Hi @Rocketgurl, Regarding this issue, our new firmware will try to fix and balance the SOC. Please provide the SN number of your AC200MAX and the current BMS version so we can check if a new firmware update is needed. After that, a recalibration is required to restore the battery to its optimal state.
By the way, please note that if you need my assistance, please @BLUETTI_CARE, otherwise, I might not see your message and be able to help you promptly.
Hello Bluetti,
if the BMS firmware is newer than BMS 1017.07, then I could also install an update and see if the problem improves.
Hi @hamdicarlo, We completely understand your concerns. As one of the earliest supporters of our products, we certainly want our customers to feel confident using them.
The AC200MAX is safe to use, and while the SOC balance issue is a real concern, it stems from the material characteristics and the technical limitations of the time. However, we believe this does not impact the overall usability, and we remain committed to ensuring our customers can use the product as intended. Our R&D department is also discussing and researching this matter, and we hope to have a resolution soon.
I appreciate your kind understanding and patience.
Hi @jockel66, Yes, our latest BMS version is 1017.08.
Do you want to test it?
Please confirm whether your SN number is correct.
AC200M2226000689171
BMS 101707
Then we will apply for an upgrade service for you.
Yes, is my Ser.nr.
EU - German version
Ser No. 2226000689171
Thank you…
@BLUETTI_CARE
more testers means more feedback so you can prepare 1017.08 for me as well please…
SN is 2219001747138
Thanks
I am having similar problems on a 200MAX with 2 B230s. Current BMS 1017.03.
Serial number 2238001895212. Please send update
Hi @jockel66, Now I have applied to upgrade your firmware.
Our IT department will push the latest version of firmware to your unit in 24 hours.
Please upgrade the firmware tomorrow. Please do not load any device when upgrading it.
During the upgrade process, please make sure to disconnect the B230 from the AC200MAX and upgrade the AC200MAX separately. Additionally, after completing the upgrade, we recommend performing a recalibration to restore optimal SOC performance.
I hope it does help.
Hi @bearcatcrazy1971, Could you please confirm if your current firmware version is still BMS v1017.3?
Based on this, we will proceed to push the corresponding new firmware.
Hi @flintoid49, Now I have applied to upgrade your firmware.
Our IT department will push the latest version of firmware to your unit in 24 hours.
Please upgrade the firmware tomorrow. Please do not load any device when upgrading it.
During the upgrade process, please make sure to disconnect the B230 from the AC200MAX and upgrade the AC200MAX separately. Additionally, after completing the upgrade, we recommend performing a recalibration to restore optimal SOC performance.
I hope it does help.
Hi @bearcatcrazy1971, Now I have applied to upgrade your firmware.
Our IT department will push the latest version of firmware to your unit in 24 hours.
Please upgrade the firmware tomorrow. Please do not load any device when upgrading it.
During the upgrade process, please make sure to disconnect the B230 from the AC200MAX and upgrade the AC200MAX separately. Additionally, after completing the upgrade, we recommend performing a recalibration to restore optimal SOC performance.
I hope it does help.
Hi @Rocketgurl, We suggest you upgrade to the BMS 1017.07 first, if it works well, it is not necessary to push the BMS 1017.08.
Do you agree?
BMS 1017.07 does seem better. I’m not in a good place to recalibrate from the grid now, since I only have solar.
Currently using AC and DC and charging from solar, and AC200 is at 78 and B230 at 66.
I applied the firmware update and performed a recalibration. Now under normal loads with a bit of solar coming in I have the following values: Pack 1-76%, Pack 2-58%, Pack 3-96%. Pack 2 was always the odd one out before. After the update it looks like Pack 3 has gone rogue too.
Hi @Rocketgurl, Thank you for your feedback.
This appears to be within a reasonable range of variation.
If recalibration cannot be done using the grid, solar charging is also a viable option.
Hi @flintoid49, We’d like to understand how you performed the calibration. Please ensure each battery is discharged to 0%, and then charged individually to 100% before reconnecting them together.
Does this help?
I performed the calibration with all batteries connected so I suppose I need to do it all over again.
@BLUETTI_CARE, the B230 still seems to lag behind in charge numbers.
Is it possible for me to connect the D050s to the B230 while I have the solar input connected to the AC200?
I’m wondering if that might help boost charge to the B230 to compensate.
Currently percentages are AC200 78% B230 63%. So far today the AC200 has increased from 74%, yet the B230 has always been at 63%.
