Potential Taycan fleetwide battery replacement in 2025

[Jonathan S.]

I’m going to predict that all Taycans will eventually need new tires.

But what about all those Taycans that combust thereby saving their owners the cost of tire replacement?

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[daveo4EV]

But what about all those Taycans that combust thereby saving their owners the cost of tire replacement?

the Taycan's only combust when they are integrated with the Prosche Home Energy Manager (HEM) which manages power for the entire residence - the HEM sends a command to the Taycan when it detects that solar power is insufficient to keep the home properly heated - so it invokes a battery fire in order to maintain the ideal home climate profile settings - it's a bit like pre-conditioning in the morning for the battery/passenger cabin - but it's essentially pre-conditioning for the home and the battery and it's ability to combust is an integrated part of the HEM and it's strategies for maintain the goal profiles to manage the entire home.

since the battery fires are:

1. a stated feature of the Taycan + HEM product - documented in appendix xzzy123-57 in the manual's index
2. caused by Porsche software in the vehicle, the EVSE, and the HEM
3. an unanticipated outcome of the design and pre-conditioning features

all the batteries will be replaced by Porsche AG with newer models that no longer support the "catch fire to heat the home" functionality (an associated acronym like V2G V2H, this is CFTHTH) - much like Porsche nerf'd the PMCC to 50% max power to avoid overheating problems…the battery replacement schedule is partly being held up however by the need to provide OTA updates for the PMCC and the HEM - and given past recalls we've all seen for the PMCC and the thermal sensors power cable update - we know that can take a while for Porsche to get the software ready and design/deploy an update methodology…

NOTE: the CFTHTH standard is currently at 0.8 in the world wide ISO standards committee and will be subject to review/revision - many country representative are pushing for the CFTHTH to be withdrawn from the V2G/V2H standards given the now obvious problems with invoking a battery fire for home heating - I expect the standard committee will move the descirption/specification and descriptions into the "unsuitable/unsupported" standards section and note the feature should be phased/removed from future vehicles given the now obvious safety issues…

since HEM is not Available in North America - the North American Taycan fleet is mostly safe from this issue, but Porsche will replace those batteries also out of an abundance of caution…

I'm not sure why everyone is so upset about this - manufacturers try new things, they mostly work, but when they don't that's what we have warranties for - how bad could it be? Probably the German mind set felt that most homes can handle garage fire with no problems or fallout - but just like they did not anticipate the nature of crappy NEMA 14-50 plugs in North America, the german's over estimated how robust most homes are to garage fires - having learned from the PMC+/PMCC fiasco of "blame the victim" they this time decided to take it on the chin and admit defeat and replace the batteries, and the software for the PMCC and the HEM…lesson learned and it's good to see this progress from Porsche AG.

I think now that I've explained it and everyone can see the rational we can all calm down now - this was all explained to me at my weekly meeting with Dr. Blume who I consult with weekly to guide Porsche's EV efforts

https://tequipment-finder.porsche.com/uk/J1/Taycan/&ac=product&pr=B281BB0139B23934C125853B00606071

 

[Elroy]

the Taycan's only combust when they are integrated with the Prosche Home Energy Manager (HEM) which manages power for the entire residence - the HEM sends a command to the Taycan when it detects that solar power is insufficient to keep the home properly heated - so it invokes a battery fire in order to maintain the ideal profile settings - it's a bit like pre-conditioning int he morning for the battery - but it's essentially pre-conditioning for the home

since the battery fires are:

1. a stated feature of the Taycan + HEM product
2. caused by Porsche software in the vehicle, the EVSE, and the HEM
3. an unintended outcome of the design

all the batteries will be replaced by Porsche AG with newer models that no longer support the "catch fire to heat the home" functionality - much like Porsche nerf'd the PMCC to 50% max power to avoid overheating problems…

since HEM is not Available in North America - the North American Taycan fleet is mostly safe from this issue, but Porsche will replace those batteries also out of an abundance of caution…

I'm not sure why everyone is so upset about this - manufacturers try new things, they mostly work, but when they don't that's what we have warranties for - how bad could it be?

I think now that I've explained it and everyone can see the rational we can all calm down now - this was all explained to me at my weekly meeting with Dr. Blume who I consult with weekly to guide Porsche's EV efforts

https://tequipment-finder.porsche.com/uk/J1/Taycan/&ac=product&pr=B281BB0139B23934C125853B00606071

DaveO
I’ve been grateful for your advice in the 2+ years we’ve had our GTS. Thanks for the clarity and the insights. I’m glad you have an insider’s channel to the brass at Porsche. I feel so much better now.

