what is the "load dump" problem? Bob
On Tue, Apr 20, 2021 at 11:04 PM (-Phil-) via EV <ev@lists.evdl.org> wrote: > > I have definitely seen failures of the DC-DC (PCS) in Tesla Model 3's from > people installing aftermarket Lithiums. The load dump problem is real! I > have one sitting here that I did an autopsy of. (Blown FETs on the primary > side, that then took out the HV feed into the PCS) > > A PCS failure in the Model 3/Y takes out the entire charging system, so > maybe not as expensive as in a Leaf, but still not worth it! > > On Tue, Apr 20, 2021 at 7:14 PM Lee Hart via EV <ev@lists.evdl.org> wrote: > > > Lawrence Rhodes via EV wrote: > > > https://mynissanleaf.com/viewtopic.php?t=22752 According to these guys > > a lead battery is not what a Leaf needs. Seems a lithium of some sort would > > do great. Another site said the DC/DC converter can put out as much as > > 120amps. The brakes and other systems that run on the 12v system might need > > a boost if the battery fails and braking is very important. After finding > > out that the lead battery is under charged I suspect an undercharged > > lithium battery might fair much better and for longer. Lawrence Rhodes > > > > I don't "buy" it, Lawrence. Too many of his comments are just opinions; > > not facts. Just a few glaring points: > > > > - A 12v battery *will* reach full charge at 13.0v; it just takes a long > > time (like a week or so). > > - He ignores temperature compensation. The Leaf does temperature > > compensate its charging. > > - He ignores aging. The older the battery, the lower its basic charging > > voltage. > > - 14.4v will easily fully charge a 12v battery. Remember, if it's > > holding the battery at around 13.0v, it's already close to full; so it > > takes very little time at 14.4v to finish the job. > > > > Lee > > > > -- > > A designer knows he has achieved perfection not when there is > > nothing left to add, but when there is nothing left to take away. > > -- Antoine de Saint Exupery > > -- > > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > > > > -- > > This email has been checked for viruses by Avast antivirus software. > > https://www.avast.com/antivirus > > > > _______________________________________________ > > Address messages to ev@lists.evdl.org > > No other addresses in TO and CC fields > > 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/20210420/6aeee3ed/attachment.html> > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > 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 _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields 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
