Ive got a PowerOak/Bluetti AC200P power bank. It shows 100% charge even thought the cell votages are ~3.05v. When in use it drops to about 93% the then shuts down.
Charging intially is slow but by 10 minutes it’s showing 100%. The peak battery voltage is never over 3.1v which tells me the cells are nowhere near a full charge.
Ive tried discharing until the unit turns itself off but it’s not made any difference.
has anyone else had this issue? How do I reset the batter % meter?
Hi there @Belchers sorry you are having some problems sound like you need to recalibrate the batter to recalibrate you will need to charge to full then discharge until it shuts down in one motion with nothing connected then recharge to full again with nothing connected that should recalibrate the bms. Also check for any updates hope this helps.
Once you have carried this out and and hasn’t solved your problem you can contact @BLUETTI_CARE giving them your unit serial number and they can check if there is any updates that are available but not yet pushed to your unit.
Hi there, i have tried this numerous times & no change. It charges to 6 or 7% then jumps to 100% and stops. If it’s switched off an left, when powered up again it reads 0%.
P/N 17.0301.0054-01A1.
Barcode underneath unit reads 20135TE20510277
DSP version 8005.04
ARM version 8006.04
BMS version 1106.04
HMI version 6002.01
These units in particular have a history of BMS related problems from what I have read/saw. What is the voltage across the entire array of cells (from 1 to 16) in BMS Maintenance. When you attempt to charge from the wall how many watts is inputted into the system? Its very possible to have bad cells. If one of the 16 cells is bad, it could be causing the BMS to stop charging to “protect” the system. Otherwise if all the cells (1 through 16) are at 3.05V and won’t accept a charge, it may be a faulty BMS, which these units have a nasty habit of.
Cell voltages are all within 0.2v of each other so i dont think its an inbalance or cell collapse issue. I’m thinking you are spot on with the BMS issue. I have tried to re-calibrate until im blue in the face. Ive also tried running 15v through the car charger socket as well as through the brick. The result is always the same…starts slowly but soon jumps to 100%.
Cell voltage starts at 3.05v & gets as high as 3.17v. No where near af ull charge.
Im back offshore tomorrow but when i get home im going to disconnect the batteries and manually charge them to full with my power supply. Then see what happens when i plug it all back together.
Hi @Belchers, We are very concerned about the issues you have encountered.
Regarding the problem that the AC200P cannot be fully discharged, recalibration is indeed a good solution.
Please note that during the recalibration process, when charging, you can try AC charging and DC charging separately, and no loads should be connected during charging. When discharging, you can connect a small load to ensure that the power is discharged as much as possible.
The AC200P is an early model, and the problem cannot be fixed by upgrading the firmware. If you have tried all methods but still cannot resolve it, you need to contact us to arrange for warranty service. We look forward to your reply.
I am going to assume its not under warranty because those units are pretty old now. But if you did manage to purchase it recently and its still under warranty, utilize it. If you feel comfortable, it sounds like you are going to have to open the unit up and bypass the BMS to internally charge the batteries. Positive to positive. Negative to negative. Use proper gauge wire. Blah blah you know the drill.
