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Bringing flat AGM back from the dead

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Mon Oct 16, 2023 3:42 pm Post subject: Bringing flat AGM back from the dead

Hi Group

Figured would mention how we brought back four 12 volt 100 amp AGM batteries from the dead. They are being used on a Solar System. About 6 months old. Anyway the charge controller decided to fail and stopped all charging and put a load on batteries. They were flat for about 3 weeks: two reading 5.2 volts and the other two were at 5.5 volts.

I have a 4 station 750mA Battery Tender.

The two 5.2 volters wouldn't take a charge, used a 2 amp charger for about 4 hours, then put on the Battery Tender. The two 5.5 volters started taking a charge right away. Note: For the first day  they were only taking 150mA to begin with, then after 6 hours went up to 350mA. 

After a week all peaked and were floating. 

Then put a 10 amp load for 2 hours and charged with a 10 amp charger for 2 hours and put on the Battery Tender till Float.

Then put a 10 amp load for 4 hours, then a 10 amp charger for 4 hours and put the Battery Tender till float.

Just checked with a load tester and they seem OK. Put on Battery Tender and they are all floating now.

Looks like the Scrap Yard won't get these 4 examples, but they will be getting their hands on the charge controller.

Ron

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skywagon185(at)gmail.com
Guest

Posted: Mon Oct 16, 2023 7:28 pm Post subject: Bringing flat AGM back from the dead

Ron,Good report and results...Â 

It would be interesting if they still have their full AH rating after reviving from the dead.

Battery Tenders... I use a lot of them.

One nasty problem:Â  If the wall power fails, i.e. GFI trips and you don't reset it, the BT's will take the battery back down to the dead zone as they usually don't have a blocking diode as part of the charging output.

Dave

On Mon, Oct 16, 2023 at 4:42â€¯PM rparigoris <rparigor(at)hotmail.com (rparigor(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com (rparigor(at)hotmail.com)>

 

 Hi Group

 Figured would mention how we brought back four 12 volt 100 amp AGM batteries from the dead. They are being used on a Solar System. About 6 months old. Anyway the charge controller decided to fail and stopped all charging and put a load on batteries. They were flat for about 3 weeks: two reading 5.2 volts and the other two were at 5.5 volts.

 I have a 4 station 750mA Battery Tender.

 The two 5.2 volters wouldn't take a charge, used a 2 amp charger for about 4 hours, then put on the Battery Tender. The two 5.5 volters started taking a charge right away. Note: For the first dayÂ  they were only taking 150mA to begin with, then after 6 hours went up to 350mA. 

 After a week all peaked and were floating. 

 Then put a 10 amp load for 2 hours and charged with a 10 amp charger for 2 hours and put on the Battery Tender till Float.

 Then put a 10 amp load for 4 hours, then a 10 amp charger for 4 hours and put the Battery Tender till float.

 Just checked with a load tester and they seem OK. Put on Battery Tender and they are all floating now.

 Looks like the Scrap Yard won't get these 4 examples, but they will be getting their hands on the charge controller.

 Ron

 

 

 

 

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nuckolls.bob(at)aeroelect
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Posted: Tue Oct 17, 2023 9:21 am Post subject: Bringing flat AGM back from the dead

 	  Quote: 	
		  On Mon, Oct 16, 2023 at 4:42â€¯PM rparigoris <rparigor(at)hotmail.com (rparigor(at)hotmail.com)> wrote:  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com (rparigor(at)hotmail.com)>

  Hi Group Figured would mention how we brought back four 12 volt 100 amp AGM batteries from the dead. They are being used on a Solar System. About 6 months old. Anyway the charge controller decided to fail and stopped all charging and put a load on batteries. They were flat for about 3 weeks: two reading 5.2 volts and the other two were at 5.5 volts. I have a 4 station 750mA Battery Tender. 	
 

   <snip>



 	  Quote: 	
		     Put on Battery Tender and they are all floating now. Looks like the Scrap Yard won't get these 4 examples, but they will be getting their hands on the charge controller. Ron 	
 

    Dead battery recovery is not impossible . . . see: Section 5.6, page 23

    of this document.



  http://aeroelectric.com/Mfgr_Data/Batteries/Concorde/Chairman_Technical_Manual.pdf 



    The operative phrase in this excerpt is "Batteries in this

    condition may SOMETIMES be recovered".



    Indeed, I've read military qualification requirements for

    Concorde products where a battery is deliberately discharge

    to the degree that shorting jumpers are placed across cells

    for a period of time whereupon a recovery process is

    exercised; the battery MUST recover to some acceptable

    metric. 



    I suspect there can be large differences in the ability

    of various battery products to pass this test . . . 

    particularly in the relatively short time frame

    in a laboratory environment.



    Have you conducted cap checks on your recovered

    batteries?



 



 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Tue Oct 17, 2023 5:02 pm Post subject: Re: Bringing flat AGM back from the dead

Hi Bob

The Batteries are 110 amp AGM 12 volt. We load tested them for 10 seconds at 300 amps. All 4 were about the same, after 10 seconds voltage was 9.6 to 9.8 volts. We were about 55F temperature.

I didn't load or capacity test these batteries when new.

At 55f we ran each battery with a 8.95 amp load for 3.33 hours (approx. 30 aHs). Each battery ended with approx. 12.0 volts. Ranged between .4 volts of each other. On a generic graph I have, it shows a lead acid battery with a c/10 load at 50% capacity at 12.0 volts. That's the only capacity testing we did. In service they need to run at 5 amps for 2 hours most of the time.

Do you have any other recommendations on capacity test try?

Ron P.

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Oct 17, 2023 7:03 pm Post subject: Bringing flat AGM back from the dead

At 08:02 PM 10/17/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>



 Hi Bob

 The Batteries are 110 amp AGM 12 volt. We load tested them for

 10 seconds at 300 amps. All 4 were about the same, after 10

 seconds voltage was 9.6 to 9.8 volts. 	


   That seems a bit 'soggy' for 110 ah batteries. The

   'cranking test' that was standard at B&C for years

   was to apply a load that produces a terminal voltage

   of 9V and hold it for 15 seconds. Read the 9v current

   at the 15 second mark. New, 18AH SVLA batteries would

   routinely produce 500+ amps over that interval.



   Just for grins, I've got a group 65 battery in

   the shop with a 1200W inverter bonded to the side.

   Handy for portable power in the field.



   It's got a August 2019 manufacturing date

   sticker. The sticker cranking value is 850A.

   I just did a 9V/15S load test on it and got

   a value of 620 Amps.  It had not been topped

   off in some time so I left it in the care of a

   YONHAN charger.



   I'll do a WestMountain Radio CAP check on it

   in the morning. The battery weighs about 55

   pounds so I would expect it to have a new

   capacity on the order of 50AH.



   After I suck out and measure all its juices, I'll

   recharge with the YONHAN and plot the curve. This is

   going to take a few days so I'll have to report

   back.



   (I'm in process of setting up a vacuum pump

   drive pad test stand with an 8-30A electrical

   system mockup. It will feature an electronic

   load bank capable of much larger loads than

   my WMR battery tester . . . so I'll be able

   to evaluate big batteries in less time. I

   dug out a data acquisition system I last used

   on a project at Beech. It's an 8-channel, 12-

   bit system capable of 1000 samples/second. The

   quality of my data plots should take a quantum

   jump!)



 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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