The hearter is a big contributor, but the range loss also occurs in cold weather even if you don't use the heater. With colder temperatures, the BMS raises the maximum allowed depth of discharge (ie. the "zero" SOC point) to prevent excessively low battery voltage under a load.
Sudden unexplained drop in SOC?
I’ve owned my 2014 ED for just over a year now and there have been a handful of times when the state of charge drops 10-20% while the car is parked for a few hours. The first time it happened, I thought I was just imagining it. It happened again today and I’m positive it is real. It was at 40% SOC when I parked at work in the morning. When I got In to go home seven hours later, the SOC had dropped to 30%. Any thoughts on what would cause this to happen? I am still on the original 12V battery.
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