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

[ciaranob]

I feel you. Since July it has been a furnace. Here. I travelled several days under an abrasive 44C temperature. This was also the first times I've seen the battery being 9C cooler then ambient surroundings so the A/C is definitely being used on the battery.

I guess it's when the car is parked that the battery is toasted.

Exactly - sitting roasting when parked - and I have not hooked up my EVSE to it when parked away in the garage but I suspect that wouldn't help in this case anyway.

PS: Charts updated

Sponsored

 

[ciaranob]

I hope that it can be replaced under warranty. I used Car Scanner again and have identified the module and also the cell that seems to have the problem. The SOC is about 20% lower in this one cell compared to others.

Well it looks like the Texas summer has deducted my low mileage 4S CT another 1% SoH - I'm reading 88.01% at this point and seem to have the steepest decline curve on the chart! Rather worrying given only ca 7600 miles on the clock. Might mention to SA next visit for this LHS charge port issue on drop off on Sept 11.

Battery cells look good I guess so seems to point squarely at the extreme day and night ambient temps we've had consistently for 3 months (we're talking 45 to 50+ C).

@Scandinavian - can you tell us how you got to the 'Tachometer'-like readout panel of the Cell Module SoC - I see a page where all the modules voltages are 'turned on' re toggle switches in the app and the SoC for each is turned off - is that where you found this display i.e. by toggling this option on? Thx, C.

 

[Scandinavian]

Here is a new update for you.

I have the readings from the CarScanner app below. But I have now seen that I have one cell that seems much lower in one module than all the rest. Not sure what is going on there. My range has dropped significantly on the GOM, so will see what the reality is when driving back home next week.

My range range on GOM at 75% SoC is only 210 km now and that used to be 280 to 300 km. No change of garage temperature, about 20 - 24 C. No difference in consumption over the last 1500 km’s, around 21 kWh/100 km. GOM seems not to be reliable at all just now. Have recently mostly charged on AC or 150 kW chargers.

SoH from app 90.68%
Mileage. 55 145 km (34265 miles)

I have no idea if the measured battery content in kWh even is correct here? Can the app be used for this? If possible my battery would only hold 60 kWh??? Can not believe this is in any way correct

 

[Scandinavian]

@Scandinavian - can you tell us how you got to the 'Tachometer'-like readout panel of the Cell Module SoC - I see a page where all the modules voltages are 'turned on' re toggle switches in the app and the SoC for each is turned off - is that where you found this display i.e. by toggling this option on? Thx, C.
[/QUOTE]
I created a new page and the looked at all the sensors or values that I could display. I scrolled down a long way so I could find something along the lines of BMS. There I found the Modules that held 6 cells in each, think there were 35 modules or so. I knew my bad cell was 180 so module 30 cell 6 took. Then I got asked for how to display the value as a graph or other ways.

 

[Tooney]

Well it looks like the Texas summer has deducted my low mileage 4S CT another 1% SoH - I'm reading 88.01% at this point and seem to have the steepest decline curve on the chart! Rather worrying given only ca 7600 miles on the clock. Might mention to SA next visit for this LHS charge port issue on drop off on Sept 11.

Have you been able to observe any changes in the performance of your car (range, charging times, etc.) potentially related to the changes in its SoH?

 

[ciaranob]

Have you been able to observe any changes in the performance of your car (range, charging times, etc.) potentially related to the changes in its SoH?

As of to date there is an observed 'shortfall' between like seasons of ca 20 miles for max GOM range predictions - now we know we cannot trust these for many uses but it is notable - that said I have taken less long distance trips this summer to help 'reset' the driving style guesstimates of range which might explain this and I need to wait through the Fall to properly compare to last year so we'll see.

@Scandinavian - occurs to me too that wasn't there some discussion previously around the GOM not only using recent driving style to guesstimate but also someone mentioned that once there is an underperforming or bad cell module the car for safety reasons regulates the accessible capacity to the poor modules max and hence why the GOM range predictions might be lowered significantly? Entire speculation on my part and I prob. need to think through this thought more before speaking it out loud!!

 

[Tooney]

@ciaranob Do you know if the SoH measurements that you or other owners are reporting here are the same as or correspond with the SoH results that either:
a. Porsche dealer would provide, or
b. the net number that is mentioned in text of Porsche's battery warranty?

