That's right. You have to have an EVSE that is properly configured to operate at 120 volts and signal the car that the higher current is available. A Jesla with a TT-30 to 14-50 adapter will do that. Even though the car is being told it can draw 40 amps, it will only draw 20, so it is safe.smkettner said:20 amps max at 120 volts. OEM charge cord is only 12 amps.