[RE-wrenches] battery question

[jay peltz]

Hi Jamie and others.

Thanks for the conformation and the information.

Another system installed badly.  Hard to give bad news to people.

Thanks,

jay

peltz power
On Sep 4, 2008, at 5:42 AM, James Surrette wrote:

> Morning Jay,
>
> I don't have a lot of good news for you - but maybe others do?   
> Years ago, I visited a commercial fishing client that had a 6 week  
> old 32VDC bank of batteries that were "not performing".  Once we  
> reviewed, we noticed a tap 6 cells in.....for 12V radios.  Boat had  
> been out for a 6 week run, which meant 6 weeks of charging at  
> ~2.3VPC and the 10 non tapped cells were toasted (red cases were  
> actually black).  Of course, client wanted warranty but that is  
> another story.
>
> Your only hope is to separate the "low" 12V bank and charge to 100%  
> SOC.  Then charge the "hi" 12V bank to 100% (probably already there  
> or beyond).  Finally, marry the banks again and "balance" with a  
> 2.35 - 2.4VPC until cell voltage stabilizes.  Current acceptance  
> will be low but voltage will ultimately stabilize across the bank.
>
> The problem is, the "low" bank has been undercharged for 2 years and  
> the "hi" bank has been severely overcharged.  As a result the  
> capacity / corrosion differences between the two "sides" will be  
> great - leading to charging difficulties going forward, which may  
> result in the bank needing to be replaced.  However, I would  
> recommend attempting to bring the bank into line before replacing.
>
> I hope this is of assistance,
>
> Jamie
>
>
>
>
> James Surrette
>
> Surrette Battery Co. Ltd
> 1 Station Rd.
> Springhill, NS, CAN
> B0M 1X0
>
> Direct: 902.597.4027
> Fax: 902.597.8447
>
>
>
> >>> jay peltz <jay at asis.com> 09/04/08 1:25 AM >>>
> HI All,
>
> A guy has 1/2 loaded his big surrette 24v battery,  yep put 12v loads
> onto only one side of the 24v battery.
>
> Now after 2 yrs 12v side is low voltage, 24v side is boiling like  
> crazy.
>
>
> System is charged via SW4024, big genny and good size array.
>
> so my question is can/should I
>
> 1. remove the 12v by installing a Vanner or similar.
>
> 2. put a 12v charger onto the lower 12v side to put an equal charge
> into the batteries.
> ( I have never had success trying to charge up a highly unbalanced
> battery)
>
>
> thanks,
>
> jay
>
> peltz power
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