MyNissanLeaf does have schematics (reverse engineered) of the Leaf BMS and yes, the 430 Ohm resistors are the bypass resistors. Cor.
On Wed, Aug 14, 2019, 1:08 AM George Tyler via EV <ev@lists.evdl.org> wrote: > This is what I found there, other forums say something similar. > "Shunt resisters are 430 ohm across each set of cells. When shunting > they draw V^2/R power, or roughly 16/430 or 40 mW each. There are 96 > sets of cells, so if all but one was active, total power would be about > 3.5 watts." > I suspect that the 420 ohm resistor is not a shunt load. Have you seen > the circuit? > > > On 14-Aug-19 4:22 PM, Bob Bath via EV wrote: > > George, probably a stupid question, but I’m gathering you’ve already > been on mynissanleaf.com? I don’t know if the moderators pull anything > like that off immediately, but I look fwd to hearing what others have to > say about this... > > > > Sincerely, > > Bob Bath > > > > Note: any misspellings of the contents of this message are due to 54 > y.o. vision, hyperactive spell check changing what I typed, or fat > fingering— not cluelessness. > > > > > >> On Aug 13, 2019, at 9:14 PM, George Tyler via EV <ev@lists.evdl.org> > wrote: > >> > >> 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) > >> > > _______________________________________________ > > 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/20190814/44a27670/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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190814/e31c7684/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)
