@yousha Sorry for my late reply. We will push a firmware for you to test.
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Hello, I have the same issue; everything is up to date.
@Xenios81 May I have the SN and firmware version (including battery packs) and I can check more details?
Hello, AC500 serial number: AC5002242001052989;
loT: v9041.03
ARM: V4048.02
DSP: V4047.06
Battery pack (both b300s, 1022.09)
@Xenios81 We will push the firmware DSP 4047.08 for you in 12 hours. You can update the firmware to test if the problem can be solved.
Hello, @BLUETTI_CARE
same problems here, again.
Please find a solution because the system is not usable properly in this conditions.
Hello, Same issue on a new unit.
can you send me the latest firmware???
here you are my data:
Model: AC500
SN:2242000572053
DSP Version 4047.06
ARM Version 4048.02
HMI - Version 6052. 04
best regards
Andrea
Hi @BLUETTI_CARE, I’m getting the same 012 BUS Voltage High error and found out the following:
When connected to the grid, but with AC output turned off, it will charge the battery.
When connected to the grid, and with nothing connected to the AC output, when I turn the AC output on, I get the 012 BUS Voltage High error
When NOT connected to the grid, but with other stuff connected to the AC output, it will turn on and run fine until the battery is empty.
My firmware versions:
IoT: v9041.06
ARM: v4048.02
DSP: v4047.06
BMS: v1022.09
Serial number: AC5002310000527093
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@BLUETTI_CARE, same 012 BUS Voltage High error
DSP Version 4047.03
Please send firmware update
AC500 SN:224000890472
@BLUETTI_CARE, same 012 BUS Voltage High error
DSP Version 4047.03
Please send firmware update
AC500 SN:224000890472
Hi @Bikerwally, we consider your AC500 to be an EU version, is that so?
We have pushed the new DSP v4047.30 to all EU version AC500. Can you find it and upgrade directly? I think it does help.
Hi, it is an EU version. I have two AC500.
The oldest one has DSP v4047.06 and is working fine.
The latest one AC500224000890472 with the same DSP version gets the “012 BUS Voltage High error” since a couple of days.
I don’t see the firmware upgrade when connected to bluetooth.
But I found out that AC is working when I switch on DC first.
After that I can switch off DC and AC stays on.
Hi @Bikerwally, We have tried to search your SN code AC500224000890472 in our system but it does not exist. Can you take a photo to show us the SN code? We will check if there is any mistake.
Meanwhile, I’m afraid that you might be directly connecting to the AC500 via Bluetooth without logging into your Bluetti account and binding this AC500 to it. If this is the case, you won’t be able to complete the firmware upgrade. A direct Bluetooth connection only allows limited operational access and does not include firmware upgrades.
Please register and log in to your Bluetti account, then bind your AC500. Next, click on ‘Settings,’ then ‘Firmware Upgrade,’ and click on the DSP icon to obtain the latest firmware. Proceed with the upgrade afterward.
Please do not load any device when upgrading it.
Please let us know if it works.
Hi, managed to upgrade the firmware, see photo with SN.
Though it’s still the same, when AC load is applied, the same error apears and AC switches off.
It does work when I first switch on DC.
But now the machine doesn’t connect to the network anymore, only by bluetooth.
Just managed to reset WiFi so that’s working now.
I see there was one figure missing from the SN in my earlier posts. Sorry for that 
The “The BUS voltage is high” has bitten again.
And my AC500 is an EU-Version too.
But I did not get a new Firmware:
Is it possible to provide a new one for me?
@BLUETTI_CARE
Where @Bikerwally has stated the problem is resolved?
Please don’t construct a parallel reality…
I can bypass the problem by activating DC before activating AC.
Like this AC stays on and the high bus voltage error does not appear.
Then I switch DC off again.
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