Can Solar Panel Systems Be Designed To Handle Heavy Snow?

Designing for Snow Load

When designing a solar panel system for areas with heavy snowfall, it’s essential to consider the snow load, which is the weight of the snow per unit area. In the United States, the snow load is typically classified as follows: 20 pounds per square foot (psf) for areas with moderate snowfall, 30 psf for areas with heavy snowfall, and 40 psf for areas with extreme snowfall. To ensure the system can handle the snow load, designers can use specialized mounting systems, such as those with a high wind load rating, to secure the panels and prevent damage.

Snow Load Calculations

To accurately calculate the snow load, designers use a formula that takes into account the roof slope, roof size, and local climate conditions. For example, the International Building Code (IBC) provides a formula for calculating the snow load: w = (C_d * S_w * h) / r, where w is the snow load, C_d is the load factor, S_w is the wind speed, h is the roof height, and r is the roof slope. By plugging in the values specific to the location, designers can determine the required snow load and design the system accordingly.

Panel and Mounting System Selection

When selecting solar panels and mounting systems for areas with heavy snowfall, it’s crucial to choose products that can withstand the snow load. Panels with thicker glass, such as those with a 40-millimeter or 50-millimeter thickness, can provide added strength and durability. Additionally, specialized mounting systems, such as those with a high wind load rating, can secure the panels and prevent damage. Some popular mounting system options for snow-prone areas include ballasted racking systems and fixed-tilt racking systems with a high wind load rating.