There would be a mutiny if NA SRF premium owners could only charge at 3.3KW on L2 chargers (my home charger is rated at 7.7 and most around here are 7 - 10). I would accept having to use two ports for on the road 13.2 KW charging but NOT for 6.6. I still believe it was a mistake not having CCS charging and I am second guessing my order.
I got this from the SRF owners manual, regarding charging in Europe using the Mennekes standard:
Charging station requirements:
Single phase for Standard SR/F (single 3 kW charger)
3-Phase for Premium SR/F (to utilize second 3 kW
charger*
*Premium SR/F 3 kW charger utilizes power supplied from pin
specific to a 3-phase charging point.
On reviewing the US J1772 standard, it appears that it only supports a single phase AC supply:
https://en.wikipedia.org/wiki/SAE_J1772I think the on-board chargers are wired differently in the US so that they both draw from the same single phase, therefore both chargers are utilised when connecting to a single J plug.
The two different standards have created confusion. It's only here in Europe, for those of us using the Mennekes standard, that can only charge at 3kW from a 7kW post.
In the US, you can use a Y-adapter to combine the power from two J plugs and charge at 12kW if you have the charge tank fitted.
I hope that helps.