Not stopping AC charging at Timer's percentage setting

[SergeyIndy]

Sure. A couple of kroner/dollars extra is nothing in the grand scheme of things. But routinely having charging go to 100% and having the car stay there for perhaps days until it is used, is not desirable, but harmful.
And our BMW i4 does not seem to give us this challenge. So I maintain that what Porsche chose as Taycan behaviour is flawed. When an inventive workaround is necessary, the basic behaviour is not what it optimally should be.

100% agree, especially now given ARB 5/6/7 recall with Porsche asking not to charge above 80% or you can short a module and get a red circle of death or you can get yourself a fire at worst. I wonder if you can check your VIN to see which one of these are you under. I am under ARB7 for now.

Sponsored

 

[or1]

100% agree, especially now given ARB 5/6/7 recall with Porsche asking not to charge above 80% or you can short a module and get a red circle of death or you can get yourself a fire at worst. I wonder if you can check your VIN to see which one of these are you under. I am under ARB7 for now.

I'll check the VIN, but not sure if cars delivered to Norway are included in these recalls.

Could this behaviour even be (part of) the reason why a not insignificant number of batteries fail? If many people inadvertently charge to 100% more often than they should, I mean.

 

[or1]

VIN search at NHTSA finds the car, but there is no recall for it. Now.

 

[SergeyIndy]

VIN search at NHTSA finds the car, but there is no recall for it. Now.

I wonder if you tried here: https://recall.porsche.com/

I am showing online and got a letter today for ARB7 that states that my car is monitored OTA and I do not need to do anything, but we know per @Tooney that this is old news now and remedy is available with another letter coming next to limit charging to 80%.

 

[or1]

I wonder if you tried here: https://recall.porsche.com/

I am showing online and got a letter today for ARB7 that states that my car is monitored OTA and I do not need to do anything, but we know per @Tooney that this is old news now and remedy is available with another letter coming next to limit charging to 80%.

Thanks for the link, but no recalls there either.

 

[F1Ruaraidh]

Completed my test, and guess what, it behaves exactly as you stated.

Single Timer event for 65% at a Date/Time.
65% Reached and charging stopped.
15 min later the charging restarted gunning for 100%.
There is no way to stop it from the App, must go an unplug.

This is some major flaw in the logic of how they setup it up, but I think this is what's happening, trying to make sense of the logic here.

The car defaults to being charged to 100% if no Profiles or Timers are set with Direct Charge off. Logically, nothing, since the 3 settings should be directing the car on what to do next.

I unplugged with everything disabled (Direct Charge, Profiles, Timers) and just plugged it back in, and the car starts charging asap as if Direct Charge is on but it is not.

Single Timer event completes, then the car has no more instructions to follow as it sees everything is off and then just starts charging as if it is a DC session.

The only way to prevent this from happening is to set recurring Timer events or set the EVSE to cut off power at a given time.

Mine did exthis too.

Am now reprogramming the EVSE since the Taycan is hopeless.

 

[SergeyIndy]

Thanks for the link, but no recalls there either.

This is not uncommon as they come and go. The best next thing is for your dealer to run it for you.
I hope you are up to date on all the recent obvious ones like Brake Hoses with PSM Update and Charging Cable. This next ARB 5/6/7 will be a big and painful one.

 

[SergeyIndy]

Mine did exthis too.

Am now reprogramming the EVSE since the Taycan is hopeless.

We came up with a workaround with the OP that works great. Just set a Timer with Date/Time in far future with a target rate lower than what you actually want to charge at using Timers.

 

[W1NGE]

Sure. A couple of kroner/dollars extra is nothing in the grand scheme of things. But routinely having charging go to 100% and having the car stay there for perhaps days until it is used, is not desirable, but harmful.
And our BMW i4 does not seem to give us this challenge. So I maintain that what Porsche chose as Taycan behaviour is flawed. When an inventive workaround is necessary, the basic behaviour is not what it optimally should be.

You have an 8 year battery warranty. 100% is not 100% of the battery capacity given the reserved 10%+ that you can't access.

 

[or1]

You have an 8 year battery warranty. 100% is not 100% of the battery capacity given the reserved 10%+ that you can't access.

I still think it is good battery care to avoid 100% in general, and use it only when needed for long trips. This is even mentioned in the manual.

