Battery cells reset/rebalancing after erratic SoC readings

[craz8]

So should run this discharge / charge once again

Nope, just charge from 85 to 100 again and wait a second time. It will eventually understand where 100% should be

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[ChrisFromUK]

So I charged to 100% last night, range was 212 miles
Charger showed 77kw energy ( 5% to 100%)

This morning pcm was showing 85% and 284 mile range

So should run this discharge / charge once again ?

You've added 77KW which is about 81% SoC. 81%+5% is pretty close to the 85% SoC your car is showing so this is probably accurate now.

I think all you need do is charge again to 100% and see if it stays there. If it drops (it likely won't) then charge again to 100%.

 

[minsc]

Thanks guys

 

[Wivenhoe]

I had similar but not as extreme issues with my March 25 S. My dealer had the car for 5 days and it came back as it was when I originally collected it. They told me that they consulted Germany and installed 5 or 6 smallish updates - one of which was battery management. They charged the car (on 11kv) and ran it for only about 100 miles then topped it up to 100%.

 

[Cogs79]

Hi, I got back from travel on Monday, and the car lost 17% charge in 17 days (not plugged in). I charged to 80%, and the next day when I finally had to drive it, it showed 83% on the dash (80% in the app). I never charged to 100%, or did the discharge procedure yet. I won't take the car in to the dealer but I documented everything and will give them all the details next time I need to swap tires (in a few months). Hopefully the little software updates everyone is getting after 28.13 will help.

 

[oxum]

Mine started to show erroneous SoC as well after the 28.13 update at the dealer. This happened on a smaller scale before the update (I would charge to 85% and the car would show 79 in the morning).

But now it is literally half my range that is gone. So I am following you guys advice from this thread.

First time after a night spent unplugged sitting at 5% the battery rebalanced to 18%. Good surprise so far. I then drove it down to 3% and let it sit overnight again... the next day it was still at 3%.

I figured it was not gonna rebalance at that SoC anymore so I plugged it in. Charged to '100%' today while in reality only putting in 43kW of energy in at the wall..

I am now waiting to see if SoC drop overnight again to keep adding juice. It's like half of my battery capacity is missing. Truly shit.

 

[Cogs79]

Mine started to show erroneous SoC as well after the 28.13 update at the dealer. This happened on a smaller scale before the update (I would charge to 85% and the car would show 79 in the morning).

But now it is literally half my range that is gone. So I am following you guys advice from this thread.

First time after a night spent unplugged sitting at 5% the battery rebalanced to 18%. Good surprise so far. I then drove it down to 3% and let it sit overnight again... the next day it was still at 3%.

I figured it was not gonna rebalance at that SoC anymore so I plugged it in. Charged to '100%' today while in reality only putting in 43kW of energy in at the wall..

I am now waiting to see if SoC drop overnight again to keep adding juice. It's like half of my battery capacity is missing. Truly shit.

Ok in my case, when I got back on Monday (after the battery discharged ~17% in 17 days), I charged it back to 80%, and my charger shows 16.5 kWh added so mine was not off by much (it did jump to 83% in the morning) There's a few issues going on, from high battery discharge rates when parked, to loss of accuracy with the state of charge. I might not wait until I swap my tires to have them look into this. Thankfully we get an 8 year warranty in Canada (and US?) on the EV components and battery.

Hopefully this recalibration process fixes your battery capacity!

 

[oxum]

So, good news follow up: after sitting for a bit at 100%, I entered the car the battery SoC melted on the dash down to 85% soc, with the range already increasing in its estimate.

It took two more rounds of this with 16kW and 2.5kW respectively to reach the solid 100% and correct estimates for range. I am glad it's back in order, and also glad i didn't have to waste my time explaining this to the dealer in order to get some solution.

You guys rock, forums like this one are truly lifesavers at times.

 

[byebye]

Is Porsche Macan the only EV on earth with a BMS that doesn't manage the battery?

Shame on you Porsche for not being able to fix immediately this sort of issue, and keeping your customers in the dark.

 

[Philip_1]

I think some of cars need to enter to turtle mode in order to calibrate successfully the battery.But indeed WTF they are doing as byebye said..It turns out that I know more for my car and battery management than my dealer. .

 

[Wivenhoe]

The new Cayenne EV, which uses different battery technology, the owners manual recommends a recalibration every 4,000 miles. I have no idea if recalibration is different to rebalancing - this is a far simpler procedure, although I’ve never run my S down to 4%.

Porsche recommends recalibrating the high-voltage battery every 4,000 mi (6,500 km).

Calibrating the high-voltage battery

• Temperature at the storage location above +10°C

1. Park the vehicle with a state of charge less than or equal to 4%.
2. Lock the vehicle and leave it locked and stationary for at least 1 hour.
3. Charge the high-voltage battery to 100% with direct current or alternating current.
4. Lock the vehicle and leave it locked and stationary for at least 1 hour.

