[RE-wrenches] Battery voltage set points and specific gravity

[Phil Undercuffler]

Ian, if you're seeing discrepancies between cells then an EQ charge is the
only real solution. If an "EQ"charge hasn't resolved the imbalances, you
probably haven't achieved it. One common mistake
I saw among my neighbors was confusing unregulated charging with equalizing.
Surrette has published some good tech bulletins on this - although designed
for their product the concepts and process applies to all FLA batteries to
some extent.

To answer your second question, the answer varies depending upon whether the
equipment you are using can perform in a coordinated manner.  If you are
mixing brands, the hard part is keeping the controllers from going into
float after a power outage, when the inverters charge the batteries after
the ac returns.  If you absolutely positively must mix brands, set the CC
float voltage high, and the inverter bulk low. And still plan on checking in
on the system every now and again to make sure the float LED isn't blinking
merrily along...

Phil Undercuffler
On Sep 19, 2011 7:54 PM, "Ian Eastman" <ian at creativeenergies.biz> wrote:
> Hi. I was hoping that someone could simply answer a couple questions on
> battery voltage set points and specific gravity of cells.
> I'm a bastard son of generation "grid tied", and in the last couple years
> and a job change have just begun building and servicing battery systems.
> First off. I was reading recently that the specific gravity of a cell
should
> be somewhere close to 1.25 (temp corrections excluded). My question is
with
> a cell that is reading low, aside from an equalization charge is there
> another way to bring the cell closer to its counterparts? And if an
> equalization charge doesn't fully solve the disparity, than is that it?
> Second. Can anyone clearly line out the voltage setpoints for a charge
> controller providing the main source of charging for a battery bank with
the
> ability to sell back any excess power.
> Thank you.
>
> --
> *Ian Eastman *| Installation/Project Management
> *GO SOLAR!*
> *Cell: 307.413.6789* • *ian at creativeenergies.biz*
> * **Creative Energies*
> *Victor, ID *office 208.354.3001
> Lander, WY office* *307.332.3410* <ian at creativeenergies.biz>
> *Salt Lake City, UT office 801.487.6489
> * *www.CreativeEnergies.biz <http://www.creativeenergies.biz/>
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