Here’s a general procedure for cleaning and removing dust from inside an inverter:
Turn off the AC and DC switch: Ensure the inverter’s DC and AC switch is off.
Remove the fan: Use a screwdriver to press the fan’s fastening straps towards its center. Then, pull the fan unit out of the housing.
Clean the fan and enclosure: Use a soft brush to clean the fan and the enclosure opening.
Check ventilation: Ensure the inverter’s ventilation system is clear.
Fix everything and turn on AC and DC switch.