Battery drain - what is causing it?

[Dschubba]

Correction vin was 21170 approx with an R for 2024

 

[onuraiu]

Update to my "case", today is 25th of July and dealer measured (my Victron totally disconnected):

So 5 days ago those numbers were:
main: 12.5V
aux: 12.84V

Now those are:
main: 12.8V
aux: 12.39V

meaning, main battery went low and was charged from aux.
main: 12.5V +0.3V -> 12.8V
aux: 12.84V -0.45V -> 12.39V

To sum up, according to dealer that is all OK and nothing is wrong.

 

[onuraiu]

So after I got my car back, I planned to do a longer idle test at home, but unfortunately my neighbour got stuck in forrest with his range rover and needed help from my Track-Thor .
Anyway 29th of July at 8.40am I had disconnected my victron and aux battery (took off the cables from battery) - so there wasn't any my own things connected to the car and also charging from aux battery was disabled, as aux battery was not connected anymore.. Although I didn't know how to disable c.tech device..
I measured voltages:
main battery 12,68V
aux battery 12,94V
I locked the car from remote.

On the 1st of August at 3.45pm (3 days 7h 5min later), I opened the car from remote and measured voltages again:
main battery 12,27V (0.41V drop)
aux battery 12,85 (0.09V drop)

So during that 3d and 7h, main battery lost 0.41V... my calculation tell me that, if I go to airport and leave my car there approx 3 weeks and return, then most probably I won't be driving home without help from booster...

Next I'll swap batteries when longer idle period comes again.

 

[Dschubba]

So after I got my car back, I planned to do a longer idle test at home, but unfortunately my neighbour got stuck in forrest with his range rover and needed help from my Track-Thor .
Anyway 29th of July at 8.40am I had disconnected my victron and aux battery (took off the cables from battery) - so there wasn't any my own things connected to the car and also charging from aux battery was disabled, as aux battery was not connected anymore.. Although I didn't know how to disable c.tech device..
I measured voltages:
main battery 12,68V
aux battery 12,94V
I locked the car from remote.

On the 1st of August at 3.45pm (3 days 7h 5min later), I opened the car from remote and measured voltages again:
main battery 12,27V (0.41V drop)
aux battery 12,85 (0.09V drop)

So during that 3d and 7h, main battery lost 0.41V... my calculation tell me that, if I go to airport and leave my car there approx 3 weeks and return, then most probably I won't be driving home without help from booster...

Next I'll swap batteries when longer idle period comes again.

The aux battery does a good job of starting the car if the main one goes flat