You could be a rebel and do no BMS. Jack Rickard at http://evtv.me bottom balances his cells and then runs no BMS. He says he has driven until the car refused to move without apparent damage (though he admits there could be less long term cycle life). BTW Jack argues the low end is more important, as you might suddenly pull a cell too low whilst pulling 100's of Amps, ruining it in seconds. Charging is at 10's of Amps so is less likely to do damage suddenly. I know many here disagree with Jack. ----- Original Message ----- From: Steve Powers Sent: 09/03/13 05:37 PM To: [email protected] Subject: Re: [EVDL] 18650 battery for EV use. Recommendations?
... 2) The large format Li Ion batts aren't off the table. A decent sized pack can be bought for around $5k. But someone needs to find a cheap way to make a reliable (even if dumb) BMS. The charger cutoff is relatively simple, but if you aren't a EE, anything electrical like this turns into a project that you need lots of help for. It's above my head even to make the charger cutoff switch more or less a BMS, unless someone gives me an exact parts list and schematic. ... -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130905/7bc27085/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