 

[ciaranob]

@ciaranob Do you know if the SoH measurements that you or other owners are reporting here are the same as or correspond with the SoH results that either:
a. Porsche dealer would provide, or
b. the net number that is mentioned in text of Porsche's battery warranty?

Had this discussion at length here and elsewhere on the Forum but no a full dealership/factory measurement of Soh would take a long time i.e. not just hours but potentially a few days as a no. of tests and cycles have to be performed.

And even then, such a test even in itself will be more or less accurate depending on the current lifecycle of the battery i.e. better results generally obtained with a certain mileage or say more than 2 years of driving history, but again a no. of variables at play.

That said we have 3 cars to date that have had the factory Soh measurement done and in all three a corresponding OBDII reading was taken prior - results showed a max. of between 1 to 2% difference in values!

The OBDII readings are sometimes referred to as a 'flash' reading and no doubt that it is a far more crude and somewhat 'instantaneous' measure of the batteries Soh and as such would not 'stand up in warranty court" if claiming such!

No one outside of Porsche engineers know exactly what algorithim is being used in the PCM to determine this flash reading but for me it is not so much the absolute values (despite surprisingly appearing to be only slightly off) but the consistency of measurement 'vectors' that seem to be in the data from the 113 readings from 54 cars of all model years 2020-2023 from 17 different countries and all climate zones where sold!

These data at the very least can provide a sense of potential rate of degradation for your battery as compared to others and again at the very least something to have in hand should you request a SoH check for warranty purposes.

 

[Scandinavian]

New data.

SoH from app 90.68%
Mileage. 55 145 km (34265 miles)

 

[ciaranob]

[/QUOTE]
I created a new page and the looked at all the sensors or values that I could display. I scrolled down a long way so I could find something along the lines of BMS. There I found the Modules that held 6 cells in each, think there were 35 modules or so. I knew my bad cell was 180 so module 30 cell 6 took. Then I got asked for how to display the value as a graph or other ways.
[/QUOTE]

Thx - actually managed to figure it out right after I had asked the question , via the demo mode and see all the options now - app has an amazing level of customizations and data displays!!

 

[Johann55]

can you tell us how you got to the 'Tachometer'-like readout panel of the Cell Module SoC

It seems a new page with "SOC in cells" graph was recently added. I manually refreshed the templates then noticed it on Dashboard pages:

Settings>Dashboard>reset to default

 

[Gru]

Update:
2) 91.7
3) 24775 miles

last 5000 miles since previous data were exclusively on long daily trips from 400 to 700 miles (in warm climate), with only fast charging.

1) Delivery Soh: unknown
2) Current SoH: 92.6
3) Current mileage: 19300 miles
4) roughly 2/3 fast charging at 250kWh, 1/3 at 22kWh . Mostly up to 80%, unless for some long legs/trips where i would go to 95%/100%
5) Build date : delivery 07.2022

Climate Zone = Cool
Model = 2022 RWD Taycan ST with PB+

 

[ciaranob]

@Scandinavian
@Gru

Charts updated.

 

[ciaranob]

@lcarron
@Scandinavian

Thought I'd just mention that whilst we now know of Peter's plight with his battery (again my sympathies and such a pain to have to deal with on a road trip), I can't help but notice that the only two cars that show somewhat 'erratic' variations in successive SoH readings are your cars.

Now statistically and in order of magnitude re variations these do indeed seem minor if not down right trivial but the other cars with multiple readings generally show very consistent and gradual SOH declines.

Again I am strongly suggesting we not over interpret this but I would perhaps advice you @lcarron to keep tracking your Soh as you are and maybe keep an eye on your range predictions in case anything at all similar might be occurring with your car.

Now I believe yours is a 2022 model so probably/hopefully a totally different cause for the variations!

Regards, C.

 

[Scandinavian]

I can't help but notice that the only two cars that show somewhat 'erratic' variations in successive SoH readings

I agree with you. It seems my readings jumped up and down a bit.

The thing to keep an eye on is partly range predictions but also the quick drop in actual range and charge level. To drop 66% charge on a 145 km trip at 19C flat roads, was the main alarm for me!
we all appreciate how GOM jumps all over the place.

Sponsored