Not stopping AC charging at Timer's percentage setting

[or1]

I have had no problems with "overcharging" before, but I don't know why. Has the wallbox (Easee) made this happen, or other settings? Because now the car stops briefly at the set percentage, but after some minutes it starts again and goes to 100. Anyone know remedies for this - apart from pulling the plug?

It is awfully bad behaviour. Bad for the battery, bad for trying to slot the charging into the periods when electricity is less costly, bad for balancing total consumption in the house. To have to get up at any time in the night to unplug in order to stop charging at 80% or whatever is hopelessly silly.

By the way, wife's BMW i4 M50 does not do this, I can set a timer with percentage and it sticks. It is also on an Easee wallbox. And my Taycan did not do it until a couple of weeks ago.

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[W1NGE]

I have had no problems with "overcharging" before, but I don't know why. Has the wallbox (Easee) made this happen, or other settings? Because now the car stops briefly at the set percentage, but after some minutes it starts again and goes to 100. Anyone know remedies for this - apart from pulling the plug?

It is awfully bad behaviour. Bad for the battery, bad for trying to slot the charging into the periods when electricity is less costly, bad for balancing total consumption in the house. To have to get up at any time in the night to unplug in order to stop charging at 80% or whatever is hopelessly silly.

By the way, wife's BMW i4 M50 does not do this, I can set a timer with percentage and it sticks. It is also on an Easee wallbox. And my Taycan did not do it until a couple of weeks ago.

Make it a recurring timer event along with your profile so that the first session stops pending the next one for the following day. Doesn't matter then if connected or not on any recurring day.

 

[SergeyIndy]

This is by far the most discussed topic, but each situation is different, so let's start by you posting your current charging settings: Profile and Timer screens then we can review.

 

[or1]

I don't have an active profile, but it looks like the first picture. My timers are as shown in the second picture - that is, I modify the non-repeating timer according to needs and electricity prices (which vary by the hour). I don't have a need for repeating charging at a fixed schedule these days.

And maybe there lies the reason I have not thought the charging behaviour was a problem before: earlier I have always had a repeating timer active, even though it did not specify a charge every day. My mental picture of the software has been that a timer - any timer - handled starting and stopping of charging, and nothing would happen afterwards. So I have not even bothered reading about the problems others have. I was in the clear and happy.

But what possibly complicates it more, is the interventions of software at the electricity supplier Tibber, which controls the wallbox. For the BMW there are plugins that handle communication with the car as well as the wallbox for it, but they have skipped making the same for Porsche cars. They control just the wallbox then, and strange things may happen as a result.

I appreciate very much if someone comments further on this. But I will certainly read other threads that I see now (I did a search before starting this, but it was too simple), to gain a better knowledge of it all.

 

[SergeyIndy]

I have reviewed this and everything you have setup to achieve 80% by departure time set by the Timer is correct with Profile OFF assuming that you have the most obvious Direct Charging set to OFF and you verified that the Profile and Timer settings in the car match the App (as they may be out of sync)!

Regardless of the EVSE, the car follows the timer with expected outcome to reach 80% by the departure time you set at 9:30 tomorrow. The one thing that I see different, that I will try is that your Timer is not recurring (that we are sorting out) and set for a specific date. I will test my Timer function with a fixed Date and Limit and see if it will run away to 100%. I can do it in the next hour and report back.

The other thing to try that Porsche corporate would advise when things do not sync up with App and Car is to clear cache, log out of the app, deleted it, and reinstall. Then do a 2 finger PCM reset. I had issue with Nav destinations not able to be deleted and that fixed that, different issues but that is something they advise when things do not seem to work as expected.

 

[or1]

I have reviewed this and everything you have setup to achieve 80% by departure time set by the Timer is correct with Profile OFF assuming that you have the most obvious Direct Charging set to OFF and you verified that the Profile and Timer settings in the car match the App (as they may be out of sync)!

