The < 10mA bypass capability of the Leaf BMS is the reason that it is working ALL THE TIME, as long as there is 12V battery power. And yes, it *does* keep that whole pack in balance, since good cells have less than a few mA self discharge. I actually run 2 Leaf BMS’es in my EV truck and they keep both Leaf packs nicely balanced. Cor.
Sent from Mail for Windows 10 From: George Tyler via EV Sent: Tuesday, August 13, 2019 9:14 PM To: Mr. Sharkey via EV Cc: George Tyler Subject: [EVDL] Leaf BMS Has anyone had a good look at the operation of the Leaf BMS. Circuit is very different, and so is the operation. First thing I noticed when I got leafspy was that the BMS works ALL the time, not just above a certain voltage. Leafspy also shows it working on the lowest cells, so it's not just a shunt? the circuit shows inductors in series with all measuring wires to the batteries, both sides of each cell. These points are then coupled together by capacitors, the whole pack. My thinking is that this could be energy transfer path between any cells and multiple at the same time. This count be done via half bridge inverters on each of the wires. I have searched, but find nothing, apart from some comments that it is a small surface mount resistor that is the shunt, and only 7.5 mA. That would actually do nothing for a 60ah battery. On 14-Aug-19 3:06 PM, Mr. Sharkey via EV wrote: > >> A URL or name for this company would be appreciated. > > Try this, although it seems some of the products are > discontinued/out-of-stock: > > https://evparts.com.au/ev-power-bms.html > > >> Let me know once you have a few extra to sell. > > This will likely be a fall/winter project, once the year's firewood is > put up and the outdoor chores cease due to the weather. > > Another part of the repower project is going to be to rework a Todd > Power Source to be a lithium-compatible 36v charger. I'll probably run > barefoot without a BMS in the short term and carefully balance and > charge manually until I get something worked out. > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at 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 Please discuss EV drag racing at 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/20190813/8b78bd45/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
