Quick Answer
Installing solar panels at a steeper angle, typically above 30 degrees, can reduce the risk of hail damage by allowing hailstones to slide off more easily. This is because a steeper angle increases the likelihood of hailstones bouncing off the surface rather than sticking to it. However, this benefit must be balanced with reduced energy output.
Maximizing Angle for Hail Resistance
A steeper installation angle is crucial in areas prone to hailstorms. Research indicates that a minimum angle of 30 degrees is necessary to significantly reduce hail damage. However, steeper angles may also compromise energy output, so a balance must be struck between the two factors. In practice, a 35-degree angle is often cited as an optimal compromise for regions with a high risk of hail damage.
Hailstone Size and Impact
Hailstones of varying sizes can cause damage to solar panels. The impact of a hailstone on a solar panel is influenced by its size, speed, and angle of impact. Smaller hailstones may cause surface damage, while larger stones can penetrate the panel and cause more extensive damage. A steeper installation angle can help mitigate this damage by allowing smaller hailstones to slide off and reducing the impact of larger stones.
Practical Considerations
When installing solar panels in areas prone to hailstorms, consider the local building codes and regulations. In the United States, for example, the International Building Code (IBC) requires solar panels to be resistant to the local hail severity index. This involves testing the panels to ensure they can withstand hailstones of a specific size and speed. Homeowners and installers should consult local authorities to determine the required hail resistance standards for their specific region.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.