Battery management issues VW New California T7

[Lebuha]

Today we finally got a complete status on the car. It only took 6 weeks. What happened is: The 12V battery and the camping battery have been running low and at one point the high-voltage battery / hybrid battery has started to charge these two batteries. But it has sent 200 (two hundred) amps and has blown two fuse boxes. So these two fuse boxes need to be replaced along with some connectors. They have been ordered but it is not known when they will arrive.
As I understand it, we are dealing with two different faults. One is that the 12V battery and the camping battery are discharging too quickly, the other is that the high-voltage battery is sending out too much energy to charge the 12V battery and the camping battery.
So now we are still waiting for the car to be ready.

 

[burton61]

Today we finally got a complete status on the car. It only took 6 weeks. What happened is: The 12V battery and the camping battery have been running low and at one point the high-voltage battery / hybrid battery has started to charge these two batteries. But it has sent 200 (two hundred) amps and has blown two fuse boxes. So these two fuse boxes need to be replaced along with some connectors. They have been ordered but it is not known when they will arrive.
As I understand it, we are dealing with two different faults. One is that the 12V battery and the camping battery are discharging too quickly, the other is that the high-voltage battery is sending out too much energy to charge the 12V battery and the camping battery.
So now we are still waiting for the car to be ready.

I will need to look back in case I missed something but I was under the impression that the high voltage battery was not connected/ not charging the leisure batteries or starter battery. If it was that would mean you could effectively use your high voltage battery for camping by allowing it to charge your leisure batteries. I understood VW specifically did not allow that configuration and the high voltage battery was only used for stationary/ camping aircon and heating (30 min durations).

Or are they reporting to you that there is a fault that the high voltage battery is charging the other batteries and also with high current? mmm?

 

[sticky1]

Today we finally got a complete status on the car. It only took 6 weeks. What happened is: The 12V battery and the camping battery have been running low and at one point the high-voltage battery / hybrid battery has started to charge these two batteries. But it has sent 200 (two hundred) amps and has blown two fuse boxes. So these two fuse boxes need to be replaced along with some connectors. They have been ordered but it is not known when they will arrive.
As I understand it, we are dealing with two different faults. One is that the 12V battery and the camping battery are discharging too quickly, the other is that the high-voltage battery is sending out too much energy to charge the 12V battery and the camping battery.
So now we are still waiting for the car to be ready.

Interesting set of faults.
I think everyone is seeing the starter battery drain quickly, some more than others.
It looks like you are also saying the leisure battery is also draining - did they know what is drawing the load.
I can only find the wiring that seems to come from the alternator. As far as I can tell everything in the back of the van draws from the leisure batteries. I need to double check the lighting in the rear.
It would make perfect sense to use the EV battery to charge the leisure battery but there will need to be some clever electronics to cope with the different chemistries and capacities.

 

[Californication69]

Today we finally got a complete status on the car. It only took 6 weeks. What happened is: The 12V battery and the camping battery have been running low and at one point the high-voltage battery / hybrid battery has started to charge these two batteries. But it has sent 200 (two hundred) amps and has blown two fuse boxes. So these two fuse boxes need to be replaced along with some connectors. They have been ordered but it is not known when they will arrive.
As I understand it, we are dealing with two different faults. One is that the 12V battery and the camping battery are discharging too quickly, the other is that the high-voltage battery is sending out too much energy to charge the 12V battery and the camping battery.
So now we are still waiting for the car to be ready.

Tak from Copenhagen this Evening !
This is really good information.
Would be nice to have some definitive answers from VW as to how the battery (EV, Starter & Lesuire) interact with each other.
My understanding is that VW don’t have a clue how it works to be honest.
Looks like we could have a clearer picture emerging from the Dansker, which wouldn’t surprise me tbh.
They know their stuff.
Their knowledge with electrical testing equipment ‘tis legendary, way faster than VW can find the blueprints

 

[sticky1]

What I don’t understand is that the hybrid multivan has been around for some time so surely the only addition is the leisure batteries in the back.