🔋 Baseline for HV Battery SoH Performance (Battery Degradation Data by Taycan Owners)

[ciaranob]

I must grab one of these readers. Given I almost exclusively use Ionity 350kw chargers and charge to 99% (often getting good chunks of charge at 250kw plus) it’d be interesting to see where I’m at after 31,000 miles in 21 months. Thank goodness it’s a lease….. ?

I'd be interested too

There are in fact about 7 readings in the chart with over 30K miles to date and retain values between 89-93 for SoH - and one (second hand info) out to nearly 100K thats down to 86.

 

[SergeyIndy]

Reporting my numbers after having the car home from PPF:

1) Delivery Soh = 99.95% putting same number as Current as measured one and only time
2) Current SoH = 99.95% measured today July 1 (74 miles) after it was delivered June 22 (27 miles)
3) Current mileage = 74 miles
4) kWh DC charging = 1 as dealer charged it once to 100%, then drove 14 miles for PDI requirement
5) Build date - April 18, 2023

I would like to update my numbers to capture anticipated rapid decline in SoH from new. I think a loss of 2.79% of health in the first 500 miles is pretty dramatic. Therefore, will continue to do reads every 500 to detect when it starts to slow down. On the upside, the Cell Voltage graph looks very healthy (to me) with consistent voltage range of min of 3.869 to max of 3.875 and no dead cells.

1) Delivery SoH = 99.95% 6/22/2023 (Tires: 6.7mm average across all)
2) Current SoH = 97.16% 8/18/2023 (Tires: 6.4 mm average across all)
3) Current mileage = 501 miles
4) kWh DC charging = Negligible for reporting: 1 to full during PDI by dealer and 1 short at EA for testing, otherwise, just charged 3 times at home on AC overnight from 20% to 85% using Timer.
5) Build date - April 18, 2023

 

[ciaranob]

I would like to update my numbers to capture anticipated rapid decline in SoH from new. I think a loss of 2.79% of health in the first 500 miles is pretty dramatic. Therefore, will continue to do reads every 500 to detect when it starts to slow down. On the upside, the Cell Voltage graph looks very healthy (to me) with consistent voltage range of min of 3.869 to max of 3.875 and no dead cells.

1) Delivery SoH = 99.95% 6/22/2023 (Tires: 6.7mm average across all)
2) Current SoH = 97.16% 8/18/2023 (Tires: 6.4 mm average across all)
3) Current mileage = 501 miles
4) kWh DC charging = Negligible for reporting: 1 to full during PDI by dealer and 1 short at EA for testing, otherwise, just charged 3 times at home on AC overnight from 20% to 85% using Timer.
5) Build date - April 18, 2023

Data added to chart (Post 1).

 

[Genau]

1. Delivery Soh - unknown, but I suspect not much better than current SoH since range has remained about the same
2. Current SoH - 75.57% , with one cell at a lower voltage than the rest
3. Current mileage - 38,870 miles
4. kWh DC charging - probably over 10,000 kWh (majority DC fast charging)
5. Build date - June 2020
   
   

 

[Jonathan S.]

^ Curious what kind of range you’re seeing for highway driving in favorable weather conditions with that SoH?

 

[Genau]

^ Curious what kind of range you’re seeing for highway driving in favorable weather conditions with that SoH?

Between 200-210 miles with the factory 20" wheels on all seasons, and around 186 miles with the larger and wider summer wheel/tire set. I have the PB+ battery.

 

[lcarron]

Well did the update and as with @TurboInCold and rs38 my Soh has not changed at all - exact same value today Jul 25 as taken July 18 i.e. still at 88.9%.

@lcarron - I do wonder if one of your readouts was a bit of an anomaly i.e. either the lowest reading at 85.9 or the post-OTA reading.

Notice that you I had a 1.6% drop in your last two pre-OTA readings from 87.5 to 85.9 i.e. the second highest in the database to date. The post-OTA readout of 88.3% measured from this low 85.9 of course gives a 2.4% increase but if for grins we measure instead the difference from the 87.5 readout (i.e assume the 85.9 anomalous) you only got a 0.8% increase from the post-OTA value of 88.3%

So again, if for some reason that 85.9% readout was just highly anomalous the rest of your data variation is well within the observed variations in most all of the other cars (+/- 1.5%).

Does not for a minute negate that you got that lowest readout but I guess the test will be point forward perhaps as to where your trend continues from - please keep us informed !

The only other cars with pre- and post- readouts are TurboInCold, rs38 and myself and all our car's Soh stayed exactly the same.

Cheers, C.

Hello,

Are you a data scientist by chance?
I recovered all the SOH reading from my phone and plotted it below. It is looking like an anomaly but I'm not too sure. I think it was worth it to wait a month after the OTA.

