Solar Panel Wind & Snow Load Calculator
Estimate combined wind and snow design pressure, identify the governing load case and calculate per-module forces for ground-mounted solar arrays in seconds.
Enter your site parameters.
Results update instantly as you type. Use the defaults for a quick example, then replace them with your project data.
Design loads
Step 02Preliminary service-level loads only. Apply the governing code’s load factors, exposure, height, topography and importance coefficients for final structural design.
How the calculator works.
The calculator estimates combined load on a tilted PV panel in three transparent steps.
Calculate wind pressure
Velocity pressure is calculated from basic wind speed using q = 0.613·V² and multiplied by the net force coefficient Cf for an open-frame ground-mounted array.
Reduce snow for slope
Ground snow load Sg is reduced by panel slope: full retention up to 30°, decreasing linearly toward zero at 70°, then projected onto the panel surface.
Select the governing case
Full wind plus reduced snow is compared with reduced wind plus full snow. The larger result becomes the governing preliminary design case.
Where the ψ factor comes from.
The default combination factor ψ = 0.70 is based on a joint wind–snow hazard study using multi-decade meteorological records from stations across China. The study paired daily maximum wind speeds with snowpack events and evaluated structural response in a 100 m PV support array.
Across four data-pairing methods, combination factors for column axial force and main-beam bending moment ranged from roughly 0.55 to 0.85, with medians near 0.65–0.70. Read the full methodology in our article on determining wind and snow load combination factors for PV panels.
Frequently asked questions.
Use this calculator for early-stage comparison and racking selection, not as a substitute for stamped structural design.
Is this calculator a substitute for structural design?
No. Final design must apply the load factors, exposure and height coefficients, topographic effects and importance factors of the governing code—such as ASCE 7, EN 1991, GB 50009 or AS/NZS 1170—and be verified by a licensed structural engineer.
Why not simply add full wind and full snow loads?
Peak wind and peak snow are statistically unlikely to occur at the same moment. Adding both full values can overestimate the combined load by 30% or more. Structural codes address this through combination factors such as ψ.
What racking should I use in high-wind or heavy-snow regions?
Luminvolt’s utility-grade ground mount systems support reinforced pile foundations and heavier rail sections. Our roof mounting systems also include ballast and wind-deflector options for exposed flat roofs.
Need a load-verified mounting design?
Send our engineering team your wind speed, snow load, module dimensions and site information for a project-specific racking recommendation.