There were no parasitic loads on any particular cells. They were powered by the whole string in Hardys test.
Sent from my iPhone > On Jun 27, 2015, at 10:34 PM, EVDL Administrator via EV <[email protected]> > wrote: > >> On 27 Jun 2015 at 15:29, Peter Gabrielsson via EV wrote: >> >> He proved that putting parasitic loads on some cells in a series string >> vill cause the string to go out of balance. > > That's what you'd expect, no? > > I see this less-than-ideal behavior in my Ping batteries, which are fitted > with an integrated BMS. I just recently learned that although the current > BMS they use draws its power from the entire battery, the older ones > (including mine) drew BMS power from the lowest 4 cells. > > Thus my BMS will indeed tend to imbalance the battery, especially if it's > not cycled regularly. However, the BMS has a "charged" LED for each cell, > and the only time I see more than a few minutes from first LED to all 8 is > when I've let it sit for months between uses and charges, something I don't > really recommend. > > BTW, I just checked the capacity on these batteries. They're 4 years old > and seem to be holding up pretty well. They're rated for 10ah; one is > producing 9.7ah and the other 10.0ah. This is to a 19.8v cutoff (just > slightly less than 2.5vpc average). > > David Roden - Akron, Ohio, USA > EVDL Administrator > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > EVDL Information: http://www.evdl.org/help/ > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > Note: mail sent to "evpost" and "etpost" addresses will not > reach me. To send a private message, please obtain my > email address from the webpage http://www.evdl.org/help/ . > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > _______________________________________________ > 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) > _______________________________________________ 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)
