How is the 12v battery charged? Is it from an alternator on the motor a la ICE or is it via a charger from the high voltage battery? I ask this as in these times when my eGolf will not be moving do I have to connect a float charger to the 12v battery or can I simply switch the car on to "ready" for (say) half an hour in order to ensure that the 12v battery does not go flat?
It does not have an alternator, that is certain.
I left my previous VW Golf GTE at the airport for two weeks while on holiday in the USA last year, and everything was fine !.
I am not sure if the 12 Volt battery is charged when the car is left standing for a number of weeks on the e.Golf.
Some EV cars automatically perform this function, some don’t.
Some of the one’s that do, have still reported occasions when the 12 Volt battery has been found to become flat after a period of time !.
It’s not completely flat, it has just fallen below the power required to kick in the HV side of the car.
On my present MG ZS EV your have to boot up the car to allow the HV battery to charge the 12 Volt lead acid battery.
So powering up the car once a week would be a good idea in my case.
Failing that, I could put a little juice back into the 12 Volt battery by using a smart trickle charger once a week ?.
I also have a small booster pack that I could use on the 12 Volt battery if necessary.
If the car is going to left unused for a couple of weeks, try and leave the HV battery at around 50 to 60% SOC.
Leaving the car for long periods of time at 100% SOC or even worse, leaving it at a very low SOC risks “bricking” the pack !.
If your car is now sitting with a high SOC right now, you could lower the SOC by booting up the car and running the heater etc for while.
I guess it helps if you car is fairly new, because the 12 Volt battery SHOULD be in good health.