Pre-heat Battery?

[Domy69]

Hello everybody! I receive my CT 4S in 1 month and I am of course excited since my order 9 months ago! Thanks for all the good topics on this Taycan’s lovers forum

I wonder if the pre-heat option only conditions the cabin or if it also conditions the battery in winter temperatures? Maybe there is a special command in the PCM to setup the preheating of battery??

My second question (depend of the answer of the first ) is to know if it is not better to charge 1 hour before departure in winter to heat the battery when the car is on the wallbox instead to lose energy only for preheat..?

I am absolutely not afraid by the regular autonomy of the Taycan..only on winter conditions I think we have to optimise it!!

Thanks for your experiences !

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[Speuk]

The pre conditioning function heats the cabin, heated seats and steering wheel, you can programme driver, passenger areas as well as front and rear areas. Yes it also heats the battery a little too. In my experience it will increase the battery temperature by approximately 12°C if ambient external temp is say 2°C so not really up to ideal operating temperature but it will certainly help on very cold days

 

[Raphie]

A pre heat cycle also takes 2% range, so do it for comfort, not range.

 

[Speuk]

A pre heat cycle also takes 2% range, so do it for comfort, not range.

Good point. I set mine with the Timer so pre heats while plugged in and charging so doesn't deplete range

 

[Bognar67]

According to my experience, the best way to preheat the battery is using a timer function for charging. On this way in my 12C garage the battery goes up to 22-24C using a 11kW charger. This way decreases my consumption a lot.

 

[whitex]

A pre heat cycle also takes 2% range, so do it for comfort, not range.

Even if the car is plugged in?

 

[f1eng]

It only needs about 10 minutes preheating to warm the cabin but the standard timer is one hour, which is presumably how long it takes to heat 600kg of battery rather than a handfull of kg of leather and air.
IME the big gain in winter is performance, the accetelration with a cold battery being obviously inferior to that with a cold battery.

It does deplete the battery but when charging the battery the system warms it quite a bit too, probably to help charging efficiency.

My strategy, on days when I know I am going somewhere is to time the charging needed to finish at my leaving time and initiate the preheat from My Porsche app about 10 minutes before leaving.

It may be what the timer function does anyway but I don't use that since I don't have a daily routine.

Heating that mass of battery obviously takes a lot of power since during preheat the percentage battery goes down even when plugged in receiving 7kW.

 

[W1NGE]

Hello everybody! I receive my CT 4S in 1 month and I am of course excited since my order 9 months ago! Thanks for all the good topics on this Taycan’s lovers forum

I wonder if the pre-heat option only conditions the cabin or if it also conditions the battery in winter temperatures? Maybe there is a special command in the PCM to setup the preheating of battery??

My second question (depend of the answer of the first ) is to know if it is not better to charge 1 hour before departure in winter to heat the battery when the car is on the wallbox instead to lose energy only for preheat..?

I am absolutely not afraid by the regular autonomy of the Taycan..only on winter conditions I think we have to optimise it!!

Thanks for your experiences !

As others have mentioned:

- preheat (or cool) function is primarily for cabin comfort and not battery warming or preconditioning. AC charging in general does not generate sufficient battery heat to accelerate battery charging.

- preconditioning of the battery is managed via the Navigation and when Porsche Charging Planner is active. Selecting a DC charging location which is >= 50 kW as a destination or stopover will automatically precondition the battery and heat to around 32C for optimum charging speed and time.

- preheat control is via the My Porsche App or PCM.

- preheat can be programmed or initiated on demand

 

[whitex]

My strategy, on days when I know I am going somewhere is to time the charging needed to finish at my leaving time and initiate the preheat from My Porsche app about 10 minutes before leaving.

I've been doing something similar with my Teslas for years. 19.2KW charging also helps the battery warm up quicker (higher charge rate, higher losses and therefore heat generation). I don't time the charging, but instead just raise the desired percentage 30-45 minutes before I leave and turn on pre-heating 10 minutes prior, unless the car it outside covered in ICE, then I preheat longer. Tesla also heats the cabin from "shore power" rather than the battery, if plugged in.

That said, the quickest way to warm a battery, at least on a Tesla, is to do some rapid accelerations - no amount of charging, even at 20KW, gets the battery as warm. On trips where my battery would get soaked overnight and I needed a charge in the morning, I would drive one exit down a highway and back up just to warm up the battery before charging. Cold soaked battery charges really slow, even at DC chargers (I've seen as low as 3KW).

