Is This What LFP Miscalibration Looks Like?

[PianoAl]

I took this screenshot at 11:17 AM. Although charging is usually complete well before the scheduled departure time, in this case, it was 39 minutes late (it actually finished at 11:24).

Tessie (see sig) hasn't been charged above 70% for months. I wonder whether the completion prediction was off because of that. It started charging at 69%, but perhaps the true SOC was lower.

 

[DuncanM]

I took this screenshot at 11:17 AM. Although charging is usually complete well before the scheduled departure time, in this case, it was 39 minutes late (it actually finished at 11:24).

Tessie (see sig) hasn't been charged above 70% for months. I wonder whether the completion prediction was off because of that. It started charging at 69%, but perhaps the true SOC was lower.

if you're using a ~7kw charger and you charged to 100% it might have done a calibration, which will extend the nominal charging time.

I don't see any photos attached to your post, above.

 

[ucmndd]

Very normal for the a car to sit at 99 or 100% balancing cells for 10, 20, or even 30+ minutes, especially if you haven't charged to 100% in a long time (your owners manual suggests you should charge to 100% at least once a week).

 

[PianoAl]

Here's the screenshot:

 

[ucmndd]

Here's the screenshot:

Again, very normal.

 

[yesimon]

It started charging at 69%, but perhaps the true SOC was lower.

According to the screenshot the charging session added +33 kWh, which would be 55% SOC added (of a 60 kWh pack). Therefore it does appear that the true SOC was lower than 69%.

 

[PianoAl]

According to the screenshot the charging session added +33 kWh, which would be 55% SOC added (of a 60 kWh pack). Therefore it does appear that the true SOC was lower than 69%.

Good info, thanks, Mon.

Sounds like this is a good indication how "off" the BMS can be. IOW, after never being charged to 100% for months, it said the SOC was 69%, but it was really 45%.

I'll charge to 100% a little more often--maybe once a month.

The Puzzling Reason Why Tesla Misleadingly Recommends Charging the LFP Batteries to 100%

Tesla recommends owners of Model 3 cars with LFP batteries charge them regularly to 100%, but this is not the way to go if you want to extend the battery's life

www.autoevolution.com