Answer:

This can occur on days with a blue sky and variable cloudiness. The solar panels are then hit by both direct sunlight from the sun and also by reflected light from white cloud edges near the sun. Before and after the sun is covered by clouds, the power can increase up to approximately 120% of nominal maximum power. This results in a very characteristic appearance of the production curve, where it can rise sharply before the sun is covered by clouds.

Production curve from roof-mounted and south-facing solar panel installation. After a relatively clear morning, there is variable cloudiness during the afternoon. Before and after clouds pass near the sun, the power from the solar panels increases by up to 20%.

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