Hi,
I’m running an AC300 and two B300 batteries attached to it (not chained). The system is in 24/7 use with constant loads attached (IT) and with ECO OFF.
After a while of flawless operation using both AC and PV inputs, the system started to exhibit a strange behavior: It started to randomly turn off AC out, switching it back on one or two seconds later and therefore crashing all attached IT equipment every time. Intervals were between minutes and 2-3 hrs. Both batteries were well charged at the time and AC in (230V 50 Hz (EU/DE)) was available, too. So no apparant reason.
In the error logs, I found this (with info from the manual):
01 006 – SPS Voltage Low-Hardware (Please contact with the dealer if the error still exists after rebooting the unit.)
I tried rebooting the system at least two times with no success, the random AC shutdown was still happening. I expected the error log to fill with more entries, but no.
I planned to post about this in this forum. In the meantime, I turned off AC completely and bypassed the unit (running my IT directly without the AC300), keeping only PV-in and DC-out active. This worked for two days, charging a phone and a laptop using USB-C from the AC300 itself. Then the system started clicking wildly every few seconds, turning on and off DC the same way it did AC before. That is when I gave up, I turned off the AC300 system completely.
Then I remembered, that both B300 batteries had a SoC of more than 80%, which is unhealthy to keep for a longer time. So I thought: These batteries CAN operate stand-alone w/o the AC300 when using DC in/out only. So I disconnected the B300 batteries from the AC300 and tried to use them as individual DC power banks. But no matter which of the B300 I turned on: Both showed a high SoC (by status LEDs), but didn’t output any power using 12V out or USB-C out (with the same load on USB-C I was using on the AC300 port before and a 12V adapter staying completely dark instead of showing 12V input as it should).
Now I’m lost!
Do I have three faulty products? Or just a faulty AC300? Or two faulty B300? Why isn’t there any output from the stand-alone B300 batteries?
I hope someone here can help.
Hello, just to better understand if the B300 can be excluded from the problem: when you used the B300 to power your equipment and turned on the DC from the battery, did the green LED on the button light up?
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About the AC300 error that seems to be related to the SPS rail, which is the internal low-voltage DC power of the M boards, I believe that you should contact the support to evaluate a replacement.
But first please state your firmware versions and check if you find any update from the App by connecting via bluetooth.
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.