The free standing tubs (Renusole Console+) or the metal framwork (Van Der Valk flat roof mounting) are weighted down using ballast blocks according to the manufacturers calculations based on the height of the building, solar panel size and wind zone,. These ballast calculations are tested in a wind tunnel by the manufacturers.
Just being weighted down can sound a bit scary but it's almost impossible for one person to move them once the ballast is in place.
We only use ballasted systems to avoid penetrating a flat roof.
As discussed above. The best pitch is 30 degrees when facing due South. 10 degrees when facing East or West.
Solar panels on a flat roof should lie flat as this would stop them being self-cleaning when it rains.
If the manufacturers specifications have been followed and the correct ballast has been used then high winds shouldn't affect the panels.
An example of this is the fact that a solar panel coming off a roof would be huge news for the climate & technology sketical media yet there hasn't been any stories to that affect despite 100,000's of ballasted flat roof solar panel systems being installed worldwide.
Most roof warranties are compatible with ballasted flat roof mounting. Fixing into the substructure and pentrating the roof may affect the warranty as the original manufacturer can not longer be certain of watertightness. It's worth checking with your roofing product manufacturer.
For this reason, we only use ballasted systems unless requested otherwise.
If the system extends beyond the ridge or edge of the roof by 200mm then yes, you will require planning permission. We can model this for you let you know if the panels would extend above the ridge.
A lot of flat roofs will not require planning permission - most garages, dormer extensions and flat roof extensions will not require permission.
Here in Brighton & Hove - a recent flat roof on a dormer extension (picture above) required planning permission as it extended above the ridge of the roof. Planning permission took 2-3 months.