 

[Domy69]

According to my experience, the best way to preheat the battery is using a timer function for charging. On this way in my 12C garage the battery goes up to 22-24C using a 11kW charger. This way decreases my consumption a lot.

How long does it take you to reach 22-24C from 12C?

If the constraint of remaining km is not a problem, I wonder what is the most optimal in terms of electrical consumption

 

[Bao1303]

Pretty new to the car and only put abt. 1000km on it and if I understand correctly, consumption improves once "broken in". But did an unscientific test last week. Took a roundtrip of 120km each way. It was consistently between -13 and -18C during this trip and the elevation same at point A and B. (lots of hills inbetween).

Prior to first stretch, A to B car timed and pre warmed in the garage, charge 100%.

On return B-A the car was left in the cold for 5 hours, just had a quick cabin preheat, not hooked up)

Surprised me to see co sumption was more or less identical, and my avg. Speed actually higher on the return (abt. 31kW/100km). Also did the same trip with temp. Abt. 0C, and consumption was abt. 26kw/100km so roughly 16%range decrease from 0 to - 15C. Both times I saw just insignificant effect of preheating.

Not scientific this but must say I expected to see a marked difference in consumption between trip / return

Btw. For those with some more mileage, how much improvement to expect once "broken in"?

 

[Scandinavian]

It only needs about 10 minutes preheating to warm the cabin but the standard timer is one hour, which is presumably how long it takes to heat 600kg of battery rather than a handfull of kg of leather and air.
IME the big gain in winter is performance, the accetelration with a cold battery being obviously inferior to that with a cold battery.

It does deplete the battery but when charging the battery the system warms it quite a bit too, probably to help charging efficiency.

My strategy, on days when I know I am going somewhere is to time the charging needed to finish at my leaving time and initiate the preheat from My Porsche app about 10 minutes before leaving.

It may be what the timer function does anyway but I don't use that since I don't have a daily routine.

Heating that mass of battery obviously takes a lot of power since during preheat the percentage battery goes down even when plugged in receiving 7kW.

Try to set a timer for when you plan to leave on the PCM. But also set it to preheat at the same departure time. No special with the app needed in such case.

I did that the other day when the battery was at 2 degrees C in the morning, plugged in and set timer for both battery charging and preheating. Only needed about 30% so the 3.5 hours at 11 kW would be enough.

Car charged to desired level (actually 2 % above) and battery warmed to 22 degrees C. The drive after that only consumed 22 kWh/100 km in about 7-9 degrees C. So it does help a lot to schedule charging and preheating at the same time

I charge with my PMCC so I can also see the charge power over time.

 

[Bao1303]

I should add to my prev. Post that for the cold run (-15) battery temp was +18 after preheat at start, and somewhere below 0 when returning. I forgot to check battery temp at start from B, but was abt 0 after a few km. Seems that big battery lump is a proper heat sink, I would asume a much greater difference if the temp was actually - 15, still positively surprised - not about the absolute range, but for the relatively predictable range variation. Also must say the PCM predicted range was spot on. Given my short milage this was probably just pure luck, but anyway...

 

[Bognar67]

How long does it take you to reach 22-24C from 12C?

If the constraint of remaining km is not a problem, I wonder what is the most optimal in terms of electrical consumption

Today I charged from 45% to 85%. Ambient temp was 12C starting battery temp 25C. Traveled 110km at 3C and was kept this 25C. I would say 3-4 hours of 11kW charging is necessary.

 

[W1NGE]

Pretty new to the car and only put abt. 1000km on it and if I understand correctly, consumption improves once "broken in". But did an unscientific test last week. Took a roundtrip of 120km each way. It was consistently between -13 and -18C during this trip and the elevation same at point A and B. (lots of hills inbetween).

Prior to first stretch, A to B car timed and pre warmed in the garage, charge 100%.

On return B-A the car was left in the cold for 5 hours, just had a quick cabin preheat, not hooked up)

Surprised me to see co sumption was more or less identical, and my avg. Speed actually higher on the return (abt. 31kW/100km). Also did the same trip with temp. Abt. 0C, and consumption was abt. 26kw/100km so roughly 16%range decrease from 0 to - 15C. Both times I saw just insignificant effect of preheating.

Not scientific this but must say I expected to see a marked difference in consumption between trip / return

Btw. For those with some more mileage, how much improvement to expect once "broken in"?

Depends really but you should expect to see an estimate of 250 or so miles come the summer and a few more miles. Don't expect to see WLTP or EPA ranges reported.

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