Battery capacity and range estimates

[Gary Gerrard]

I took a long trip (700 miles). Beforehand I planned stops using the Porsche trip planning function in Porsche Connect.
ISSUE ONE: I noticed right off that the first stop planned was farther away than the range with a full battery charge. Fortunately, I didn't just follow the planner.

ISSUE TWO: I was driving on the interstate at 80-85 mph. I noticed that as I drove the range decreased faster than the actual miles traveled. For every 10 miles of range, I was only traveling about 7-8 miles. I didn't notice this the first time until I only had about 40 miles to my next charging stop and only 45 miles of range left. I slowed to 60 mph and was able to make it to the stop with 11 miles of estimated range left. The bottom line, the range estimate and trip planner are badly out of sync and could result in being left on the side of the road with no charge.

ISSUE THREE: When driving 80-85 mph, I was getting 42.1-42.3 kWh/100 km per gauge. During the last 200 miles of the trip, on local roads and through small towns, I was driving between 55-75 mph with 38.9 Kwh/100 km per the gauge. Normally when driving around town before the trip, I was getting between 29.3-34.9 kWh/100 km per the gauge. Before the trip, I charged to 100% with an estimated range of 232 miles. (Temp. was in mid 30s F) Today, after the trip and a night's charge on a 240v home charger, I have 100% and 190 miles estimated range. That is only 76% of the rated range of 250, and 82% of what I got before starting the trip. During warmer weather in the 70s-90s, I was getting 232 miles with an 85% charge.

I know temp affects charge and therefore mileage, but is this normal for the temp variation I have experienced?
The car is a 2021 Turbo with 93.4 Kw capacity battery and now 13400 miles. Could the battery be deteriorating this fast?
Is the software defective in not accurately predicting miles to stops versus range and accurately giving mileage estimates versus discharge rate?

I hate to think I have an expensive commuter.

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[Jasper4S]

Every ICE and EV car has wrong estimations. The estimation is “best case scenario”. You drove 80mph, so not best case scenario. And not according to legal limits. You can’t expect the car to know or suggest or predict you are going over speed limit. The navigation is smart enough to adjust charge stops, so what was really the issue?

Also, it is a Porsche ? Of course it consumes more than expected

 

[Gru]

ISSUE THREE: When driving 80-85 mph, I was getting 42.1-42.3 kWh/100 km per gauge. During the last 200 miles of the trip, on local roads and through small towns, I was driving between 55-75 mph with 38.9 Kwh/100 km per the gauge. Normally when driving around town before the trip, I was getting between 29.3-34.9 kWh/100 km per the gauge. Before the trip, I charged to 100% with an estimated range of 232 miles. (Temp. was in mid 30s F) Today, after the trip and a night's charge on a 240v home charger, I have 100% and 190 miles estimated range. That is only 76% of the rated range of 250, and 82% of what I got before starting the trip. During warmer weather in the 70s-90s, I was getting 232 miles with an 85% charge.

I know temp affects charge and therefore mileage, but is this normal for the temp variation I have experienced?
The car is a 2021 Turbo with 93.4 Kw capacity battery and now 13400 miles. Could the battery be deteriorating this fast?

42 kWh/100 km ? i find it quite high for that speed on highway. I never exceeded 30 kWh/100 km at similar speeds on long distances, even in winter.

Unless weather was really bad (rain ? wind ?), or a roof box ? 21" with winter tires ?

 

[Gru]

You drove 80mph, so not best case scenario. And not according to legal limits. You can’t expect the car to know or suggest or predict you are going over speed limit.

I am not so sure. For instance in range mode, the max. speed would first be limited to 130 km/h to reach the next charging station I specified, but would raise to 140 or 150 (so above speed limit) if I consume less than expected

 

[Jasper4S]

I am not so sure. For instance in range mode, the max. speed would first be limited to 130 km/h to reach the next charging station I specified, but would raise to 140 or 150 (so above speed limit) if I consume less than expected

That scenario only occurs when the car knows that you can reach the destination wit a heavy right foot.

 

[Scandinavian]

@Gru


Maybe there is a mix up by OP between miles and km?? I guess he meant kWh/100 miles??

Your consumption at 130 km/h is the same as OP more or less??

 

[Scandinavian]

I took a long trip (700 miles). Beforehand I planned stops using the Porsche trip planning function in Porsche Connect.
ISSUE ONE: I noticed right off that the first stop planned was farther away than the range with a full battery charge. Fortunately, I didn't just follow the planner.

I guess this was the trip planner on the web or app? I have the same, it is totally out of sync with teality. What did your car show in the PCM? The charge planner in the car is normally quite accurate given that you stick to the legal speed limits.

