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" <i...@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* • *i...@creativeenergies.biz* > * **Creative Energies* > *Victor, ID *office 208.354.3001 > Lander, WY office* *307.332.3410* <i...@creativeenergies.biz> > *Salt Lake City, UT office 801.487.6489 > * *www.CreativeEnergies.biz <http://www.creativeenergies.biz/>
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