# Tesla Wall Connector Energy usage sensor shows wrong consumption

Hi,

i have both, my Tesla Model 3 and my Tesla Wall Connector, integrated in HA. But i have one problem. The energy used to charge my car does not show right in Tesla Wall Conector sensor. The Wall Connector sensor shows 56,52 kWh and the sensor from the car shows 31,81 kWh.

I belive that the kWh from the Car sensor are right because the whole consumption of our house is 57,86 kWh and we need mor than 10 kWh daily for the whole house.

Would be nice if someone could help me.

@einarhauks

I’ve also noticed a difference between the Tesla Wall Connector integration kWh values and my Model 3 power usage in the app. It’s only off by a few KWhs, so I just assume it’s the fact that there’s a power loss in the charging process.

In your case, that’s one heck of a line loss! I bet your power company loves you!!

I tihink the Tesla Wall Connector Integration calculates the energy wrong, because if it was really 56,52 kWh, that would be almost my entire consumption of the whole house on one day.

I see gaps/jumps in energy usage like in picture below. Why?

I see exactly the same thing here, random jumps in energy count at moment the car was not plugged. It makes the integration useless.

Today was a good example how wrong the energy sensor from the Tesla Wall Connector intergration is.

I consumed 46,8 kWh from the Grid

And the energy sensor shows that it used 51,33 kWh

The Car shows it used 36,65 kWh

@einarhauks

Same here, one moment it showed the same value as shown in the car (23 kWh). The next moment it shows 102 kWh while according to my energy monitor I only consumed 50kWh. There might be a BUG there

I know that this is several months old, but did this issue go away for you? Also, just curious but is your circuit running to your Tesla Wall Charger running off of a 60A breaker where you’re getting the full capable 48A output that the TWC can provide? If, for instance, you were running off of a smaller circuit where the total energy provided in an hour is less, maybe the integration is trying to calculate off of the maximum output (48A) and that is where the problem is?

@Chris_K was 9 months earlier so very old thread. I’m running into this observation myself now so it’s a still a concern in 2024 even with the latest updates across HA components and wall connector firmware. Mine is only off by a few kW, but enough for me to search for an answer. Reading the comments above, it does suggest to trust the car’s ‘energy added’ over the WC’s integration measures. Anyone else find the opposite to trust the WC?

The issue is still active. I opened an Issue in GitHub here: Tesla Wall Connector's Energy Wrong Measurement (Random Spikes) · Issue #121590 · home-assistant/core · GitHub
But the developer doesn’t seem active, so I doubt it’ll be fixed.