 

[Tooney]

VIN search at NHTSA finds the car, but there is no recall for it. Now.

Highly unlikely that PCNA supplies recalled VINs to US NHTSA for any vehicles outside USA.

 

[Jhenson29]

Single Timer event for 65% at a Date/Time.
65% Reached and charging stopped.
15 min later the charging restarted gunning for 100%.
There is no way to stop it from the App, must go an unplug.

This is some major flaw in the logic of how they setup it up, but I think this is what's happening, trying to make sense of the logic here.

Not a flaw. In the manual. Been discussed many times before. A few I found quickly:

https://www.taycanforum.com/forum/threads/profiles-do-limit-soc-it-seems.17833/page-2#post-274731

https://www.taycanforum.com/forum/t...ofile-and-soc-after-update.13008/#post-196937

https://www.taycanforum.com/forum/threads/profile-timer-interaction.7684/page-2#post-110073

https://www.taycanforum.com/forum/threads/profile-timer-interaction.7684/#post-110000

https://www.taycanforum.com/forum/threads/taycan-charging-quick-reference-profiles-and-timers.6799/

 

[W1NGE]

I still think it is good battery care to avoid 100% in general, and use it only when needed for long trips. This is even mentioned in the manual.

Yes indeed not in question

 

[or1]

To try to summarize AC charging then.

1. If there is no active timer (for some future point in time), the car will charge to 100% when the charging cable is kept plugged in.
2. But charging to 100% should be done only when needed for a trip that starts within a short time of reaching the 100%.
3. An active recurring timer is by definition a timer for a future point in time and will cause charging to stop at the set percentage, and not restart.
4. If I have no active recurring timer and only set an active one-off timer when I actually need charging ("ad-hoq"), there will be times without any active timer. At these times the car falls back to its default behaviour as described in point 1.
5. To avoid charging to 100% then, I can create an active one-off timer for a point in time well into the future as an addition to my ad-hoq timer. It should have a percentage setting lower than what I usually set my ad-hoq timer to (see point 4).

I have checked my Norwegian language manual. It is quite hard to understand that this is how it works. But the more important point to me is: is it a desirable way of working? In my opinion not. It should be easy to understand how to set a charging goal percentage that sticks, and very easy to actually set it. Other brands do this.

That is timers, which I obviously did not have a good understanding of. So what about profile settings? My mental picture of them is that they set what should be a minimum level reached as quickly as possible after plugging in. But reading the manual again, they are obviously more capable/complicated than that, both alone and in combination with timers. Do any of you use them for these more advanced things?

 

[W1NGE]

To try to summarize AC charging then.

1. If there is no active timer (for some future point in time), the car will charge to 100% when the charging cable is kept plugged in.
2. But charging to 100% should be done only when needed for a trip that starts within a short time of reaching the 100%.
3. An active recurring timer is by definition a timer for a future point in time and will cause charging to stop at the set percentage, and not restart.
4. If I have no active recurring timer and only set an active one-off timer when I actually need charging ("ad-hoq"), there will be times without any active timer. At these times the car falls back to its default behaviour as described in point 1.
5. To avoid charging to 100% then, I can create an active one-off timer for a point in time well into the future as an addition to my ad-hoq timer. It should have a percentage setting lower than what I usually set my ad-hoq timer to (see point 4).

I have checked my Norwegian language manual. It is quite hard to understand that this is how it works. But the more important point to me is: is it a desirable way of working? In my opinion not. It should be easy to understand how to set a charging goal percentage that sticks, and very easy to actually set it. Other brands do this.

That is timers, which I obviously did not have a good understanding of. So what about profile settings? My mental picture of them is that they set what should be a minimum level reached as quickly as possible after plugging in. But reading the manual again, they are obviously more capable/complicated than that, both alone and in combination with timers. Do any of you use them for these more advanced things?

Profiles have additional features which can be of use.

Geolocation - auto selects to where you are e.g. multi-home use where you may wish to have a minimum charge level that is different per location.

Preferred time windows for charging to take advantage of cheaper electricity if not using a 3rd party app for this already.

Integration with a HEM (home energy manager) to mix dual energy sources - grid plus solar.

Timers and profiles are not complicated or difficult to use in reality once the basic concept is understood.

Thousands of posts on this forum about the same recurring topic and questions.

Sponsored