What is the ticking noise coming from my inverter?

Your inverter needs a minimum amount of solar irradiation in order to be able to start up and function properly. When the sun rises in the morning, the inverter will make several attempts to start itself up. The ticking noise you hear is the inverter switching on and off. After a while it will start up properly and the noise stops.

This process will occur daily. How long it takes will depend on daylight conditions. On very cloudy days with low irradiation or when the modules are covered in snow, you may hear this sound during the day as well.