July 2019 P3D- at 4,685 miles in Montana, using almost exclusively 120v charging. But it's not really winter yet, is it? So far down to 0 degrees Fahrenheit no real worries. We will see what happens at -25. For that, I have little confidence, but.......we will see. For those 4,685 miles, my average efficiency has been 309 Wh/mi. Meaning I'm not trying very hard to conserve energy. A quarter of that driving has been below freezing. Most of that has also been on an interstate at 85 mph. A very inefficient speed. Correction, 80 mph, the speed limit. I would never speed, of course. I am not a lead foot but I also don't mind punching it at times. All in all, I'm not being careful with my driving efficiency. Highway driving at 85 (80) mph and 10 degrees F will bump the Wh/mi to the 400+ range.
Here in Billings, we have a supercharger that I have yet to use. We use a 15 amp 120v circuit in the connected garage at home because this is a rental house. But I don't drive every day. I work 10-13 days a month, 150 miles away. I stay out of town 3+ days at a time. At work, I charge also with a 15 amp 120 v circuit in the apartment's open carport or a 20 amp 110 v plug in an uncovered space at the hospital. At home, so far, down to 0 degrees, the 15 amp charging inside the garage is unaffected by the temperature. Meaning I get 4-5 mph consistently. The garage is generally 40+ degrees. At work, left outside, the usual 4-5 mph at 15 amp or the 6 mph at 20 amp slows somewhat but stays well above half the warmer charging. Last week with temps from a high of 25 and low of 0 it took 3 days to charge 250 miles where this usually takes 2.5 days or so. If I generally get 100+ miles a day or so I was instead getting 70-80+ miles, depending on wind, average temperatures, snow when outside, and blah blah blah. Weather in Montana changes quickly and constantly. The supercharger in the town where I work is under construction but I have little confidence it will be completed before true winter. Once completed all is well. By the way, I'm also from North Carolina. It can get rather cold in Charlotte as well, just not quite as extreme as Montana. And not the same snow, although the snow is not bad in southeastern Montana, too dry. It's not like upstate New York.
As far as long term effects of rapid versus slow charging we have no definitive evidence of one being superior. Speculation is that slow might be better and very rapid worse. That's all it is, speculation. My car also sleeps quietly while charging and only neutralizes/stops actively charging when I ask it to warm the vehicle. Otherwise, it keeps right on charging, at least so far down to the 0 degrees in my ongoing trails. My P3D- stated range, out of the box, was 310 miles, at 5k miles my 100% charge reports 304 to 312 miles, up and down, up and down. There are a lot of tricks about that number. Meaning it ain't real. That reported number depends as much on the specifics of how I charge and when I read the number as any real battery issue. Meaning, for example, if I charge to some percentage, when it reaches that percentage it will most often be at a proper number as expected. If it sits at that charge while plugged in, the number will bounce around as it discharges and recharges to the set level. Still thinking it's charged to the specified percentage. So it reaches 310 at 100% charge, then discharges to where it reads 306, but not enough to make it start charging again to top it off, it still reports 100% charge. It gets confused. Setting battery percentage for charge is also not a precise thing. There are other circumstances where the range at percentage gets confused but bounces back the next charge. My Statsapp reported battery health shows an upsloping line. But that ain't definitive truth either, just another glimpse of reality.
