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

[ciaranob]

15000km.

Meant to add that we've seen some variation in SoH readouts with OBDII's depending on a number of factors so indeed will be interesting when you take addl readings as to whether you 'recover' a percentage point as some have - I've actually seen the opposite!!

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[MartyMeatball]

Meant to add that we've seen some variation in SoH readouts with OBDII's depending on a number of factors so indeed will be interesting when you take addl readings as to whether you 'recover' a percentage point as some have - I've actually seen the opposite!!

I took another reading last week and my SoH increased to 88.9. Previous reading was 88.3.

 

[ciaranob]

I took another reading last week and my SoH increased to 88.9. Previous reading was 88.3.

Excellent thx - will update asap!

 

[ciaranob]

I took another reading last week and my SoH increased to 88.9. Previous reading was 88.3.

Forgot to ask - can you update me on your current mileage too?

 

[ciaranob]

I took another reading last week and my SoH increased to 88.9. Previous reading was 88.3.

I updated the chart in post #1 with a guesstimate for now as to your current mileage being ca 13000 - please advise - thx.

 

[MartyMeatball]

Forgot to ask - can you update me on your current mileage too?

11.5K

 

[rs38]

my car lately jumped from 89.4 to 90.9 % (29k km) and many charging sessions also seem to ignore the SoH and load more energy than SoH would allow.

 

[ciaranob]

my car lately jumped from 89.4 to 90.9 % (29k km) and many charging sessions also seem to ignore the SoH and load more energy than SoH would allow.

Interesting re latter but indeed we should look at SoH readings (at least from our 3rd party OBDII tools) as being +/- 1%.

 

[Charlie]

EDIT - I WILL UPDATE THE CHART HERE AS MORE DATA IS ADDED VS CONSTANTLY REPOSTING BELOW.
EDIT #2 - Re-named climate zones to better reflect average temps!


These data from 37 cars with 44 readings which include 7 users from a German Forum (courtesy @rs38) and a single data point from a Porsche marketing/news article. Clearly not a statistically significant sum but interesting nonetheless and some trends developing - in particular the known slightly higher degradation of SoH in hot climates.

Also remember that the SoH% is believed to be a % of, for example, the usable 83.7kW of the Performance+ 93.4kW capacity battery i.e. excludes the car's buffered/protected charge.

NOTE: What SoH reads via OBDII actually still needs to be 100% confirmed as if in fact a measure of the entire 93.4kWh then the impact will be different e.g. SoH of 90% for the full 93.4 kWh PB+ is 84.1 kWh - buffering 10% of this as Porsche supposedly does leaves a usable 75.7 kWh; if OBDII SoH is in fact as we use here only of the already buffered volume of 83.7 kWh then a 90% SoH leaves a usable 75.3 kWh - not a huge difference but needs to be cleared up. Forum Mbr. rs38 may have since provided the proof here in his post #38 in this thread which suggests OBDII SoH being a read of the available battery i.e. the buffered 83.7 kWh and not the 93.4 kWh rated capacity.

Note a relatively consistent hot to moderate climate more degraded SoH trend. Cold country SoH's appear to straddle hot/moderate and cool climate trends but numbers not statistically significant as yet.

I added total guesstimate predictions using pseudo-values leaning on the pessimistic side (I hope ) of future extrapolation of the SoH logarithmic curves for each climate zone.

Also a possible slight bias towards lowest Soh readings to date from early model year Turbo/S cars (not statistically robust as yet).

View attachment 54270

Input:

Spreadsheet too big to bother posting but can do if needed.

Bit of an 'oddball' chart but another way to visualize the rate of loss of SoH:

View attachment 52704

Reference for climate zones in table:

View attachment 52706

View attachment 52707


I am also adding the entire charging history of my car for those interested in long term trends including winter - summer variations etc - of course my car in a hot climate.

View attachment 52290


Possible trends emerging (not yet statistically valid) for SoH retention in colder vs hotter climates - Li ion batteries generally do not like heat stress so do not do as well in very hot climates.

