I am designing and building my own. Despite what you might hear it isn’t rocket science. Should be done in the next six months. It is the last thing I am worried about. Mark From: Dan Baker [mailto:[email protected]] Sent: Tuesday, March 09, 2021 7:50 AM To: Mark Grasser Cc: Electric Vehicle Discussion List Subject: Re: [EVDL] Volt module details. 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 <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210309/aaa6c315/attachment.html> /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/20210309/0c271c2a/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
