It is true that an EVSE that is connected to a higher power circuit will work fine. A 16A EVSE will draw 16A from any circuit that exceeds 16A. It will still draw 16A from the spec max of 80A.
To avoid over heating and fulfill the NEC ratings is must be greater than 20A (16A is 80% of 20A).
To avoid over heating and fulfill the NEC ratings is must be greater than 20A (16A is 80% of 20A).