Such are the perils of acquiring a commercial conversion when the manufacturer has collapsed.
John Lindsay On 05/02/2013, at 9:26 AM, Cor van de Water <[email protected]> wrote: > 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) > _______________________________________________ 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)
