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Nope no errors! I know I have written a lot and shared deep, but my case does not seem to be covered by Jason Hughes info, nor the FB/Tesla BMS_u018/BMS_u029/BMS_a066 professionals :-( I have not postponed software updates, so the special case, that when users refused the many software updates...

I failed to paste in the 'Regression Date'. Here is a graph of Average Power when Resting for more than 12 hours (including preheating etc.), but it is obvious that before 'Early November 2022', the minimum power was approx half of 50 W and after more than 50 W: These are the data for the jump:

Hmmmm2: My Jump from around 30 W Vampire Drain to +60 W Drain CAN have occurred early November 2022 and I received SW=2022.8.10.6 on November 4 Jason Hughes writes that fancy Blead gymnastics in Module Y can help diagnose Brick 6 in Module Y-1, perhaps my BMS is still diagnosing whether I have...

Hmmmm, re-reading Jason Hughes excellent explanation regarding Condition X (Stuck CMOS) and Condition Z (wrong voltage reading from BMB1.5) I see: A: Condition X should generate BMS_* alert and ask for service B: Condition Z is unlikely in my BMB 2.0 battery So more likely parasitic cells...

Having 'slept on my data', I think the most likely explanation to be a stuck CMOS, that is AlwaysOn on a BMB, causing a constant blead on one brick, that the BMS tries to balance out in vain. This more or less prevents individual balancing. Reasons for theory are: A: A parasitic cell could...

I have been communicating with a Norwegian Tesla Fellow, whom confirms what Jason has stated earlier in this Forum, namely that Balancing Occurs whenever the BMS wants. And that matches my 'latest' data (It may however overcompensate a little, I will investigate!). Current assumption (partly...

I have charged once to 100%, then learned from FB/Tesla BMS_u018/BMS_u029/BMS_a066 Professionals, that balancing happens while charging in the 80% - 100% SoC window. I have then twice charged to 93% with very low Amp setting to allow prolonged Bleading. It may or may not have helped, in...

I asked the least chatty/hallucinating GPT and answer was: You Will FSD concretely work with an old MCU1 Main Computer? Copilot FSD v12 will not work with the MCU1 Main Computer. The MCU1 (Media Control Unit 1) is the older hardware version found in some Tesla Model S and Model X vehicles...

It is slightly an issue for older Model S, which seems to loose up to 1% per day. It is slightly more of an issue on MCU1 -> MCU2 upgraded older Model S, which looses slightly more, apparantly because of changes in LowPower and SleepModes :-( wk057 said: MCU2 was designed with the standby...

Yes, - unfortunately I have to copy+paste from screen shots as I am on the Beta version of SMT in order to read out Min/Max CAC (Calculated Amperagehour Capacity) and the Beta version has 'lost' the existing ExportToCSV functionality. If I could get SMT to my old Windows Phone I could install...

Unfortunately I changed two things when I did my last 80% - 87% SlowFox Charge! A: I only charged 7% (80% - 87%) B: I drove of immediately after reaching 87% My previous two 'balancing attempts' were: A: I charged 13% (80% - 93%) B: I turned on Camp mode and used that to drain a few hours off...

I know I posted a lot of graphs, but if you examine my CAC versus Cell Voltage double graph, you will see that Module 2 Bricks 7 and 12 are so low in Top Voltage (4,14 V) that they will terminate the drive first (Bottom most Voltage graph) EVEN though they both hav a Capacity (CAC) above...

Not according to my 'tests' :-( After my previous post I have charged 78% SoC to 93% SoC with 1 Phase x 5A x 230V = 1.150 kW - Charging Power Consumption of approx 0,180 kW. This theoretically gives 10 hours of balancing each time. My Brick Voltage ImBalance improved as follows: After...

Luckily 50% is below the 'bad' calendar Aging jumps of both NCA, NMC and LFP. And if I park my Tesla at 50% it will be in 30% in less than three weeks :)

Owners with Ludicrous and P models will have a functionality loss at low SoC, namely performance :-( For my car it is only Range Inconvenience. My Low Power Model S 70 D 2015.10 has same acceleration at most SoC's. As seen here, it has same 275 kW - 285 kW and 0-100 kmph in approx 5,2 Secs, at...

I totally agree,! My 72% Max is when doing long trips and when super charging. My daily commute DOD is centered around 40% and planned so that all longer idle periods happens at less than 55% SoC (50% preferred). The very majority of my capacity loss is likely Calendar Aging. You can see it...

Hmmmm, I have read many different stories about how to balance Tesla (A: Charge to above 93%, now Blead Resistor CMOS (switches) will be turned on with timers, to blead off current from Bricks with too high voltage, which will take days. B: It Balances by itself all the time etc. My current...

