Today, I found it strange that with a clear, blue, sunny sky, our solar generation is half of what I expected. I then noticed that one of our two SolarEdge inverters was showing a fault.
I followed the instructions on the Verifying Inverter Status web page on SolarEdge’s website.
I was able to get the details of the Error Log:

I did a quick search for 3x9A System Lock Inverter ARC on Google and discovered on Reddit that it was an issue that many people were experiencing.
I then followed these instructions to reset the inverter on YouTube:
After about 5 minutes, the inverter is now generating power! Hurray all fixed so far.