Some external data from these links:

https://www.geotab.com/blog/ev-battery-health/
https://www.geotab.com/blog/ev-range-impact-of-speed-and-temperature/
https://www.geotab.com/blog/ev-range/

Here are some addl. variables that were documented in a much larger dataset involving non-Porsche EVs (links above) which clearly indicated excessive use of DC charging in these same hot climates has a further negative impact on SoH over time - the first chart's Level 1 charging is not really relevant as extremely few of us would use a std. wall outlet to charge our car! The Level 2 charging curve is relevant but our data suggest more of an impact than for the population of cars in this story;

An envelope of all data - the lone Porsche data point appears optimistic for most i.e. 5 of the 10 forum cars are below 91% SoH at under 20K Miles (vs 91% at 62K miles on the Porsche Marketing car) - however, as pointed out by @rs38 , there is clearly potential for 1 to two percentage points seasonal variation which is not universally represented in our data to date.

SoH plotted against model year and build date - don't have exact months for many of the German Forum and some of teh US Forum cars (hence couple of rows in data) but fairy clear trends.

______________________________________________________________
How many of you asked for or were provided data on the SoH of your PB+ battery on delivery?
I certainly did not have this on my delivery list to ask when I got mine , but would be useful to set a baseline if that data available.

Here is a readout of my current SoH which may or may not be an entirely accurate record of the true SoH. Nonetheless it would be interesting if all those who have a proper OBDII could read off their SoH and mileage to start to see if there are trends pt. forward with again the proviso that we first might need to establish how accurate these OBDII snapshots actually are.

TBH I thought my SoH would be higher considering I only have 4000 miles or so on the clock and only ca 300 kWh of direct 'fast' charging at EA stations to date - but I am entirely ignorant as to what the delivery SoH starting pt. should be.

So at a minimum say share:

1) Delivery Soh - suspect very few if any actually have this?
2) Current SoH
3) Current mileage
4) kWh DC charging (assume remainder at home or work/destination EVSE) - see #3 below on how to obtain.
5) Build date (or just MY if you're not sure)

For me:
1) unknown
2) 92.7%
3) 4000 miles
4) 303 kWh
5) Oct 2021

Could add # times charged to 100%, how often charge dropped below 20 or 10%, and more but asking a lot already!

Cheers, C.

PS: I'm using the Vgate's vLinker MC+ OBDII with a Bluetooth 4.0 connection to the Car Scanner iOS app.

Excellent thx - will update asap!

New reading for 2020 4s
2nd reading SOH for 2020 4s delivered Aug 2020
5-4-23 SOH 96.25 at 9750 miles occasional DC charging
original post
12-1-22
95.25% at 9225 miles
using VLinker MC+ with car scanner app

 

[ciaranob]

my car lately jumped from 89.4 to 90.9 % (29k km) and many charging sessions also seem to ignore the SoH and load more energy than SoH would allow.

Can you update me o your current mileage - thx.

Have three prior readings from you for ref here:

 

[ciaranob]

New reading for 2020 4s
2nd reading SOH for 2020 4s delivered Aug 2020
5-4-23 SOH 96.25 at 9750 miles occasional DC charging
original post
12-1-22
95.25% at 9225 miles
using VLinker MC+ with car scanner app

Perhaps not too surprising to see same reading after after only additional 525 miles - but all data is good data here

 

[ciaranob]

Can you update me o your current mileage - thx.

Have three prior readings from you for ref here:

Please ignore - apparently I need to get glasses !!

 

[ciaranob]

All recent additions added to chart in Post 1

 

[rs38]

my car lately jumped from 89.4 to 90.9 % (29k km) and many charging sessions also seem to ignore the SoH and load more energy than SoH would allow.

meanwhile with increasing avg outside temps I am at 92.1%...
So I am expecting 102% late August ?

 

[ciaranob]

meanwhile with increasing avg outside temps I am at 92.1%...
So I am expecting 102% late August ?

Interesting!! I will be traveling (actually in your neck of the woods next week !) for next few weeks but will be curious to see if there is any change in my SoH as it most definitely has been consistent in respect not increasing.

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