Why does manual pre-conditioning not use shore power?

[whitex]

When the car is plugged into an EVSE, and I select manual pre-heat, the car will draw power from the HV battery. When I create a timer to get the car ready in 5 minutes, the car will use shore power (power from EVSE, not battery). Using the battery puts unnecessary wear on the battery (each battery is rated in number of complete charge-discharge cycles, though recently there have been studies that shallow charging actually wears the battery less as it caused less cracking in the lithium crystal structures due to less total expansion during charge-discharge cycles).

Anyone know why Porsche will not use shore power when manually pre-conditioning, but will use it when a time is set to do the same?

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[Ross]

When the car is plugged into an EVSE, and I select manual pre-heat, the car will draw power from the HV battery. When I create a timer to get the car ready in 5 minutes, the car will use shore power (power from EVSE, not battery). Using the battery puts unnecessary wear on the battery (each battery is rated in number of complete charge-discharge cycles, though recently there have been studies that shallow charging actually wears the battery less as it caused less cracking in the lithium crystal structures due to less total expansion during charge-discharge cycles).

Anyone know why Porsche will not use shore power when manually pre-conditioning, but will use it when a time is set to do the same?

Mine definitely uses mains power on manual pre conditioning. You can see the green light pulsing at 8am even if it reached its set charge at 5am with cheap night rate electricity.
I never set a timer to pre heat as it irritates me when I forget to cancel it and it preheats when not necessary which is a total waste of energy.
If I have used the app to preheat on a cold morning the charge % is unchanged when I get in.
If I am not plugged in and it’s cold the battery can lose 5%!

That’s UK. GTS saloon MY22. Porsche charging unit.

 

[Scandinavian]

Mine definitely uses mains power on manual pre conditioning. You can see the green light pulsing at 8am even if it reached its set charge at 5am with cheap night rate electricity.
I never set a timer to pre heat as it irritates me when I forget to cancel it and it preheats when not necessary which is a total waste of energy.
If I have used the app to preheat on a cold morning the charge % is unchanged when I get in.
If I am not plugged in and it’s cold the battery can lose 5%!

That’s UK. GTS saloon MY22. Porsche charging unit.

That is an interesting observation.

I think I have tried all combinations to achieve taking shore power for pre heat (-cool) but never succeeded. MY20 Turbo.

Only way has been to use a timer for charging.

Can you share your car charging settings and how you have achieved taking shore power?

 

[whitex]

That is an interesting observation.

I think I have tried all combinations to achieve taking shore power for pre heat (-cool) but never succeeded. MY20 Turbo.

Only way has been to use a timer for charging.

Can you share your car charging settings and how you have achieved taking shore power?

I set this timer in the app, works even if I set it only 5 minutes later. Under Vehicle->Functions->Preheat/Precool. I know it's not charging, since the car was plugged in and already reached 85% before, but also because I can see it only draws less than 10KW while it would draw 19.2KW when charging.

 

[whitex]

Mine definitely uses mains power on manual pre conditioning. You can see the green light pulsing at 8am even if it reached its set charge at 5am with cheap night rate electricity.
I never set a timer to pre heat as it irritates me when I forget to cancel it and it preheats when not necessary which is a total waste of energy.
If I have used the app to preheat on a cold morning the charge % is unchanged when I get in.
If I am not plugged in and it’s cold the battery can lose 5%!

That’s UK. GTS saloon MY22. Porsche charging unit.

Interesting, mine never uses mains power on manual preconditioning (I have a light on the EVSE, also have home power monitor which records the usage). I don't have different rates for electricity, so always charge to 85% when plugged in, so by the time I preheat, the car is almost always at 85% already.

 

[simcity]

Shore power? Since when was a Taycan a boat? Perish the thought ?

 

[W1NGE]

When the car is plugged into an EVSE, and I select manual pre-heat, the car will draw power from the HV battery. When I create a timer to get the car ready in 5 minutes, the car will use shore power (power from EVSE, not battery). Using the battery puts unnecessary wear on the battery (each battery is rated in number of complete charge-discharge cycles, though recently there have been studies that shallow charging actually wears the battery less as it caused less cracking in the lithium crystal structures due to less total expansion during charge-discharge cycles).

Anyone know why Porsche will not use shore power when manually pre-conditioning, but will use it when a time is set to do the same?

I have the same issue which I think I commented on a while back on another post so last night I tried again.

