[RE-wrenches] Info On 2 V batteries Please

[Jay Peltz]

Hi Peter

Are these 12 batteries in a large single steel case?

And are they flooded or VRLA?

Thx

Jay
Peltz power







Sent from my iPhone

On Nov 27, 2012, at 1:31 PM, "Parrish, Peter" <Peter.Parrish at canyons.edu> wrote:

> We recently purchased a battery powered forklift, with 24 ea. 2V batteries. Approximate dimensions: W=5", L=6-3/16", H=~21" (hard to tell). Enersys is stamped on the top.
> 
> The battery supplier claims the batteries are "24-85-13" but this refers to a 24V battery as far as I can tell. He also claims that the batteries are rated at 510-550 A-hr. I am assuming that the lower number is for 6 hours discharge.
> 
> I would like to know more about the batteries. Also, how to discharge / charge them. Should they be run down to 20% SOC and then fully charged? What if we don't use the forklift for a week at a time?
> 
> Based on my experience of using AGM batteries, it would seem that the Bulk charging rate should be some percentage (e.g. 20%) of the 6-hour ampacity, then there is a constant voltage absorption charge (e.g. Vabs=2.385 V), and a switch to Float when the charging current drops to some low percentage (e.g. 0.5% of capacity), and the Float voltage being 2.125 V. Again everything at 25 deg C. It seems like the forklift guys like to refer everything to a 6 hour capacity, which may be related to the maximum typical daily usage.
> 
> What is the relationship between Voc and SOC after resting the battery for 6 hours at 25 deg C?
> 
> Thanks in advance for your help, guys.
> 
> - Peter Parrish
> 
> Alternative Energy Department
> College of the Canyons
> peter.parrish at canyons.edu
> O: (661) 362-3888 C: (323) 839-6108
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