Thanks Mark! What BMS are you using to top balance? On Tue, Mar 9, 2021 at 9:42 AM Mark Grasser <[email protected]> wrote:
> I am building my EV around used Chevy volt batteries. To me it is a no > brainer. They are lighter, smaller, inexpensive, water cooled / heated, > bolt > together, will be relatively easy to top balance. To be honest, I see no > issues. > Mark Grasser > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of Dan Baker via EV > Sent: Tuesday, March 09, 2021 7:32 AM > To: Electric Vehicle Discussion List > Cc: Dan Baker > Subject: Re: [EVDL] Volt module details. > > Hey David > Thanks for commenting in. But what you said above could also be applied to > any home built EV - don't build one as it likely isn't safe. No one is > really collecting enough data to answer either questions. > I build or try to build my boats to the ABYC standards in which I was > certified a few years back. ABYC standards are much more stringent around > electrical standards then most automotive ones. I can't find anything in > the standards yet around Lithium & BMS but I imagine one would be required. > So back to my BNS question - anyone else here running a BMS on their Volt > packs or have any parallel pack experience? I'm looking more closely now > at the Dilithium kits from Thunderstruck. But where the Volt packs are > really robust do I really need a full feature BMS, is there a good one out > there that just displays/ alarms when pack is in danger? The china battery > pack I currently own has a full BMS but the discharge output is limited to > about 150 amp continuous, anything above that the BMS module relays or > circuits get too warm and it cuts out. I can limit current output on the > controller instead with my newer setup and watch battery temps. > > Thanks again for all the great comments and help so far! > Dan > > On Mon, Mar 8, 2021 at 10:28 PM EVDL Administrator via EV > <[email protected]> > wrote: > > > Jerry, as media folks like to say, "the plural of anecdote is not data." > > > > What you've given us is an anecdote, your own limited experience. > > Unfortunately that's not really useful statistical data on the safety - > or > > hazard - of Volt batteries without BMSes in situations that may be very > > different from yours. > > > > Probably thousands of people put pennies under their fuses (or swapped 15 > > amp for 30 amp) and never had a fire because they never actually > > overloaded > > the circuits. So would you say there also that "at some point one has to > > admit that is how it is vs previous thoughts"? > > > > A BMS is similar. If everything goes right, you may never have a > > problem. > > That doesn't mean that it's safe, any more than overfusing is safe. > > > > The EVDL is a public forum that's archived in several different places on > > the web. This isn't 1999 any more and in the interest of your own legal > > safety I suggest that you be a little bit cautious about what you write > > here. > > > > I won't say you shouldn't cite your own experience - quite the opposite. > > I > > think it's definitely worth reporting it, even though I personally > > wouldn't > > do the same. > > > > However, I strongly suggest that you add a disclaimer stating that this > is > > your experience only, and that battery and automotive engineers don't > > consider it safe to use a lithium battery without a proven reliable BMS. > > > > David Roden, EVDL moderator & general lackey > > > > To reach me, don't reply to this message; I won't get it. Use my > > offlist address here : http://evdl.org/help/index.html#supt > > > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > I asked a man in prison once how he happened to be there and > > he said he had stolen a pair of shoes. I told him if he had > > stolen a railroad he would be a United States Senator. > > > > -- Mary Harris Jones > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > > _______________________________________________ > > 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/20210309/aaa6c315 > /attachment.html > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210309/aaa6c315/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/20210309/e33205aa/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
