Elon Musk ordered Tesla software to be optimistic on range
Discussion
As I understand, when new and at 100% charge they display rated range from EPA / WLTP and not any algorithm based range which could use previous average consumption and ambient temp for example.
Add to that UK cars using EPA rated range not WLTP range from the Tesla site, no wonder consumers are confused.
Add to that UK cars using EPA rated range not WLTP range from the Tesla site, no wonder consumers are confused.
Tesla have to test using the local requirements, EPA in the US, WLTP in Europe etc.
This gives an efficinecy figure equivalent to MPG.
Take the available kwh in the battery as reported by the BMS, apply the efficiency figure and you get a range. Tesla use the EPA figure in the car on the M3, MY and MS and MX since the refresh.
The available battery capacity will however vary due to temperature, BMS calibration drift, cell inbalance etc, so its rare the displayed figure will exactly match the EPA rated range for that car even in the US. It does not take into account driving style, etc.
Also worth noting, Tesla use different batteries in different parts of the world for the same model - the M3 and MY LR have about 3kwh more capacity if built in the US.
Tesla apply the rated effiiency to the theoretical battery size using the relevant local requirements and thats what they have to advertise
Real world rane is something again. Since the advent of the heat pump in Tesla, the range varies much less throughout the year and generally gets very close the EPA rated efficiency except when driving above 60mph. Drive at leasurely below 50 in summer and you can easily improve on the rated efficiency, drive on a UK motorway ay 80 and you'll do much worse. It's different to ICE where stop start traffic and low speeds can be bad and a steady 70 can be quite effiecient, its just a function of battery compared to fossil.
What Musk seems to have ordered in the past was to exagerate the middle ground, no idea if its true, I've had Teslas since 2015 and back then the cars displayed something different again (what Tesla called "Typical" and not based on a rating system at all). Back then, even Typical was optomistic and maybe that was a reflection of the fiddle, or it was just a case of they've learnt how to be more efficient
This gives an efficinecy figure equivalent to MPG.
Take the available kwh in the battery as reported by the BMS, apply the efficiency figure and you get a range. Tesla use the EPA figure in the car on the M3, MY and MS and MX since the refresh.
The available battery capacity will however vary due to temperature, BMS calibration drift, cell inbalance etc, so its rare the displayed figure will exactly match the EPA rated range for that car even in the US. It does not take into account driving style, etc.
Also worth noting, Tesla use different batteries in different parts of the world for the same model - the M3 and MY LR have about 3kwh more capacity if built in the US.
Tesla apply the rated effiiency to the theoretical battery size using the relevant local requirements and thats what they have to advertise
Real world rane is something again. Since the advent of the heat pump in Tesla, the range varies much less throughout the year and generally gets very close the EPA rated efficiency except when driving above 60mph. Drive at leasurely below 50 in summer and you can easily improve on the rated efficiency, drive on a UK motorway ay 80 and you'll do much worse. It's different to ICE where stop start traffic and low speeds can be bad and a steady 70 can be quite effiecient, its just a function of battery compared to fossil.
What Musk seems to have ordered in the past was to exagerate the middle ground, no idea if its true, I've had Teslas since 2015 and back then the cars displayed something different again (what Tesla called "Typical" and not based on a rating system at all). Back then, even Typical was optomistic and maybe that was a reflection of the fiddle, or it was just a case of they've learnt how to be more efficient
I have mine set to % of battery rather than optimistic range at the top of the screen.
The consumption chart is pretty accurate when used, and if you’re using the sat nav you should get plenty of warning that you may not make it. The “highly optimised” number at the top of the screen is the equivalent of a range calc based on optimum mpg.
Stupid, but it is what it is.
The consumption chart is pretty accurate when used, and if you’re using the sat nav you should get plenty of warning that you may not make it. The “highly optimised” number at the top of the screen is the equivalent of a range calc based on optimum mpg.
Stupid, but it is what it is.
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