On our ZS EV Trophy LR ( collected in March 22 ) the 12 volt battery voltage does shift around a little, but I guess this is to be expected, given what charge rate is being demanded to satisfy the required SOC at that required time ?.
Parked and at rest, according to the App - It alternates from 13.1 - 13 .3 volts.
This slowly increases to around 14 .1 volts, with the car is in READY mode and therefore receiving a charge from the inverter / HV pack ( with car at a standing still ).
On the move, it is around 14.1 - 14.5 volts.
Too be totally honest, because the 12 volt battery status is not the default screen on the ZS EV Gen 2 - I am not checking it as often as I should do !.
On the Gen 1 - The 12 voltage battery status gauge was permanent displayed in the dash panel, so very difficult to disregard really.
The highest voltage I have even seen it report was when it was pulling a charge from our wall box and it achieved 14.8 Volts according to the App ( See photo below ).
But we know that these figures can be a little different to what we actually seen inside of the car.
E.G. - If I check the predicted range after charging to 80% overnight, the App will display a range of 212 miles.
If I enter the car, it actually predicts a range of 211 miles, this is a regular feature.
As when the App reports that the sky roof is some times open when it is clearly is not and omits to report the either the ambient temp or the temp inside of the cabin on the first pass of the health check.
Rerunning the health check for the second time usually corrects this information.
The electric window status was removed I believe, because it gave too many incorrect status reports on their open / closed condition.