I plug it into the wall and i charges to around 20% and then goes straight to 100%. If i turn off the unit and turn it back on it says around 20%. I keep draining the battery and then charging it again but the same thing keeps happening. Only takes about 20 minutes to charge to 100%. But i turn it off and on and it only says around 20%.
Hi @KDP , Can you please send a video to our support department via service@bluettipower.com if you discharged the device and then re-charged it again and still can’t fix it?
Also, can you confirm that all other charging methods are working properly, except for the adapter charging problem? Thank you!
How do i send a video through email? Wont be able to shrink the size of the video to under 25MB
KDP
@KDP seems to be a BMS issue internally. I would try completely discharging the unit (until it shuts off power to whatever your discharging with) and then try recharging it completely to 100% again via wall charger. Then discharge it again to 0% and try charging it again with car/PV input. Make sure nothing is plugged in and running and ac/dc sides are “OFF” during these recharge cycles. This should hopefully reset that internal bms. Keep us posted man
Thank you for the quick response. I’ve been charging and discharging every other day at home witj the wall charger and at camp with the bluetti solar panels that i got about a month ago. It hasnt fixed itself yet. I will give it another go. Worked amazing all last summer. Not sure why this is happening.
Kramer
I have charged and discharged this AC200P multiple times. I charged to 100% or so it says. I turn it off and back on and it says anywhere from 13% to 26%. I even charged it to 100% and kept it on. Discharged it to around 70% give or take and it goes right to 0% from there. I tried slow discharge with just a lamp plugged and i also tried discharging fast with a hair blower at 1300w. It only takes from so called 100% to discharge to 70% and then skip to 0% in less than 5 minutes. I’m going to camp tonight to try and charge with the solar panels and then discharge them a couple of times. I have a feeling that I’ll have very little power all weekend and it will not fix itself. Not sure what else to do? This has a 2 year warranty?
Also i charged the unit everytime without anything plugged in and both AC and DC turned off.
Kramer
While i was at camp i charged the Bluetti from 0% to 100%. These are 2 videos showing whar happed. This Bluetti is useless if i can’t get it to charge. I need something fine about this.
Thanks
Kramer
https://drive.google.com/file/d/169O0n1crAxY_yikznBsA9FJ_glMisU37/view?usp=drivesdk
https://drive.google.com/file/d/169jB2uI4QPJb2w0LPgpYElPI5ghzmhLC/view?usp=drivesdk
Hi @KDP , thanks for sharing the info above. But we don’t seem to be able to see the videos you share in Google drive, can you turn the permissions on?
Or we suggest you upgrade the BMS first to see if this problem is still happening?
I am having the same issue as @KDP. Fully charging and discharging (multiple times) does not solve the issue.
It won’t charge beyond about 3.25 volts per cell.
How do I “upgrade the BMS?”
@speakerdude Please try the following suggestions:
1, Try PV and car charging to see if it can be filled normally.
2、If there is still a big jump in SOC capacity, then it is mainly a problem with the battery pack or BMS board, you need to contact the support department at service@bluettipower.com to return the machine to the service station for repair.
- I tried this multiple times with the solar input and the wall charger input. Both behave the same way, only bringing the unit to about 15% state of charge before abruptly jumping to 100% after only about 20 min of charging.
I think the root cause of this issue is on the BMS board. After the 20 min charge to “100%”, the BMS is reporting the individual cell voltages to be 3.21V ±0.01V which I believe to be accurate. 3.21V * 16 cells in series = 51.36V. On another BMS display it is reporting the overall battery pack to be 56.8V, which I believe to be inaccurate. What I think is happening is that the BMS is somehow out of calibration for its overall pack voltage reading, reporting 5.44V higher than actual. This is likely terminating the charging phase early.
- I am in email communication with someone from your service team. I am hopeful that they will send me a replacement BMS board as they did for @bigbluefan on your forum here: Bought a broken Bluetti AC200P