You cannot run on DC-DC alone, You still need a 12v battery to stiffen the 12v bus, provide load dump capability, and emergency power for braking/steering should the HV system fault.
On Wed, Dec 16, 2020 at 2:05 PM Peri Hartman via EV <[email protected]> wrote: > My thoughts: the moment you have something turn on automatically, you > run the risk it won't turn off later, or won't turn off if there's a > problem. At that point, you effectively have no contactors. Do we agree > that having contactors is a good idea ? > > If you're in the EV, you have the option of stopping and getting out and > calling for help if there's a problem. If it's unattended... > > Peri > > << Annoyed by leaf blowers ? https://quietcleanseattle.org/ >> > > ------ Original Message ------ > From: "Ken Olum via EV" <[email protected]> > To: [email protected] > Cc: "Ken Olum" <[email protected]> > Sent: 16-Dec-20 1:45:59 PM > Subject: Re: [EVDL] Leaf 12 v battery. > > > From: Jay Summet <[email protected]> > > Date: Tue, 15 Dec 2020 20:05:14 -0500 > > > > The reason the DC2DC converter does NOT run all the time is that (for > > safety) Nissan has chosen to disconnect the HV battery from the rest > of > > the car (with contactors inside the main battery) whenever the car is > > turned off. > > > >What danger are they concerned with? I would say that most bad things > >happen to cars when they are in motion, when you have to have the HV > >system on. I suppose if they're concerned with some hobbyist getting > >electrocuted while working on the car then their strategy makes sense. > >Also perhaps for the maintenance you'd like to shut off the HV system > >without shutting off the 12V. > > > >Peri's idea of putting the DC/DC in the HV box seems like an > >interesting solution to these problems. > > > > Ken > >_______________________________________________ > >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) > > > > _______________________________________________ > 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/20201216/e40d0a46/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)
