Quick Answer
An IEC 61730/61701 rating of Impact Hail Class (IHC) II indicates better hail resistance for solar panels compared to a rating of IHC I.
Understanding Hail Resistance in Solar Panels
When it comes to solar panels and hail damage, the International Electrotechnical Commission (IEC) provides a rating system to ensure panels can withstand various environmental conditions. The IEC 61730/61701 standard is used to test solar panels for their ability to withstand hail impacts. The impact hail class (IHC) rating is based on the panel’s ability to withstand hailstones of different sizes and velocities.
IEC Impact Hail Class Ratings
The IEC 61730/61701 standard has two primary impact hail class ratings: IHC I and IHC II. IHC I requires the panel to withstand hailstones with a diameter of 25 mm and a velocity of 23 m/s, while IHC II requires the panel to withstand hailstones with a diameter of 35 mm and a velocity of 24 m/s. As you can see, IHC II has a higher requirement for both hailstone diameter and velocity, making it a better indicator of hail resistance.
Choosing Solar Panels with Better Hail Resistance
If you live in an area prone to hailstorms, it’s essential to choose solar panels with a high IHC rating. For example, a panel rated with IHC II can withstand hailstones that are 40% larger in diameter and 4% faster in velocity compared to a panel rated with IHC I. When selecting a solar panel, look for the IEC 61730/61701 certification and check the impact hail class rating to ensure you’re getting a panel that can withstand harsh weather conditions.
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