Charging to 100%, why not?

[Vim Schrotnock]

Here are two screenshots from my reading of the battery charge. The first is the battery at 95% charge level if I remember correctly. The second one is around 20 %. So would the cells be overcharged at > 4.2 volts??

Interestingly you can clearly identify the two modules that were replaced in September. If I let the car stand for about 12 hours, the cells will all be equal, both at the top level as well as the bottom level. The 95% charge was done with 3.1 kW supply over quite a number of hours. Looking at the charge curve there seems to have been a lot of issues with supply, perhaps many cars charging or the grid supply was unstable.

Peter,

This is definitely strange. My two cells show much higher voltages at low charge, and slightly higher voltages at high charge every. Did you get your HV controller software checked? I would definitely get this checked out at your dealer. I'm also reposting the answer to your question about what process I followed after module replacement. It is definitely working in my case.

Hey Peter - I'll just give you what I was told directly. After module replacement, drive the car down to 10-15% charge and let it sit overnight, and then charge to 100%. If you can do this on your home charger it is best. Repeat 3 times. Then, do this once a month or so afterwards. My battery is now better than it's been since I've been taking records - 237 mi range at 85% in normal mode in 48 deg temp. The tech said my SOH should benefit from this, and I've seen it on my OBD. When I got it back, it was 90.43 on my OBD, but the tech said their measurement indicated 92.6. Now I'm at 93.47 SOH on the OBD, and it's been steadily increasing after each 'rebalance'. Good luck! Mike

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[Scandinavian]

Thanks Mike,

I got a new HV Batteru]y Controller since that failed as well. When I talked to the service manager he told me they also had updated all the software and firmware around the battery. And remeber my SoH showed crazy values with 99. 5 %. Still now after driving the car some 4000 km the SoH in the Car Scanner app shows 96%! I am no longer providing any info to the thread about SoH etc.

 

[tzo]

I m a new owner of a CT Taycan (obviously with the large battery) and i can t use the car yet because i don t have the new plates.When i delivered the car the battery was at 90% with 385km of range at Normal mode.I tried today to charge the car to see the speed of charge.The number i took was 21kw/h but the fully charge state would be ready after 1.5 h.I understood that the speed of charging is slower over 85%.
Can you tell me how much time needed from 10-85% approximately with a 3phase 22kw ac charger?Something like 4h?

 

[hifi239]

I m a new owner of a CT Taycan (obviously with the large battery) and i can t use the car yet because i don t have the new plates.When i delivered the car the battery was at 90% with 385km of range at Normal mode.I tried today to charge the car to see the speed of charge.The number i took was 21kw/h but the fully charge state would be ready after 1.5 h.I understood that the speed of charging is slower over 85%.
Can you tell me how much time needed from 10-85% approximately with a 3phase 22kw ac charger?Something like 4h?

Hi, you might repost your question as a new thread if your questions aren't answered here. If this is a 2024 or earlier, the battery holds 93 kWh. At 90%, there is 9.3 kWh to go. At 22kW, that should take less than an hour to get to 100%. To go from 9.3kWh to 79kWh with no slowing is 70kWh/22kW = 3 Hours. Probably between 3 and 4 hours. I don't believe there will be much slowing up to 85%. Above that, maybe a little less than 22kW, but pretty close. The real slowing occurs when you are DC fast charging where it will drop from 150kW or 200kW down to 50kW or less as you close on 100%. Note also that it is not recommended to keep the car parked and charged to 100%. Keep it at 85% maximum unless you are going to drive it a long way right after charging. Then 100% is fine.

 

[tzo]

Its 2023 model.I wrote here cause yesterday i pluged the car and and the time of total charging from 88% to 100% was around 1.5 hour and seemed to me to much.From this thread i read that the last 15% is much slower than the rest of the charging and i wanted to confirm that.I took the plug off after a couple o minutes cause this was a long prruod of charging to wait olus the car will not be driven the next days.The strange thing is that the Porsche app was showing a charging speed of 21kw/h.The car has the 22kw onboard charger.I don t know if i have to activate something to receive the hole power of the domestic charger.Anyway for the moment i wont charge it any more.

 

[hifi239]

Porsche app was showing a charging speed of 21kw/h.The car has the 22kw onboard charger.

I would not be concerned with that difference. It is likely to be due to losses in the electronics. But yes, 21kW for 1.5 hours should have given 30kWh, which is much more than the 12kWh remaining to be charged at 88%. I don't understand that. It is possible some of that energy went to heating the battery. Next time you go from 88 to 100 check the battery temperature before and after.

 

[kort]

if this has been posted accept my apologies;

there is no problem charging the car to 100% providing that you almost immediately start driving and burn off some of the battery. the problems can begin when the car is left sitting for a long time at a high SOC, over 80+%

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