... I'm sure this is a FAQ but I didn't know where to look so here goes. Often, when I plug my UMC into my NEMA 14-50 at home, I notice on the 17" screen that the car seems to be sipping tiny bits of electricity for a few minutes from the plug. Understand, I have my car programmed to charge after midnight to take advantage of the super off-peak electricity rates. This little 0V then 1V then 0V then 1V flickering thing happens for a few minutes, when I park the car in the garage for the night, often 5-6 hours before the car starts charging proper. Sure, it's a negligible amount of power, but I was curious what is the Model S doing? Is it querying the quality of the power? Testing something? Anyways, after a few minutes the 1V settles down to 0V and stays at 0V. Another reason I ask about this is because I am starting to notice on my monthly electricity bill, small amounts of the bill are going to off-peak or peak rates, even though I am obsessively careful to NEVER let the car charge during those times. So how is electricity leaking into the car if I've told the car not to charge? Am I seeing the accumulation of lots of millivolts or 1V over a month's time, adding up to say $3-5 of my $50 monthly bill?