Test Result Spotlight
The glass breakage rates from Kiwa PVEL’s hail testing of almost 300 PQP modules is shown below, separated by 2.0 mm glass//glass and 3.2 mm glass//backsheet modules. The reduced hail durability of glass//glass modules is quite stark, with a breakage rate of 89% with 50 mm hail compared to 40% for glass//backsheet modules. Only the rear-side glass broke on 40% of the glass//glass modules that experienced glass breakage. The rear glass layer is typically weaker than the front due to the need for junction box holes and, in some cases, the colored ceramic fritting applied to the glass areas between cells to increase front-side power output.
