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-360km reported/402km NEW EPA=10.4% degradation (a bit too high, but nor bad)
So, as far as I can tell, taking the displayed range and dividing it by the new EPA (402km), is a decent quick indication of battery degradation
I'm pretty sure everyone that has talked to Tesla has said that it is based on the mileage reported in the car compared to the range listed on the Monroney sticker. (So for the OP it would be based on 380 km.)
By this logic, someone buying an 18" 2020 Performance vehicle today could switch to 20" wheels and immediately claim 7.2% degradation!
Isn't it just measured by what the total is when 100% charged? why would wheels matter if it's measured that way?
As long as it is not cold, nope, no reason at all you can't use it! I'm not sure why people are up in arms about using an inaccurate method, though they may have been taking offense to your concern about cold weather measurements (which cannot be relied upon because there is less energy available from a cold battery but it is only temporary). This method of using rated range is possibly optimistic if your car still displays the max rated range (some initial degradation may be hidden), but once it drops below that max rated range (which is when you would start caring), it is perfectly acceptable to use. For maximum accuracy, you should really charge to 100% (or at least 90% - but there is about 3-4 miles of uncertainty at 90% if you are not careful to get the decimal point on the SoC (which is not visible)). But 90% is obviously going to get you to within about 1% of the correct value.
For your SR+, it's ~219Wh/rmi/1.6093rkm/rmi*360rkm = 49kWh
As I said, your original question: "What is the starting point?" Is a good one. You might think it is 219/1.6093*380 = 51.7kWh, but I believe that is too low (the EPA test vehicle was 54.5kWh for the 2019 SR+).
A 2020 Performance Model 3 vehicle with 18" wheels selected could display 322 rated miles, and if you then change the wheel configuration to 20" wheels (without making any changes to the vehicle) that same vehicle would display 299 rated miles.
The energy doesn't change, of course!
Show me where the battery capacity is specified by Tesla. Pretty sure there is no number. Range is about it.
And honestly, it's what they decide to read out of the battery. It's pretty obvious when a battery is failing to 70%.
True, but i bet it would be measured on the configuration when purchased.
it is NOT based upon miles NOR original battery capacity.
By this logic, someone buying an 18" 2020 Performance vehicle today could switch their configuration to 20" wheels (without changing the vehicle or wheels in any way) and immediately claim 7.2% degradation!
What did you email them about?Suggest sending your question to [email protected]
They were responsive to my email a couple months ago
Most specifically, from the Tesla New Vehicle Limited Warranty
"The measurement method used to determine Battery capacity, and the decision of whether to repair, replace, or provide reconditioned or remanufactured parts, and the condition of any such replaced, reconditioned or re-manufactured parts, are at the sole discretion of Tesla."
Yep, Tesla will make the decision, it is NOT based upon miles NOR original battery capacity.
I'm going to guess that it's based upon the number of cells that have gone bad in the pack.
Well, I think this settles the question then
It actually doesn’t answer your original question at all - what are they comparing to? The other quotes from other sources you posted saying the range is based on “fixed EPA data” suggests that could be their benchmark. It is an unanswered question though and you would have to ask just the right questions at Tesla to a knowledgeable person, to find out.
Of course the measurement of the existing pack is up to Tesla and they would have the option of resetting it, rebalancing it, etc., before measuring. But they still have to use a valid method even if it is their choice. They can’t just make up numbers. Again, this is unfortunately why lawyers exist.
It's just not accurate.
PREACHOP has STILL not indicated their method of measurement sufficiently that they should be taken seriously.
rated range does NOT vary seasonally. The battery’s ability to take a charge can be impacted by cold weather, but that’s maybe 1-2% at most.
it is correct that kWH is the metric that is warranted, but rated range @ 100% x appropriate wh/mi constant should be darned close, so nothing wrong with using rated range as a proxy.
this is maybe the 100th thread by a relatively new owner consternated at first year degradation, incorrectly assuming that will continue straight line, confused by the lack of definitive info from Tesla, and worrying unnecessarily. I’d recommend researching degradation curve. That should put everyone’s mind at ease. It should be a WIKI that is required reading for all members before allowing a degradation post.
update:
got an answer from the service center: my car throretical maximum capacity was and is always going to be 380km
Cars from nov 2019 onwards have had their motors changed and the new ones are more efficient, not going to happen to mine
So, as of now, I have 6% degradation after 6 months, which is allegedly normal
SC told me they will do nothing until deradation hits 30% loss of 380km