Teslas watch the 12v battery SoC, and when it gets too low from sitting it will wake the car for about 2 hours and give the 12v a full complete charge. Usually this is about 2x a week if the car is left sitting. (Assuming you don't have Sentry mode on, which keeps the HV awake)
On Sat, Aug 1, 2026 at 10:55 AM List Lackey via EV <[email protected]> wrote: > On 1 Aug 2026 at 9:57, Darryl McMahon via EV wrote: > > > It didn't occur to me to put one on the Leaf due to the big DC-DC > > converter from the traction pack that should be maintaining the 12-volt > > auxiliary. > > That may not be the kind of maintenance you want. > > For several months I'd go out to the garage and sometimes, especially in > the > wee hours, find our Renault Zoe (your Leaf's cousin) humming faintly to > itself, its instrument pod lit up. If I opened and closed the driver's > door, > a minute or two later I'd hear the contactors open and the car would go > back > to sleep. > > I finally thought to measure the open circuit voltage of the house > battery. > > Ah. > > Changing the then-5-year-old SLI lead battery put paid to the car's > insomnia. > > It also stopped the concerning drain on the main battery, which in one > case I > saw lose ~2% of its charge over about a week without being driven. > > David Roden, EVDL moderator & general lackey
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