Hi @mas1701, We are very concerned about the issue you’re experiencing.
The AC300 is displaying error code 01 006 – SPS Voltage Low, which appears to be a hardware-related fault. A return and repair will need to be arranged.
Regarding the two B300 units failing to provide DC output, we’d like to know:
Can these B300 batteries charge independently? Is the ambient temperature within an appropriate range, or is it too cold or too hot?
Before the issue occurred, were there any thunderstorms, power outages, or similar events?
We look forward to your reply.
We appreciate @ndwr’s kind help!
Hi ndwr,
many thanks for your reply. The part about B300 DC out was my fault. The B300 batteries are not in plain view of sight (a bit hidden behind other stuff), so when I plugged in my DC components, I didn’t notice the small DC on/off button at all. And I also overlooked it’s presence in the manual, where it is labeled, but w/o it’s own “usage” section. Still, fool on me.
So B300 part of the problem solved and nerves calming down, just one component with problems.
Thanks again.
Hi BLUETTI_CARE,
sorry for the B300 issue, that part was my fault. I never used the DC out ports of the B300 batteries directly before and those batteries are somewhat hidden from view, so I just missed the additional step of pushing the “DC on/off” button. This is solved, DC components are now working, Voltage out on the 12V ports shows a bit over 13V which should be fine.
As for the AC300 problem:
All components are in my living room / IT room (2x B300 a bit hidden, AC300 fully visible), so indoors at ambient temperature (I also have a portable split AC system). There were no previous environmental effects like power outages or thunderstorms in the days before the event.
The system is powered by AC 230V 50Hz (DE) and 4 rigid solar panels within specifications (2 MC-4 circuits, 2 panels in a row, each 430W peak per panel). It is fine-tuned to charge using AC when there is no PV input, but AC power is typically cheap and to discharge when AC power is typically expensive (in preparation for daytime-based billing). SoC limits are set to keep the unit in healthy battery regions. This is why I wanted to use some DC power directly: To not keep the batteries at high charge for a prolonged time while the AC300 is off.
The DC out feature isn’t used a lot, but AC typically has a constant load between 600 and 1200 Watts with some exceptions. but rarely more than 2000 Watts. It is mainly IT equipment. The system has been running in this configuration (with solar) for about 9 months. This is when solar and a second B300 were added.
Shortly after the last changes (solar and second B300), all firmware was upgraded to the latest versions, which solved some previous problems. I never requested any specific firmware versions / patches, it should all be the default Bluetti provides.
If I need to return the AC300, it’ll not be easy for me to ship. But please, provide instructions on how to proceed further. Every day not using solar power in the summer is a day wasted. 
Thanks a lot for your assistance.
Hi @mas1701, Thank you for the update. We’re glad to know that the DC output of the B300 is normal.
Regarding the issue of the AC300 randomly turning off the AC output, could you please take a video when the problem occurs, upload it to Google Drive, and share the link with us? This situation is indeed very rare.
Meanwhile, please tell us the SN number and the current firmware version of your AC300+B300 set. We also hope to push new firmware to solve this problem, because it’s really inconvenient to send it back for repair, and it will take some time for the logistics and repair process.
It’s the weekend coming up. We wish you a pleasant weekend in advance. We will reply to you with the latest information next Monday.
Hi @mas1701, We still haven’t gotten your answer, we wonder if this problem is resolved.
Our engineers are very concerned about the issue you encountered. They suggest you contact the customer service and repair it.
Please feel free to contact us if you need more help.
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Hi,
thanks for keeping in touch. Unfortunately, I have yet to find the time to follow your last advice and make that video. I of course intend to do so ASAP, but my personal health sometimes gets in the way. Far too often I’m afraid. Thanks for being patient with me. I’ll get back to you as soon as I have the chance.
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Hi @mas1701, I’m so sorry to hear that. I hope you recover soon, and please take good care of yourself.
We’ll always be here waiting for you.
Hi Bluetti Support,
So after nearly two years of flawless 24/7 operation, the slave unit in my split-phase AC300 system started exhibiting the exact same problem yesterday, spontaneously turning the AC output off and then back on again - within a second or so - at least a dozen times within a span of a few hours (it also triggered a reset of the master unit every time, of course) …
The slave unit alert history shows 006 SPS Low Voltage Errors each time (the master unit only shows the 024 Phase Integration alerts, which are normal, I suppose).
