Quick Answer
Solar panels with higher IEC ratings generally perform better in storms due to their increased resistance to extreme weather conditions, including hail. However, even high-rated panels can be damaged by large hailstones or high-velocity impacts.
Understanding IEC Ratings for Solar Panels
The International Electrotechnical Commission (IEC) publishes standards for testing solar panels, including their resistance to hail. The IEC 61730 and IEC 61701 standards assess the performance of solar panels under various weather conditions. A higher IEC rating indicates a solar panel’s ability to withstand extreme weather conditions, including hail.
Hail Resistance and IEC Ratings
To evaluate the hail resistance of a solar panel, look for the IEC 61701 rating. This standard tests solar panels at a speed of 23 m/s (approximately 51 mph) with hailstones of 25 mm (1 inch) in diameter. Solar panels with higher IEC ratings can withstand more hailstones before suffering damage. For example, a solar panel with an IEC 61701 rating of 25 mm can withstand impacts from 5-6 hailstones of 25 mm in diameter, while a panel with a lower rating may be damaged more easily.
Techniques for Assessing Hail Damage
When assessing hail damage to solar panels, look for signs of damage such as cracks, breaks, or shattered glass. The severity of damage depends on the size, speed, and angle of impact. Solar panels with a higher IEC rating are designed to minimize damage from hailstones. However, even high-rated panels can be damaged by large hailstones or high-velocity impacts. Regular inspections and maintenance can help identify and repair damaged solar panels.
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