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

[platypus]

Well, the battery drain may have gone away

False alert, still reliably losing 1% per day The dashcam and its external battery were not the culprits. I'm just going to ignore this issue until they fix it. I've wasted too much time trying to troubleshoot it.

Dealers are clueless, Porsche pretends it's normal (for now). I could try to make a deal, but I'm going to lose money. A brand new 4S with the same options (and less power) is more expensive than what I paid for my Turbo, and nothing tells me it won't have the same issue in 6 months.

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[EVowner]

While I am not sure if your discharge problem is same as mine since my car has many other issues I would strongly advise you to not let this go.

Mine went from losing 1% a day to 2-3% day. There is something wrong here and it seems getting worse over time. And no I am not only one seeing this - https://www.macanevowners.com/forum...or-a-week-or-longer.23481/page-12#post-370269

 

[platypus]

Thank you! You are right. I think I'm going to wait and see if a software update improves the situation, because I do enjoy the car a lot and wouldn't buy another model right now. If the issue gets worse, I'll consider pushing for a trade-in.

For now, I'm still hopeful they're working on it, and will eventually fix this for my model year, but we'll see.

 

[Reno]

While I am not sure if your discharge problem is same as mine since my car has many other issues I would strongly advise you to not let this go.

Mine went from losing 1% a day to 2-3% day. There is something wrong here and it seems getting worse over time. And no I am not only one seeing this - https://www.macanevowners.com/forum...or-a-week-or-longer.23481/page-12#post-370269

Take some pictures from your Porsche screen, over a week, so the rest of us can see your problem.

 

[craz8]

After doing a battery SOC reset that completed last week, I left the car for a few days.

On March 5, the car finished with 87% SOC. Today, March 9, I opened the door and let the car power up. Immediately, the SOC reading was 85%, but then dropped to 84% and then finally 83% as I stood and watched the car come to life. Getting into the driver's seat did not drop the SOC any further as more systems turned on.

I did not get a video of this process - perhaps next time, to have something for the dealer to see.

So over 4 nights, I lost 4% of SOC displayed.

 

[Wilco]

I have just returned from a seven week trip. When I left the SOC was 58% and the miles available 158.
On my return the SOC was 58% with the milage dropping to 152.
On starting the car and driving away the 58% soon dropped to 57%. I have to admit that I checked the car a couple times & this may have caused this drop.
My previous car, a Jag Ipace never dropped anything over a sic to seven week period away.

 

[Awaz]

I think a drop from 58% to 57% is quite normal in this scenario, especially if the climate function was turned on when you set off.

 

[Wilco]

Yes probably a bit picky on my part I agree

 

[craz8]

Again, Monday to Friday left alone: 79 dropped to 74. This time, the SOC displayed 78 when I opened the door, but didn't drop to 74 until I got in and the car turned on fully (presumably the Start button would have the same behavior).

I'll bring this up when I'm in the dealer next week to look at a rain sensor failure - I had a 'weather sensor' replaced due to this bulletin a few weeks ago that might need a bit more work. https://dot.report/bulletins/11022815

 

[TurboSpain]

I think I have good news, although it needs confirmation.

My Macan belongs to the club that loses 1% of its charge daily. Or maybe not anymore.

In the past, I tried a bunch of things to figure out the cause: I disconnected the dashcam, I didn't connect to the app to check the status, etc. Same result, it kept losing 1%.

One thing always caught my attention: the battery temperature was always about 4 degrees higher than the garage temperature.

I tried something new. I left the car with 43% and 206 km of range. I waited 4 days. Finally, I opened the car and saw this: 43% and 217 km of range.

I thought, now I'll drive a kilometer and it'll drop 4%... It didn't.
I drove 3 km and it showed 43% and 212 km of range.

Another detail: the garage was at 15 degrees Celsius and the battery was at 15 degrees Celsius.

What had changed?

The user manual and this video explain that the battery care function CONSUMES ENERGY to maintain the optimal battery temperature.



And this is what I did:

And it worked, 0% loss.

I only tested it once, so it should be repeated, preferably by more users.

If this is confirmed, the question remains: is it worth keeping the battery care function active when we're talking about moderate temperatures (10-30 degrees Celsius) without direct sunlight?

Obviously, the charging limit of 80% can be maintained even with the function deactivated.

Are you willing to try the experiment and share your results?

 

[M324]

Not sure if this is the solution as mine and other cars are losing charge even if it's cold outside and around 6-10 degrees in the garage. This function is saying that it will cool down the battery when it's too hot outside. I would definitely not consider 6-10 degrees (Celsius) as too hot.

 

[TurboSpain]

My guess is that the activated battery conservation function forces the car to "wake up" the BMS more frequently to check the battery status. This will result in energy consumption.

It's well known that low temperatures are also detrimental to long-term battery health. The owner's manual only mentions cooling the battery, I know, but it seems unlikely that the BMS wouldn't try to warm the battery if it's excessively cold.

In any case, we can only make assumptions and try different approaches, since Porsche (and all the others) doesn't provide much information about how their vehicles work.

 

[TurboSpain]

Not sure if this is the solution as mine and other cars are losing charge even if it's cold outside and around 6-10 degrees in the garage. This function is saying that it will cool down the battery when it's too hot outside. I would definitely not consider 6-10 degrees (Celsius) as too hot.

One question. When your car has been parked for a few hours, does the outside temperature match the battery temperature?

 

[Fly4ever]

I think I have good news, although it needs confirmation.

My Macan belongs to the club that loses 1% of its charge daily. Or maybe not anymore.

In the past, I tried a bunch of things to figure out the cause: I disconnected the dashcam, I didn't connect to the app to check the status, etc. Same result, it kept losing 1%.

One thing always caught my attention: the battery temperature was always about 4 degrees higher than the garage temperature.

I tried something new. I left the car with 43% and 206 km of range. I waited 4 days. Finally, I opened the car and saw this: 43% and 217 km of range.

I thought, now I'll drive a kilometer and it'll drop 4%... It didn't.
I drove 3 km and it showed 43% and 212 km of range.

Another detail: the garage was at 15 degrees Celsius and the battery was at 15 degrees Celsius.

What had changed?

The user manual and this video explain that the battery care function CONSUMES ENERGY to maintain the optimal battery temperature.



And this is what I did:

And it worked, 0% loss.

I only tested it once, so it should be repeated, preferably by more users.

If this is confirmed, the question remains: is it worth keeping the battery care function active when we're talking about moderate temperatures (10-30 degrees Celsius) without direct sunlight?

Obviously, the charging limit of 80% can be maintained even with the function deactivated.

Are you willing to try the experiment and share your results?

I'll certainly give it a try!I'm experiencing exactly the same,my battery is always 4-5 C above ambient temperature inside my (or any) garage.I even remember one time I left the car with 37% SoC for almost 2 weeks and there wasn't the slightest % loss and also the battery temp was the same with the ambient temp.Maybe below a certain % SoC the BMS stops keeping the battery at a certain temp range,as a safety feature to prevent complete battery depletion.

 

[M324]

One question. When your car has been parked for a few hours, does the outside temperature match the battery temperature?

Yes, I'd say it matches the outside temperature more or less. At least it's not recognizable that it's way warmer or colder.

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