Preconditioning & charging planner

[Yves]

thats all ok. but i do not understand: „I DC charge to 70% and charge the car to 100% on AC, it is outside so if I do none of that my battery is very cold“
you go to a fastcharger, charge to 70% than drive home, park on the street and charge to 100% with AC? this would not make much sense.
anyways when you leave with 100%, use the charging planner, you will have a perfect battery temp for your next charging 3 hours later.
the point exactly is that this is very complicated and not very significant at the same time.
thats why porsche researched this for many years now und came to conclusions. oneof this conclusions must be that we get better results if the cars computer calculates whats most efficient.

Correct, the AC charging will keep the battery from loosing all the heat generated during the DC charge, it will not heat the battery, just slows the cooling …

I have 3 DC charge stations all very close to home, like one is at less then a mile out …
As you have seen I advised other people to skip this, I like to get 100% efficiency, others can ignore or adapt to it …

If all goes well I will do the trip to the south of France with the Macan in colder conditions and I can report back on my charging time.
2 years ago with the iX it was not that great, used Apple Maps / BMW nav and the iX had no manual pre heating so I ended up 1h45 minutes charging …
If I can keep it under 1 hour this time, I’ll be happy …

The BMW App gives Charging time 1h8min and 3 stops
The Porsche App gives 54min and 4 stops …

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[CHP]

so what ?


In any case, this assumption cannot be stated as such. This whole discussion is only about a few minutes more or less. But to prove this "scientifically," the following test setup would have to be chosen:

Departure at outside temperature X, with charge level Y, distance to charging station Z. (Must be the same for all tests) Once with Porsche Charging Planner, once without. And once with "sport plus" (preconditioning is ALWAYS "on" here).

This should be repeated 10 times. I would be very grateful to @Yves for conducting this experiment. Until then, I would be very happy if this unnecessary discussion would end.

The central question here, which nobody can answer reliably: Energy consumption of heating the battery versus gain in charging speed with a warm Battery.

My Porsche Guy told me that porsche decided that its not worth it.

I think the main point is to reduce trip duration under very specific circumstances. Porsche states
by the time you reach the charging station, the battery will be within the optimal temperature range, allowing you to charge at maximum speed.

Except:

1) Batteries perform best within a moderate temperature range. Extreme cold or heat slows the chemical reactions within the battery, which temporarily reduces its efficiency and available power.

From Porsche: In very cold Sport Plus mode, the battery might need more power than a cold battery can give, triggering a temporary power limit.


2) A cold battery will limit its charging rate to avoid damage, significantly increasing the time spent at a charging station.

From Porsche: Use the app to schedule preheating/precooling while plugged in to maximize range and cabin comfort.

3) Consistently operating a battery outside its ideal temperature range (e.g., fast charging when cold or overheating) can cause chemical stress and accelerate degradation over time.

From Porsche: Avoid parking in direct sunlight for prolonged periods in ambient temperatures over 30°C to maximize battery life.


So yes, Porsche is very well aware of certain circumstances where preconditioning before starting your trip may be beneficial. Yves kindly provided personal experience to reduce charging and trip duration time. This is what the forum is all about.

 

[Yves]

I think the main point is to reduce trip duration under very specific circumstances. Porsche states
by the time you reach the charging station, the battery will be within the optimal temperature range, allowing you to charge at maximum speed.

Except:

1) Batteries perform best within a moderate temperature range. Extreme cold or heat slows the chemical reactions within the battery, which temporarily reduces its efficiency and available power.

From Porsche: In very cold Sport Plus mode, the battery might need more power than a cold battery can give, triggering a temporary power limit.


2) A cold battery will limit its charging rate to avoid damage, significantly increasing the time spent at a charging station.

From Porsche: Use the app to schedule preheating/precooling while plugged in to maximize range and cabin comfort.

3) Consistently operating a battery outside its ideal temperature range (e.g., fast charging when cold or overheating) can cause chemical stress and accelerate degradation over time.

From Porsche: Avoid parking in direct sunlight for prolonged periods in ambient temperatures over 30°C to maximize battery life.


So yes, Porsche is very well aware of certain circumstances where preconditioning before starting your trip may be beneficial. Yves kindly provided personal experience to reduce charging and trip duration time. This is what the forum is all about.

Exactly and I’m even running the risk of degrading my battery, as DC charging a battery at less then ideal temperature will degrade battery health. So the key takeaway, make sure your battery is always pre conditioned, you charge faster and you put less strain on the battery, something we did not talk about but is important, and which I neglected / took not enough into consideration as an argument to always Pre heat / Cool the battery …

 

[TomekGnomek]

Exactly and I’m even running the risk of degrading my battery, as DC charging a battery at less then ideal temperature will degrade battery health.

I think this is a myth. Car handles DC charging very well in extreme conditions, when you fast charge it during a very hot summer day with the car standing under the sun it just lowers the charging speed so the battery does not overheat and this prevents degradation. I wouldn't worry about that.

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