A: Our system has been tested and passed for 25mm hail stones. The biggest hail we have experienced was in 2012 in Christchurch. This hail damaged clearlite roofing and wrote off cars with pockmarks. In the worst area, we had 5 solar systems and a total of 6 tubes were damaged. It took 1 hour to replace all tubes and these were covered under the insurance from the greater damage to the properties.