Battery dropping Significant charge

[Derickbo]

Recent experience with Macan EV battery losing significant charge. I was away from my vehicle for 3 months with no one using it and left it on 67% charge (I was told best to leave between 30-80% on being away for a long time). While I was away overseas I noticed that the charge had dropped to in the 30% range which was a bit odd. Got someone to charge back up to 80% prior ro my return. On my return and charging up the vehicle again to 80% noticed that the range it was giving was 109 miles which was significantly below what it had normally been. My assumption after driving the car and seeing the range did not decrease significantly or in accordance with my distance traveled that this was merely a calibration issue. This week I had to undertake a trip of 200 miles each way and charged up to 100% prior to departure and range then registered as 132 miles - assuming this was still a calibration issue I set off. After about 65 miles suddenly a warning comes on that I now only have 20% and 20 miles range and need to recharge. I found a DC charger (350kW - EA) but car would only charge at a rate of maximum 21kW and average of 16kW. After consulting my dealer they suggested I find a dealer in the area which I did and after charging to around 69% (took almost an hour to get to that) and having around 94 mile range indicated I drove 10 miles to the dealer and just before I got there - same thing happened - warning and 20% etc. Dealer couldn't help except to recharge my vehicle on their DC charger and same thing - only 17kW/hr. Upshot is I returned home via my home dealer doing 40 mile trips and recharging and always at the same low rate even though these were new fast chargers. I have raised this with Porsche but no response and the dealer has no idea and can only fit me in 2 weeks time and they have no clue what the issue could be. There have been no other warnings. Just wondering if anyone has either had the same or know what is going on. I have had an Audi Etron GT and currently also have MB EQS and have never had this issue before.

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[craz8]

There are several threads here on this problem. Here's one - https://www.macanevowners.com/forum/threads/very-slow-dc-charging.22212/

A battery recalibration might help (which is a pain to do when away from home). The dealer can do a full BMS module reset to clear the data, and run a charge cycle to test the individual cells to see if there's a battery problem or just the software getting confused.

There's another thread for the state of charge dropping when unused - https://www.macanevowners.com/forum...le-when-left-idle-for-a-week-or-longer.23481/

Dealers aren't very useful. I would get them to lookup the workshop manual for "Control Unit for High-Voltage Battery (BMC) Loss of Capacity / Range Implausible: Reset Cell Modules. 248/24" which takes them through the process as mentioned in that first thread.

 

[Derickbo]

There are several threads here on this problem. Here's one - https://www.macanevowners.com/forum/threads/very-slow-dc-charging.22212/

A battery recalibration might help (which is a pain to do when away from home). The dealer can do a full BMS module reset to clear the data, and run a charge cycle to test the individual cells to see if there's a battery problem or just the software getting confused.

There's another thread for the state of charge dropping when unused - https://www.macanevowners.com/forum...le-when-left-idle-for-a-week-or-longer.23481/

Dealers aren't very useful. I would get them to lookup the workshop manual for "Control Unit for High-Voltage Battery (BMC) Loss of Capacity / Range Implausible: Reset Cell Modules. 248/24" which takes them through the process as mentioned in that first thread.

Thanks this is very helpful and would've been nice for Porsche to have that type of reply - also felt the dealers looked down on me when I told them it was an EV.

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