Pre-heating function will drain battery?

[whitex]

it uses “shore power” to preheat the car if plugged in and a timer set for charging and preheating before you leave. So you can have a warm car when leaving in the morning and from work if power is available and timer set

What about non-timer related activation of the pre-heat? I don't have a regular driving schedule, I preheat my cars manually (both Teslas) whenever I need them pre-heated.

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[TaycanCook]

What about non-timer related activation of the pre-heat? I don't have a regular driving schedule, I preheat my cars manually (both Teslas) whenever I need them pre-heated.

If you leave it plugged in and it has hit the charge profile completion criteria, start pre cool/preheat, you will see that the car will start charging again. So it draws from the battery, but it will charge up to what the charge profile specifies.

 

[David Bennett]

What about non-timer related activation of the pre-heat? I don't have a regular driving schedule, I preheat my cars manually (both Teslas) whenever I need them pre-heated.

I just turned mine on manually while plugged in and the light went green

 

[TaycanCook]

I think this is correct. When mine is plugged, has finished charging and I activate pre heating, the charging light goes green again which must indicate it is drawing power for the heating (or keeping the battery at the target level)

No, keep an eye on the app, you will see that the battery starts charging again.

 

[whitex]

If you leave it plugged in and it has hit the charge profile completion criteria, start pre cool/preheat, you will see that the car will start charging again. So it draws from the battery, but it will charge up to what the charge profile specifies.

Battery cannot be charging and discharging at the same time. If the charging current is higher than the drawn current, then the battery is charging, if it's the same, battery is neither charging or discharging, if less, then the battery is discharging, but slower.

 

[whitex]

I just turned mine on manually while plugged in and the light went green

I don't suppose you can see the actual charge rate on whatever charger you are using. If the battery is at 100% or whatever the target is, the charger should turn off. If you then activate HVAC in the car, the charger turns back on but only at the rate the HVAC is drawing (2-3KW perhaps, so lower than during usual charging), or else the battery would start getting charged higher than the plan (or if it was 100%, there simply is no higher).

 

[Scandinavian]

What about non-timer related activation of the pre-heat? I don't have a regular driving schedule, I preheat my cars manually (both Teslas) whenever I need them pre-heated.

In my experience I have not seen it connect to “shore power” in your scenario. I am away without the car so cannot check that now.

Tesla certainly does connect that way, but I am not sure the Taycan does it? Would be nice if it did though. I also believe the Tesla preheats the battery at that stage.

 

[TaycanCook]

Battery cannot be charging and discharging at the same time. If the charging current is higher than the drawn current, then the battery is charging, if it's the same, battery is neither charging or discharging, if less, then the battery is discharging, but slower.

Test it your self and observe what the app is showing you.

 

[TaycanCook]

I don't suppose you can see the actual charge rate on whatever charger you are using. If the battery is at 100% or whatever the target is, the charger should turn off. If you then activate HVAC in the car, the charger turns back on but only at the rate the HVAC is drawing (2-3KW perhaps, so lower than during usual charging), or else the battery would start getting charged higher than the plan (or if it was 100%, there simply is no higher).

Test it, and you will observe max amperage draw as specified by the evse.

 

[Dee]

Does the Taycan use shore power for preheating when plugged-in? All Teslas do that, so pre-heat while plugged-in at home actually saves battery.

Yes.
If a timer/profile is active:
-If it's plugged in, it'll preheat the cabin AND the battery.
-If it's not plugged in, it'll only preheat the cabin.
Edit: after the uPdate it'll preheat the battery without being plugged in.

Not sure if it'll do the same if you only use the preheat/cool button (without a timer/profile active).
NB: an hour should be enough to preheat the battery and the cabin though...

Edit: Now that I think about it:
What has priority when the charge rate is not enough to reach the set charge level: charge level or preheat?

 

[David Bennett]

No, keep an eye on the app, you will see that the battery starts charging again.

Isn’t that after it times out? Right now I’ve got my message that it’s up to temperature and the charging light has gone out. I’m about to use the car so won’t be able to follow behaviour for any longer

 

[TaycanCook]

Isn’t that after it times out? Right now I’ve got my message that it’s up to temperature and the charging light has gone out. I’m about to use the car so won’t be able to follow behaviour for any longer

What is "it" times out? I've messed with this in 0c weather for nearly an hour to observe what the car does. Though, if my car is the only one that does this, I would not be surprised. Ive gone in for ana6 twice, both times "completed", both times came out with the old icons so I am never sure what was updated and not.

 

[Throb]

It makes me laugh that a SA thinks Porsche would go to the effort of building-in a function on the Taycan that is so bad for the car that you shouldn't use it.

 

[whitex]

Test it, and you will observe max amperage draw as specified by the evse.

I will, once Porsche hatches me a Taycan. Latest ETA, February 2023. So for now, asking members with cars to learn more about it.

 

[TaycanCook]

It makes me laugh that a SA thinks Porsche would go to the effort of building-in a function on the Taycan that is so bad for the car that you shouldn't use it.

You mean like the center console lid? I kid... I kid...

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