What should be considered when installing PV on flat roofs?
First of all, it is important to determine whether the roof can bear the additional load created by a PV system. Also consider the possible inclination of the modules due to elevation. This causes additional loads due to the effects of wind, which vary depending on the angle of inclination. If the structure of the PV mounting system cannot be anchored in the roof truss (ridge coupling), additional ballast must also be taken into account to secure the system.
Once all structural issues have been clarified, the next step is to select a suitable mounting system. Leading suppliers rely on two systems here. Since the orientation of the solar modules on flat roofs can generally be freely selected, both systems with south orientation and east/west orientation make sense. To keep the additional load on the roof manageable and at the same time generate good yields, we recommend systems with an angle of inclination between 10° and 15°.
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Differences south and east/west orientation
Mounting systems for PV systems on flat roofs are often available in two versions. Either the modules are aligned and "elevated" only in the south direction, or alternately in the east and west direction.
What to consider when choosing a PV mounting system for flat roofs
In order not to put unnecessary strain on the roof structure, it makes sense to look for a mounting system that is as light as possible. It is particularly important to pay attention to aerodynamics and stability. The wind tunnels also play a decisive role. To ensure that installation is quick, we recommend a system with click technology. Depending on where you mount the PV system, it may also be desirable to choose a mounting system that can be easily dismantled.
Another important point is the angle of inclination. While steeper angles may promise more yield on paper, shading must always be taken into account. If, on the other hand, you mount the PV system completely flat on the roof, more surface area can be utilised. On the other hand, however, there are disadvantages for energy generation, "self-cleaning" by rain and accessibility of the system.
Last but not least: your safety during installation and the safety of the system itself. So opt for an assembly system that places great emphasis on safety. For example, with integrated fall protection, wind tunnel reports and corresponding certifications.
References
Below you will find references for the installation of solar systems on roofs with foil, bitumen and gravel roofing.
Downloads
All information about the TRI-FLAT Easyspeed mounting system for download as PDF.