EV Charging Expansion and Voltage Limitations

[yuhong]

How would that even work? There's 277v HPWC out there. What would happen if a 3 connected to one? It's not like the owner would know it's 277v....

They would just refuse to charge. Remember that with J1772 the actual charger is in the car.

 

[nwdiver]

They would just refuse to charge. Remember that with J1772 the actual charger is in the car.

The car would still be exposed to 277v... since the connector doesn't know if it's S, X or 3; I suspect it would work... be interesting to hear back from a 3 owner one way or the other...

NVMD.... that sucks.... there ARE HPWCs out there that are useless to a 3

 

[Fiver]

How would that even work? There's 277v HPWC out there. What would happen if a 3 connected to one? It's not like the owner would know it's 277v....

Model 3 does not work with 277v HPWC. It's probably the primary reason Tesla stopped officially supporting 277v installs even though they still work fine for S & X.

Well, for S & X they work fine as long as there isn't a voltage spike, the internal chargers on S & X will fault out if they go above 283v, and apparently require a service visit to reset them. Not much wiggle room from 277v to pop over 283v. Lots of headroom for 240v installs though.

 

[Sophias_dad]

I charge my 3 at 269/270 at work all the time...(well, since I got it last Tuesday, anyway!)

 

[nwdiver]

I charge my 3 at 269/270 at work all the time...(well, since I got it last Tuesday, anyway!)

Hmmm.... the plot thickens....

 

[Fiver]

I charge my 3 at 269/270 at work all the time...(well, since I got it last Tuesday, anyway!)

Is this technically a 240v circuit that's way over it's spec or is it a HPWC specifically wired to a 277v circuit (that's appears to be under spec)

 

[Sophias_dad]

Is this technically a 240v circuit that's way over it's spec or is it a HPWC specifically wired to a 277v circuit (that's appears to be under spec)

Replied to the other thread... its a 277 volt circuit that I assume has some normal wiring losses as it gets to the parking lot and through the 24 foot HPWC wire.

 

[Fiver]

Replied to the other thread... its a 277 volt circuit that I assume has some normal wiring losses as it gets to the parking lot and through the 24 foot HPWC wire.

Well in that case this is very interesting. It came from Tesla that the Model 3 did not support 277v charging, but clearly yours does, so perhaps something has recently changed with the internal charger? When was your 3 built?

The plot thickens!

/edit. Continuing discussion on this over in this thread.

 

[arg]

Well in that case this is very interesting. It came from Tesla that the Model 3 did not support 277v charging, but clearly yours does, so perhaps something has recently changed with the internal charger? When was your 3 built?

The plot thickens!

I thought it was fairly clear from the info collected in the various threads - the Model 3 has a maximum operating voltage that's somewhere in the middle of the range of voltages to be expected on a standard 277V circuit. Hence if you get lucky it will charge, but as it doesn't work across the whole of the standard range Tesla has to say it's not supported.

 

[eprosenx]

I contacted Tesla charging support and got some good up to date information directly from them. I have posted it in a new thread here (since it covers all the model of Tesla vehicles):

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

Some great info! Sounds like they changed the software on the Model 3 to allow it to support 277v.