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Wind Load on Module

Wind pressure and force on a module per IS 875-3.

Mechanical

Core inputs only — quick sizing with engineering defaults.

Inputs (SI units)

Basic wind speedm/s

Module aream²

Pressure coefficient-

Combined k factor (k1·k2·k3)-

Results

Design wind force

4,196 N

Wind pressure

1,162 N/m² (1.16 kPa)

Force per anchor (4 pt)

1,049 N

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Engineering Formula

V_z = V_b × k1 × k2 × k3
p_z = 0.6 × V_z² [N/m²]
F = p_z × A × C_p [N]

IS 875 (Part 3) uses design wind speed corrected by risk (k1), terrain (k2), and topography (k3). Dynamic pressure follows the Bernoulli-based 0.6 constant for air at sea level.

Step-by-step Calculation

1.VzVb·k1k2k344 m/s
2.Pressure0.6Vz²1,162 N/m²
3.Forcepz·A·Cp4,196 N

Design Assumptions

• Air density 1.225 kg/m³.
• Cp for tilted PV panels ≈ 1.2–1.8 (up-lift dominant).

Engineering Tips

◆Anchor cable ties every 300 mm along frames.
◆Use dynamic gust factor for spans > 6 m.

Warnings

▲Coastal zones need Cp up to 2.2 — check IS 875-3 Table 4.

Standards & References

IS 875 (Part 3):2015ASCE 7-22IEC 61215 §10.16

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