Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.

Pros and Cons of 800 V Charging

Does it?
Luckily our Teslas aren't aware of your statement. Otherwise Level 2 Tesla charging would be a luxury available to single family dwellers only.
  • The US grid runs 120/208V three-phase and 277/480V three-phase. This is why the Tesla onboard chargers are rated for 277V.
  • Residential single family typically has 120V single-phase, split into two 120V lines 180 degrees out of phase with each other, giving 240V between them.
  • Residential multi family housing is typically 120/208V three-phase and commercial properties have a choice of 120/208 three-phase and 277/480 three-phase.
  • Level two charging outside of private residences utilizes 208V two-phase charging without neutral, meaning that a Tesla onboard charger sees the difference between when two phases, which is the green curve shown in this diagram:
View attachment 867377

1) Teslas only support 1 phase charging in the USA
2) The USA grid supplies power at 240V.


Well-Known Member
Feb 19, 2015
Boise, ID
Jeez. You are both correct--just talking around each other. Yes, there are areas of the U.S. grid that transmit electricity in 3 phase forms, but the U.S. Tesla cars only have two pins used for voltage, so they can't take three hot conductors as input to use the 3 phase directly, so they are only getting one voltage difference to use as a "phase". Whether it's the 120V (half of split phase) or the 240V (full split phase) or 208V (one phase off of a 3 phase system) isn't the point.

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.