Thanks Lee - that's really what I wanted to hear. I was initially quite disappointed in the spread on the pack and had dreaded the possibility that this meant shorter pack life. Sounds like it might not.
- Peter Flipsen Jr On Mon, Feb 3, 2014 at 1:32 PM, Lee Hart <[email protected]> wrote: > SLPinfo.org wrote: > >> [Cor] implied that with subsequent charging a >> >> series pack can actually move closer together (i.e., become more >> balanced). Is that really true? >> > > Yes. Deliberate overcharging is the traditional way to balance lead-acid > batteries. It works, though not very well. > > When you overcharge, the batteries that reach "full" first begin to heat > up and gas. If this is a flooded battery, the water loss isn't critical, as > you can replace it. If it's a sealed battery, the case pressurizes inside. > Too much overcharging, and the vents will open to relieve the pressure, and > water will be lost forever -- this shortens that battery's life. > > The extra heat also tends to shorten the life of the battery being > overcharged. If the overcharging is modest, the loss in life is also modest. > > So, balancing by overcharging is cheap and easy. As long as the imbalance > you're trying to correct is small, the loss in life isn't too bad (most > people won't notice it). > > -- > Ring the bells that still can ring > Forget your perfect offering > There is a crack in everything > That's how the light gets in. > -- Leonard Cohen, from "Anthem" > -- > Lee Hart -- see my EVs and projects at http://www.sunrise-ev.com/ > > _______________________________________________ > 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140203/ddc54843/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)
