How do IEC ratings influence solar panel durability against hail?

Understanding IEC Hail Impact Testing

IEC 61730 and IEC 61701 are the relevant standards for testing the durability of solar panels against hail. These standards outline the procedures for testing panels against hailstone impacts, simulating real-world hail conditions. Panels are tested with hailstones ranging from 25 mm to 70 mm in diameter and weighing between 0.25 kg/m² and 1.25 kg/m², with velocities between 30 m/s and 50 m/s.

IEC Ratings for Hail Resistance

IEC ratings for hail resistance are typically denoted by the “H” classification, with “H” being the lowest and “H2” being the highest. Panels that meet the requirements for the “H2” classification can withstand impacts from 70 mm hailstones at 50 m/s, while those meeting the “H” classification can withstand impacts from 25 mm hailstones at 30 m/s. The IEC ratings provide a clear indication of a panel’s durability against hail damage.

Real-world Implications of IEC Ratings

In regions prone to severe hail storms, choosing solar panels with high IEC ratings is crucial to ensure their longevity. For example, in the United States, hail storms can occur in states like Texas, Colorado, and Wyoming. In these areas, selecting panels with an “H2” classification can provide an additional layer of protection against hail damage, minimizing the risk of costly repairs or replacements.