 

[Scandinavian]

1. Delivery Soh - unknown, but I suspect not much better than current SoH since range has remained about the same
2. Current SoH - 75.57% , with one cell at a lower voltage than the rest
3. Current mileage - 38,870 miles
4. kWh DC charging - probably over 10,000 kWh (majority DC fast charging)
5. Build date - June 2020
   
   

Have you ever tried to run the battery to 5-10% and then charge to 100% on AC? And then drive the car down again to 5-10% and finally charge to 85% and read the SoH? That might balance all the cells so they ar much more equal? Would be very interesting to hear what the result would be after Such a cycle.

Unless of course you have a damaged cell that can not be reset unless Porsche change it.

 

[Genau]

Have you ever tried to run the battery to 5-10% and then charge to 100% on AC? And then drive the car down again to 5-10% and finally charge to 85% and read the SoH? That might balance all the cells so they ar much more equal? Would be very interesting to hear what the result would be after Such a cycle.

Unless of course you have a damaged cell that can not be reset unless Porsche change it.

For AC charging I normally start above 20%, and occasionally charge to 100% to see if it helps with load balancing. I did this the day before I obtained the 75.57% SoH measurement. Do you think discharge to 5-10%, and the rest of the protocol you outlined above, will make much difference to load balancing compared to what I've been doing?

 

[Scandinavian]

For AC charging I normally start above 20%, and occasionally charge to 100% to see if it helps with load balancing. I did this the day before I obtained the 75.57% SoH measurement. Do you think discharge to 5-10%, and the rest of the protocol you outlined above, will make much difference to load balancing compared to what I've been doing?

I am not sure since most of the balancing takes place at higher charge levels ( about 80%+). And if you have had it charged to 100% it should have balanced the cells as I understand it. In that case I would not discharge the battery below 10%

Only thing that might improve to discharge to 10% would be that the BMS learns where the lower level is.

Perhaps a call to Porsche service and ask them to check the imbalance on the cells?

 

[ciaranob]

Hello,

Are you a data scientist by chance?
I recovered all the SOH reading from my phone and plotted it below. It is looking like an anomaly but I'm not too sure. I think it was worth it to wait a month after the OTA.

I’m indeed a scientist (PhD in geology/geophysics) and work with data but not a data scientist per se

Agreed re let’s get more readings here - no idea exactly what caused this ‘apparent’ anomalous reading if indeed that but a no. of events might have contributed.

BTW, I assume when you say you retrieved all your SoH readings “from your phone” you just mean the times you hooked up the OBDII tool and read them, correct I.e. you’re not extracting these by some other means from the car, right?

Would be great if we could tap directly into however the PCM is providing this readout/guesstimation!

 

[ciaranob]

Hello,

Are you a data scientist by chance?
I recovered all the SOH reading from my phone and plotted it below. It is looking like an anomaly but I'm not too sure. I think it was worth it to wait a month after the OTA.

Hey - I can see a minimum of 15 readings in your chart from Jan to Aug 2023 (the longer 'flatter extensions might hold more?) - correct? Any chance you could post or PM me each readout (or even just one per month) but with a da date and mileage so that I can then load to the main chart?

I only have 3 readings from you as follows:

Mileage 15000 Soh 87.5 Date Jan 2023
Mileage 20000 Soh 85.9 Date Jul 17 2023
Mileage not provided - Soh 88.3 Date Jul 22 2023

Cheers, C.

 

[Johann55]

1. Delivery Soh - unknown, but I suspect not much better than current SoH since range has remained about the same
2. Current SoH - 75.57% , with one cell at a lower voltage than the rest
3. Current mileage - 38,870 miles
4. kWh DC charging - probably over 10,000 kWh (majority DC fast charging)
5. Build date - June 2020
   
   

Battery energy 50.8 kWh at 81% SOC suggests only 62.7 kWh available at 100% SOC. What is the number of kWh when you fully charge the battery?

Could you post the cell voltage graph?

By the way, what is your [BMS] ELaunch counter (full throttle counter)?

 

[Genau]

Battery energy 50.8 kWh at 81% SOC suggests only 62.7 kWh available at 100% SOC. What is the number of kWh when you fully charge the battery?

Could you post the cell voltage graph?

By the way, what is your [BMS] ELaunch counter (full throttle counter)?

Here's the cell voltage graph. Car Scanner says the highest cell voltage is 3.99V (with a cell voltage max index of 10), and the lowest (standing out in the graph below) is 3.938V (with a cell voltage min index of 7). I'll check battery energy at 100% SoC soon. Could you tell me where to find the Elaunch counter?

 

[tchavei]

Here's the cell voltage graph. Car Scanner says the highest cell voltage is 3.99V (with a cell voltage max index of 10), and the lowest (standing out in the graph below) is 3.938V (with a cell voltage min index of 7). I'll check battery energy at 100% SoC soon. Could you tell me where to find the Elaunch counter?

I see a bad cell