Theft alarm = low 12v battery!

[YLC]

Would like to clarify my understanding from this conversation.
It seems that there is a limit of 8 times that the HV battery will charge the 12v battery between each time that the car is switched on. Also that when you access the app then the car will switch on. If this is the case and assuming that the HV battery is reasonably charged then when the car will be left for a long while eg in airport parking while one is on holiday then we should log on to the app once a week to reset the counter.
In the unfortunate case of the 12v battery being dead, I don't understand the step " Fumble around with the NOCO booster to unlock the bonnet. = ALARM set off ? ". Should the booster be attached to the bonnet fuse, how do you do that?
Apologies for the silly questions, I don't have the car yet but want to increase my knowledge.
Thanks!

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[dtich]

Understood but in the real world most people would not leave their car unused for a very long period to encounter the above scenario. Layups as long as this would require other arrangements to be made as you would with an ICE vehicle.

no. no no no. why would or should this be the case? totally unnecessary and this is a matter of software tweaking for more robustness. i have had a tesla model s (i'm sorry to invoke, i know) and routinely went away for months, sometimes 6 months, at a time and during these periods i set the charge level to 50% and leave it plugged in (always when away for more than a few days)... and i have NEVER, in ten years, had an issue. come home, set charge to 85, and go. no issues. car works just as it did when i last drove it. for ten years. so.. P needs to up their software game something seriously--both in systems management and in UI and infographics, in my opinion. they would do well to hire some canadian software writers and really boost their sw systems functionality and style. i think everyone, including P, would appreciate this. my 2¢. (2p).

 

[YLC]

In the UK these are the chargers I would use:

1. CTEK Lithium XS
2. Optimate Lithium
3. Porsche Charge-o-mat Pro

The Porsche booster have a cigarette lighter plug, does that mean you can open up the frunk without opening the fuse box in the footwell? Ie, plug the booster in to the cigarette lighter and wait a few mins to start the car?

 

[simcity]

The Porsche booster have a cigarette lighter plug, does that mean you can open up the frunk without opening the fuse box in the footwell? Ie, plug the booster in to the cigarette lighter and wait a few mins to start the car?

No. I think the cigarette adapter is supplied to fit other non-EV Porsche models too (as it’s dual lead-acid and lithium capable). So they’re probably just covering all bases there by supplying one in the box.

As far as I know you can only charge the Taycan’s 12v battery from either:
- special terminals in the fuse box under the dash or
- directly from the battery terminals under the plastic cover under in the frunk area

As the other cigarette lighter outlets are all disconnected when the car is switched off.

 

[kl98cwg]

Is your Taycan an MY21? I wonder is your car subject to the WNB4 (interior sensor replacement) recall? IIRC some people affected by that where experiencing LV battery issues as a side effect.

Interesting, I hadn’t heard of that one thanks - my car is MY20

 

[simcity]

Would like to clarify my understanding from this conversation.
It seems that there is a limit of 8 times that the HV battery will charge the 12v battery between each time that the car is switched on. Also that when you access the app then the car will switch on. If this is the case and assuming that the HV battery is reasonably charged then when the car will be left for a long while eg in airport parking while one is on holiday then we should log on to the app once a week to reset the counter.
In the unfortunate case of the 12v battery being dead, I don't understand the step " Fumble around with the NOCO booster to unlock the bonnet. = ALARM set off ? ". Should the booster be attached to the bonnet fuse, how do you do that?
Apologies for the silly questions, I don't have the car yet but want to increase my knowledge.
Thanks!

Actually the charging sequence is only documented for the key OFF cycle - the car is switched off.

Activating the Porsche app is not will NOT be the same as physically switching the car on (effectively ignition on on an ICE car) referred to as Terminal 15 in the electrics description, as if you wish to drive it. So I don’t believe that initiating an App request to connect to the car resets the ‘counter’ at all.

see extract from Audi GT e-tron self study doc attached.

 

[rb33gl]

I was away for over 3 weeks, but because the problem triggered as a theft alarm I know it occurred when the car hadn’t been used for just 12 days. It really shouldn’t be necessary to have to use a trickle charger or go through the “AA rigmarole” for such a short period of time.

