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High Bus Voltage Error on MUST 5KVA Inverter


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Hi there

I am having issues with my MUST inverter periodically showing error 8 - High Bus Voltage Error code. Herewith my setup below:

2. 12x 330W Canadian Solar Panels
3. 2x Pylontech US3000 batteries

We have had no power due to a fault for a few weeks, so have been running on panels during the day and batteries at night. I have noticed that if i turn over to generator at the end of the day, after the batteries are charged (needed to run my stove), the error comes up on the inverter after about an hour or two of running the generator. Yesterday we had our grid power restored in the afternoon after the fault was repaired. In the evening when batteries were fully charged and still on grid power, the error came up again. Had to restart the inverter and switch off grid power, so that batteries were no longer charging. 

Any suggestions as to what I can try?

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