trojan battery cycle [RE-wrenches]

Jay Peltz, Peltz Power jay at asis.com
Wed Feb 13 09:52:14 PST 2008


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Hi Jamie,

Thanks and yes very hard.

But very helpful to me as I live off grid and am always trying to  
improve both my understanding and my system.

thanks,

jay
On Feb 13, 2008, at 9:33 AM, James Surrette wrote:

>
> Hi Jay,
>
> 2% current (6 hr) is text book for 100% SOC and very accurate.  Of  
> course, getting the client to run the gen that long, as you know,  
> is the hard part.
>
> Regards,
>
> Jamie
>
>>>> "Jay Peltz, Peltz Power" <jay at asis.com> 13/02/2008 12:57 pm >>>
>
> Hi Jamie,
>
> I have heard other battery manufactures use a 2% current rate to end
> absorb charge.
> ( 400 amp hr battery X 2% = 8 amps)
>
> What do you think about this vs a set time for absorb?
>
> thanks,
>
> jay
>
> peltz Power
> On Feb 13, 2008, at 8:51 AM, James Surrette wrote:
>
>>
>> Hello William,
>>
>> A quick note from the battery supplier side.
>>
>> We've noticed, as battery banks capacity has increased, an increase
>> in deficit cycling and an increase in the need of "corrective"
>> equalizations.  However, a quick calculation that we've been
>> providing, which has shown good success;
>>
>> i) At bulk voltage - assume battery at 80% SOC
>> ii) Take 20hr rate capacity and determine AH of remaining 20%  
>> deficit.
>> iii) Divide AH deficit by the "average" charge current during the
>> Absorb cycle - not an exact science I know.
>> iv) Provides a more accurate required absorb time - and often
>> surprised the client when 4+ hours are required.
>>
>> EQ duration can be calculated in the same fashion.
>>
>> Regards,
>>
>> Jamie
>>
>>
>>>>>
>
>
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