AC500 098. BMS Over Voltage

[Deano]

Hi Bluetti Please can you help with the following
I have an AC500 + 2xB300s + 2xB300 configuration. I have the 2xB300s connected in serial on the first AC500 battery connection port and the 2xB300 connected in serial on the Second AC500 battery connection port.
Everything works fine except when the complete unit reaches fully charged between 98% and 100%. At this point I hear ‘Alarm’ buzzer/beep every time and the Alarm error code 098.BMS Over Voltage displays in the Alarm screen.

On further investigation the alarm fault is always and only applicable to the 2xB300 which have been allocated slots Battery Pack 1 & Battery Pack 3 .

I charge from 2 x Solar Arrays and well within the max 150v so I assume the Alarm code is due to the slightly different chemistry set up between the B300 and B300s when approaching fully charged. If the Complete unit stays fully charged the Alarm code does clear by itself, however if the SOC fluctuates just a little back and forth to say 98% and 99% it activates the alarm again which means it is constantly going off! Quite disconcerting!

Is this something to be concerned about? Do I need a firmware update?
For reference here are my AC500 details

Your help is much appreciated.
Dean

[BLUETTI]

@Deano We are very sorry for the inconvenience. Based on product failure-related issues, our care team @BLUETTI_CARE will assist you in resolving them.

[BLUETTI_CARE]

@Deano I contacted the tech team and they push a firmware for you, please try to update the firmware to check if the problem can be solved.

[Deano]

Hi Thank you for getting back with a quick response.
Ok I went into the App and saw ‘Firmware Upgrade’ and BMS Version was highlighted in blue
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In the ‘Battery Information’ the ‘Check For Update’ button was available for all 4 batteries. Both B300 batteries were on Version v1014.10 and so when I tapped on these a dialog button/info box popped up and stated ‘No new firmware version’
Next I checked the ‘Check For Update’ button for the two new B300s I noticed one was running version v1022.09 whilst the other was running version v1022.08. The prior came back with the same dialog button/info box pops which states ‘No new firmware version’
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However the B300s on v1022.08 came back with the following screen
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I followed this to the next screen
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I followed this instruction and disconnected the other batteries and left the B300s running v1022.08 and this time the above screen was omitted and the firmware update started.
Now then I didn’t expect the following. As the firmware started I heard some sort of ‘pop’ (like a capacitor blowing) and the AC500 and the connected B300s shut down. Following this on starting up the unit the B300s would turn on but the round ‘On’ button was flashing and none of the charge status 5 small green lights were illuminated
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Now also on the AC500 all these new following error messages simultaneously came up
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Following this I disconnected the now defunct battery and checked all the others and all the cables. I left the defunct B300s turned off for some three hours and then turned it on again and I can confirm it is now a very heavy paper weight and so I will need to arrange a return.
Now then I had started another thread on this forum relating to how many actual B300 batteries can be connected to the AC300 when connecting both B300 & B300s as I was originally given the wrong information as a backer on Indiegogo which stated 2 max when actually Bluetti now states ‘If the b300 is connected first, then to the b300s, AC500 is able to identify six battery packs.’
So as I have a spare B300 I have connected this (in replacement of the now defunct B300S) on the same chain port as the other two B300 in serial, so I now have 3X B300 in total. I then connected the remaining B300s v1022.09 (so no firmware update needed) to the second chain port. All fine and working - except the same original problem presents itself when the unit reaches fully charged between 98% and 100%. At this point I hear again the ‘Alarm’ buzzer/beep every time and the Alarm error code 098.BMS Over Voltage displays in the Alarm screen.
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Agggghhh!!! So I’m now one B300s battery down following precisely the firmware update instructions and still have the same issue!
Where do we go from here?
Your assistance is very much appreciated
Kind Regards
Dean

[BLUETTI_CARE]

@Deano The error code shows that you may not lock the cable entirely. Could you please check again?

