Fire can be caused, for example, by the use of different connectors within a PV module, flammable materials or incorrectly cut cables.
If installed incorrectly, the wind may get a grip on the solar panels, causing them to come loose or even be blown away.
Metal parts of solar modules may come under voltage. This can cause danger to the installer, for example, who may receive an electric shock.
Incorrect installation can lead to damage to the roof and leaks.