palmermd
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Re: Official Tesla Model S thread

Wed Aug 22, 2018 6:29 am

Interesting read. I think the post has more to do with Tesla coporate culture than model s but either way thanks for sharing it.
Michael

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cwerdna
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Re: Official Tesla Model S thread

Fri Aug 24, 2018 1:26 pm

Just heard about Thread by @atomicthumbs: "A former Tesla employee, who worked on their IT infrastructure, is posting in a subforum of a subforum, a little-known place for funy comput […]". Seems like the S or X thread would be the most appropriate. Have only read less than a third of it. I wonder if there will be some takedowns or cease and desist.

https://threadreaderapp.com/thread/1032 ... 45376.html

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RegGuheert
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Re: Official Tesla Model S thread

Mon Aug 27, 2018 7:08 pm

60-kWh Tesla Model S battery in Denver dies after five years and 142,000 miles. I'm impressed that Tesla is willing to replace it after under warranty!

That's roughly equivalent to a 24-kWh LEAF battery failing after five years and 57,000 miles in that area. (BTW, I don't see any information about how much that battery had degraded before it failed. Does anyone know?)

That Tesla battery was frequently charged to 100% and discharged to a very low value before being Supercharged again, so I wonder what the most significant factor was and i wonder why the battery failed. My guess is that the 100% charges were the least harmful, but that the deep discharges and heating from Supercharging are the real culprits. One thing I find interesting is that TaylorSFGuy abused his LEAF battery in much the same way and managed to get more miles out of his battery than just about any LEAF battery--over 150,000 miles.

I expect that the reduction in battery resistance that has been achieved in the Model 3 should pay off in much longer battery life.
RegGuheert
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10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
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lorenfb
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 11:16 am

RegGuheert wrote:I expect that the reduction in battery resistance that has been achieved in the Model 3 should pay off in much longer battery life.


Where did you source your data on the M3's battery resistance? The MS's resistance is about the same as the Leaf's, ~ 60-70 mhos @ 25C.
Yes, the 2170 battery is more efficient than the 18650, but haven't seen any comparative numbers.
Leaf SL MY 9/13: 66K miles, 50 Ahrs, 5.2 miles/kWh (average), Hx=70, SOH=78, L2 charges to 100% > 1000, max battery temp < 95F (35C), min discharge point > 20 Ahrs

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RegGuheert
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 3:15 pm

lorenfb wrote:Yes, the 2170 battery is more efficient than the 18650, but haven't seen any comparative numbers.
That's what I am referring to. My understanding is that they chose the 2170 size based on a detailed study which traded off (mainly) capacity and thermal performance. I'm guessing they have tried to minimize the temperature rise from the case to the hottest internal point.

I guess time will tell.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
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Valdemar
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 5:03 pm

RegGuheert wrote:I'm impressed that Tesla is willing to replace it after under warranty!


A PR stunt? 20k additional loss on their balance sheet is nothing. Is there any data how other high-mileage Teslas batteries are doing?
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-0CB(66.14AHr)@87.5k/54mo (BBB), -1CB(53.92Ahr)@140k/29mo,
53.92AHr, SOH 84.5%, 140k miles

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EVDRIVER
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 5:10 pm

Valdemar wrote:
RegGuheert wrote:I'm impressed that Tesla is willing to replace it after under warranty!


A PR stunt? 20k additional loss on their balance sheet is nothing. Is there any data how other high-mileage Teslas batteries are doing?


Doubtful. They have done some work on my S that clearly should not have been under warranty. They are generally pretty good about this type of thing depending on the situation.

lorenfb
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 5:27 pm

RegGuheert wrote:
lorenfb wrote:Yes, the 2170 battery is more efficient than the 18650, but haven't seen any comparative numbers.
That's what I am referring to. My understanding is that they chose the 2170 size based on a detailed study which traded off (mainly) capacity and thermal performance. I'm guessing they have tried to minimize the temperature rise from the case to the hottest internal point.

I guess time will tell.


A little info about the 2170's improvement in battery resistance:

https://insideevs.com/tesla-lithium-ion-batteries

In order to further improve cell efficiency and lower costs Tesla has built a large battery factory in Sparks, NV near Reno called Gigafactory 1 that is now producing a new cell design called the 2170 because it is 21 mm in diameter and 70 mm high to be used initially in Tesla Powerwall home storage products and Powerpack utility storage products as well as the new Model 3 sedan, designed to be smaller and less expensive than the Model S.  The 2170 design is 46% larger in volume than the 18650 and 10-15 % more energy efficient than the 18650 cells, according to J. B. Straubel, CTO  of Tesla.


https://www.tongfamily.com/2018/05/tesl ... 0-vs-2170/

The Model 3 uses a different battery, handily this isn’t standard but is 21mm x 70mm so larger and they are about 10-15% more efficient and 46% bigger. This means that for the same volume, if the Model X and S were to switch to the 2170 battery, they but delivers double the current at 6A vs 3A in the 18650.


And here; https://www.youtube.com/watch?v=mNk5l_3vGR8
Leaf SL MY 9/13: 66K miles, 50 Ahrs, 5.2 miles/kWh (average), Hx=70, SOH=78, L2 charges to 100% > 1000, max battery temp < 95F (35C), min discharge point > 20 Ahrs

cwerdna
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 5:37 pm

Two women Tesla drivers try to ram each other
The black Tesla nearly runs over the other woman, who then gets in her blue Tesla and rams the black one with a crunch.
https://www.liveleak.com/view?t=Cn4Nc_1535331831

They're speaking Mandarin but my Mandarin's poor and the audio isn't great. The ramming is at the end.

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GRA
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Re: Official Tesla Model S thread

Tue Aug 28, 2018 5:57 pm

cwerdna wrote:Two women Tesla drivers try to ram each other
The black Tesla nearly runs over the other woman, who then gets in her blue Tesla and rams the black one with a crunch.
https://www.liveleak.com/view?t=Cn4Nc_1535331831

They're speaking Mandarin but my Mandarin's poor and the audio isn't great. The ramming is at the end.

Perhaps they've been watching too many Tesla vs. whatever drag race videos - is testosterone contagious? Meanwhile, via IEVS:

Watch Tesla Model S Seats Evolve Over Time
https://insideevs.com/tesla-model-s-seats-evolution/
There's a video. 4 generations.
Last edited by GRA on Tue Aug 28, 2018 6:24 pm, edited 1 time in total.
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