[RE-wrenches] High specific gravity

Mac Lewis maclewis1 at gmail.com
Tue Aug 12 20:01:54 PDT 2014


Thanks for the responses everyone.  I never considered that acid may have
been added.  I'll have to press him a little bit on that.  He's definitely
"old school" so I wouldn't be surprised if he tried this.  Dan, I
calibrated the refractometer, so I have confidence in its readings.  When I
say all over the place, we had 3 cells of specific gravity of 1.0, the rest
ranged from 1.24-1.33.  He is going to equalize again, but we will see if
he added acid.

Thanks again.


On Tue, Aug 12, 2014 at 8:13 PM, William Miller <william at millersolar.com>
wrote:

> 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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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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