Error codes 011 and 012

I bought the AC300 with B300 in April 24. I have only tried to use it for emergency backup when grid power is down. I keep getting the error codes 011 and 012 Bus voltage high. Has anyone else experienced this and what could be causing it?

Hi @Murph, Can you tell us which country you live in, and if you have connected the AC300 to the home distribution panel directly?

The 011/012 H Bus voltage is too high indicating a hardware BUS overvoltage. During the process where the inverter converts DC to AC power, the voltage needs to be raised to a high level before being converted into AC through a full-bridge circuit. This high DC voltage is referred to as the BUS voltage.
The occurrence of a BUS overvoltage fault may be due to specific inductive loads. When encountering loads with significant surge power fluctuations, such as air conditioners or printers, these loads can cause the BUS voltage to fluctuate drastically, leading to an inverter fault. We have developed new firmware to adapt to these special loads and prevent such faults.

Another possible cause could be that the portable power station was directly connected to the home distribution panel. We recommend that customers upgrade to the latest DSP firmware and install a Transfer Switch to isolate the connection before using it, otherwise, the error will persist.