Green Roofs And Solar Panels


It is an incorrect assumption that solar panels will deliver increasingly higher efficiency with an increasing outside temperature. Solar panels deliver their maximum efficiency at 25 degrees Celsius, while after that the efficiency decreases by half a percent with every degree of temperature increase. This invalidates the generally accepted rule that the warmer it is, the more power generated by solar panels. Unfortunately this is a fable.

Especially in the summer, the temperature on a flat roof covered with roofing felt can rise considerably to 60 to 70 degrees. If you want an optimal return for your solar panels on a flat roof, it is therefore important to cool the environment. But how do you manage this without consuming more power? The answer is very simple and free of charge, through natural cooling or green roofs. Very logical: the green vegetation around the solar panels cools the temperature of the roof, purely through the evaporation of the plants. These retain water and when evaporation has a strong cooling effect on the immediate environment. This allows the solar panels to optimally convert the sun’s rays into free natural green electricity.

The effect is even greater with flat roofs in inner cities, which become warmer than roofs in the countryside because dense buildings retain heat. In English there is a nice word for the urban heat island effect. Our motto: create your own green roof garden without maintenance or watering. That has many more advantages. The latest planting not only cools the roof in the summer, but now also insulates the roof in the winter. This of course ensures a considerably lower energy consumption.

Finally, your roof will also be happier from a green metamorphosis. The roof covering will last 40 years instead of 20 years, because weathering of the roofing felt by solar radiation is completely canceled. This in combination with the lower energy bill due to insulation and solar power yields. And then we haven’t even talked about less particulate matter and more butterflies and bees. You would almost wonder why gray roofs still exist at all