ISSUE TWO: I was driving on the interstate at 80-85 mph. I noticed that as I drove the range decreased faster than the actual miles traveled. For every 10 miles of range, I was only traveling about 7-8 miles.

What was the official speed limit since I do not think the US has free speed on interstates??

As stated in another post, the charge planner can not know that you are driving at speeds that are diffferent from the legsl limits? How could it?

And disregard that GOM range. The main thing is to plan the trip in the car and you will find that the estimates on SoC at destinations,charger or final destination will be surprisingly accurate. If you stick to speed limits of course.

If you go faster or slower the SoC at destination will adjust. So say speed limit is 60 mph and you travel at 75 mph. The original Soc might have indicated something like 30% at destination. But going faster may reduce that to a lower level perhaps down to 15%. If you then set a minimum charge level at your destination of 25%, the charging planner will show you an extra charging stop. Quite useful if the weather turns sour with high wind and perhaps rain and wet roads.

 

[Tooney]

Here is a link to some good forum threads about trip planning: https://www.taycanforum.com/forum/threads/first-long-distance-trip-range.15861/#post-243197

Re some of your specific points:
--Using the nav unit in the PCM to plan routes and charging stops is better than the planner in Porsche Connect.
--For trips of 700+ miles, I plan manually prior to the trip using the EA charging site map and google maps. Others here use A Better Route Planner app.
--The range information shown on instrument panel and center console varies depending on several factors. It is referred to as the guess-o-meter, GOM. The estimates of destination SoC shown by the car's navigation system during a trip are accurate and reliable, in my opinion.

Road trip planning for a Taycan takes time to get right. Read the threads linked above. Good luck.

 

[Gary Gerrard]

Every ICE and EV car has wrong estimations. The estimation is “best case scenario”. You drove 80mph, so not best case scenario. And not according to legal limits. You can’t expect the car to know or suggest or predict you are going over speed limit. The navigation is smart enough to adjust charge stops, so what was really the issue?

Also, it is a Porsche ? Of course it consumes more than expected

Seriously? Porsche makes and advertises a car that has a max speed of 160 mph and they don't expect or design for going over the speed limit. You are kidding? They don't intend for their cars to crash either, but they install airbags and seat belts. Besides, if I was only doing the speed limit, I would have been run over by 99% of the cars on the road.

 

[Gary Gerrard]

42 kWh/100 km ? i find it quite high for that speed on highway. I never exceeded 30 kWh/100 km at similar speeds on long distances, even in winter.

Unless weather was really bad (rain ? wind ?), or a roof box ? 21" with winter tires ?

None of the items you mentioned, but it does have 21" wheels.

 

[Gary Gerrard]

Maybe there is a mix up by OP between miles and km?? I guess he meant kWh/100 miles??

Your consumption at 130 km/h is the same as OP more or less??

CORRECT. Should be Kwh/100 MILES

 

[Jasper4S]

Seriously? Porsche makes and advertises a car that has a max speed of 160 mph and they don't expect or design for going over the speed limit. You are kidding? They don't intend for their cars to crash either, but they install airbags and seat belts. Besides, if I was only doing the speed limit, I would have been run over by 99% of the cars on the road.

Why am I kidding? You consumed more than predicted because you drove faster than legally allowed. What do you expect from Porsche? That they always underestimate range because you might drive faster than allowed? I think this forum would be full with complaints that everyone arrived 20mins too early because they didn’t need a 2nd or 3rd charging stop.

 

[Jrkennedy37]

Headwind or tailwind can have a dramatic effect too.

For what it’s worth, the cars trip planner has been spot on for me, +/- 2% for short and long distances. I’ve also experienced crazy winds that severely impact the range and I will go slower (or faster in the case of a tailwind) to stretch the cars range to reach a further destination or charger.

 

[WasserGKuehlt]

OP, none of the issues you reported are really that (issues). As the others said, planning assumes speed limits (+/-), and the GOM is frightfully accurate IME. Also, under 80mph seems to be the sweet spot for total trip time (travel + charging) for longer trips; over 80 efficiency seems to drop really fast. (Unless, you know, you’re traveling downhill.)

The range estimate varies with the most recent trips; mine always goes down after longer trips, and recovers slowly with the daily commute.

 

[Mamba_Green]

42 kWh/100 km ? i find it quite high for that speed on highway. I never exceeded 30 kWh/100 km at similar speeds on long distances, even in winter.

Unless weather was really bad (rain ? wind ?), or a roof box ? 21" with winter tires ?

42 kWh per hundred miles, not kilometers. ??

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