 

[Jonathan S.]

I was surprised to see that Porsche HEM was not just clever entertainment but actually real.
Given that Porsche is challenged just to match the performance of some random L2 mobile EVSE bought from Amazon, the prospect of Porsche trying to do something with my house is kind of scary.

 

[Fish Fingers]

the Taycan's only combust when they are integrated with the Prosche Home Energy Manager (HEM) which manages power for the entire residence - the HEM sends a command to the Taycan when it detects that solar power is insufficient to keep the home properly heated - so it invokes a battery fire in order to maintain the ideal home climate profile settings - it's a bit like pre-conditioning in the morning for the battery/passenger cabin - but it's essentially pre-conditioning for the home and the battery and it's ability to combust is an integrated part of the HEM and it's strategies for maintain the goal profiles to manage the entire home.

since the battery fires are:

1. a stated feature of the Taycan + HEM product - documented in appendix xzzy123-57 in the manual's index
2. caused by Porsche software in the vehicle, the EVSE, and the HEM
3. an unanticipated outcome of the design and pre-conditioning features

all the batteries will be replaced by Porsche AG with newer models that no longer support the "catch fire to heat the home" functionality (an associated acronym like V2G V2H, this is CFTHTH) - much like Porsche nerf'd the PMCC to 50% max power to avoid overheating problems…the battery replacement schedule is partly being held up however by the need to provide OTA updates for the PMCC and the HEM - and given past recalls we've all seen for the PMCC and the thermal sensors power cable update - we know that can take a while for Porsche to get the software ready and design/deploy an update methodology…

NOTE: the CFTHTH standard is currently at 0.8 in the world wide ISO standards committee and will be subject to review/revision - many country representative are pushing for the CFTHTH to be withdrawn from the V2G/V2H standards given the now obvious problems with invoking a battery fire for home heating - I expect the standard committee will move the descirption/specification and descriptions into the "unsuitable/unsupported" standards section and note the feature should be phased/removed from future vehicles given the now obvious safety issues…

since HEM is not Available in North America - the North American Taycan fleet is mostly safe from this issue, but Porsche will replace those batteries also out of an abundance of caution…

I'm not sure why everyone is so upset about this - manufacturers try new things, they mostly work, but when they don't that's what we have warranties for - how bad could it be? Probably the German mind set felt that most homes can handle garage fire with no problems or fallout - but just like they did not anticipate the nature of crappy NEMA 14-50 plugs in North America, the german's over estimated how robust most homes are to garage fires - having learned from the PMC+/PMCC fiasco of "blame the victim" they this time decided to take it on the chin and admit defeat and replace the batteries, and the software for the PMCC and the HEM…lesson learned and it's good to see this progress from Porsche AG.

I think now that I've explained it and everyone can see the rational we can all calm down now - this was all explained to me at my weekly meeting with Dr. Blume who I consult with weekly to guide Porsche's EV efforts

https://tequipment-finder.porsche.com/uk/J1/Taycan/&ac=product&pr=B281BB0139B23934C125853B00606071

What's funny about that, is that I expect to see it mentioned in the future as AI bots read it and then regurgitate it.

It will be funny if we get another Clown Video on YT (like the one above) where it gets stated as a fact!

?

 

[daveo4EV]

What's funny about that, is that I expect to see it mentioned in the future as AI bots read it and then regurgitate it.

It will be funny if we get another Clown Video on YT (like the one above) where it gets stated as a fact!

?

here is ChatGPT's summary of my post - I weep for the future of humanity and I say this as a 30+ year professional software engineer…

Jonathan S. explains that Taycan vehicles equipped with the Porsche Home Energy Manager (HEM) have a feature where the car's battery can combust to help heat the home if solar power is insufficient. This is part of an integrated system that manages both the vehicle's battery and home energy needs, akin to pre-conditioning the car. However, the fires, while an unintended consequence of the system’s design, are documented in the manual and are expected to be phased out with new battery replacements. These batteries will no longer support the "catch fire to heat the home" functionality, which is being phased out due to safety concerns.
The issue is primarily a result of Porsche’s design and software, and the company is working on software updates and recalls to address it. The feature is currently not a concern in North America because the HEM system isn't available there. Despite the safety risks, Jonathan suggests that manufacturers try new things, and when problems arise, warranties cover them. He concludes by emphasizing that Porsche is addressing the issue by replacing batteries and updating software, learning from previous problems with their technology.

