The IEC61215 covers the parameters which are responsible for the ageing of Photovoltaic (PV) modules. IEC61215 certification includes all forces of nature. The following forces of nature are included:
1. Sunlight including ultraviolet radiation.
2. Climate (changing of climate, coldness, warmth, humidity).
3. Mechanical load (hail, wind suction, wind pressure, snow parameters which are responsible for the ageing of Photovoltaic modules).
2400 Pa uniform load applies for the standard IEC 61215 certification.
But when you install solar panels in areas with heavy snow, an increased load capacity of 5400Pa is advisable! This uniform has been included in the IEC 61215 ed. 2.