371 miles!

[hammersmith]

A couple of weeks ago I charged my Macan4 to 100%. The range went up beyond the spec to 371! How was this possible?

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[PrudentOcean]

It all depends on where and how you drive. My driving is mostly low speed city and some moderate speed highway driving, where consumption is less than what is used in the EPA range tests. For me that results in about 340 miles of estimated range.

 

[dbsb3233]

A couple of weeks ago I charged my Macan4 to 100%. The range went up beyond the spec to 371! How was this possible?

Because it's projected range, not real range. That's why such range displays are affectionately referred to as GOMs (Guess-O-Meters).

They tend to use the mileage from recent miles driven and extrapolate that for the remaining (usable) battery. The car has 95 kWh usable. 371 / 95 = 3.9 mi/kWh. So you must have averaged 3.9 in recent drives (probably slow speed city driving).

If you hit the highway at 75 MPH, you won't get anywhere close to that mileage or range though. So it can be pretty deceiving.

 

[craz8]

I have an inkling that the GOM calculation doesn't work well at all for 100% charge.

Lithium battery voltage changes based on state of charge, and the battery management uses the measured voltage to calculate the state of charge, and from that the range to display in the GOM

However, this voltage change isn't linear at high or low states of charge - below 10% and above 90% - and I think our car's don't handle this well.

What this means is that 100% charge can cause the calculation to think there is more milage in the battery than is actually there. What you'll see is that you've lost a lot of displayed range very quickly from 100%, that will settle down at some point to the actual usage. eg your first 5 miles will 'lose' 30 miles of range.

As an example, if I charge to 75%, and calculate what the 100% should be, I get about 300-310 miles. If I then actually charge to 100%, it will show 340-360 miles of range. That 30-60 miles of 'extra range' doesn't exist and is an artifact of the calculation process at high state of charge.

 

[FLHusky]

Excellent explanation!!​

 

[sloubere]

I have an inkling that the GOM calculation doesn't work well at all for 100% charge.

Lithium battery voltage changes based on state of charge, and the battery management uses the measured voltage to calculate the state of charge, and from that the range to display in the GOM

However, this voltage change isn't linear at high or low states of charge - below 10% and above 90% - and I think our car's don't handle this well.

What this means is that 100% charge can cause the calculation to think there is more milage in the battery than is actually there. What you'll see is that you've lost a lot of displayed range very quickly from 100%, that will settle down at some point to the actual usage. eg your first 5 miles will 'lose' 30 miles of range.

As an example, if I charge to 75%, and calculate what the 100% should be, I get about 300-310 miles. If I then actually charge to 100%, it will show 340-360 miles of range. That 30-60 miles of 'extra range' doesn't exist and is an artifact of the calculation process at high state of charge.

I have an inkling that the GOM calculation doesn't work well at all for 100% charge.

Lithium battery voltage changes based on state of charge, and the battery management uses the measured voltage to calculate the state of charge, and from that the range to display in the GOM

However, this voltage change isn't linear at high or low states of charge - below 10% and above 90% - and I think our car's don't handle this well.

What this means is that 100% charge can cause the calculation to think there is more milage in the battery than is actually there. What you'll see is that you've lost a lot of displayed range very quickly from 100%, that will settle down at some point to the actual usage. eg your first 5 miles will 'lose' 30 miles of range.

As an example, if I charge to 75%, and calculate what the 100% should be, I get about 300-310 miles. If I then actually charge to 100%, it will show 340-360 miles of range. That 30-60 miles of 'extra range' doesn't exist and is an artifact of the calculation process at high state of charge.

I’d argue that the onboard calculator knows very well it is not linear and factors this into the calculation anyway.

 

[Bruyne]

I get 310 miles with 22” spider wheels. Happy with this range…

 

[dbsb3233]

I get 310 miles with 22” spider wheels. Happy with this range…

Get 310 actual miles driven, or get 310 displayed on the GOM?

 

[Bruyne]

Driven. But I drive normally. No crazy things.

 

[alvaro]

Someone is gonna be very disappointed come winter…

 

[Fun TC Driving]

Someone is gonna be very disappointed come winter…

Not if we plan ahead, then estimate around 220 to 240 miles based on temp, whether it is raining, etc. As we all know, first plan, then adjust and adapt.

 

[Bruyne]

Not if we plan ahead, then estimate around 220 to 240 miles based on temp, whether it is raining, etc. As we all know, first plan, then adjust and adapt.

Moreover, with the 20 “ wheels in winter the loss in mileage will be compensated for a part. But I know that there will be a decrease of 20%, I am ok with that.

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