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Might have been a headwind that increased the energy usage. I check surface wind forecasts on aviationweather.com when planning my road trips. This way there fewer surprises.
FredTMC
Model S VIN #4925
yep, I get exactly the same Rated Range as you. 176mi at 90% and 198mi at 100%. I just turned 40k mi on ODO.
glhs272
Unnamed plug faced villian
Well considering I was at 183 at 90% and 203 at 100% when new then it is about 3% loss over the time and miles. If it was a static number then I would expect around 171 at 90% and 193 at 100% in the next 18 months. But it is probably a compound factor so then the numbers would be around 168 at 90% and 190 at 100%. Continuing from there at around 100k miles compounding the numbers may be 160 at 90% and 182 at 100% if there is a linear 4% compound loss over time. That would be an acceptable situation to drive the car for 4 years at 25000 per year and only lose 20 miles of maximum range. I could live with that. If someone wants to check my math it would be appreciated.
Your math is ok but your assumptions are off. If you listen to what roadster owners and early S owners are saying, loss is not linear - much less compound! There's some loss in first year for most, but it slows after that. Read up! If your assumptions were correct, the roadsters would be leafs by now.
mknox
Well-Known Member
Yep. And I'm back up to 218 @ 90% over the last two days. I do seem to have plateaued there. I was seeing 214-215 @ 90% after reverting to 90% charging (from 70% daily) about 3 or 4 weeks ago.
Just guess, that as something degrades or depreciates, it would do so as a factor of the current state (compounding) vs a linear reduction based on the original state. Again, it is just a guess as to how things typically happen in nature. But if at 100,000 miles I have only lost about 15 miles of range, it is not a big deal the car will still have a lot of value to me.
Compound factors are an accelerant for growth and and a restraint on contraction. So, if something declines 10% annually from a starting point of 100 then it's reduced by 10. A 10% decline from there (90) is a reduction 9, etc.
This is assuming a constant percentage of contraction which has been demonstrated to be inaccurate when applied to the battery pack (i.e., past degradation rate does not indicate future degradation rate).
This is assuming a constant percentage of contraction which has been demonstrated to be inaccurate when applied to the battery pack (i.e., past degradation rate does not indicate future degradation rate).
UberEV1
Member
Thought I would try this out as well and am seeing similar results on my S85 with a B pack. Originally charged to 90% as Tesla advised, then backed down to operate in the 60~75% range as well as hold charge level at 60% during my 1 and 2-week business trips. Using this approach, I saw the rated range begin to drop, but didn't do any 100% charges to check max full. After reading the posts here, I went back to 90% charges and saw rated range increase from 225 to 228 today (also over 3 week period). Not very scientific without the max charge and ideal range data as well, but some change observed.
Tacket
Member
S60 - B pack - 37k miles : When charging to low percentage my 90% was 165 rated. Started 90% charges and after about 4 weeks hit 90% at 178 rated this morning. Fun!
Bighorn
Top Supercharger
There's a label on the battery that you can see if you turn the wheel and peer into the passenger side front wheel well. IIRC, it's after the last digit.
Bardlebee
Member
This is a really, really large thread with a HUGE amount of information. Would it not be beneficial to have a Googly Document to record everyone's mileage/current range/last time range charged/how often rang charged/climate/etc???
I think this is a fabulous idea (maybe one that's been brought up before) but I loved that document in the thread about deliveries, really gives you an appreciation of all the aggregate information. Tesla has all our numbers, but it would be nice to take a step back and see everyone's numbers that aren't buried in piles of pages of threads. I can figure out how to start this Doc if you guys like. I would or someone could also add a section to update their current range, going forward.
I think this is a fabulous idea (maybe one that's been brought up before) but I loved that document in the thread about deliveries, really gives you an appreciation of all the aggregate information. Tesla has all our numbers, but it would be nice to take a step back and see everyone's numbers that aren't buried in piles of pages of threads. I can figure out how to start this Doc if you guys like. I would or someone could also add a section to update their current range, going forward.
This exists but never got traction. Requires a curator- someone who harvests the posts here and updates table. Kind of like the lifetime wh/mi thread.
Did you guys see this decrease early on? I have a 6/2014 build, 60kWh, which started at 213 @100% and 191 @90%, but now I am getting consistently 177-179 @90% and 197-199 @100%. I just crossed 8K miles. If I still get this same range 2 years from now when I am at 40,000 miles I will be happy - but I am kind of worried as it has decelerated pretty fast.
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