Lawrence, Think about it - parallel cells have by definition the same voltage and share the current, so one regulator monitors a parallel set of cells as if it were a single cell with capacity of the total set.
Only if you do separate strings (single cells in series) and parallel those strings, would you need to monitor each cells, as two adjacent cells are not interconnected (each in their own string) so they do not share voltage and current other than whatever flows through each individual string. Buddy-paired cells are acting like single cells with double capacity and I believe that is what you planned to do? Hope this clarifies, Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.com Skype: cor_van_de_water XoIP: +31877841130 Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 -----Original Message----- From: [email protected] on behalf of Lawrence Rhodes Sent: Thu 4/3/2014 5:58 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] BMS for leaf cells Can one regulator monitor multiple cells in parallel? That is if you have four strings of twenty lets say would you need 20 or 80 units? Lawrence Rhodes... >________________________________ > From: David Rees <[email protected]> >To: Lawrence Rhodes <[email protected]>; Electric Vehicle Discussion >List <[email protected]> >Sent: Thursday, April 3, 2014 11:55 AM >Subject: Re: [EVDL] BMS for leaf cells > > >On Thu, Apr 3, 2014 at 10:37 AM, Lawrence Rhodes > ><[email protected]> wrote: >> I got a deal for a Leaf pack for 2500 dollars. However I've gotten an >> estimate for >> thousands for the BMS. Is there a reliable BMS I don't have to spend >> thousands >> on? Will be dividing up the pack into strings of parallel and series to >> make 156vdc >> after charging. > >MiniBMS would be an option if it supported different voltage cutoffs >(does it? I don't know). But even then you need 48 cell-modules if you >split the pack in half which is going to cost you about $700. > >-Dave > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140403/305124ad/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)