Regardless of the EVSE, the car follows the timer with expected outcome to reach 80% by the departure time you set at 9:30 tomorrow. The one thing that I see different, that I will try is that your Timer is not recurring (that we are sorting out) and set for a specific date. I will test my Timer function with a fixed Date and Limit and see if it will run away to 100%. I can do it in the next hour and report back.

The other thing to try that Porsche corporate would advise when things do not sync up with App and Car is to clear cache, log out of the app, deleted it, and reinstall. Then do a 2 finger PCM reset. I had issue with Nav destinations not able to be deleted and that fixed that, different issues but that is something they advise when things do not seem to work as expected.

Thanks a lot for checking! (And I sure don't have Direct Charging set.)
If also your Taycan goes on after reaching percentage when there is a single non-repeating timer - not immediately but after maybe a half-hour - then we can assume it is by design. By awfully bad design I'll say.

 

[SergeyIndy]

Thanks a lot for checking! (And I sure don't have Direct Charging set.)
If also your Taycan goes on after reaching percentage when there is a single non-repeating timer - not immediately but after maybe a half-hour - then we can assume it is by design. By awfully bad design I'll say.

I am very curious now what happens. I set to reach target 30 min from now to 65% then will keep it plugged in to see if it restarts to go to 100%. This would be hard to believe, but I will check the Timer section of the manual one more time if there is anything there regarding Timer with a set Date.

 

[SergeyIndy]

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.

 

[or1]

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. I will try to have everything disabled (Direct Charge, Profiles, Timers) and just plug the car in and see what happens. Logically, nothing, since the 3 settings should be directing the car on what to do next.

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.

Thanks again! Indeed it looks like that. And I and others have been fooled by the side effect of having a future timer set.

It is a kind of logic, but I agree that it is flawed. I think I will communicate it to my dealer and Porsche Norway as a serious flaw, or even an error.

 

[or1]

We could test what happens if there is a single timer half a year or more into the future - if that is enough to keep it from going for 100.

 

[SergeyIndy]

We could test what happens if there is a single timer half a year or more into the future - if that is enough to keep it from going for 100.

I like that idea a LOT. I can test this out. You are onto something. Nothing like a workaround on an appliance that costs a fortune with the main function of it to being used is charge planning!

 

[SergeyIndy]

I wonder now of this flaw has being copied into the Macan EV. I would be interested in @daveo4EV to test it out and let us know who just got a Macan EV Turbo.

 

[SergeyIndy]

We could test what happens if there is a single timer half a year or more into the future - if that is enough to keep it from going for 100.

This is what my test found.

Test 1:
Current fixed Date/Time Timer completed at 70%. Far Future Timer set to 50%.
Behavior: Charged to 70% and reports charging completed and did not restart to 100%.

Test 2:
Current fixed Date/Time Timer completed at 70%. Far Future Timer set to 85%.
Behavior: Charged to 70% and reports charging completed, then goes into blue Pause mode.

Takeaway: Far Future Timer needs to be set to less than Current Timer charge level so the charging for the Current fixed Timer stops and ends there.

I think we got it solved together!

 

[W1NGE]

Thanks a lot for checking! (And I sure don't have Direct Charging set.)
If also your Taycan goes on after reaching percentage when there is a single non-repeating timer - not immediately but after maybe a half-hour - then we can assume it is by design. By awfully bad design I'll say.

Read the Owner’s manual - there is a 30 minute wait period from distant memory which if exceeded the car will continue to charge.

Daily timer + profile is needed to control your session in general.

Charging at home in general is as cheap as chips when compared to public charging - don’t sweat the extra sheckles…you own a Porsche and assume this isn’t really the issue.

 

[or1]

Read the Owner’s manual - there is a 30 minute wait period from distant memory which if exceeded the car will continue to charge.

Daily timer + profile is needed to control your session in general.

Charging at home in general is as cheap as chips when compared to public charging - don’t sweat the extra sheckles…you own a Porsche and assume this isn’t really the issue.

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.

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