CCU only controls the communication between the BMS, battery and charger.
What you're talking about is the DC-DC convertor, which takes 400V DC and turns it into 14V DC to charge the 12V battery.
If you go to a dealer and pay for a service they'll do any recall updates.
The Comfort update you do have to pay for as it wasn't a safety issue more of a nice to have.
The nexas nexlink is classed as an insecure ODB2 scanner as it uses 1234 or 0000 as its access code and according to the manufacturer will allow for more than one device to connect so any time the port is energised such as using iSmart the ODB2 scanner can be connected to by anyone in Bluetooth...
Alot of obd2 scanners utilise information of questionable origin from the original ELM327 scanners and that's where some issues come from as they're not complete implementations of the scanner they're a dodgy copy of
The 12v battery controls everything in the car so while V2L is in use the 12v is being used to run all the control units and contactors.
The HV battery literally just powers the drive train and HV battery heater, and is used by the OBC to power devices by V2L but the actual control modules for...
Average expected loses on an AC charger are between 8-13% dependant on:
Ambient temperature
Incoming voltage level to property
Quality of cabling supplying charger and charge cable
The MG mode 2 charger "granny" is limited to 10A for this reason, most marque supplied chargers are 13A rated which is the issue as UK outlets and plugs aren't rated for 13A continuous but 10A is fine unless there a fault or high resistance connection on the system already.
Becareful selling the granny charger if it came with the car as it is part of the spec and would he viewed as failure to return the rejected car completely.
Didn't pick up on that about granny not working, so could definitely be an earthing issue.
If the house is TN-C-S (PME) I can't see there being an earthing issue if they're getting circa 240v in the house as the earth and neutral are the same conductor.
If the house is TN-C-S (SNE) the PILC or...
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