Well I assumed by disconnect you meant a manual one (e.g. big on/off switch), which would still have to take all the power required through it. That'd be the service disconnect I linked from EV West. The battery management system would control the contactor, which also switches all of the required power for your application, and that would handle over temp, over voltage, under voltage, etc. fault conditions. None of those *should* happen in a well designed system, so it shouldn't need to hard-switch hundreds of amps, but it should be designed to be able to without welding contacts shut or arcing etc., and that's why you need a proper high voltage/high current DC contactor, and not just a big relay that technically can handle hundreds of amps.
- Justin On Sun, Apr 19, 2020 at 7:55 PM Peri Hartman <[email protected]> wrote: > Why shouldn't I use a disconnect. Or am I using the wrong term: > something like a contactor that breaks the power connection if the temp > rises too much. I'm figuring I'll need two: one for the load and one for > the charger power. The latter should be easy: 120VAC, 15A. > > With 6kW or more, if something goes wrong, there'll be a lot of heat in > the wrong place. > > Peri > > ------ Original Message ------ > From: "jkenny23 via EV" <[email protected]> > To: [email protected] > Cc: "jkenny23" <[email protected]> > Sent: 19-Apr-20 6:16:39 PM > Subject: Re: [EVDL] custom battery > > >Well you shouldn't need to use the disconnects; but yes, those amperage > >levels are used commonly in EVs of course. EV West has pretty good prices > >for stuff like this (service disconnect, rated for max current your system > >would see): > > > https://www.evwest.com/catalog/product_info.php?cPath=2_42&products_id=267&osCsid=na4hdbkd5u5i6u7ne1lltda641 > > > >And here's an example of the contactor you'd need to control with the BMS > >(quite cheap for this model, good deal actually): > >https://www.ebay.com/itm/293546196201 > > > >-- > >Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > >_______________________________________________ > >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > >ARCHIVE: http://www.evdl.org/archive/index.html > >INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > >Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200419/ce197a5b/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
