The best way to do a parallel setup is cell buddy-pairs if possible. There is no problem doing it this way. Could also "cheat" with 2 separate strings by tying the cell taps together as stiffly as practical.
On Sat, Oct 8, 2022 at 4:57 PM John Lussmyer via EV <ev@lists.evdl.org> wrote: > I've been looking into both Thunderstruck and Orion BMS docs. > One interesting doc is from Orion - describing the possible issues with > parallel strings (which I will have), and some possible mitigation > strategies. > https://www.orionbms.com/manuals/pdf/parallel_strings.pdf > I'm thinking about the one on page 14 - Paralleled strings with two > separate DC busses > Since I'll have 2 strings, this would entail a couple more contactors > and some BIG diodes. > a pair of 300A+ ones for the discharge side, and a pair of 50A ones on > the charge side. (probably about $100 of diodes from digikey) > > Though, I'm not sure i'd use contactors on the charger side, instead I'd > just have it shut the charger off and notify me that it happened. (hmm, > might allow a single string to shut off - but if the 2nd string does it > would shut the charger down instead.) > > An Orion (pair) could shutdown each side independently, the > Thunderstruck can probably only shutdown one side. > > Any thoughts on either system, or the parallel string setup? > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20221008/c9a7d607/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
