Charging Model 3 via HPWC - "Voltage Too High"

[eprosenx]

Here is my highest voltage

287v ! And that was on a Tesla mobile charger. Didn't know I would catch this thing at a friend's house. (Most certainly a problem with the Utility)

Where was this? Canada? Standard 120/240 residential service?

That is seriously bad. Like call the utility and get them out there right now bad. That is likely an issue impacting the entire neighborhood (like a failed online tap changer at the substation or a voltage regulator bank somewhere)

 

[eprosenx]

Here is my highest voltage

287v ! And that was on a Tesla mobile charger. Didn't know I would catch this thing at a friend's house. (Most certainly a problem with the Utility)

Btw, and why were you at only 24 amps? Did you crank that down, or did the car do it?

Assuming 120/240 split phase service and that the transformer windings are not messed up on your friends service transformer, then they may be seeing 143.5 volts on wall outlets that should be 120v nominal. That is extremely bad. Some things could be damaged or dangerous.

(also, nice and fast charging on the plus side!)

 

[nwdiver]

Btw, and why were you at only 24 amps? Did you crank that down, or did the car do it?

Assuming 120/240 split phase service and that the transformer windings are not messed up on your friends service transformer, then they may be seeing 143.5 volts on wall outlets that should be 120v nominal. That is extremely bad. Some things could be damaged or dangerous.

(also, nice and fast charging on the plus side!)

Pretty sure that's 277v service. 287v is fine.

 

[eprosenx]

Pretty sure that's 277v service. 287v is fine.

Yes, if 277v service that is fine, but extremely unlikely to find 277v at a residence. Also, he said he was using the UMC. I don’t think you should ever be putting 277v on like a 14-50 or even a 6-50.

 

[fcharland]

Friends home, so 120/240. Pool pump broke down (melted) on the next day.

7kw maximum due to mobile connector limitation I guess.

 

[nwdiver]

Friends home, so 120/240. Pool pump broke down (melted) on the next day.

7kw maximum due to mobile connector limitation I guess.

Wow; I've never heard of voltage being that far out of whack. Any word what caused it? If it was the feeder line that could have effected dozens of homes.

 

[eprosenx]

Friends home, so 120/240. Pool pump broke down (melted) on the next day.

7kw maximum due to mobile connector limitation I guess.

Make sure to bill the power company for that one! That is a screw up on their part!

Glad nothing caught fire.

Did they give a “reason for outage”?

 

[fcharland]

They said no problem on their side. Everything was normal again on the next day