90D Range slowly declining

[LargeHamCollider]

I suspect that the voltage level which was mapped to 90% has changed, when 90's first started getting delivered sa 90D owner reported 265 miles on a 90% charge, 265/.9 = 294miles. But no one ever reported 290 or more at 100%, the highest I saw was 288

I'm guessing that previously when the car said "90%" it was really at 92-93%, since this is now fixed, a 90% charge shows a lower value. This could be verified to a degree by asking the owners of brand new 90s what their 90% is.

 

[msnow]

I suspect that the voltage level which was mapped to 90% has changed, when 90's first started getting delivered some 90D owners reported 263 miles on a 90% charge, 263/.9 = 292miles. But no one ever reported 290 or more at 100%, the highest I saw was 286.

I'm guessing that previously when the car said "90%" it was really at 92-93%, since this is now fixed, a 90% charge shows a lower value. This could be verified to a degree by asking the owners of brand new 90s what their 90% is.

When my car was brand new (4 weeks ago) my 90% was 257. Today it's 252/253 consistently.

 

[LargeHamCollider]

When my car was brand new (4 weeks ago) my 90% was 257. Today it's 252/253 consistently.

If you charged to 100% previously and can do so again the result could falsify my theory. Or support it.

 

[msnow]

Yes, I have charged to 100% a couple of times and the OP more than that but it hasn't reversed the trend. Hopefully it has leveled off.

 

[LargeHamCollider]

Yes, I have charged to 100% a couple of times and the OP more than that but it hasn't reversed the trend. Hopefully it has leveled off.

I'm not saying you should charge to 100% to balance the battery, I'm saying the real measure of capacity is rated range at 100% charge not at 90% charge. If your 100% charge has seen little change but your 90% charge *has* seen significant change then you're not losing range the BMS is just calling a different (lower) voltage level "90%".

- - - Updated - - -

Mine started out with 251 at 90% and now is about 250. I drive aggressively
90D as well.

When was you're car delivered?

 

[msnow]

I'm not saying you should charge to 100% to balance the battery, I'm saying the real measure of capacity is rated range at 100% charge not at 90% charge. If your 100% charge has seen little change but your 90% charge *has* seen significant change then you're not losing range the BMS is just calling a different (lower) voltage level "90%".

- - - Updated - - -



When was you're car delivered?

Ok I understand now. I'll try it tomorrow and see. I'm looking for 283 at 100%.

 

[olson.sc]

I have a 90D, delivered Sept 2015. Charged to 90%, my ideal range is 317 mi, rated is 256. Currently have about 1200 miles on it, ave 349Wh/mi.

 

[msnow]

Ok I understand now. I'll try it tomorrow and see. I'm looking for 283 at 100%.

Okay, just did a 100% charge as suggested. Rated was 287 @100% on second day after delivery (27 miles on car 9/15/2015) 257 @90%. Today with 1015 miles on car 100% is 281 and 253 @ 90%. Seems to me that's unusual degradation for a 1 month old car, agree?

 

[apacheguy]

Okay, just did a 100% charge as suggested. Rated was 287 @100% on second day after delivery (27 miles on car 9/15/2015) 257 @90%. Today with 1015 miles on car 100% is 281 and 253 @ 90%. Seems to me that's unusual degradation for a 1 month old car, agree?

Yeah. Perhaps Tesla hasn't gotten around to optimizing the BMS for the 90 kWh or the 90s do indeed have a higher initial loss rate.

 

[luca]

Okay, just did a 100% charge as suggested. Rated was 287 @100% on second day after delivery (27 miles on car 9/15/2015) 257 @90%. Today with 1015 miles on car 100% is 281 and 253 @ 90%. Seems to me that's unusual degradation for a 1 month old car, agree?

what is idea number

 

[LargeHamCollider]

Okay, just did a 100% charge as suggested. Rated was 287 @100% on second day after delivery (27 miles on car 9/15/2015) 257 @90%. Today with 1015 miles on car 100% is 281 and 253 @ 90%. Seems to me that's unusual degradation for a 1 month old car, agree?

Welp, there goes that theory, I agree that that is unusually fast degradation and suspect tesla hasn't fully worked out the 90kwh battery yet.

 

[BertL]

FWIW. My S90D is not quite a month old. On day of delivery (10/5) I charged up to 90% when I got home and of course was running v6.2, with 256 rated range. This morning at 90% and now running v7.0, I was still at 256. I'll admit a couple days in there, the Tesla App reported only 255, but I discounted it as a rounding issue. I have not charged once yet to 100%.

