Info from Tesla - 277v feed to Wall Connector (HPWC) - Which Cars Support It

[David99]

I believe even the very first Model S chargers supported 277 Volt. After all, they were used in the early V1 superchargers. Of course that was never official back then. I doubt we will see this catch on. Pubic L2 chargers are about 50/50 208 Volt vs 240 Volt. I haven't watched the video, just wondering if a public L2 station has 277 Volt, will it be able to step down to 240 Volt for cars that don't support it? That would require a semi expensive hardware.

...just watched the video. Very well made and informative!

 

[eladts]

There used to be a public 277V HPWC in Nashua, but it seems to be either broken or removed from the latest PlugShare reports. Since it is just an EVSE, it won't do any voltage conversions. Either the car can take the voltage or it can't.

 

[tga]

I believe even the very first Model S chargers supported 277 Volt. After all, they were used in the early V1 superchargers. Of course that was never official back then. I doubt we will see this catch on. Pubic L2 chargers are about 50/50 208 Volt vs 240 Volt. I haven't watched the video, just wondering if a public L2 station has 277 Volt, will it be able to step down to 240 Volt for cars that don't support it? That would require a semi expensive hardware.

Correct. I charged my 2014 w/ dual chargers at an 80A/277V HPWC back in the day:

 

[Seattle]

Correct. I charged my 2014 w/ dual chargers at an 80A/277V HPWC back in the day [...]

It seems that 277V charging is becoming a thing again with SAE J3400. Does anyone tried to charge recent Tesla cars with 277V? Are there 277V destination chargers in the wild?

Learned a lot reading this thread and watching that youtube video. I was reading the comments on the video and finally came to an answer of my question, what happens to pre-existing cars with J1772, when you put a tesla AC nacs adapter on there, but with 277v power coming in from a 480v building power? Old Teslas can handle 277v, newer Teslas probably can (it seemes since j3400 was supported by Tesla new Teslas also can). But the yt comments say existing/older j1772 cars can have problems with 277v:

@EngineeringPerspective 2 months ago​

Great explanation! the MAIN point is cheaper Level 2 installations but as you rightly pointed out, what will happen to existing J1772 vehicles...? For the good of the EV future, they need to start handing out these J3400 Level 2 277V EVSEs like candy. So many commercial building owners are very reluctant to install the Level 2 chargers due to cost.​

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https://www.youtube.com/@EVBuyersGuide​

@EVBuyersGuide 2 months ago​

At the moment it would only benefit Tesla and could physically damage pre J3400 EVs/PHEVs. That would be a big problem. -Travis​

 

[eladts]

existing/older j1772 cars can have problems with 277v

I think this is the reason why there is no official NACS to J1772 adapter for Ford and Rivian vehicles.