I've found that the Leaf main pack holds charge quite well, at least on early Gen 1, even if left disconnected from an EVSE for an extended period of time.
There do not appear to be vampire losses that are able to discharge the main pack when the car is off. They can only discharge the 12v. The car does not automatically recharge the 12v using the main pack. A dead 12v on a Leaf is an inconvenience, but it's pretty easy to use the emergency key built into the fob to get into the car, and then later apply a small jump pack to wake the Leaf back up (so that the DC/DC will charge the 12v). (Note: there are some caveats with using DCFC on at least some Leaf years in the sense that you can deplete the 12v after the DCFC completes, because the DC/DC shuts off upon DCFC completion.) This is unlike on a Tesla Model S and newer, where the 12v is monitored by the car. Then, as needed, the 12v is regularly topped off by the DC/DC converter running off the main pack, which in turn will discharge the main pack down to 5% or so before the car leaves the 12v to die. The remaining capacity on the Tesla main pack is reserved for driving to the nearest charger and for bricking prevention. Bricking protection didn't exist on the original Tesla Roadster; leaving one of those away from charging too long could ruin the pack. A Tesla with a dead 12v battery is trickier to get going than a Leaf, starting out with there being no physical key to unlock the car. The exact recovery procedure varies by vehicle model and year. On Tue, Feb 15, 2022, 12:36 redscooter via EV <ev@lists.evdl.org> wrote: > I'm thinking getting leafs from salvage yards, some pics show dash > working some and others show the front is so beat up thast the 12 volt > battery is probally disconnected. BUT is there any way that the HV pack > could be drained to death ? and be worthless? theres 2018's have only > 10 > k miles so they shouild be good for a donor pack .. are there pack relays > powered down in case of an acident, like when air bags go off ? > _______________________________________________ > 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/20220215/6502b0e1/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
