minispeed said:
As it`s gotten colder here, -5C, I`ve been looking at my 2015s regen more. I know at -20 it could change a lot but there is still a decent amount available. I can get it to bury the regen needle at low state of charge and at 97%ish I can get it to give 20kW of regen. I really don`t have a place where I can get up to enough speed to try to bury the needle of regen at anything higher than that charge.
This definitely doesn't solve the problem of going down a mountain that has enough energy to get you above 100% charge but it does sound like a big improvement to the older cars.
The real question is what is the battery temperature? Even if the OAT is -5ºC the battery could be considerably warmer, depending on where you park the car overnight and your charging and driving pattern, both of which warm the battery a lot. When I've been driving at -5ºC in recent days my battery has been in the +7 to 8ºC range. That makes a significant difference in regen levels. If my battery was at -5ºC I'd expect little regen, but it almost never gets below 0ºC so I tend to have some regen at low SOC, albeit not nearly as much as I would like.
I expect that the 2015 regen will be considerably better than mine, but it is hard to compare without battery temperature readings.