Range Drop

[SergeyIndy]

@MidwestPCar, how's the CarScanner data points gathering going and posting for us to evaluate?

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[Gino]

Just tagging myself on this feed. Also have 2020 4S. When I bought it in December 2024 it gave 200 miles summer '25 220 mile. Then in December '25 started to shown 160 - 170miles.

Paid for a battery conditioning check from Porsche which showed 90% capacity then 1 month later started to get frequent 'Electrical Fault' errors. Chun advised correctly being a defective cell which has just today been repaired.

Lets see if the range improves!

How many miles on your 2020?

 

[RAHRCR]

My Taycan is nearly 4 years old. It has held its range constant since new with temps being normalized. The key is adjusting tire pressures appropriately throughout the year.

 

[linesy]

How many miles on your 2020?

52k miles

 

[Gino]

Wow! Not even close to the 100K warranty level but I guess the 2020s pretty much expect this can happen.
I’m hoping my 2021 delivered in Jan/2022 will not have any HV battery issues for a very long time.

 

[MidwestPCar]

@MidwestPCar, how's the CarScanner data points gathering going and posting for us to evaluate?

Thanks for asking @SergeyIndy

Just finally got a moment and did it.... and everything looks good to me.....
Images attached from tCanPro and CarScanner attached...

Does anyone see anything amiss?

Maybe it was just my spirited driving on the highway...

tCanPro....

CarScanner

 

[SergeyIndy]

All looks good to me, @MidwestPCar, I am also at 86% SoH but my max usable Battery Energy calculates to about 75kWh and yours to 73kWh. You divide battery energy value of 48.95kWh by SoC Display of 66.57% to get to 73.53kWh when at 100% SoC.

I do not think that is significant but the way you use that absolute value to estimate your Range for current trip using currently shown by car efficiency. For example, if I am on my drive to work, I know that car estimates range based on historical drives but not my current drive, so if I see the car reporting for the current drive 37.5 kWh/100 miles efficiency, this tells me that my range is 200 miles.

My point is that I CarScan every 1k miles, look for cell graphs as a precaution, and then note my Battery Energy. Then when I drive if my efficiency is better than 37.5 kWh/100 miles in the example above then I know my Range is over 200 miles and I expect it to rise if temps are good or go lower of temps go lower.

This is my SoH trend crossing 3 years this month since car was made in April of 2023. This is by some accounts would be considered not very good, @prj, if I am a 2023 and you are a 2020 with original battery. @prj reports that much older and higher mile examples score in the 90s.

 

[chun]

My car’s SoC HR at 100% is 79.22 kW usable - and I get very similar range to you.
Was a bit lower before I had a couple modules replaced.

If anything, you’re not driving hard enough

 

[MidwestPCar]

All looks good to me, @MidwestPCar, I am also at 86% SoH but my max usable Battery Energy calculates to about 75kWh and yours to 73kWh. You divide battery energy value of 48.95kWh by SoC Display of 66.57% to get to 73.53kWh when at 100% SoC.

I do not think that is significant but the way you use that absolute value to estimate your Range for current trip using currently shown by car efficiency. For example, if I am on my drive to work, I know that car estimates range based on historical drives but not my current drive, so if I see the car reporting for the current drive 37.5 kWh/100 miles efficiency, this tells me that my range is 200 miles.

My point is that I CarScan every 1k miles, look for cell graphs as a precaution, and then note my Battery Energy. Then when I drive if my efficiency is better than 37.5 kWh/100 miles in the example above then I know my Range is over 200 miles and I expect it to rise if temps are good or go lower of temps go lower.

This is my SoH trend crossing 3 years this month since car was made in April of 2023. This is by some accounts would be considered not very good, @prj, if I am a 2023 and you are a 2020 with original battery. @prj reports that much older and higher mile examples score in the 90s.

Thank you. I get that math. I think I need to pay attention to "current efficiency" as I drive. This simple math will help.

I will return the data favor with data. I added the implied usable per your math.

Date	Mileage	Notes	SoH	SoC	Battery Energy (KwH)	Implied Usable (KwH)
2025-10​	50,100	General	84.84%​	53.73%​	37.9​	70.54
2025-11​	50,507	Right after battery recalibration	89.54%​	96.86%​	77.4​	79.91
2026-04​	51,787	General	86.36%​	66.67%​	48.95​	73.42

What I really was pleased about was the bump I received with the battery recalibration. For me, at the time, I gained ~4.5% SoH and ~9.5 KwH of usable battery. I seem to be receding now with use (expected), but I'll do a recalibration soon. I expect the "bump" to be less drastic.
@SergeyIndy I don't know if you are tracking with any battery recalibrations.

Good stuff! Data rules!

(P.S. yeah, I don't drive many miles, as I work from home)

 

[SergeyIndy]

My car’s SoC HR at 100% is 79.22 kW usable - and I get very similar range to you.
Was a bit lower before I had a couple modules replaced.

If anything, you’re not driving hard enough

I go by SoC Display value as this is what the car reports. I assume SoC HR is a more accurate value as it may include internal buffer that is below 0% SoC Display.

 

[SergeyIndy]

@MidwestPCar, I recalibrate ever 5k miles but do not see this dramatic increase. Recalibration is helpful to detect bad cells as they come forward after that. Also, the trend of SoH increase after recalibration and then settle is expected.

 

[Regular]

SoC_true = 92%*SoC_display + 6%

Which also tells us that the bottom buffer is 6% and top buffer is 2%.

SoC_HR in carscanner is lower precision than SoC_true (either rounded down or just converted to single byte). One easy tell is that SoC_HR only ever ends with .627-0.980 and .0 (in 5/255 intervals).

SoC_true matches what Porsche uploads for remote diagnostics as BMS_SOC_HiRes.

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