trojan battery cycle [RE-wrenches]

[James Surrette]

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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