I came to this thread because I searched wide for 'ScanMyTesla Export to CSV' :-) I think the thread was intersting, and is left with the impression that: A: The PTC Heater is occasionally on in a chopped mode B: The watt hours 'wasted' is normally small C: I personally think it is natural...

I think I know why, my Nominal Capacity is off! Before two longer trips, I have balanced my Bricks by charging slowly for 10 hours in the Balanibg window of 80% -100% SoC. Each balancing only improved ImBalance by approx 2 mV (According to FB/Recell, the blead resistors only blead 100 mA, so it...

According to Jeff Dahn (Li-Ion professor and expert at Dalhousie University, with a team of students and PHDs that are Tesla Consultants) the way to not cause excessive increase in Battery Internal Resistance for NMC is to stay below 4,07V :) (As my Model S 70D has Panasonic NCA cells, I try to...

I can confirm - if you do not have a P or Ludicrous model, which requires higher SoC and elevated temperature, but - say - a standard Model S 70D, then the power delivered seems controlled by software to match the specs for the car at many different SoC. (SMT occasionally reports that my...

That was a good deal :) And assuming they software limited it inth top to the original 77,5 kWh in a Model S 85, your future battery degradaion should be VERY small. Here is my range from new, when I Rarely charged it above 70%::

I think above calculation was way off! Having slept on the issue, I have come to the conclusion that the voltage ImBalance from the CAC ImBalance should ONLY be 20 mV at 100% SoC :-( 0-100% SoC wil produce (approx) 3,0 - 4,2 Volt increase on the brick(s) with the lowest Ah capacity. That means...

I looked up the Jason reported numbers and they were: Total Usable Original 60 61 58,5 85/P85/85D/P85D 81,5 77,5 90D/P90D 85,8 81,8 Original 70 71,2 68,8 75/75D 75 72,6 Software limited 60/60D 75 62,4 Software limited 70/70D 75 65,9 Interesting that I now have...

Hmmm, According to Jason, a Model S 70 2015 had 71.2 kWh Brutto and 68.8 kWh Netto - that is why I entered 68.8 kWh as Initial TeslaMate Battery Health page allows one to specify initial capacity. If one does not do that, the Page will use whatever maximum Capacity is hidden in the Teslamate...

Thanks for the replies! I know a little more now. I had a long trip planned for thursday (2 x 105 km at Danish Highway speeds of up to 130 kmph :)) so I decided to test my theory that the voltage imBalance was BMS Intentional and to correct CAC ImBalance. So I charged to 100% (third time in...

I updated my 2015.10 Model S 70D MCU1 to 2022.8.10.17 on March 3 - a few days later, when we turned on the Infotainment, we noticed that both front door speakers had no sound. I performed a Deep Reset (Wheel Config) and still no sound. Confirmed that the Center speaker, which is served by the...

I own an old Model S 2015.10 and have long assumed that even my old car balances 'all the time' but only when needed. My assumption was based on this my ImBalance Versus SoC graph from SMT data: The minimum ImBalance (of 20 mV) is on the GEOMEAN of my SoC window :-) One could wonder, why...

Yes, I read that! And Peter DID mention the Anode Overhang Effect: 'The mechanism that leads to the recovery of cyclable lithium was described by Gyenes et al. [197]and Lewerenz et al. [198]. Overhang areas of the anode, which face no cathode counterpart, can become a location of inaccessible...

A: My battery is original and the 2,4 kWh buffer is actually from Jason, whom is cited here: Brutto 71,2 kWh, Netto 68,8 kWh :) https://electrek.co/2016/12/14/tesla-battery-capacity/ B: SMT reports 64,9-65,2kWh nominal and 4kWh buffer. Matches totally TeslaMate Projected range of kWh Nominal /...

I don't disagree! I have used that very same Peter Keil graph since 2016, to decide that whenever possible, my Model S 70D should always be parked below 55% Shown Capacity :) So my ChargeLevel looks like this historically (from TeslaMate and the last year, all the long parking periods are...

My comment to Mr Keil's thesis on 18650 Panasonic cells, is that he newer followed up on the effect of resting the High SoC cells at a low SoC, to test whether Anode Overhang Recovery would take place. This paper tries to separate the Irreversible Calendar Aging from the possibly recoverable...

Yes, the probably most imprtant benefit from 'staying low' is to avoid the internal resistance growth from high SoC! I think one of the best graphs (although NMC and not NCA) is Jeff Dahns graph from his YouTube Longevity video. I think the internal resitance graph is dramatic, factor 1, for...

TeslaMate has no table of 'Nominal Capacity' The TeslaMate starting capacity is from the day that TeslaMate first calculated the 100% capacity, which was June 12 2021 for my car, so the 1,3% degradation is after that date. And a totally fair calculation based on what the Car reports...

