It’s a new one so I didn’t suspect the blades. But I’ll double check it or simply polish them by sandpaper.
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Wall charger V3 shows lower voltage.
- Thread starter SLWORD
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josahua
Member
There was a bad set of relays back in the day. I got nothing else for now. Get it under a load and watch the temp and amps.
exxxviii
Member
It’s a 3.7% variance between 2 voltmeters. If typical accuracy of a good voltmeter is 1%, then you are not too far off. I would try another voltmeter. Then you have 3 independent readings and talk take a majority vote for truth. Most likely, if the TWC is the minority vote, it is merely inaccuracy in its internal voltmeter.
You could also put conductive grease on the terminals and blades.
You could also put conductive grease on the terminals and blades.
Since it's not under load, it's not a connection issue (unless is was really bad).
It may be a difference in measurement technique, is the multimeter a true RMS type? As compared to a peak detect times 0.707. Not sure how the EVSE measures, but if waveform is not quite sinusoidal, that could result in different readings.
Will be interesting to compare what the car reports.
Tech5150
Member
Mine is doing the same thing (that's how I found this thread). 246 volts at breaker and Wall connector contacts using Fluke meter. 236 volts reported by wall connector UI. Car shows 243 volts while charging. Seems like a software issue in the Wall Connector maybe. I am 1 firmware update behind the latest version according to iOS Wall Monitor app. Seems to work ok...
60amp breaker, 4AWG wire, 25' run, Gen 3 Wall Connector.
60amp breaker, 4AWG wire, 25' run, Gen 3 Wall Connector.
dhrivnak
Active Member
Right place to measure. While low it is likely in spec make sure all connections are tight.
I wouldn’t recommend sanding the blades. I think it is most likely just a difference in the quality of resistors being used to measure the voltage.
josahua
Member
What voltage shows when you dial charge rate down to 10 Amps in the App?
If your charger is attached to a breaker panel with 3-phase power, then normal voltage is 205v. 3-phase power is used for large-draw installations such as hotels, shopping malls and factories.
My experience is the Tesla will automatically reduce charge Amps if there is a significant voltage drop. This safety measure helps avoid overloading a circuit.
If 200 Volts is a significant drop from the 10 Amp Voltage then there is likely a serious problem. Charge at 10 Amps until you can get a good electrician to review your charger connection.
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