[RE-wrenches] High specific gravity

Jerry Shafer jerrysgarage01 at gmail.com
Tue Aug 12 19:12:03 PDT 2014


does your customer have any issues or is this a first inspection type call
just to see
Jerry


On Tue, Aug 12, 2014 at 3:54 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 Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates *
>
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