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

[EVowner]

Mine is actually starting to get worse. This is the second time when I opened the door and saw car dropping 4% in matter of seconds during car booting up.

What is worse this time car was charged during the night with 80% limit which again it either did not managed to achieve (as always notification about reaching limit sent during a night) or discharged 3% even before me getting to the car as upon opening door it showed 77% which then dropped to 73%. If it really charged to that 80% limit we are talking about 6.65kWh evaporating in between 10hours while parked in garage.

I have not moved the car since this and today after 2 days another 2% are gone...

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[platypus]

I’m wondering if all this energy has really dissipated or if the SoC indication is unreliable (possibly both). Because I’ve definitely observed the latter.

 

[ChrisFromUK]

I used to think it was battery drain but now my suspicion is that the BMS simply isn't fully in control of the battery SoC.

Some examples from just the last 8 weeks..

1) Drove 60 miles and left car parked up at 69% SoC. Just 90 minutes later the SoC had dropped 5%

2) Left the car for 8 days while on holiday and SoC dropped 10%

3) Left the 16 days while on holiday and the SoC dropped only 4%

And on a day to day basis, the SoC is almost always lower than when I left it the previous day or two - usually around 1% a day but it is highly variable.

I also think the behavior is more erratic since the big software update. Before the update it was a pretty consistent 1% a day, now it's all over the show including the issue mentioned above about not reaching the set charge %. I actually find it will reach the limit set but plus or minus up to 4% or so.

 

[EVowner]

Mine also sometimes overcharges 1 or 2% above limit, but that is much less frequent than undercharging.

I am also starting to think that problem is either:
Physically in the battery which is unable to maintain charge
BMS unit or its software unable to correctly measure energy in the battery
Infotainment software wrongly interpreting BMS measurements

Either way all of these should should show up in diagnostic or at least I would hope so. But then again it is 6 months and they were not even able to figure out why on my car audio stops randomly during a drive...

Also from messages here it seems like Porsche can diagnose car for a week just to confirm that it is losing 1% a day and then say that it is actually expected. Which begs the question:
If it is expected why they are wasting time diagnosing this and not saying to everybody who complains about it being expected right away? And at the same time why is this expected behaviour not showing on all Macans, but only on some?

BTW I saw this

After watching this guy videos I am not sure how exactly I feel about owning EV Porsche anymore. If this is how they treat even their long time customers with cars under warranty that are having documented constant issues I don't think I will be sticking with this brand for future.

 

[byebye]

Since the latest update and after 3 months at the dealership, my car has gone crazy with the SoC...
in less than 3 days, when idling in underground parking at 14C, 9% has disappeared! I regret my 1% loss per day...

Another thing very strange: 250m to reach the end of my trip, SoC at 52%, but the nav said that the SoC will be a solid 62%.
The remaining SoC became totally non reliable since the update, and shows a SoC at destination that is superior than the current SoC... last time it was 67% for the current SoC and 85% for the estimated SoC at destination.

WTF Porsche , a reliable SoC is one of the root feature in an EV, and you can't deliver that.

 

[byebye]

For the record:

29/1: 67%

3/2: 65%

6/2: 56%

 

[EVowner]

Another thing very strange: 250m to reach the end of my trip, SoC at 52%, but the nav said that the SoC will be a solid 62%.

Also had that one way before first SW SW update done. I had to live with it for 4 months. Dealer did 2 SW updates promising that they will fix it. They did not and eventually I had to figure out solution on my own. Try switching to Guest account and it will show correct estimated SoC. Keep it under Guest and do some longer drives and it will eventually also fix your account.

 

[platypus]

@EVowner hopefully this works for him. You need to be quite immune to embarrassment to drive around trying to raise awareness on issues with your £140k car.

They definitely know, and likely working on a fix.

@byebye definitely curious to know if the Guest account workaround works for you.

 

[byebye]

I'll give it a try, thanks.

 

[M324]

I guess all of these issues related to the SoC can be summed up to: You cannot rely on this car. No matter if it's losing SoC or if it's just not displaying the SoC correctly.

Just imagine this would happen in a gas powered car. You fill it up in the evening and next morning half of the tank is empty. No one would accept this and I guess no dealer would say: "That's normal".

 

[Awaz]

Some very good points and tips here.