I have a reminder set to record 90% SOC on the 1st of each month in a spreadsheet I created a couple of weeks ago, so will keep an eye on it, but doubt we should begin speculating (especially with the nuts that like to quote out of context in external sources) that there may be some sort of pervasive issue with 90kWh batteries with what we know. I can't explain msnow's apparent degradation, and hope it does not get worse -- I'd frankly be a bit concerned as well.

 

[TheTank]

Interesting enough, I have a P90DL which I received on Sept 8. My 90% is now 366km or 229 miles. I have about 7500km or 4700 miles on the car. My 2013 S85 with over 97000km or 60000miles had a higher range at 90%. I asked Tesla to look as a new P90DL should get better batter than my S85. I did charge full once about a month ago and it made a bit of difference for a couple of days, then the degradation continued.

 

[luca]

Interesting enough, I have a P90DL which I received on Sept 8. My 90% is now 366km or 229 miles. I have about 7500km or 4700 miles on the car. My 2013 S85 with over 97000km or 60000miles had a higher range at 90%. I asked Tesla to look as a new P90DL should get better batter than my S85. I did charge full once about a month ago and it made a bit of difference for a couple of days, then the degradation continued.

did tesla reply u?

 

[msnow]

FWIW. My S90D is not quite a month old. On day of delivery (10/5) I charged up to 90% when I got home and of course was running v6.2, with 256 rated range. This morning at 90% and now running v7.0, I was still at 256. I'll admit a couple days in there, the Tesla App reported only 255, but I discounted it as a rounding issue. I have not charged once yet to 100%.

I have a reminder set to record 90% SOC on the 1st of each month in a spreadsheet I created a couple of weeks ago, so will keep an eye on it, but doubt we should begin speculating (especially with the nuts that like to quote out of context in external sources) that there may be some sort of pervasive issue with 90kWh batteries with what we know. I can't explain msnow's apparent degradation, and hope it does not get worse -- I'd frankly be a bit concerned as well.

Hey Bert-

I guess my car is about 3 weeks older than yours and although I had maybe a mile more than yours to begin with it's been very slowly declining and my numbers matched yours . For example 3 weeks ago I was at 256 @ 90% and 2 weeks ago 255 and so on until now @253 the last couple of days...about a mile a week. Hoping it settles but either way I'll keep an eye on it.

FWIW I have a 90% 40 AMP scheduled charge every day at midnight.

 

[BertL]

Hey Bert-

I guess my car is about 3 weeks older than yours and although I had maybe a mile more than yours to begin with it's been very slowly declining and my numbers matched yours . For example 3 weeks ago I was at 256 @ 90% and 2 weeks ago 255 and so on until now @253 the last couple of days...about a mile a week. Hoping it settles but either way I'll keep an eye on it.

FWIW I have a 90% 40 AMP scheduled charge every day at midnight.

Thanks and good luck with your MS. I'll keep an eye on mine as well. My MS is set to charge every night at 12:05AM with my 100-amp HPWC. e.g. last night, it didn't charge as I suspected it wouldn't, since I didn't drive my MS any yesterday -- it's programming seems pretty smart in that regard. My rated range is down to 249 this morning as I was cleaning the inside yesterday with the music blaring and aircon blowing, but should pop back up tonight after it's charge since I'm taking it out in a couple of hours for a little jaunt.

Take care.

 

[CleanPower]

I received my S90D September 15th. At first with a 90% charge my range was 258 miles.
Since then my range has slowly crept down to where tonight I hit a new low of 251.

I received my S90D on September 23rd. My first 90% charge was 261 miles.
Since then my 90% range has also been declining. Today I hit a new low of 254 miles.

I did a 100% charge about a week ago and got 277 miles.
I had expected 90D would get about 286 rated miles based on reports that 85Ds were getting 270 rated miles at 100% when I ordered the car.

 

[DenmarkP85]

rated ore ideal?

 

[msnow]

I received my S90D on September 23rd. My first 90% charge was 261 miles.
Since then my 90% range has also been declining. Today I hit a new low of 254 miles.

I did a 100% charge about a week ago and got 277 miles.
I had expected 90D would get about 286 rated miles based on reports that 85Ds were getting 270 rated miles at 100% when I ordered the car.

I was at 254 about a week ago, today a new low of 251. I'm getting concerned that it's not leveling off. I'll call Tesla this week to find out what's going on.

 

[Jool]

90% only got me to 249 rated miles this morning :frown: