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Reset SOC button in Service menu?
- Thread starter CKwik240
- Start date
KerryOH
Member
Probably related to 2024.8.x One time Charge Limit:
If you're planning a road trip, you can choose the One-Time Charge option.
This option appears when you increase the Charge Limit above the daily driving recommendation.
If you're planning a road trip, you can choose the One-Time Charge option.
This option appears when you increase the Charge Limit above the daily driving recommendation.
That doesn't make sense to me. Why would they bury such an option in the service menu? And the label on this button doesn't match what you describe.
Max Spaghetti
Member
Guessing here: probably tells the BMS to recalibrate based on the measured voltage of the battery pack.
Depending on battery chemistry, this may only be accurate at either high or low SOC (hence the <15% or >90% notation).
I believe the BMS does this automatically from time to time, but they also provide it as a service option.
Depending on battery chemistry, this may only be accurate at either high or low SOC (hence the <15% or >90% notation).
I believe the BMS does this automatically from time to time, but they also provide it as a service option.
I did run into some reference to BMS calibration or reset when searching this. Perhaps it's the same thing? I didn't see an option for BMS calibration but I want really looking for it when I was in the service menu. Thanks for the input. Perhaps someone will figure this out at some point...
I was saying why bury the one time charge option. That seems benign so I don't think that's the function of this button.
Many of us have tried pushing it and couldn’t figure out which/where battery contactors to open to get the item to successful take action. Right now if you push it, you will get a failed message because your contactors are still closed. Since it is a BMS related, it needs a open circuit on the battery to properly measure open circuit voltage.
I think just need to open the contactor under the rear seat before running the test. I never did it.
I think just need to open the contactor under the rear seat before running the test. I never did it.
So we are certain it's the BMS button? I just couldn't find anything on Google to even suggest this so I didn't associate the two.
On a side note, sound like there are a lot of brave souls that just like to push buttons without knowing what it does....
Max Spaghetti
Member
Max Spaghetti
Member
Just wanted to let you know that I tried to push this again today and it did do something this time. This time the contactors self opened, short delay, and then self closed. It also changed my SoC from 10% (30 miles) to 11% (29 miles). My car had been sitting at 10% almost all week. I am going to try this on my wifes MYP which I feel may benefit more. I may do it once at low SoC and once at High SoC, next time I do fully charge before a trip.
It also does now say make sure the battery has rested for at least an hour (from driving or charging) before attempting this.
It also does now say make sure the battery has rested for at least an hour (from driving or charging) before attempting this.
Resets SOC (updates from OCV) on each sleep on a non LFP.
The >90 or less than 15% makes sence on a LFP that can not measure the SOC in the middle range.
I would guess that picture is from a LFP car from those values.
I have M3P and the <15% and >90% are there as well. It warned me to to ensure car was rested (not driven, charged or Climate On) for at least one hour within the range before it ran the routine.
Thinking the end points are needed for the BMS to establish and fit/shape an updated OCV vs SOC curve.
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