Hi Michael, " At rest, momentarily after taking them off charge,"
Just brainstorming, your meter is probably not better than ±0.01. You can't be sure that 13.32 in't 13.33, and 13.36 isn't 13.35. If you are going to make money and time decisions based on this you should take multiple readings and be convinced of a stable state. There are so many ways a temporary voltage difference could appear that is so small, I think you can chalk it up to air currents, or imperfections. It would be hard to prove this at such small voltages, but I bet if you sat one on a cold spot of floor and the other on a bench under a lamp the temperature change would cause a voltage drift. Or maybe if you sat your meter under a lamp one time and not the next... Anyway it sounds like a tiny difference to me. On Sun, Feb 2, 2014 at 5:05 PM, EVDL Administrator <[email protected]> wrote: > Deka's GEL batteries are so consistent in manufacture that they do very > well > in EV use without any balancing gadgets at all. > > However, Deka's AGMs are of a different design and origin. I wouldn't > assume the same is true of them. > > Still, it can't hurt to try balancing them and seeing how well they stay > there, as long as you're monitoring them fairly closely. > > Connect the 4 batteries in parallel and leave them that way for as long as > you can - at least a week or two. This may not totally equalize the state > of charge among them, but it will at least tend to equalize the VOLTAGE. > The only way I know of to equalize SOC any better is to charge each battery > (ideally, each cell) individually with a DV:DT profile. > > David Roden > EVDL Administrator > http://www.evdl.org/ > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140202/ad9d5912/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
