The van der Valk drainage clip is ideal for fitting to solar panels on flat roofs. Because the tilt angle on a flat roof is usually around 10 degrees, water drains away less easily here. And with the water there is of course always a little sand as well. That sand then builds up along the bottom edge of the solar panels, so the lowest strip of the cell ends up covered by a layer of sand. That is of course not so good for your yield.
With the van der Valk drainage clip you can solve this problem. The clip makes sure the water can drain away faster, so less dirt builds up along the bottom edge of the solar panel!