Analysis: Inverter has faulty on Boost circuit
Solution: 
1. If it only happened in a bad weather(such as: in the evening or morning); but other times are normal, so the problem probably be caused by the insufficient input power,  it’s a normal phenomenon; please wait for weather becoming better, the machine will automatically recover and generate power again, please ignore this situation.
2. Check if the inverter’s DC side connection is correct, check if the DC voltage is in rated range
3. Restart inverter (disconnect DC&AC switch, wait for 5 mins, then turn it on), observe if it can return to normal running.