Will my Taycan pre-heat the battery based on "A Better Routeplanner" charging stops?

[Gru]

I'll consider the two cases: summer (hot) and winter (cold).

In summer, having the charging stop in PCM triggers the thermal management of the battery. In the graph below (battery temp. on the top graph), PCM warms the battery from 30° to 35° about 30mn before the charging stop. It doesn't need the heater (3rd graph): it's hot outside, the heat generated by the power train/battery is enough to raise from 30° to 35° and reach the optimal temp. for fast charging (250 kW).

In winter, it'll need the heater (not displayed below). The 3 cases below are similar in term of driving conditions (ie after driving about 250 km, same locations start/stop). Left is without charging stop in PCM, center with charging stop in PCM and preserve battery, right with charging stop in PCM and no preservation of battery.

That was 3 different trips, i couldn't reproduce the exact same external condition (obviously...), neither exact similar SoC at stop. My driving style was quite similar.

- without PCM stop (left) so no preheat, batt. temp. reached 24°, 33° when preheating (using heater) in the other 2 trips (center and left)
- no preheat (left): DC charging stalled near 150kW although batt. temp increased to 35°. But at that time SoC was already at 50%, too late to increase to 250 kW. When SoC reached 60%, it went down to 100 kW
- preserve batt. (center): charging went down to 200 kW before 40%, when it stayed above 200 kW until 55% on the right.

If you compare the time to go from 20% to 75%, it goes from 23' (left) to 14'30" (middle) to 13' (right). Quite negligible on a 10hrs trip, but as said above, I also don't like to wait ...

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[Gru]

So to me it’s a CarPlay issue and not Porsche but I can’t reproduce it anymore.

same issue on Android auto.
There is somewhere a parameter "Nav running on phone" that needs to be set to 0 .... Tomtom seems to forget to update it.
I've another app that allows mirroring the phone on the PCM, where there is a parameter "set speed to 0" so it'll display whatever is on the phone even though car is moving.

 

[daveo4EV]

I'll consider the two cases: summer (hot) and winter (cold).

In summer, having the charging stop in PCM triggers the thermal management of the battery. In the graph below (battery temp. on the top graph), PCM warms the battery from 30° to 35° about 30mn before the charging stop. It doesn't need the heater (3rd graph): it's hot outside, the heat generated by the power train/battery is enough to raise from 30° to 35° and reach the optimal temp. for fast charging (250 kW).

In winter, it'll need the heater (not displayed below). The 3 cases below are similar in term of driving conditions (ie after driving about 250 km, same locations start/stop). Left is without charging stop in PCM, center with charging stop in PCM and preserve battery, right with charging stop in PCM and no preservation of battery.

That was 3 different trips, i couldn't reproduce the exact same external condition (obviously...), neither exact similar SoC at stop. My driving style was quite similar.

- without PCM stop (left) so no preheat, batt. temp. reached 24°, 33° when preheating (using heater)
- no preheat (left): DC charging stalled near 150kW although batt. temp increased to 35°. But at that time SoC was already at 50%, too late to increase to 250 kW. When SoC reached 60%, it went down to 100 kW
- preserve batt. (center): charging went down to 200 kW before 40%, when it stayed above 200 kW until 55% on the right.

If you compare the time to go from 20% to 75%, it goes from 23' (left) to 14'30" (middle) to 13' (right). Quite negligible on a 10hrs trip, but as said above, I also don't like to wait ...

amazing data - thank you for sharing!!! I 100% love actual data!! Thank you!

 

[Gru]

as a rule of thumb, batt. temp. will reach (T outside + 15°C) in about 1h30 / 2h00 if no heater.
BMS will keep it around 30°/32° max.

All these data are with Normal driving mode. Sport Plus may increase the 30°/32° limit. To be checked when spring is back ?

	1st graph	2nd graph	3rd graph	4th graph
T outside	5°	10°	16°	22°
T battery	19°	24°	31°	32°

 

[Gru]

amazing data - thank you for sharing!!! I 100% love actual data!! Thank you!

I wish I had 3 identical cars to run these tests in the exact same conditions ?

 

[ze_shark]

How do you capture these logs ? They are awesome !

 

[Gru]

How do you capture these logs ? They are awesome !

i use Car scanner with an OBD dongle.

these plots come from the app, where you can select the data to represent, and zoom on X / Y axis

https://www.taycanforum.com/forum/threads/obdii-dongles-list-your-brand.15912/

 

[Administrator]

Changed J1.2 references to J1.2 (refresh/facelift model).

 

[mjoe]

My dealer told me 2 years ago during a test drive that the battery pre-conditions at sport plus mode. But I heard already that this might not be true..

Is it possible to find the preheat flag though OBD2 and carscanner?

 

[Gru]

My dealer told me 2 years ago during a test drive that the battery pre-conditions at sport plus mode. But I heard already that this might not be true..

i would rather say that the temperature management is different, but not by much.

Below a comparison between 2 trips, one under Sport+ , one with Range mode. 2 hrs drive on highway, at a constant speed around 70/75 mph, with a quite similar outside temperature (3 ° / 5°), and no Navigation in PCM, so no preconditioning.

Yes, the T° batt is 6° higher in Sport + ... but only after 2 hrs, and still not high enough : DC charging couldn't go more than 150kW

 

[SergeyIndy]

@mjoe, my question is why anyone would ever listen to a dealer.

You can see your battery temperature as well when driving so you can verify yourself if battery temperature is increasing, but expect it to pre-condition for DC charging levels in any mode is definitely a no. The only advice that I heard of is to yo-yo the car to preheat the battery as quickly as possible in the most aggressive mode (Sport/Sport+) if the trip to the DC charger is short, but I have no interest in testing that theory.

 

[mjoe]

For my defense, it was the technical guy and not the sales rep..

thank for the data to bust the myth!

 

[anonymouse]

I use ABRP for planning and just stick the next stop into the PCM nav. Less human energy expended than all this stress about preheating

Having said that, often the PCM doesn’t actually start preheating anyway, even when the destination is clearly a DC charger. Usual unpredictable Porsche software.

 

[Gru]

often the PCM doesn’t actually start preheating anyway, even when the destination is clearly a DC charger. Usual unpredictable Porsche software.

you should set the DC charger destination, then select "find a charger nearby", it'll give you a list and from that list select the charger. and confirm you want to add it to your trip.
your final destination should also be known by the Nav.

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