With the top switch button, you can display the advice of the App or choose to display a customized setup by changing the values. The App recalculate the result instantly.

On a flat roof, it is desirable that the rows of solar panels are not in each other's shadow throughout the year. So the sun angle in the winter is of importance in the calculation of the distance between rows of solar panels because the sun is then at its lowest. The App calculates and displays a setup by placing the rows so that they are not in each other's shadow throughout the year. 


You can add or subtract solar panels, which can not be placed due to any skylights and chimneys.


The width and the length of the required surface does not include the distance of the eaves. The regulations for the required distance to the eaves varies by country.