[Deano]

Yes the cable was absolutely locked. I assume you are referring to the new set of error codes?
.001. DAMCU Warning
.054 D-BAT Drained
.081. BMS communication Interrupt
.103.BMS Communication Cable Error
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As we know if the cable is not locked the 103 warning comes on instantly along with a warning beep upon boot up without any other code showing. The cable was locked as no code came up as the B300s Firmware update started. It seems the AC500 cannot communicate with the now defunct B300s and due to a fault arising on the circuitry of the defunct B300s so the AC500 displays the 103 error along with the 3 other new error codes! As I mentioned I heard a ‘pop’ sound coming from inside the unit and the one connected B300s battery went dead. Its still dead even after disconnecting then reconnecting it and trying everything else. I did state above I checked all the other cables etc.

Notice the following picture I attached /sent
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The battery is now defunct whether it is attached/locked or free standing. The start up round light flashes permanently on the now defunct B300s ( none of the other batteries do this - their start up lights just come on permanent as normal ) Also as mentioned the green row of power lights do not come on. The battery was about 98% fully charged and all 5 green lights were illuminated just prior to the Firmware update attempt, now nothing!
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Also as mentioned the original problem exists without the defunct B300s attached. This error relates to the charging of the B300 batteries as opposed to the B300s - It tells you this in the Battery information
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Please can to email me at dm@myzupa.com so we can arrange the return of the defunct B300s and then we can continue the original 098. BMS Over Voltage charging issue/discussion here.
Your help is much appreciated
Dean

[BLUETTI_CARE]

@Deano Message sent, please check your email.

[Deano]

@Deano Thanks for your detail description. Please connect AC500 and each B300 to check if there is a firmware for an update in 12 hours.

[Deano]

Very strange as I posted an important detailed reply/update here four days ago on Thursday 1st June and checking today Monday 6th June to notice it has vanished without a reply?? The time stamps demonstrate Bluetti Care have been active on this thread just one hour ago???
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Have you deleted my update?? I’m re-posting the previous update as I suspect I’m not the only one with this issue that needs investigating.
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THE RE-POST
Now then continuing here on the problem of the alarm and original Alarm error code 098.BMS Over Voltage is still an issue. As demonstrated the firmware update was only available to one of the two B300s batteries and rather than fix the 098.BMS Over Voltage issue it just damaged the 1xB300s that was running an earlier BMS firmware.
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I have now done some other tests on connecting the remaining 3xB300 and 1XB300s to try and narrow down what is happening for the AC500 to continue to produce the 098.BMS.
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I connected the 3xB300 only and used PV to fully charge. Bingo no 098.BMS error code and all good. This is repeatable.
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I then connected the 1 xB300s to fully charge on its own without the 3xB300. Again Bingo no 098.BMS error code and all good. This also is repeatable.
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However then as before when the 1 x B300s is connected on the first chain port and the 3 x B300 in series on the second chain port and charge to 98% to 100% it triggers the Alarm error code 098.BMS Over Voltage. As you can see the 098.BMS alarm is only against the 3 x B300 individually but not against the 1 x B300s. There are no issues with the 3xB300 as they work fine with the AC500 without the 1 x B300s connected. But for some reason the two types together trigger the 098.BMS against the 3 X B300 only
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This is the exact same repeatable result if 2 x B300 + 2 x B300s are connected, so it is NOT due to 3 x B300 +1 x B300s numerical configuration of battery types
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It’s worth noting that the B300s always lags behind the charging of the 3 x B300, so the 3 x B300 will reach 100% whilst the 1 x B300s lags behind at say 95%. It is only when the 1 x B300s reaches 98% to 100% that the 098.BMS alarm triggers against the 3 x B300.
This seems to imply some sort of compatibility issue? Everything works fine but is this safe? The alarm which keeps coming on and off as the unit fluctuates around 98% to 100% is quite disconcerting! Can a firmware update to the AC500 fix this?
Your response and assistance is much appreciated
Dean

[BLUETTI_CARE]

@Deano I think I may have done something wrong. Could you please take a photo to show the BMS version of the four batteries? The tech team replied that we can try to upgrade the firmware of B300.

[Deano]

Hi, Thank you for getting back to me.
I have already attached a screen shot of the firmware for the B300 earlier in this thread. I’m conscious that the last firmware update was for one of the two attached B300s which made it defunct. However as requested attached is a photo of the now attached 3 xB300 + 1 x B300s. Please note all the 3 x B300 have the same firmware number 1014.10

Please can you post a thread here when you have released an update
Thanks
Dean