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Old 10-18-2020, 01:42 PM   #1
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AGM batteries: Winter Storage recommendations?

Hi Folks,

I have 4 x 6V AGM batteries in my FR Sabre, and a 600W solar system mounted on top of the trailer. I have left the solar system charge controller running, but disconnected all of the trailer power from the battery system.

I'm writing today to see what other people recommend wrt these batteries:

1) Is it okay to leave them connected as described above for the winter? If not, why not?

2) Do AGM batteries require desulphination periodically? I'm having a difficult time finding any information on this.

3) If the batteries should be removed for the winter months, do they need to be placed on a trickle charger?

4) Does anyone know what the 50% SOC voltage is for AGM batteries?

Thanks for any and all input, it's very much appreciated.

All the best,

Bruce Williams
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Old 10-20-2020, 01:54 PM   #2
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I'm surprised that nobody has some advice to share on this battery topic. Any takers out there?
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Old 10-20-2020, 01:59 PM   #3
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Quote:
Originally Posted by WhiteEagle View Post
I'm surprised that nobody has some advice to share on this battery topic. Any takers out there?
Here's a place to start:

https://www.odysseybattery.com/news/...ery-in-winter/
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Old 10-20-2020, 02:03 PM   #4
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I take mine out and charge them once a month or so. I have a volt meter so I check. If it's below 12.8 volts or so I charge them.

Not subscribed so PM.
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Old 10-20-2020, 10:03 PM   #5
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Agm have a lower rate of self discharge than led acid batteries. I have successfully left mine in camper last couple of years. 30Ow solar kept them charged even with ademco cover installed but battery switch turned off
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Old 10-21-2020, 01:59 PM   #6
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Yup...just fully charge them then leave off the chassis negative and let them sit there all winter. At ROOM TEMPERATURE a disconnected AGM will lose 1% per month to self discharge...even less as the weather gets colder.
Duscharge to 50% should be 12.3V with most AGM's. And no worries about freezing even at 20 below as long as you're at 12.4 or above. You're good to 80 below with a full charge.
For those reading with wet cell batts... you can reduce by 1/10th of a volt but you will need to check Voltage more often since self discharge at room temps will bring you to 60% in 3-4 months...and maybe 6 months in slightly above freezing weather.
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Old 10-21-2020, 03:58 PM   #7
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I have yet to disconnect my battery during the off season.(Nov-Apr) and knock on wood, Never had any trouble. When we open up for the season, turn the electric on at the pedestal, hear the convertor charging the battery and all is good.
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Old 10-21-2020, 07:42 PM   #8
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I have 4-12V AGM batteries and I don't remove them during winter storage. I fully charge them then shut off the battery disconnect switch. Come spring they still are at 12.8V. Been doing it this way for 4 years now and the batteries are still going strong.
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Old 10-22-2020, 09:50 AM   #9
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I currently have four wet cell 6volt golf carts. I just keep one of these on them. It has an AGM setting for the different charge, and maintenance curves AGM's require. Works well. Comes with 2 different sets of leads, Alligator clips, and battery terminal leads, where the unit can be plugged and unplugged. If you hunt coupons you can buy these for around 24 bucks. I used one on an AGM I had for my farm equipment. Kept that battery charged for 2 years without issue.

https://www.harborfreight.com/4a-ful...attery+charger
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Old 10-28-2020, 09:09 AM   #10
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Everybody's "winter" is different. Here in Minnesota the trailer is winterized mid October and it's not safe to de-winterize until mid May. That's a long time. And it can be -20F at times over several months. I leave my AGMs hooked up and in the trailer; but make sure the "switch" is off; they're better off in the cold. About every 6 to 8 weeks, I hook up the shore power and give the batteries a boost for a day or so. Works fine. I never allow them to drop below 12.3V.
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