Seattle Tom
Member
I've never come across a Tesla Supercharger that was powered by 120/208. On V2 and Urban sites, the individual chargers within each charging cabinet are each powered by one leg of 277 volts (actually 280ish because most V2 sites are boosted to just over 500 volts incoming AC. There are 12 chargers in four groups of three - each charger in a group is on a different phase. Trying to do that with 120-volt legs would reduce the output substantially since the chargers can only handle just over 40 amps each.