The signalling would not necessarily have to be proprietary. I suspect it's using a standard pilot signal to charge at 13A from all 3 phases. It's pulling 40A from the wall so they call it a 40A Wall Connector. This is speculation on my part based on the way Tesla does things. I suspect the other vehicles won't charge because their on-board chargers depend on proper timing of each phase.
I agree that would be sensible. The weird thing is, of course, that the car display says 'single phase 40A' when charging from these wall connectors. I guess they could have fudged the software to display 3x13A as 40A, or magically determine the three phase lines are all the same phase, but that seems really klunky.
If you plug into a three phase 32A, it says "(3) 32A". If you plug into a tesla wall connector, it says "40A".
I think you are right - try it and see. Perhaps one of the users in Europe can, as the Tesla 40A wall connector is supposedly the same there?
I thought the promised HPWC for HK/EU/AUS was going to be 3-ph 32A to match the 22kW full capacity of the Model S in those markets. I also thought that it was recently released ...indeed, your fellow HK Model S owner has one.
What happened to the promised 32 amp 3 phase wall charger from Tesla?
Tesla originally promised, to buyers of cars with twin chargers, a choice of two HPWC versions:
- Single phase 80A
- Three phase 32A
They also promised a 40A wall connector for buyers of cars with single chargers, and as a temporary loan to others waiting for the HPWC.
To complicate matters, they delivered 32A limited wall connectors initially. Those have since been upgraded (swapped) to 40A models.
And this is all further complicated by the weird internal three phase charger arrangement, so that single charger cars using 32A single phase public chargers only got 16A. That was the situation up until recently, when Tesla started delivering cars with new single chargers equipped with internal relays to dynamically re-wire the incoming power so recent cars here can get the full 32A from 32A single phase public chargers. Supposedly in UK they shipped the cars with dual chargers anyway, but somehow software limited to 40A?, to get around this limitation.
You can read the whole messy history of Hong Kong here:
Hong Kong Tesla Model S Charging Standard
Tesla have just now started to ship some 3 phase 32A wall connectors to dual charger equipped owners. The single phase 80A/70A/63A version is still MIA.