I believe the consensus by now is that the 006 errors are clearly (or mostly) hardware related (one of the related community threads on this mentions a blown capacitor). The fact that my master and slave units are of the same vintage and the same firmware versions and still the master is perfectly fine seems to support this as well.
Luckily, I happen to have a 3rd (standalone/spare) AC300 which I’m using as the slave in the split-phase system now after swapping out the defective unit.
Could you please kindly contact me directly to discuss the next steps? The units (including the one in question) were purchased from Bluetti Japan in Sep 2022 (I have the order and serial numbers but wouldn’t want to publicize them here).
I could open a support ticket with Bluetti Japan but would rather avoid the rigmarole of having to explain the whole story and why a firmware upgrade would most probably not solve anything - all in Japanese …
Appreciate your help, as always.
-Gabriel
@BLUETTI
Could you please advise on the best way to expedite the resolution of this issue (above)?
Happy to open a case with Bluetti Japan if that helps kickstarting the process
Many thanks.
Just an update, for the record:
Did a full firmware upgrade of the AC300 in question to all latest publicly available firmware (picture below), to no avail.
Also did a load test under a constant 520W load and it pretty consistently reset the AC output every 11~12 minutes. Hope it helps with your diagnostics just in case you are still wondering the cause of the issue.
Opened a case with Bluetti Japan.
Hi @gbk, I’m sorry I’ve been busy lately and didn’t notice your message in time.
This does seem unusual. Since you’ve already contacted us, could you please let us know your service ticket number? We’ll analyze the existing information and arrange an upgraded service for you. Hope this helps.
Hi @BLUETTI_CARE,
No problem at all. Appreciate your help.
The Bluetti Japan case number is: 425677.
Their initial reply, received a short while ago, suggested the usual things (update to the latest firmware, reboot with all loads disconnected, etc.) which of course I have done already …
Awaiting your instructions on the next steps (happy to continue the conversation on the Bluetti JP support thread).
Thanks very much once again.
Hi @gbk, Thank you for your kind understanding.
We have located your email records. We also understand your requests and have reminded the email support team to follow up according to the following requirements:
- Respond in English instead of the default Japanese.
- No need for further troubleshooting. Since you’ve confirmed it’s a hardware issue with the AC300, we will directly arrange warranty service.
- We have also urged the email support team to review the post and collect valid information to avoid repeated inquiries.
- Prioritize handling your case.
Hope this helps. Please feel free to contact us if you have any other needs.
Thank you very much for the arrangement and your continued, professional support.
I’ve been contacted by Bluetti Japan today, following their generic initial reply a few days ago.
Will take it from here with them …
Once again, much appreciate your assistance.
Hi @gbk, Thank you for the update. It’s possible that the staff member is new and lacks sufficient experience, which prevented them from providing you with comprehensive service.
However, please rest assured that we have reminded them to arrange the upgrade service for you.
Please feel free to contact us if you need our help.
Hi @BLUETTI_CARE ,
Unfortunately going to need your help once again.
The AC300 unit of my split-phase system that broke early July was deemed unrepairable by your Japan Service Center and I received a refurbished unit as replacement. This refurbished replacement unit has been showing “108 Fan Fault” every 15~20 minutes, ever since I turned it on.
Contacted your JP Service Center once again on Monday (included pictures) but haven’t received any reply since (it’s Thursday). The case number is still the same (#425677).
Appreciate if you can look into the matter.
Regards,
Hi,
Any chance your JP Customer Service will get back to me?
They sent me a refurbished AC300 unit as replacement for the one above which had the 006 errors but the replacement AC300 has - what appears to be - a fan and/or temperature sensor issue, out of the box.
Thank you.
Hi @gbk, We apologize for not seeing your message in a timely manner. We notice that the Japanese customer servicer has replied to your email.
Please rest assured that we will cover the shipping costs. We have also instructed our staff to give priority to following up on this matter.
Thank you very much for your feedback and the arrangement.
I’ve sent the AC300 unit back to your JP Service Center today.
Provided the tracking number in the related private thread a short while ago.
Once again, appreciate your continued attention to the matter.
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Hi @gbk, you are welcome!
It’s my pleasure to help you!
We hope everything goes smoothly from here!
Please don’t hesitate to contact us if you need our assistance.