[RE-wrenches] High specific gravity

[William Miller]

Mac:

Someone has added acid to the cells. I've had the same experience and found out the truth later on. 

William

Miller Solar

> On Aug 12, 2014, at 6:54 PM, Mac Lewis <maclewis1 at gmail.com> wrote:
> 
> Hello wrenches,
> 
> I just went on a service call for a new client.  He had a bank of 4 year old Interstate L16HCL batteries, 2 strings of 8, 48V system, 840Ahr.  We went through the batteries and got specific gravity on all of the cells post-equalization.  I was a bit surprised to see some very high numbers ie over 1.32 for the specific gravities (higher than my refractometer goes).  The specific gravities were all over the place, but I haven't seen numbers this high.  I don't have a great explanation.  He has a stacked 3648 VFX Outback system, and the set-points were 58.8V Absorb for 2 hours, and 62V Equalize for 2 hours.  He has a decent amount of solar (about 3400W) and a 1000W wind generator.
> 
> Any ideas why the specific gravity is so high on some cells?  Also, is there anything wrong with having SG this high, post-equalization?  For this very standard battery, what settings do you go with (Bulk, Absorb, Float, Eq, and times for Abs and Equalization).
> 
> Thanks in advance
> 
> 
> 
> -- 
> 
> 
> 
> Mac 
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