I recently downloaded the latest update for "bug fixes" and this whole past week my standby usage has shot up to about 3% for a 9 hr day.
If cabin overheat protection is off- It looks like the car doesnt sleep.
My 2021 M3P (facelift) without the AMD ryzen draws about 200W awake.
Thats 5kWh / 24h. —> about 6-8% per day, depending on the batt capacity.
I always restart the car via the menu —> security —> Shut down the car after a softare update.
I had the car not sleeping after an update early in the ownership, I also had the car not charging per schedule with the WC red after two updates ( before I started shut it down).
More recently my wife had installed an update which I was not a aware of and then
the car wasn’t sleeping again.
I’m not saying this must be the case but I think a restart after each update bu shutting down is good or at least wont be bad.
My car do not loose any charge after a 9hr parking. In most cases I can leave it at work for a whole week or part of the week with the same SOC number showing.
When the car sleeps (within 10-15minutes) after parking the consumption is very very low.
Something that often is misinterpreted as SOC usage /consumption when parked is that the car might have an overestimate of the battery capacity, leading to a SOC adjustment downswards after parking.
I do not think I can show any example of this, as my car often has been spot on or underestimated the capacity.
This is how it looks when the SOC adjusts upwards due to a underestimate of the capacity:
Parked at 35.63%, did start the sleep at 37%. Se can see the SOC rising just before the sleep (left most S)
Like that but the other way around and 1% loss in the SOC adjustment would not be uncommon.
1% readjusted SOC after the parking and 2% loss due to not sleeping would set the 3% loss.
