Simple question. Confirm? 1) There is a BMS module on each battery block. 2) Even if not connected to the BMS comm cable the minimum BMS chip across each cell does provide a very small amount of overvotage cell balancing if a cell starts to move above a crticical voltage. 3) It can NOT actively bypass excessive charge current because the resistor is too smalll, but it can protect against slight over voltage. 4) Especially if the overall charge voltage is kept well below the 4.0v per cell (as measured at the battery level)...
Bob On Sat, Mar 6, 2021 at 8:53 AM Dan Baker via EV <ev@lists.evdl.org> wrote: > Words to live by Alan. Hence the ask what BMS folks are using with Volt > packs. So far the majority I have heard is no BMS. And I have seen lots > of folks use a less than great BMS, it malfunction, drain and kill the > pack. The Orion and Dilithium kits look like good quality but would likely > cost as much as the volt pack I just bought. I think if I could find a > inexpensive BMS that is very low overhead and just alarms when things go > out of range would be good enough. Would love to know some good examples? > > Thanks > Dan > > On Sat., Mar. 6, 2021, 5:15 a.m. Alan Arrison via EV, <ev@lists.evdl.org> > wrote: > > > You've heard it before, but here it is again. > > > > Proceed without a BMS at your own peril. > > > > Best case, you ruin some expensive cells. > > > > Worst case, you burn your house down. > > > > Al > > > > On 3/5/2021 9:31 AM, Dan Baker via EV wrote: > > > Thanks Jerry for your practical use of parallel pack info using Volt > > > batts! Bummer on the trike - glad you are ok! Did you just use a > fixed > > > charge connected to all the packs , no diodes or contactors? It seems > > more > > > ppl are using Volt packs without any BMS than those that use one. I'm > > going > > > to be squeezing these Volt packs a little harder than stock though- > think > > > the cells might get out of balance more? The pack is going in a big > > boat > > > and I would like to see 100hp (or ~ 450 amps @ 162V) for a few fun > pulls. > > > Boats are like cars except they are always going uphill, no regen or a > > > break in power until the cruise is over. So yes going to use their > built > > > in cooling if possible. > > > > > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > ARCHIVE: http://www.evdl.org/archive/ > > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210306/1a738f8b/attachment.html > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210306/1da3902e/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
