would go up to 13.5 volts.
won't do it. Checked it on car battery, Truck batteries, Airstream Marine batteries, Motorcycle, the Battery tender jr goes up to 13.3 and drifts back to 13.19 - 13.21volts. (checked with three meters to make sure)

I was expecting 13.5 but they seem to pull up at 13.31 volts, here in the heat of summer. I will check when it is cold this winter and see what they do. I don't then they are temperature compensated.
These trickle chargers are good in the winter. Motorcycle battery is three years old and strong as a horse. Helps that Jeep start at -2 degrees F.

Must be doing something right
Thanks !
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Old 08-22-2014, 11:59 AM   #18
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Thanks
So I am wondering how a single charger would behave when connect to one battery
when that one battery is then connected in series like they are in an AS.
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Old 08-22-2014, 12:08 PM   #19
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Thanks
So I am wondering how a single charger would behave when connect to one battery
when that one battery is then connected in series like they are in an AS.

First, they are hooked up in parallel, not series, unless you have 2 6V batteries. To answer your question, the leads should be hooked to the positive of one battery and negative of the other. That is the only way to get near equal charge across all cells in both batteries. Make an extension if you have to. I take mine out and use 12 AWG jumpers to parallel them in the garage.
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Old 08-22-2014, 01:03 PM   #20
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Quote:
Originally Posted by dznf0g View Post
First, they are hooked up in parallel, not series, unless you have 2 6V batteries. To answer your question, the leads should be hooked to the positive of one battery and negative of the other. That is the only way to get near equal charge across all cells in both batteries. Make an extension if you have to. I take mine out and use 12 AWG jumpers to parallel them in the garage.
Since I had one handy, I've attached (hopefully) a picture of our battery box. The Battery Tender cable is connected to one of the negatives (top left) and the other positive (bottom right).
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Old 08-22-2014, 02:00 PM   #21
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Originally Posted by JCWDCW View Post
I pulled this off the web: surprisingly there is a big variation in info out there.
What?? On the Interweb?????
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Old 08-22-2014, 02:13 PM   #22
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Since I had one handy, I've attached (hopefully) a picture of our battery box. The Battery Tender cable is connected to one of the negatives (top left) and the other positive (bottom right).
That's what I do too- except it really doesn't matter if the pos and neg are on the same battery.
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Old 08-28-2014, 07:22 PM   #23
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This thread got too complex.
Back to original questions:
The batteries are in parallel so charge them as one unit.
Battery tender does a good job (slow), just connect it.
No need to disconnect terminals but for cleaning.
If trailer is stored and on 110V, put batteries on "storage" (this stops charging by non-smart charger) and connect them to battery tender.
Connected to a car batteries always charge from vehicle.
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Old 08-29-2014, 02:21 PM   #24
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excellent pic

Quote:
Originally Posted by teagues View Post
Since I had one handy, I've attached (hopefully) a picture of our battery box. The Battery Tender cable is connected to one of the negatives (top left) and the other positive (bottom right).
Yes that was a real good detailed pic Teagues. That shows everything, and shows how easy to hook an external charger to the batteries. I use the battery tender junior and it seems to work fine. No boil over.
Have a good one,
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Old 08-29-2014, 03:19 PM   #25
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I use an automatic deep cycle 10amp charger........If I charge both batteries simultaneously as shown above, will the automatic charger cycle to maintenance mode prior to fully charging each battery?
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Old 08-29-2014, 03:51 PM   #26
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My 35' Southwind MH had a switch on the panel that when activated would disconnect the batteries. When I switched it off in the Spring, the batteries still had plenty of charge in them. no battery tender or charger all winter.

I could, and often did, just leave it connected to shore power all winter. (I liked to start the engine every month or so, and run it for 20 to 30 minutes.) Didn't disconnect the batteries when it was on shore power.

Either way the batteries were fine in the Spring.

As quality campers go, that Southwind was not nearly the quality of a 31' Classic AS. Didn't cost nearly as much, either.

Now you are telling me that my top of the camper food chain Airstream has a cheap converter that will burn up my batteries? I was told that I was buying the best.
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