This is the correct answer, and can we take future discussion of this to the appropriate thread?The port on the Tesla Semi is a MCS, prototype v2, and the MCS spec does not support AC charging. You would have to have a second charge port for AC, which apparently the Semi doesn't have.
If it were to have AC charging, the only port type that would make sense is a Type 2, J3068, which supports three-phase AC. (This is the standard AC connector in most of the rest of the world.) I think this supports up to ~50kW. (63A three phase AC)
Tesla Semi
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