I am using the excellent "Visible Tesla" app to manage/monitor my car from my desktop, and notice something interesting yesterday: It's been cold here recently, so I opted to start warming the cabin via HVAC before a trip. At the same time I decided to try and get the pack up to temp as well (to avoid regen limiting), so I bumped the charge slider up a bit, and started the car charging. So my surprise, the Battery Current dropped in to the negative, about -3.6A or so. Normally my battery current is about 21A and my charger power is 9KW (both about correct for my 240V/40A setup). In this case that implies I was using all 9KW of my charger power, as well as an additional 1.4KW of battery current on order to run to just the HVAC & whatever battery heaters that car may have enabled. I've seen my car pull about 3-6KW before, but never that much, especially as it wasn't the coldest temps the car has been in (probably high 30's/low 40's in my garage). As a matter of fact, I've heard that 6KW is the max the car will pull when heating (although I'm unclear if that's battery heater alone) In any case, it seemed rather high, so I toggled the HVAC off, then back on, and sure enough my battery current jumped back up to about 15-16 amps, with is what I expected. Weird car behavior... not sure what happened there.