It's only showing over 560 km in Tessie, but never in car. My car finally started dropping range at 21.000 km and it happened really steep. Its showing 545 km now with 94.3 kWh nominal.
Yes, I know the issue from Teslafi.
Teslafi get the range in hundreds of km, but the SOC only in whole no digit value.
Teslafi jumps up and down due to the half perfent rounding up and down but the range values from scan myctesla logged with teslalogger is very stable.
But in car 560km is the solid max.
Can you check one thing, when parked at roughly 63% SoC, car will drop/adjust at least 2-3% within 1 hour after brief sleep. It is happening every time at that SoC since car was new, not sure why BMS is not learning anything. It's always shown in energy app - park tab. There are other BMS adjustments but they are usually around 1%; not as noticeable for most.
I already know my SOC is very stable, I can show data on it.
Since the day the nominal full pack reached 98 kWh which from other calculations is/was correct, even after a long drive, when I park the SOC stays virtually the same.
When the BMS underestimated the capacity it always increased after a longer drive.
Using scan my tesla and SOC with .1 resolution I see this very clear.
This is the arriving from a 45+45km drive with sebtry on during the shopping visit (1hr).
At about 16 (4pm) I arrived at home.
Teslafi shows 40% but the BMS value was 39.9%.
1 1/2 hour later I went to the car to check again, and then had 39.8%. (Still shows 40% on teslafi).
The SOC level do not matter for me, I mostly charge to 55% but I might have a sleep at around 63% from a trip, I’ll look for it.
I guess the 3% loss includes a drive before?
Sounds like a capacity overestimation.
When driving the SOC is preliminary and calculated via energy content minus used energy.
When parking, and sleeping the battery voltage can be measued (in sleep the OCV can be measured), after this the SOC is adjusted.
I do not have any own data on overestimates, but on underestimates.
One thing you can do is check the SOC, and also the range (use km, as it is the highest resolution).
Check it when parking andvthen check it after 15-20 minutes.
Both my MSP and M3P have adjustet the big adjustment before it falls asleep.
What happens when you charge? Not a 1-5% charge but 30% or more?
If you set for example 70%, what is the displayed SOC about 20-30min after the charge?