Look at the above graph and see if you see what I see. On Sept. 1, the panels looked dirty so I washed them on Sept. 2. See the kilowatts produced went up 2 units? Now on Sept. 22, I saw the panels were dirty and so the units produced seems down 2 units each day since. I have not washed them yet and will hopefully next Saturday, Oct. 2nd. We will see if the units go up 2 units again.
By the way, the graph is low for today since the day of sunshine is not yet over.