I use Charge Anytime (OVO) app to manage the charging session (cheap rates) using my PMCC EVSE. This gives me no control of the preheat and so I have to use an additional timer in My Porsche. My feeling was that this would not work out and that the Charge Anytime timer / profile would ultimately conflict which my preheat only timer for an 07:30 departure.

Unfortunately I was correct and the car ended up charging until I stopped it (it was programmed to stop at 85% and be ready by 07:30 but because there was another timer in play it seems that this overrides. Perhaps I need to have my 'ready by setting' in Charge Anytime set much earlier than my actual departure time but long enough to charge the car (for which I would set a preheat timer for 07:30 whilst still connected to my EVSE to draw shore power). I'll maybe try that sequence next time around.

Aside from that, I'm back to my original thought that with my setup I can't rely on shore power for preheating the cabin nor can I have two controlling processes potentially operating at the same time.

@Ross has clearly mastered this part but that may be due to subtle differences with his setup.

 

[LongLive959]

Had similar issues with my Tesla and it was annoying.

In a similar vein, how do you set up the vehicle to precondition the battery via “shore power”….so on a cold winter day, battery is at optimal temp before unplugging and leaving to avoid range loss?

 

[Ross]

I think I might have discovered the answer by accident.
I am probably the only person on the entire forum who often charges their Taycan with the
Porsche charger direct from the mains (3 pin plug in UK)
My Audi Etron does more miles so is usually on the 7kw Podpoint charger

I keep my Porsche battery around 50%. My daily Porsche mileage is 5-10 miles! - 2-5kw - 5-10% depending on time of year. I have 6 hours cheap rate so I get 12kw at 2 kw per hour - 15% ish depending on temperature and losses - which is enough for me. When using the the Porsche charger it NEVER fails to preheat from the mains as it did this morning.

Try it, if you can be bothered, before you preheat unplug the 7kw wall charger, plug in the 2kw charger that came with the car and see if it works?

 

[alexsas]

maybe it has something to do with the state of charge... Recently I was hoping that I could pre-heat the 100% charged car before a very long journey (in hope to save a little more energy), but it won't have any electricity from a charger until 15-20 minutes pre-conditioning - so it looks like it would only start taking a "charge" (or use energy from a socket) if it feels like it needs charging the battery...

 

[jonjon808]

Can't say I have a reason, but I noticed the same behaviour. I charge mostly at work on 22KW and if it is full and still plugged in, when I set a departure and pre-heat timer, the car is toasty and I get in with 100% still. Today I left early and even though it was still fully charged and plugged in, when I set a manual pre-heat the car was just as toasty, but the battery was at 98%. One thing I haven't done is just unlocked the car, rather than manual pre-heat, as that kicks off the HVAC, and see if that draws from the battery or the charger.

 

[whitex]

Shore power? Since when was a Taycan a boat? Perish the thought ?

To an EV, charging stations are ports (pun intended), EV's connect to the shore for power.

 

[Midlifecrisis]

Can't say I have a reason, but I noticed the same behaviour. I charge mostly at work on 22KW and if it is full and still plugged in, when I set a departure and pre-heat timer, the car is toasty and I get in with 100% still. Today I left early and even though it was still fully charged and plugged in, when I set a manual pre-heat the car was just as toasty, but the battery was at 98%. One thing I haven't done is just unlocked the car, rather than manual pre-heat, as that kicks off the HVAC, and see if that draws from the battery or the charger.

I was going to try this today, but didn’t based on your post. Instead I put it on direct charge with the EVSE controlling times. So it charged to 100% on cheap rates. Then when it started pre-conditioning it used battery for the first few minutes. Then it started pulling power from the EVSE. The end result was that I left with a warmed car and 99% battery. I think this is the best you can do if charging to 100% on cheap overnight electricity

 

[whitex]

I was going to try this today, but didn’t based on your post. Instead I put it on direct charge with the EVSE controlling times. So it charged to 100% on cheap rates. Then when it started pre-conditioning it used battery for the first few minutes. Then it started pulling power from the EVSE. The end result was that I left with a warmed car and 99% battery. I think this is the best you can do if charging to 100% on cheap overnight electricity

If you use a timer as per my post above, you could leave with 100%, and avoid cycling the battery for no reason. Of course if leaving outside of cheap electricity window, you will pay for the preheating electricity at the higher rate.

 

[Midlifecrisis]

If you use a timer as per my post above, you could leave with 100%, and avoid cycling the battery for no reason.

Not if my cheap charge period runs until 5.30am and I want to leave at 8am

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