In the two previous years I’d left the car for 4-5 weeks several times and it was fine, so either the 12V battery is degrading or there is a software issue. I suspect the latter … also this was the first time I’d left it after getting the uPdate, so it would be interesting to know if anyone had this issue pre-uPdate.

(also thanks to Simcity for the info from the e-tron GT - really interesting read)

There's lots of threads about this, here's a couple:

https://www.taycanforum.com/forum/threads/drained-12v-battery.3941/
https://www.taycanforum.com/forum/threads/12v-battery-problems-again.14361/page-2#post-217768

Happened to me twice, and another where I happened to be in the car when it warned the 12v was low.

Very annoying and something you'd think just requires a simple software change

 

[YLC]

Actually the charging sequence is only documented for the key OFF cycle - the car is switched off.

Activating the Porsche app is not will NOT be the same as physically switching the car on (effectively ignition on on an ICE car) referred to as Terminal 15 in the electrics description, as if you wish to drive it. So I don’t believe that initiating an App request to connect to the car resets the ‘counter’ at all.

see extract from Audi GT e-tron self study doc attached.

Thanks.

 

[Scandinavian]

Would like to clarify my understanding from this conversation.
It seems that there is a limit of 8 times that the HV battery will charge the 12v battery between each time that the car is switched on. Also that when you access the app then the car will switch on. If this is the case and assuming that the HV battery is reasonably charged then when the car will be left for a long while eg in airport parking while one is on holiday then we should log on to the app once a week to reset the counter.
In the unfortunate case of the 12v battery being dead, I don't understand the step " Fumble around with the NOCO booster to unlock the bonnet. = ALARM set off ? ". Should the booster be attached to the bonnet fuse, how do you do that?
Apologies for the silly questions, I don't have the car yet but want to increase my knowledge.
Thanks!

Have you downloaded the Good to Know app for the Taycan? There is a good description in there how to open the bonnet.

The fuse box where this is done is at the drivers footwell ( at least on LHD car). Not so easy to get at in a fairly tight airport parking. And then you need to fasten the positive clip to the emergency opener and the negative to the door lock or hinges that are not painted.

 

[Raphie]

And always connect positive first?

 

[Scandinavian]

And always connect positive first?

Correct

 

[YLC]

Correct

Great, thanks

 

[W1NGE]

no. no no no. why would or should this be the case? totally unnecessary and this is a matter of software tweaking for more robustness. i have had a tesla model s (i'm sorry to invoke, i know) and routinely went away for months, sometimes 6 months, at a time and during these periods i set the charge level to 50% and leave it plugged in (always when away for more than a few days)... and i have NEVER, in ten years, had an issue. come home, set charge to 85, and go. no issues. car works just as it did when i last drove it. for ten years. so.. P needs to up their software game something seriously--both in systems management and in UI and infographics, in my opinion. they would do well to hire some canadian software writers and really boost their sw systems functionality and style. i think everyone, including P, would appreciate this. my 2¢. (2p).

I think you misunderstood - EV should be left connected to an EVSE. In an ICE you'd leave connected to a trickle charger - same thing - or have someone turn it over or drive it.

 

[dtich]

hi, thanks, no, didn't misunderstand. i have had ice cars, obviously, and currently have motorcycles with LiPO batteries that go on tenders for storage periods.. my point was that with a traction battery, and evse equipment connected, there's no excuse for any 12v battery issues. it seems to me that it is an algorithm/programming issue. the car should be able to manage the 12v charging until its traction battery is down around 20% in my opinion. there should be no need for a trickle charger, which is what was being described; and my other point was that people do have need to leave their EVs for long periods, and the tech should be able to handle that no problem. these are programming issues in my view.

 

[W1NGE]

hi, thanks, no, didn't misunderstand. i have had ice cars, obviously, and currently have motorcycles with LiPO batteries that go on tenders for storage periods.. my point was that with a traction battery, and evse equipment connected, there's no excuse for any 12v battery issues. it seems to me that it is an algorithm/programming issue. the car should be able to manage the 12v charging until its traction battery is down around 20% in my opinion. there should be no need for a trickle charger, which is what was being described; and my other point was that people do have need to leave their EVs for long periods, and the tech should be able to handle that no problem. these are programming issues in my view.

A connected EVSE acts as a trickle charger - that's the.recommemdatiom.

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