Nothing odd about the run, less than 75ft of 6-something, whatever was recommended. As I said, does it regardless of household load. I was told once that the car was sensing 480v on the line and that's why it dropped to 30, but if I really had 480v surges in the house, id know about because every device would explode.
I recall some software updates being better than others, but I keep coming back to the mobile charger and an over zealous utility giving me power at 244v when charging starts. I like the 38amp idea though, thanks.
Not necessarily. It depends on how long the surge lasted.
Yes, if you applied 480V RMS to a 120V/240V appliance, they would blow up.
However, the "240V" you have in your home is actually an RMS measurement over time. If you were to take an oscilloscope measurement of one cycle of AC 240V, you'd see that the sine wave peaks at about 340V or so (sqrt(2) * 240) with no load. In addition, reactive loads will change instantaneous voltage as well.
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For what it's worth, my transformer is set to provide 248V to my home, and the current does not back off.
Please read the FAQ, it describes all the different contributing factors. In many neighborhoods, transformers are shared and it can be a neighbor's appliance that causes problems.
I run several rack-mount servers and UPS units (48V with AVR). Fortunately or unfortunately, the UPS's aren't flagging anything unusual with regards to spikes/drops in voltage. And I would suspect they are every bit as sensitive as the Model S. But as someone suggested, the dropping by 1-2amp is a great solution. At least then you arent stuck at 30amp without knowing.