but the battery comparison accuracy directly depends on data accuracyFWIW TeslaFi shows "your car" and "fleet" for comparison
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but the battery comparison accuracy directly depends on data accuracyFWIW TeslaFi shows "your car" and "fleet" for comparison
I saw a breakdown somewhere but I think the basic approach isTeslafi and Teslamate use the same guesses as to battery health. Teslafi just compares it with other guesses using the same method.
the bigger the last charge the more accurate it’s likely to be as it reduces rounding errors
what’s the starting point given the same model of car can have different batteries?
Teslamate does mention the importance of getting good data at the start of the car's life. As you say what you start with is probably the biggest factor on how much you have left.It does give you the option to specify your starting point.I saw a breakdown somewhere but I think the basic approach is
- from the last charge, work out the efficiency from rated miles added and kWh added - so the bigger the last charge the more accurate it’s likely to be as it reduces rounding wrrors
- using the efficiency x rated miles available tells you how much energy you have stored. Not sure if that’s temperature dependant or not
- divide by the state of charge gives total energy that can be stored
And then as suggested, what’s the starting point given the same model of car can have different batteries?
They're all based on the mythical efficiency figure which as you say George, varies considerably with season.This dashboard is meant to have a look of the Battery health based on the data logged in Teslamate. So, the more data you have logged from your brand new car the better.
**Degradation** is just an estimated value to have a reference, measured on **usable battery level** of every charging session with enough kWh added (in order to avoid dirty data form the sample), calculated according to the rated efficiency of the car.
Can you see the battery version for your car in Teslafi anywhere?TeslaFi decodes the "options" API data, dunno if that distinguishes Battery Version? But if so it could aggregate only "fleet members" that match.
Cars age in years | 0 | 0.5 | 1 | 1.5 | 2 |
Nominal Full Pack kW/h - SmT | 55.1 | 53.0 | 52.6 | 51.9 | 51.5 |
Battery reduction kW/h - SmT | 0.0% | 3.8% | 4.5% | 5.8% | 6.5% |
Miles @ 100% shown by car | 263.49 | 260.98 | 257.07 | 255.51 | 251.22 |
Miles reduction | 0.0% | 1.0% | 2.4% | 3.0% | 4.7% |
I would have thought if it was there the discussions would have been a lot shorter.
which one is correct?