VW ElectricGate

[egolfEr]

I have been noticing that my 2016 eGolf is not really reporting the mi/kw correctly. It feels like it is inflating the numbers. Recently, I charged the battery completely. I then proceeded to drive 28 miles. My batter gauge was showing that I had used (5 out of 16 bars on battery gauge) 31.25% of the battery.

24.2 kw battery x 31.25% = 7.5625 Kw used

28 mi / 7.5625 kwh = 3.70 mi/Kwh. The car is reporting I am getting 4.4 mi / Kwh

Anyone else seeing these anomalies?

 

[forbin404]

1) Did you use from Charged?

2) Did you allow I think it's 2 hours between tests?

There's a weird thing on the display that if you stop the car, do something short time, and go, it will merge the two times together.

 

[f1geek]

Nothing is wrong. The fuel gauge shows net capacity, not gross capacity. Since the maximum net capacity is 85.33%, at full, your battery has 20.65 kWh of energy.

20.65 kWh* 0.3125=6.453 kWh used

28/6.453=4.33 miles/kWh

The car's estimate of 4.4 miles/kWh is correct as this calculation has some sloppiness due to the lack of precision on the max net capacity and % used.

 

[Verkehr]

What f1geek said.

ElectricGate: averted :shock:

 

[egolfEr]

Thank you for the math help. Yes, I now recall not all of the 24.2kw was usable.

I remember it was closer to 22kw, and not 20.x. Is there any documentation on this posted elsewhere?

 

[f1geek]

Good point. It’s hard to be sure of the real net capacity, but that’s my best guess based on all the information I’ve seen. Also, I was told by VW Customer Care that the starting net capacity, for warranty claims, is 64 Ah, but this was only over the telephone (Thus, 64/75=0.853 starting net capacity). I have been unable to find this number documented anywhere. If our cars had a 50 or 60 kWh battery pack, the difference of a few kWh would hardly matter. Of course, to us, a few kWh is pretty significant.