That's interesting! I installed the charger at our shop, where we have both 120/208Y and 277/480Y panels. I connected it to a 120/208 panel, two legs on a dual pole 60A breaker are delivering ~ 215VAC single phase power to the wall charger. The manual says it is to be hooked up to 208V - 250V single phase, so I did not think of connecting to to 277V.
Would you mind sending me a link to the thread where you read this? Has anyone had any bad results?
If 277V makes that much of a difference, individuals who only have single phase could install a couple of buck/boost transformers 'in front' of their wall charger and take their single phase 240VAC up to 277VAC. My only concern is damaging the charger, or worse, the batteries.
Thanks!
More info here: Info from Tesla - 277v feed to Wall Connector (HPWC) - Which Cars Support It
Be sure you set your wall connector dip switch to line-to-neutral instead of line-to-line if you're connecting it to 277 volts.
You should be able to get an extra ~2 kW charge rate if you hook it up to your high voltage panel.