 

[dimaa_6abc]

To those who think this is just SoC interpretation or display quirk rather than actual energy drain - try charging the car and measure how much energy is consumed. For example, you left the car at 60%, found it at 45%, set target to 80% and charged. If 45% is just a bug and in fact it is 60%, car would consume 20kWh. But in my case it consumed 35kWh, which means the drain is real.

 

[Fly4ever]

Yesterday evening after a 183Km 2 hours drive @ 92km/hour avg speed the displayed % reduced from 70 to 18, so a total 52% was used according to SoC indicator.However the displayed avg consumtpion told a completely different story!! It was just 18,5kWh/100Km! That means I "burned" 18,5kWh X 1,83 = 33,85kWh for the entire trip length.The 52% of our total capacity of 95kWh battery is 49,4kWh.Which one of the two indications is true here?The SoC indicator is telling me I burned 49,4kWh and at the same time the avg consumption for the same total trip lenght reports 33,85kWh and there's a 15kWh difference here.So either the one must have shown a smaller % of energy used or the other must have shown a cosniderably higher value of kWh/100Km.
Also,another strange thing while I was driving,some times the SoC dropped by 1% very fast without any reason in terms of aceleration/road change/wind/temperature.Straight road,steady 115km/hour,12 degrees C, Soc 1%/4km. In some cases SoC 1%/2km or even less!!!
Something strange must going on with SoC.It even makes me wonder if the displayed % is the actual battery present SoC.Because if there's a discrepancy here maybe the battery is never fully charged even if the displayed SoC shows 100%!

Also,when yesterday I arrived at my destination prior returning home,for the same trip of 183km,SoC was telling me I arrived with 20%.When I charged the car at a 22kW public charger I got 30kWh according to the charger application.But again the SoC was telling a totaly different story according to which I went from 20% to 70% so I got another 50% of our battery capacity (47,5kWh) from the charger.Seems like the car misinterpreted the charged energy of actual 30kWh for 47,5kWh!!!

 

[craz8]

To those who think this is just SoC interpretation or display quirk rather than actual energy drain - try charging the car and measure how much energy is consumed. For example, you left the car at 60%, found it at 45%, set target to 80% and charged. If 45% is just a bug and in fact it is 60%, car would consume 20kWh. But in my case it consumed 35kWh, which means the drain is real.

I would contend that, if you don't trust the 45%, nor the 60%, then you also can't trust the 80% value either, so you can't tell anything about the relationship between SOC % to kWh.

And that is actually quite bad for the car.

My dealer just DC charged my car to "80%" after some work. I drove home - 4+ miles, parked the car, and came back a little later. Now I see "84%" displayed. The BMS does rebalance when shut down, but being off by at least 5% is quite a lot. (I've seen big adjustments after DC charging several times now)

This can be really bad if the charging curve calculation is relying on 80% being 80% to limit the current going into the battery. If the car is actually at 85%, then the current will be MUCH higher than the design allows and could cause premature degradation of the battery despite all the displayed numbers being within spec. The charge rate drops significantly around 80%: 80% allows for 110kw+, where 85% is restricted to 50 kw. That's a lot of unexpected power going to the battery.

I don't know if this BMS recalculation is related to the SOC drain issue, but if the car can't tell what the battery has, then confusion reigns.

 

[dimaa_6abc]

I would contend that, if you don't trust the 45%, nor the 60%, then you also can't trust the 80% value either, so you can't tell anything about the relationship between SOC % to kWh.

And that is actually quite bad for the car.

My dealer just DC charged my car to "80%" after some work. I drove home - 4+ miles, parked the car, and came back a little later. Now I see "84%" displayed. The BMS does rebalance when shut down, but being off by at least 5% is quite a lot. (I've seen big adjustments after DC charging several times now)

This can be really bad if the charging curve calculation is relying on 80% being 80% to limit the current going into the battery. If the car is actually at 85%, then the current will be MUCH higher than the design allows and could cause premature degradation of the battery despite all the displayed numbers being within spec. The charge rate drops significantly around 80%: 80% allows for 110kw+, where 85% is restricted to 50 kw. That's a lot of unexpected power going to the battery.

I don't know if this BMS recalculation is related to the SOC drain issue, but if the car can't tell what the battery has, then confusion reigns.

This is a very valid point, and again we have to either live with that or get rid of the car. What I learned: I will never order a Cayenne EV without it being on a market for at least a year, and thorough perusal of forums to look for similar issues. Only when it is absolutely trouble-free will I order one.

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