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roblab
Active Member
mknox
Well-Known Member
There are a number of threads discussing this, some even with graphs showing data on cars of all ages and mileage. Plug In America has done some surveying and has some good data here. I think that most see a relatively big drop in the first year, then the degradation curve levels off. I've seen about 9% after 2.5 years / 60,000 miles, but most of that occurred near the end of the first year.
85S, 13 months with 15K miles. Always charged @ 90% and 100% only 3 times
0-2 months = 240 miles
3-8 months = 237 miles
9-12 months = 235 miles
@ 13th month looking at 232 miles
As mknox alluded to, I wouldn't worry about it. I wouldn't be surprised if you are above 230 after another year.
Jool
Member
90D delivered in late August with about 3,900 miles on it. Full charge this morning only went to 276 miles :frown:
Hoping that this weekend's road trip will balance out my miles.
Hoping that this weekend's road trip will balance out my miles.
Has any brave soul kept their car charged to 100% for several days? A post in a thread regarding battery degradation at TM Forums over a year ago, or it could have been here, indicated that their local service center suggested keeping the car charged to 100% for a week in order to work its magic balancing trick. I'm curious if anyone has done that, either intentionally or by accident, and what impact, if any, it had on your range estimate?
Sogorman
Member
I have only let mine balance to 100% twice and then drove it within 30 minutes. On a side note I picked up a P85 loaner (vin P05xxx) from the Service Center and it was charged to 100% (no idea how long) and it had a rated range of 268 miles! Don't know if it's a referb pack or not but I wish mine had that capacity.
Yes, I asked service about why their older loaners still show 265 miles or more at 100%. The answer was that there is a super secret way to "reset" the range estimate and force the system to recalibrate. When I asked if they could do that to my car, he said no. The car at the Tesla Gallery is always kept constantly charged to 100% day in and day out, and it also shows full range with no degradation.
Sogorman
Member
Candleflame
Active Member
the more I think about it, the less I think it has anything to do with balancing. It's all about voltage mapping and how the charge curve is non-linear, thus making extrapolation from lower SOC more difficult. By keeping your pack at > 90% for longer periods you are simply training the range estimate to better recognize this non-linearity and more closely match the true SOC. This is evident when you charge to 100% and the car reaches "100%", but the cell voltages are still substantially lower than 4.2 V and the car continues to charge at 40 amps. Thus, the car anticipated 100% prematurely.
JenniferQ
Active Member
50 miles on the odo and shows 246 at 90%. No idea what to make of this at this point and I am accelerating quite a bit at the moment when I can since that's the fun part!
Congrats on your new car!
246 is what I had at 90% as well. You should see ~273 at 100%
JenniferQ
Active Member
Great to hear! Planning a few trips later in the year and trying to see where I can get to safely. Thanks for the info. So weird, still, to pass gas stations and think, "Meh."
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