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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

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

Rocky_H

Well-Known Member
Feb 19, 2015
8,804
11,492
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.
 

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