This is not a question I actually expect to get any responses to, but I figure it doesn't hurt to ask since I expect it to take a while to pin down and another data point would be nice. Symptom: While charging at 240V/30A, the AC/DC converter in the car makes what sounds like a rattling noise. It is pretty clearly audible near the rear wheel well, and is not the same sound or source as the cooling pump, fans, or fluid flow noises that the battery thermal system makes. Anybody heard this? It would not be normal behavior, and you would probably know if it was the same thing, because... ...anything with a susceptible power supply in the entire house makes the same rattling noise. LED lightbulbs, UPSes, and breakers, even those separated by a subpanel, several breakers, and over 100' of wiring from each other. It must be some kind of harmonics being injected (I haven't yet managed to get a scope on it while it's doing it to see if it's visible in the waveform), but I don't yet know of what sort or from what. It's a pain to diagnose because it has only happened twice in as many months, I changed three things at once (new car, new level 2 charger, new subpanel) so I can't pin down the source, and the actual issue is so strange that several seasoned professionals I've asked are completely stumped. One of the possible sources in the car itself (but it could also just be another power supply suffering from whatever weird harmonics is causing the rattling noise) so I figured I might as well ask just in case somebody else has had something similar. I can say that since the car charging at 30A is definitively the only thing that causes it it's either the car, the charger, or the breaker. Anyway, just throwing that out there.