As for Tessie being occasionally 'wrong' on Initial Usefull Capacity, I have filed a 'bug' report to a TeslaMate Opensource Feature provider, whoc has developed a Tessie similar Battery Health Page, which was wrong for the older Model S/X, because they have both a Typical and a Rated Range and...

Mu old Model S 70D 2015.10 seems to use Nominal kWh / 0,190 kWh/km or Nominal kWh / 0,150 kWh/km as well, when showing both Typical and Rated Range. I base/argue for these algorithms, by choosing the algorithm that give the least StdDev over multiple SoC :) And a confirmation calculation the...

To complete my reference to Anode Overhang, here is a graph showing how much Anode Overhang Recovery can be! The graph shows recovery (by resting a violated Prismatic Cell (Not LFP) first with a zillion either 6% or 12% SoC Cycles around P1==81% SoC, and the capacity Recovered when instead...

Yes, It is a good test. It should as well reveal that appart from the BMS calculating a more true capacity, LFP have reduced 'real' capacity when always shallow cycled! So it is not only a BMS challenge from the very, very stable Voltage at different SoC, but as well an inhomogenity in the...

Just wanted to inform that my 2015.10 pack (T15J....) which was mounted in my Model S 70D on October 5 2015 has the fuse box in the bottom. Here in Denmark we call the pack a Version 2.0. So much earlier than 2016+? :) Model: 1055893-00-C Serial: T15J0109835

I have an old Model S with separate Parking Brake Calipers. They were replaced already at car age 2.5 years. I have since heated up the parking calibers (and gear and motors) periodically by applying the brake for some seconds while driving. The Brake Calipers Gears and Motors are now 6 years...

My car has been parked for 12 hours and now sits at 52.6% SoC (and 51% Usable (Battery pack is at 2.5 Celsius)) and Min Cell Voltage is 3.722 V. So BMS surely thinks that 50% of energy is below 3,722 V meaning that 50% Voltage is approx 3,722 * 50 / 51 == 3.65V, which is not far from the...

PS: I do have two Voltage readings at higher SoC, but they were taken BEFORE disconnecting 11 kW charger, so are elevated. But they do show that 92,5% is at 4,099 V when charging, which argues that 100% is close to 4.2 V, so no capping :-(

Wonder how BMS calculates Nominal Capacity? My Model S 70D Oct 2015 with 93.000 km has CAC 220,7 - 225,0 AH I think my Nominal Capacity should be around 3,65V x 220,7Ah x 6 Bricks/Module x 14 Modules == 67.67 kWh But BMS/ScanMyTesla claims 65.1 kWh. If I reverse your numbers you have 77,9...

I can pin the productiondate a little better, as I have a Model S 70D which was produced October 5 according to a no longer existing XLSX on the Internet. My Battery has: T15J0109835 Yours is approx 732 numbers LATER so slightly newer :) T15J0110567 PS: As our batteries have fusebox on bottom...

Somebody proposed that summer/winter could affect the Rated Range. I have for years calculated Projected Range in Excel and have these historic data for my October 2015 Model S 70D.: Notice that minimum Projected Rated Range is always in December and maximum Projected Rated Range is always July...

I cancelled the 'to 95% SoC' charge at 82%, which was enough for our trip. Because stressing my battery JUST to get a nicer number makes little sense.. Today OBD2 reports Nominal = 64,6 kWh, but TeslaMate reports Projected Range of 346 km! So Nominal kWh is Down and Typical Range km is up :-(...

Aha, looks to be AVVG(MIN(Voltages), MAX(Voltages)) :cool: But the CAC seems corretly 'averaged' as your Average number is not in the Middle of Min and Max!! Perhaps BMS calculates CACAverage, CACMin and CACMax, but Voltage Average is calculated by SMT ??

Nope ScanMyTesla now report 64,7kWh Nominal and TeslaMate is semi stable around 340 km Range :-( Slightly strange given that 'asking' car to charge to 95% from 65% cause the car to calculate charge duration of 2h:25m or 2,42 hours, which at 10 kW charge speed means that 30% added is 24,2 kWh or...

If you opt in on the ScanMyTesla Beta (in Google Play AppStore) and wait for approval, then installs the downloaded update twice (My first install reported unchanged App version, but added Front Motor Signals, so was somewhat newer than the Releas. My second install totally changed APP UI and...

Yes, a drive plus leaving Phone connected for 20 minutes in car revealed a +/- 0,8% CAC imbalance on Model S 70D October [email protected]: And total capacity of approx 221Ah * 3,6V * 6 Bricks * 14 Modules = 66,83kWh total to compare with 71,2kWh new My usage pattern is charge as little and often...