I haven't had time to gather more data points, but here's a drive I did to get a ballpark estimate of what could be done if I needed to watch my Wh/mi. 208mi using ~80% charge
P90D Range Data
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I haven't had time to gather more data points, but here's a drive I did to get a ballpark estimate of what could be done if I needed to watch my Wh/mi. 208mi using ~80% charge
P90D Range Data
gg_got_a_tesla
Model S: VIN 65513, Model 3: VIN 1913
I think you're right. For a couple of weeks, I charged only to 70%. After those two weeks, charging to 90% resulted in a loss of 5 miles of range. Charging to 100% showed the same 5 mile loss (253 down to 248). On a whim I decided to charge to 100% three days in a row when I had errands to run. First day it charged to 248 miles. Second day it went to 250 miles. Third day I'm back to 253. In this example, I did not need to drive the car down to single digits to recalibrate, it did so all by itself simply by charging to 100% a few times in a row regardless of how many miles I actually drove.
I'll go one step further and mention my overall "strategic" plan. Based on the odd 100% charge, if memory serves my 21-month-old S85 shows about 250-255 miles, so about 4-5% degradation. If I assume the absolute worst, like, after 15 years a 20% degradation, that still gives me 210+ miles of range (though, Roadster experience after 8 years I believe nearly all of them are still at or above 90% -- haven't checked the threads lately). Couple that with the increased supercharger routing over the same time (can anyone say "Trans-Canada"?????), it should meet my range requirements very nicely even on long trips. So I no longer obsess about the numbers (especially since, all we can trust is that calibrated-or-not range estimate -- high precision low accuracy).
I post this for those who don't really want to worry about the battery life. And, if 210+ miles isn't enough, I (will) have the option to purchase a new battery for about the same as a motor-and-transmission job in an ICE (using my special ballpark estimation analysis). So for me it's a wash. Well, except for the FAR MORE ENJOYMENT I get driving the S than I would any ICE.
To clarify, you have to let it sit until it says charge is complete. Even when it hits 100% it will continue to charge very slowly for a while (30min+ sometimes)
Sogorman
Member
I had charged to between 70% and 80% for about the first 11,000 miles and was seeing about a 6% rated range degradation. For the last couple of weeks I started charging to 90% and have seen the rated range go from 228 to 332 which now represents a 2.4% rated range degradation. It does appear that the BMS looses track of the rated range the further you keep it from 90% despite the fact that the battery will probably last longer in the long run. I'm going to back my charging back down to 85% (I only use about 50 rated miles a day) and will give it another 10,000 miles.
CleanPower
Member
My new 90D - 90% charge varies between 257 and 261 miles. This morning it is at 258 miles. Range mode is off. I have never turned it on.
I am right there with you. I am at 172, I have been as low as 168 @ 90%. I lost a few miles in chunks after driving from 90% down to 15-20% or so on a couple of day trips. It consistently works its way back up to 172/173..but 100% is only 191 - 194
I have tried all the tricks to regain miles but this has not worked.When new it was 191 at 90%, I have about 32,000 miles on my car.
mknox
Well-Known Member
My big drop came after a summer of charging to 70% and ending the day around 30%. I noticed it when I had to charge up to 90 or 100 for a trip. Those miles seem to have been lost to me forever. No amount of deep discharge / fully charging or any of the other "tricks" mentioned here did anything more than a mile or two for me. I have heard that these batteries will show degradation more quickly at the beginning, then it will taper off quite a bit. I've been at around 220 @ 90% (245 @ 100%) for about a year now.
Yup, same boat as you. I charged to a lower % for a while since I never needed the full range during regular driving. Then when I needed 90% it wouldn't hit the same number. Nothing has changed with repeated 90% and occasional 100% charges, I remain at 219-221 for 90% charges.
Try charging to 100% 3-5 times in a row, I think you'll see your estimate rise.
Sogorman
Member
This thread has scared me into setting my S85 at 90% and not worrying about it. It seems like people that set it and forget it have the least amount of degradation then those who like me try and baby the batteries. I'm going to go with a 2:00am charge at 36A (dropped the amperage on my UMC so it does not melt) to 90% and not worry about it anymore.
This is unnerving to me as I'm seeing range loss while following similar charging habits, but it was my understanding that the range would be restored after repeated 90% charges. It wasn't reassuring to me that I didn't regain miles after my road trip this past weekend which included a couple 100% charges.
Who wants to be the guinea pig here? I have an idea to restore your range:
1. Access fuse box in frunk.
2. Pull yellow touchscreen fuse.
3. Pull BMS green fuse.
4. Wait 5-10 min.
5. Insert fuses in reverse order.
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