Tesla App showing different kWh than car

[Dani S]

Hi everyone, I am new here and would appreciate your help.

Charging at home on the normal wall plug usually 3kWh was working fine. About a month ago, something in the app changed and app is showing 2kWh but the car is showing 3kWh. Charging time is corresponding the 3kWh so its the App that is not showing the charging correctly. I have updated the App but still the same. If anyone can shed some light on this one.
Thanks in advance,
Dani

 

[UncleCreepy]

Presumably we are talking about the power at which you charge which is 2 kW vs 3 kW (kWh is energy, kW is power). Also, just to avoid incorrect answers let me point out that you are in Austria where the nominal mains voltage is 230 V, thus the 2 or 3 kW.

I wouldn't be too concerned about the inconsistency. It might as well just be a rounding error. It's kinda weird though, I mean it's not a 3rd party app that might do things differently.

Is the car consistently showing 3 kW while the app is showing 2 kW or is that just happening occasionally? 230 V x 12 Amps equals 2.76 kW. You might just be close to a trigger point where the displayed power switches from 2 to 3 kW.

 

[Dani S]

Thanks for your quick reply. The car is constantly showing 3kW and the app is on 2kW. Normally it should be 3kW (always was until this app glitch or whatever this is now).

once again big thanks!

 

[Dani S]

To add to this, app is always showing 1% less charge than the car. (i.e car is showing 71%, ap showing 70%).

 

[sp8962]

Presumably we are talking about the power at which you charge which is 2 kW vs 3 kW (kWh is energy, kW is power). Also, just to avoid incorrect answers let me point out that you are in Austria where the nominal mains voltage is 230 V, thus the 2 or 3 kW.

I wouldn't be too concerned about the inconsistency. It might as well just be a rounding error. It's kinda weird though, I mean it's not a 3rd party app that might do things differently.

Is the car consistently showing 3 kW while the app is showing 2 kW or is that just happening occasionally? 230 V x 12 Amps equals 2.76 kW. You might just be close to a trigger point where the displayed power switches from 2 to 3 kW.

It is as @UncleCreepy writes likely just a rounding error / change introduced with the last app update, I'm charging with 8 A / 230V and previously had a 2kW display in the app, now (that is since the last update) 1kW. Teslamate and the car continue to show 2kW.

 

[Dani S]

It is as @UncleCreepy writes likely just a rounding error / change introduced with the last app update, I'm charging with 8 A / 230V and previously had a 2kW display in the app, now (that is since the last update) 1kW. Teslamate and the car continue to show 2kW.

Thanks so much guys!

 

[KenC]

It's probably something innocuous like the kWh is a calculated figure, and not actually read from the car as an api, so that the calculation is being rounded differently in the car vs the app.

 

[Dani S]

Thanks KenC

 

[sp8962]

It's probably something innocuous like the kWh is a calculated figure, and not actually read from the car as an api, so that the calculation is being rounded differently in the car vs the app.

Assuming the app uses the public api State And Settings - Tesla API (why wouldn't it for this), there are multiple ways it could calculate/retrieve the current charging power level. As I noted Teslamate (uses the public API) gets it right (aka uses normal commercial rounding).

 

[BitJam]

Perhaps the car is reporting the power going into the car while the app is reporting the power going into the battery. This effect plus rounding could account for a 1Kw discrepancy.

 

[Dani S]

Probably a rounding thing like most said, its just really annoying knowing it was all fine and now with this discrepancy I don't have a real overview since my garage is not close to where I live. Thanks to everyone for their input, much appreciated!

 

[Aellinsar]

Watts = Volts * Amps, so the app is showing 13A x 223V = 2.899 kW and the car is showing 13A x 225V = 2.925 kW.

As others have said, I'd guess that he app truncates the decimals to get 2 and the car rounds to get 3.