John, This makes no sense, if the charger stops only when *all* cells are being bypassed by the BMS, then no more energy will flow into the cells even if you would keep the charger on, since the bypass is supposed to avoid that any more charge will go into the cell! Apparently the BMS gives the signal too early and needs to be tweaked to signal to the charger only when indeed all cells are full, so you do not need to re-trigger the charger for a second round.
Since you did not specify how the BMS detects that it needs to start bypassing, nor the bypass current and charger current, it is difficult to judge what has allowed the pack to recover by re-triggering the charger a second round each day. It sounds like the design or the setup of your BMS did not remove imbalance after all, which is easy to achieve with settings just a little bit off and re-triggering a charger may give just a little extra push to tide the imbalance over into a balancing situation. Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Lindsay Sent: Monday, February 04, 2013 2:25 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Elcon PFC-2500 I do this on my LFP powered, Xivan charged, proprietary BMS commercial conversion. (It's a Blade Electron, sadly defunct conversion company. bev.com.au ) Over the last couple of months a regular daily extra charge triggered by a timer switch has really brought the batteries back to life after a near death experience. I can only assume this is equalizing the batteries because the charger stops as soon as all the cells are being bypassed by the BMS. John Lindsay On 05/02/2013, at 8:40 AM, "SLPinfo.org" <[email protected]> wrote: > Chuck, > > Well, that's essentially all I do now, and I'm fine with that as long as I > can do some regular equalizing to help extend the battery life. As a > non-engineer and non-hobbyist, my EV is my daily driver. I need it to be > there for me, and I don't like to have to think too much about it - I > actually got rid of my previous charger where I could set several different > things, because I felt like it was smarter than me (I never felt like I > fully understood what it was doing; my own limitations, not the charger's). > > Thanks for all the info. > > - Peter > > > > On Mon, Feb 4, 2013 at 10:51 AM, Roger Stockton <[email protected]>wrote: > >> SLPinfo.org wrote: >> >>> MY QUESTION WAS HOW WOULD YOU DO IT SPECIFICALLY WITH ONE OF THESE PFC >>> 2500s? I GOT THE IMPRESSION THAT THERE WAS NOTHING MUCH BESIDES PICKING >> A >>> PROFILE THAT YOU COULD SET, SO WHAT WOULD YOU HAVE TO DO TO EQUALIZE WITH >>> ONE OF THEM? >> >> The typical advice for an electronically-controlled/automatic type charger >> is that to perform an equalise you let the charger run to completion, then >> restart the charger and let it run a second time. >> >> Just how much additional charge this will deliver to the battery will >> depend on the profile that the charger uses, but this is generally your >> only option for an automatic charger. >> >> Cheers, >> >> Roger. >> >> _______________________________________________ >> 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/20130204/c632 4d81/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) > _______________________________________________ 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)
