[RE-wrenches] High amp charge to desulphate

[Ron Young]

Just a follow-up on this. I have able to get the batteries to accept a  
higher and higher amp charge and the hydrometer indicates recovery is  
taking place. However, in the last 15 hour session of charging (this  
is being done in an unmonitored location overnight) the batteries off- 
gassed quite a bit. The gas was very strong rotten egg smell  
indicating hydrogen sulphite...not good stuff. I've never noticed this  
in charging batteries in the past even in some heavy charging  
scenarios you can get an acrid sulphuric smell but not the rotten egg  
smell. Is this because the batteries are so heavily sulphated and is  
this a normal consequence or is it an indicator of some other malady  
in the batteries?

Ron Young
earthRight Solar

On 10-Jan-10, at 8:32 PM, Ron Young wrote:

> Some interesting things to consider, thanks everyone!
>
> Ron
>
> On 10-Jan-10, at 4:20 PM, James Surrette wrote:
>
>> Hi Ron,
>>
>> Given the time in "storage" the cells will be severely sulfated and  
>> will not accept much current initially - probably 28A max (1400x2%)  
>> and 70A (1400x5%) will suffice once current is accepted.  A  
>> standalone "unregulated" charger or constant current would be best  
>> to reclaim these or at least get things started.
>>
>> Regards,
>>
>> Jamie
>>
>>
>> James Surrette
>>
>> Surrette Battery Co. Ltd
>> 1 Station Rd.
>> Springhill, NS, CAN
>> B0M 1X0
>>
>> Direct: 902.597.4027
>> Fax: 902.597.8447
>>
>>
>>
>>
>> >>> Ron Young <solareagle at solareagle.com> 1/10/2010 5:52 PM >>>
>> I have just acquired a 24v set of 1400a/h 2v cells that have been  
>> in storage without a charge for several years. They were connected  
>> up in a system that was never turned on (long story). I believe  
>> these batteries can be recovered if I can get a high enough amp  
>> charge into them. The battery mfg. recommends putting a 200 amp  
>> charge on until internal temp rises to 40 degrees C then let them  
>> cool and do it again, maybe 15 times, to blow the sulphates of the  
>> plates. Unfortunately I don't have a 200 amp charger but I do have  
>> an Outback 3524 inverter with an 85 amp charger. I'm wondering if I  
>> can force the inverter to maximum charge to accomplish this. I  
>> hooked the inverter up but the batteries only have about 10.5 v  
>> output from the batteries (hooked up 12 in series for 24v). For  
>> this reason the Outback won't power up. I am wondering about using  
>> a standalone charger to provide power to the batteries -- which  
>> will also provide power to the inverter -- and allow it to come on  
>> and charge. Anyone suggest a better way?
>>
>>
>> Ron Young
>>
>>
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