Does your Macan EV keep SoC stable when left idle for a week or longer?

[M324]

On the other hand (and I don't want to protect the Porsche centers): What are they supposed to do if Porsche brings out a car where no error tracking is available (no errors are written in the error storage) and Porsche themselves most of the time can't provide support. From my perspective it's a general QA issue in the headquarter combined with the fact, that many Porsche centers have no clue.

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[M324]

This is something happened to me some times but the % drop wasn't that much it rather was around 1-2%.Now I wonder if temperatures have to do with this one way or another.It might be possible (I really don't know,just guessing,if anyone has a better knowledge please ellaborate) during the charging proccess the battery be warmed up thus the SoC shows the corresponding % of a warmed battery.At this state the % indication is most likely correct that's why the charging stops.Later,when the charging has stopped, the battery temp goes down, especially when outside air temperature (OAT) is very low.At such lower battery temps it might be possible the battery shows a SoC lower than before.Don't know,saying it again,just guessing if an "explanation" like this would be possible.

Might be but to be honest: I don't care what the reason is. If I would have filled up my former gas car with gasoline in the evening and in the next morning I would have had less gasoline in my tank, this would have been a serious issue which no one would accept. So why should it be acceptable with EVs?

I also do not care if this is a problem other companies might have as well. If so, all of them should find a way to fix it.

If I want to go to vacation and start with 100% of charge, then I want to start with 100% of charge and not with 90%.

 

[Petzi]

Might be but to be honest: I don't care what the reason is. If I would have filled up my former gas car with gasoline in the evening and in the next morning I would have had less gasoline in my tank, this would have been a serious issue which no one would accept. So why should it be acceptable with EVs?

I also do not care if this is a problem other companies might have as well. If so, all of them should find a way to fix it.

If I want to go to vacation and start with 100% of charge, then I want to start with 100% of charge and not with 90%.

absolutely. but as often said, this is not the case. when your car really loses that much, it is defect. your pc has to test the battery and if its ok the carging hardware & software.

 

[Petzi]

On the other hand (and I don't want to protect the Porsche centers): What are they supposed to do if Porsche brings out a car where no error tracking is available (no errors are written in the error storage) and Porsche themselves most of the time can't provide support. From my perspective it's a general QA issue in the headquarter combined with the fact, that many Porsche centers have no clue.

of course there is error tracking. esp. after the two last updates.

 

[craz8]

What are they supposed to do if Porsche brings out a car where no error tracking is available

I imagine a multi-step process with tools available.

Put a current measurement on the 12v battery to see the current flow when idle - leave for a few days. This will tell you if there's a load that shouldn't be there, and to see that the HV battery is keeping the 12v charged to manage that current draw.

If you get no 12v activity, then most of the car electronics can be ruled out, and this is HV system problem. These BMS implementations MUST have some logging mode and tool that can be used here.

If this is a 12v draw needing a recharge from HV, then I'd imagine a tool that allows you to replace each fuse in a fuse box to measure which item is pulling power when shut down. Since everything is fused, this should quickly identify the culprit (if you can test all the fuse locations at the same time, or at least a decent number of them, otherwise this could take a while)

Except for the BMS tooling part, none of this should be Porsche or EV car specific!

 

[craz8]

As another data point, I charged to 75% on Jan 5, next day was at 76% after overnight balancing. The app SOC looked stable, but when I got in the car again on Jan 11, SOC was at 69%, and on Jan 12, 68%.

I lost about 1%/day in the garage at low 60s F temperature. Macan 4S, delivered in February.

 

[byebye]

My car is at the dealership since 3rd of November, first for the red circle of death, and since 12/12, when they've said they've solved the red circles (which it remains to be confirmed), I've refused to take back the car because of the over consumption, 1% per day meaning 40 watts consumption 24/7... Problem has appeared around September/ October 2025, my macan is a September 2024 one.
They've acknowledged the problem the 16/12... and nothing new because my dealership NEVER keeps me posted.

Since, I've introduced the very first steps of a legal action through Porsche France. I'll see...

But considering that each dealership, bad or good, all around the world state that :
- they only have a limited access to the logs. maybe the wsd0 has introduced new logs, but if Porsche doesn't share them with the DA...
- the Porsche process is to give the logs to Porsche AG and let Porsche AG investigate,
- they can't do anything else, so they wait as us.
So the network of dealership is basically useless to handle our problems.

what can we expect of a centralized management of errors (real or fake) by Porsche AG?
Long times, unability to find a solution when the problem is real and is the result of a combination of software, hardware, several soft and hard options, letting alone mechanical failures.
They can't access the car, so they try do identify the problem remotely, which is fine when it's only software, but is way harder when it comes to hardware related problems: they need from time to time to ask the dealership to try things... and those things take a lot of time Because nobody at the dealership is waiting for the Porsche AG call or mail.

In the end, when a Macan in the world has a problem, it becomes a total mess for the owner, and this new problem piles up at Porsche AG, even though few Macans have problems (which nobody knows...).

IMO, It's a shame, especially and intentionally designed by Porsche AG for whatever reasons.

 

[byebye]

And my loaner Macan (which is problem free) loses 0% per week in the same conditions as my Turbo, which loses 1% per day since the problem has appeared.
(underground parking, no 4g/5g connectivity, stable temperature)

30kWh per month for 0 km/miles, I can't imagine it's "within specs"

 

[byebye]

The app SOC looked stable, but when I got in the car again on Jan 11, SOC was at 69%

I agree, the App SoC is not reliable, even if some people on this forum don't like this fact...
The app states that it has updated data, but for sure, it does't mean the data related to SoC have been updated with the latest incar value... It's probably one of the many problems of the server side Porsche services.
The only way to track the SoC is to open the car and read it on the screen.

 

[EVowner]

I do have the same issue but recently I am experiencing something new (I guess). When I start charging the car and the target is set to 80%, after some time (next morning) the app tells me that it reached the 80% and charging is done. Next time / day I get to the car it only has 75% of charge. This now happened multiple times. So either the car is not able to reach the 80% anymore (for what ever reason) or it loses 5% within some hours (4-8 hours) even though it's still plugged in. Just wanted to share this in case someone experienced the same.

Yeah, mine does exactly the same. First 2 months car had no issues hitting 80% or 100%. Then it started to not be able to hit those numbers and instead it charges to random number between 77% and 82% with limit set to 80% or 97% when limit set to 100%. I charge mostly at home during night, so I am not there when car finishes charging, but App notification always claims that charge limit was reached during a night. Few hours later when opening the car SOC is different than limit.

I tried setting my charger to constant unrestricted charge and noticed that car is thinking that target SOC is reached until it is unlocked at which moment it start requesting power again.

This started happening in September at the same time as car started reporting wrong estimated SOC on arrival - it was always claiming that I will arrive with higher SOC than car had at the start of the journey... While I was able to somehow fix the arrival SOC myself (Porsche did 2 SW updates while claiming that it will definitely fix everything, but nothing changed) upon discovering that switching to Guest mode provides correct arrival SOC estimation. I did some longer drives under Guest and that somehow fixed calculation also on my account.

Like I mentioned SOC loss on my car is just one of the random issues that my particular unit has which leads me to believe that all the problems that I am seeing are just consequence of something else. Mind you first 2 months of Macan ownership there were no problems.

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