As far as I can see, the Leaf charges the 12V battery until the charge current into the battery drops below a certain level, I forget if it was 10A. This is the death of a lot of Leaf batteries: as they slowly age, the internal resistance goes up and even though they are far from being full, in fact they may not even have a 50% charge, but the charging current that is based on the small voltage difference between the battery and the DC/DC converter at 14V, falls below 10 Amps and the DC/DC drops to "charge maintenance" voltage of ~13V which means that the battery never gets charged. If I hook up an external 14V power supply, it will continue charging the aux battery for several hours until it finally tapers off and the next morning I see less than 0.2A on the power supply, because the aux battery is finally fully charged again. I need to do this every ~2 weeks or the aux battery will die on me from not being properly charged by the Leaf. NOTE that I run a much smaller battery than OEM, which adds to the problem. But yeah, increasing battery size should be fine by the Leaf, its ~100A DC/DC will just take longer to recharge the battery - either from the J1772 charger directly or from the battery pack.
On Tue, Sep 17, 2024 at 8:49 PM redscooter via EV <ev@lists.evdl.org> wrote: > > I thinking of having extra batteries in the 12 volt system so I can > have extra capacity to run 12 volt inveter with out using traction > battery. I have like an other 300 amps hours 12 volt to have the car > charge while normally charging. > > but will car the stop charging the 12 volt adtional batteries after a > certin time or amp hour limit. > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
