PV output fluctuation

[JohnKl]

See attached. Thoughts? The smooth drop and recovery not surprised as i have 3 rows of panels gradually getting shaded as the sun sets.

What's up with the other one? At one point wattage even went above my max i should have ever gotten from panel spec. Panels overheating? Thoughts?

 

[jgh]

Clouds. Both blocking and reflecting - yes, that's a nice effect and when combined with a cold panel can take it's output above the specsheet peak rating.

 

[JohnKl]

Yes, i do remember seeing sporadic clouds that day. Makes sense. Thanks. Overall that day generated less power so lower average power as expected but still surprised that clouds caused that much higher peak power. Wish the app would plot voltage as well.