Hey thx - did you swap out or is this someone else's ride
?
Great info - thx - chart updated.
Hi,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
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 53335
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.
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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.
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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
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)
Excellent - thx, will update when I get home.
Chart updated - includes 4 readings from you to date (90.3, 88.9x2, 88) - yours is the warm trend car with higher mileage in the chart. SoH degradation trend in line (in respect slope of curve) with others it seems.
I believe I posted some published data in this thread but not that dissimilar overall but may have different variance in specific climate zones - generally skewering ca. 10% degradation over first 8-10 years in Teslas and Porsche of course not around long enough yet to compare.
Thx for sharing - will be sure to add to chart today - whilst there is data to support the negative impact of DC vs. pure AC charging (I have a no. of links and charts in this thread) your drop may simply be simply coincidental in that it is a fairly typical decrease in SoH for that mileage and usage period - but indeed good to track and exactly why I asked folk for total DC charging history if available
Hey Ben - is your total mileage then ca 25000 km or only 15000 km? Thx. C.
Perfect - thx!
