The breakers are Eaton, and the ones tripping are actually combination AFCI/GFCI. I don't have any arc fault only breakers in the panels. Changing to a 40 amp breaker and running 8 AWG wire for L1 and L2 and 10 AWG wire for ground didn't make any difference. The AFCI/GFCI breakers didn't trip in the first few minutes of charging, but were tripped by this morning. I talked with an electrician and with an electrical engineer (I am only a mechanical engineer), and they both recommended eliminating the AFCI's. I can watch the voltage with a multimeter, but I am guessing that you are talking about a more complex tool.
The lights on some of the AFCI/GFCI's blink 5 times and others blink 6 when I restore power to them.
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Wow, this is an exceedingly weird condition.
Also odd that some of your breakers are GFCI tripping and others say they are failing a self test.
Eaton Breaker Flashing Red - The Geek Pub
We do know that Tesla’s can sometimes trip GFCI’s on the circuit feeding them, but never have I heard of it tripping *other* circuits! My understanding is that sometimes interference/noise on a circuit can trip the GFCI function inappropriately, but again, generally on the protected circuit.
All I can think of is that you have a loose connection on one of your hot wires or neutral somewhere between your panel and the transformer, but since the Wall Connector and UMC don’t use the neutral, it seems like the hot lines would be the only ones that could have an issue. I would check the torque on all the connections I had access to.
Note that those breakers may be an older style at this point. I wonder if newer revs of the same breakers would not exhibit the issue?
It is odd to see so many gfci afci combo breakers. Normally circuits need afci protection or GFCI, but not both. Perhaps a more traditional setup of just afci breakers plus gfci receptacles where necessary may not exhibit the issue?
And finally, it is possible your car is defective and generating a ton of noise or harmonics or something on the line that is causing this. Very odd since we have never seen the issue before.
I might email Tesla Charging Installation Support and ask them what they think. They are generally decently responsive. (email address is in the wall connector manual)
Please report back what you find out!
P.S. Using a multi meter to test is a good idea while the charge current ramps up. Also, what voltages does the car report when you first plug in and then also once it ramps up to full current for a few minutes?