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)