The calibration is complete after the rest period. The display of the distance travelled since the last update is reset.

 

[Philip_1]

The new Cayenne EV, which uses different battery technology, the owners manual recommends a recalibration every 4,000 miles. I have no idea if recalibration is different to rebalancing - this is a far simpler procedure, although I’ve never run my S down to 4%.

Porsche recommends recalibrating the high-voltage battery every 4,000 mi (6,500 km).

Calibrating the high-voltage battery

• Temperature at the storage location above +10°C

1. Park the vehicle with a state of charge less than or equal to 4%.
2. Lock the vehicle and leave it locked and stationary for at least 1 hour.
3. Charge the high-voltage battery to 100% with direct current or alternating current.
4. Lock the vehicle and leave it locked and stationary for at least 1 hour.

The calibration is complete after the rest period. The display of the distance travelled since the last update is reset.

Exactly same procedure.

 

[Fly4ever]

I wonder why they don't also recommend the procedure for the Macan EV...They did it with the Taycan and now they do it with the Cayenne EV. Undoubtedly they must know by now the electric Macan also need it from time to time otherwise all those strange things happen.They admit 2 out of all 3 of their EVs need it so chances as well the facts are definitely the other one - Macan EV - would also be benefited.
An addition to the existing owners manual it would be all that it takes!

 

[FirstEV]

I wonder why they don't also recommend the procedure for the Macan EV...They did it with the Taycan and now they do it with the Cayenne EV. Undoubtedly they must know by now the electric Macan also need it from time to time otherwise all those strange things happen.
An addition to the existing owners manual it would be all that it takes!

Sadly, what I came to realize after some time is that the Macan is Porsche's entry point into the brand, and in many ways that is reflected in the build quality and technology compared to the company's higher-end models.

If you're looking for everything Porsche is capable of delivering, the Macan may not be the best representation of that. If, however, you want a Porsche with exceptional driving dynamics, it's hard to beat. The Macan remains unmatched by its direct competitors when it comes to the driving experience.

That said, if you're after the full Porsche experience, with the highest levels of craftsmanship, materials, refinement, and technology, I would suggest looking at models like the 911, Taycan, Cayenne, or Panamera. Anyone who has spent time in any of those models, similarly specified to a Macan, will likely notice a significant difference in overall build quality, driving experience and technology..

 

[Fly4ever]

Sadly, what I came to realize after some time is that the Macan is Porsche's entry point into the brand, and in many ways that is reflected in the build quality and technology compared to the company's higher-end models.

If you're looking for everything Porsche is capable of delivering, the Macan may not be the best representation of that. If, however, you want a Porsche with exceptional driving dynamics, it's hard to beat. The Macan remains unmatched by its direct competitors when it comes to the driving experience.

That said, if you're after the full Porsche experience, with the highest levels of craftsmanship, materials, refinement, and technology, I would suggest looking at models like the 911, Taycan, Cayenne, or Panamera. Anyone who has spent time in any of those models, similarly specified to a Macan, will likely notice a significant difference in overall build quality, driving experience and technology..

I don't think the Macan EV has problems on matters like materials and technology wise if someone is willing to spend a lot of money (and i mean A LOT) to get all those "extras" for his/her's built. I was messing around with the configurator for almost a year before I finalised my actual built.I was thinking that without almost every € of my additional 50.000 over its base price my 4S wouldn't look or feel like a "real Porsche" and I couldn't be more happy now I know my thoughts were correct.

If you need an SUV comparable to a heavily specked Macan EV I believe the options are still quite limited. The new Volvo EX60 and the BMW iX3 (and the YU7 when will arrive by the end of next year) would be the only real competitors for my taste but then again all of them must be also heavily specked to be equally compared to the Macan therefore their price will also go up considerably. And if I had to pay 100.000€ or more for a car I would prefer to get a Porsche rather than a Volvo or a BMW.

The Cayenne appears be a great choice (remains to be proven it will actually be as expected) but it's very big for my taste and needs and my garage dimensions as well!Also, I believe they offer it with far less colouring options than it actually deserves and the offered options are very limited without at least a PTS option available.The Taycan isn't an SUV and it wouldn't stand a chance even at the most modest offroad strole.

Like every other car the Macan EV will eventually mature sometime,hopefully soon.And as it matures, issues like the ones bothering us will become a thing of the past for the newer models. Same happened with Taycan.When it was introduced almost 7 years ago and the first following years looked like a disaster but look at it now...!!Despite everything was said and all the dreadfull roumors they've figured out the way and made it better.Same will happen with the Macan.It's only a matter of time.

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