Theft alarm = low 12v battery!

[tchavei]

But in the end, it appears it doesn't always so still a programming error.

BTW, I found this video on YouTube.



I'm failing to understand why the author only manages to unlock the frunk with the third (weakest) noco booster.

According to several reports on this forum, many have successfully unlocked the frunk with a GB40 and the person in the above video fails with a 115 and a 105. Eventually manages with a gb70. Really strange.

There's also a thread on this forum (can't find the link rn) where a person reported that they failed with a small 12V battery and that assistance had to bring the big guns to unlock the frunk which absolutely doesn't make sense either (the contact inside the fuse box doesn't look like supporting high amperage anyway).

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[kl98cwg]

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

If only ? … I left my car connected to the EVSE and the 12V battery went flat.

 

[dtich]

yes. exactly. i'm saying it certainly *should*, but empirical evidence is saying that it does not in some cases. this should be fairly simple stuff to get right in the battery mgmt system i would think...

 

[Scandinavian]

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

where did you see this? It is not in the manual or Good to Know.

The EVSE only looks after the main HV battery but that is fine and looses very little charge over time.

In fact Porsche has issued this info. There it states that the 12 Volt battery should be charged every 8 weeks! Which was news to me. And in the recommendations the car should be connected to the EVSE.
They also specify a 12 volt charger!

 

[Raphie]

So I’m still confused, after (too) many posts, can we please summarize:
- when not connected to an EV charger, the 12v does 8 charge attemps, then the car needs to start in order to reset the counter for the next 8
- 8 is not enough, so when not connected the 12v will deplete after a couple of weeks regardless
- In theory the 12v should be safe when connected to EV charger (working as drip charger) this is also described in the manual, but in real life for the Taycan this is NOT working and 12v‘ s still run out? (What we refer to as a software error?)
- you need a special lithium car charger, you need to bring the car back online via fuse is kick panel, then open rear trunk to charge it further and then you’re good

conclusion: In reality, for a Taycan it doesn’t matter if connected to EV charger or not, after 2-5 weeks, depending on your 12v status when you left the car, you will run out of 12v juice and need to do above. No way to prevent this In public garages, i.e. at airports going on holiday. For own peace of mind just take the ice when parking for long times?

is this a fair summary?

 

[simcity]

But in the end, it appears it doesn't always so still a programming error.

BTW, I found this video on YouTube.



I'm failing to understand why the author only manages to unlock the frunk with the third (weakest) noco booster.

According to several reports on this forum, many have successfully unlocked the frunk with a GB40 and the person in the above video fails with a 115 and a 105. Eventually manages with a gb70. Really strange.

There's also a thread on this forum (can't find the link rn) where a person reported that they failed with a small 12V battery and that assistance had to bring the big guns to unlock the frunk which absolutely doesn't make sense either (the contact inside the fuse box doesn't look like supporting high amperage anyway).

 

[simcity]

So I’m still confused, after (too) many posts, can we please summarize:
- when not connected to an EV charger, the 12v does 8 charge attemps, then the car needs to start in order to reset the counter for the next 8
- 8 is not enough, so when not connected the 12v will deplete after a couple of weeks regardless
- In theory the 12v should be safe when connected to EV charger (working as drip charger) this is also described in the manual, but in real life for the Taycan this is NOT working and 12v‘ s still run out? (What we refer to as a software error?)
- you need a special lithium car charger, you need to bring the car back online via fuse is kick panel, then open rear trunk to charge it further and then you’re good

conclusion: In reality, for a Taycan it doesn’t matter if connected to EV charger or not, after 2-5 weeks, depending on your 12v status when you left the car, you will run out of 12v juice and need to do above. No way to prevent this In public garages, i.e. at airports going on holiday. For own peace of mind just take the ice when parking for long times?

is this a fair summary?

Just read this below…

Also read the attachment in @Scandinavian post above!

tells you everything you need to know without adding more words or videos from clowns on YouTube.

 

[Speuk]

....and presumably why the manual says not to use a booster on the terminal in the fuse panel?

 

[tchavei]

We're talking about unlocking the frunk.

 

[simcity]

We're talking about unlocking the frunk.

Yep. Don’t boost it. Charge it with the correct device which has a wake up function.

Long term you’re potentially fudging your 12V battery and short term it’s potentially quite dangerous.

 

[W1NGE]

where did you see this? It is not in the manual or Good to Know.

The EVSE only looks after the main HV battery but that is fine and looses very little charge over time.

In fact Porsche has issued this info. There it states that the 12 Volt battery should be charged every 8 weeks! Which was news to me. And in the recommendations the car should be connected to the EVSE.
They also specify a 12 volt charger!

It is in the manual.

 

[Raphie]

Ok, so as long as main battery remains above 20%, the 12v will recharge 8x.
After 8x you’ll need to wake-up the car as the 12v won’t charge anymore without a wake-up / sleep cycle.
keeping the car on an EV charger works regardless of 8x recharge.
on a EV charger you should then NEVER find a dead car / 12v unless the 12v is broken.

My question was, above is all theory, in reality did people meet all of the above conditions and still found themselves with an empty 12v?

 

[Scandinavian]

This is the general and sound advice! The booster I used was just to engage the relay for the cars 12 volt battery. And once the relays clicked in and the car seemed alive I disconnected the jumpstart.

There is caution needed as there is a lot of power in the booster. Safest is of course to call Porsche Assistant and have them come and help out.

 

[Scandinavian]

Ok, so as long as main battery remains above 20%, the 12v will recharge 8x.
After 8x you’ll need to wake-up the car as the 12v won’t charge anymore without a wake-up / sleep cycle.
keeping the car on an EV charger works regardless of 8x recharge.
on a EV charger you should then NEVER find a dead car / 12v unless the 12v is broken.

My question was, above is all theory, in reality did people meet all of the above conditions and still found themselves with an empty 12v?

There seems to be a question mark about the 12 volt battery getting any charge, even with the EVSE connected, after the 8 cycles. Since the car does not really ”start up”, like pressing the on/off button in the car, (like starting a normal ICE car). I am very doubtful that connecting to an EVSE helps after the 8 Cycles.

Look at the Porsche document I included above.

Look at point 13

13. The 12-volt Lithium-Ion battery must be charged every 8 weeks the vehicle is in storage.
Important Notice: Porsche Cars North America provides the above recommendations as a courtesy for Taycan owners and accepts no liability for anything arising out of the parking or storage of your Taycan.
©2022 Porsche Cars North America, Inc. Ver1, 2022.03.14

The 12-volt battery must only be charged using a suitable battery charger that has a current and voltage- controlled charge map. To guarantee a sufficient charge, it is recommended to charge the vehicle electrical system battery as follows:
• Voltage:14.4 V
• Charge current: 80 A
• Charging time: at least 65 minutes
If leaving the vehicle parked or in storage for a period greater than 3 months, contact an authorized Porsche dealer for

 

[Raphie]

Yeah, so it seems having it plugged into an EV charger still won’t help for prolonged periods.

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