I wonder how they deal with panel failures. It's very hard to find stock of the same panel as was bought last time and as I understand it, you need a to have the panels in your series string quite closely matched, can't just throw any old replacement in there.
Actually, it's likely not a big deal on that scale. If one panel in the whole plant fails, then just make that string have 1 less panel, if a bunch of panels fail, just replace one whole string with whatever new panels you can source and use the remaining same type panels as spares in the strings with failures.