What are the risks to PV with regards to storms (hail, lightning)

With regards to hail. All solar panels are tested to withstand hail up to 25 mm diameter in size. It is very rare that one gets hail storms with hail larger than that.

With regards to lighting. On all our systems we insist to install lighting protection on both the AC and DC sides of the installation. Additionally one can also install lightning protection on the roof. Solar systems can also be included with your building insurance but must be specified.