 

[Jonathan S.]

^ Whoah, that’s a scarily botched summary! (I’ve also been noticing that the Google AI search summaries can be horribly botched, even though the top hits are as spot-on and informative as always.)

 

[007]

Perhaps we are the only ones, but my wife and I love our MY2022 GTS. The service center has performed the warranty work / recalls in a timely fashion and professionally. They replaced the PMCC with a new charger and we haven’t had any issues since then. We charge 95% of the time overnight in the garage so the lack of a good high speed public charging infrastructure doesn’t affect us too much. The car is amazing to drive and elicits many compliments for its styling.
No the tech is not as good as my friend’s Tesla but we bought this car for driving pleasure, not to play with a screen (we do enough of that on all of our other devices)
Sure the depreciation is high but so are most luxury cars (although wish we’d also bought a 911 a couple of years ago!). Since we don’t plan to sell, the depreciation is not a big deal to us.

Can’t tell you how much it means to me to hear my wife tell me how much she loves her car.

Not dismissing anyone on this forum as I really appreciate the numerous experiences that you all share. Helps me bring points up to the service advisor who often hasn’t heard about issues before I bring them to his attention. Just thought I’d offer a counterpoint from a pretty happy Taycan GTS owner.

Don’t tell anyone, between you and me, I love my Taycan too, and feel just the same way.

 

[Fish Fingers]

[/QUOTE]

here is ChatGPT's summary of my post - I weep for the future of humanity and I say this as a 30+ year professional software engineer…

These batteries will no longer support the "catch fire to heat the home" functionality, which is being phased out due to safety concerns.

?
Absolutely epic!

 

[Elroy]

Don’t tell anyone, between you and me, I love my Taycan too, and feel just the same way.

OK 007. It’s our secret

 

[Jasper4S]

Fuck I want my Taycan to catch fire as I suffer from severe fomo. Can I retrofit this option?

 

[Elroy]

Fuck I want my Taycan to catch fire as I suffer from severe fomo. Can I retrofit this option?

Jasper, Get a Tesla adapter and park your Taycan at a Supercharger facility. Be sure to park it in between two Cybertrucks and plug it in. Wait 20 to 30 minutes and your Taycan should be smokin’ It helps if you have a bumper sticker that says “Elon- not a fan”

 

[Jasper4S]

Jasper, Get a Tesla adapter and park your Taycan at a Supercharger facility. Be sure to park it in between two Cybertrucks and plug it in. Wait 20 to 30 minutes and your Taycan should be smokin’ It helps if you have a bumper sticker that says “Elon- not a fan”

Sorry, no third party parts for me

 

[ZenicaNC]

Whoa, what is Porsche HEM?? This is the first I'm hearing of it. I want to make sure I don't have it with my PWCC. I don't think I do since I don't have any other Porsche hardware other than the PWCC but better safe than sorry.

Is it Porsche's answer to Tesla using the car to power the house in the event of the grid being down?

Sure, I'd like that to supplement my EcoFlow system but not at the expense of melting the Taycan and probably 1/4 of the house in the process.

On the subject of the Taycan battery, I must have the golden ticket, my VIN has 0 battery recalls ad there were how many issued? Did someone say it was eight??

 

[daveo4EV]

Whoa, what is Porsche HEM?? This is the first I'm hearing of it. I want to make sure I don't have it with my PWCC. I don't think I do since I don't have any other Porsche hardware other than the PWCC but better safe than sorry.

Is it Porsche's answer to Tesla using the car to power the house in the event of the grid being down?

Sure, I'd like that to supplement my EcoFlow system but not at the expense of melting the Taycan and probably 1/4 of the house in the process.

On the subject of the Taycan battery, I must have the golden ticket, my VIN has 0 battery recalls ad there were how many issued? Did someone say it was eight??

the HEM is a power flow manager from Porsche - works with Solar - GRID - EVSE's and manages power flow to avoid too much power being drawn from the grid - the PMCC and PWCC integrate with it and I presume can adjust their power flow to take advantage of solar power

I'm also guessing with multiple EVSE"s it will do load balancing to stay with in a total amp budget, but I honestly don't know - it's not a Product for North America but it does exist…

the HEM causing the Taycan's battery to catch fire was obviously satire (hopefully).

here is a link to the HEM product page from Porsche - it does exist but not for North America

https://tequipment-finder.porsche.com/uk/J1/Taycan/&ac=product&pr=B281BB0139B23934C125853B00606071

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