All Calculators
💨

Wind Energy Output

Estimate turbine power, annual energy production, and capacity factor using Weibull wind statistics and IEC 61400-12-1 power performance guidance.

Site Wind Resource

m/s

Use measured annual average at hub height.

—

k=2 approximates a Rayleigh distribution.

kg/m³

Adjust for altitude/temperature.

h/yr

Turbine & Power Curve

kW
m

Radius is diameter ÷ 2.

—
—

Drivetrain + electrical efficiency.

m/s
m/s
m/s

Loss Assumptions

%
%
%

📖 How to Use

Enter hub-height wind statistics, turbine characteristics, and loss assumptions. The calculator builds a simplified power curve between cut-in, rated, and cut-out speeds, integrates against a Weibull distribution, and subtracts losses to estimate annual energy production.

🧮 Formula Reference

Power(v) = 0.5 × ρ × A × v³ × Cₚ × η
Weibull scale parameter c = V_mean / Γ(1 + 1/k)
AEP = Σ Power(vᵢ) × hours(vᵢ) (0.5 m/s bins)
Capacity factor = AEP ÷ (Rated Power × Hours)

⚠️ Notes

  • Use manufacturer power curves for bankable estimates; this tool approximates the curve using Cp and rated limits.
  • IEC 61400-12-1 prescribes measurement setups for certified power performance tests.
  • Adjust loss percentages for site-specific wake interactions, icing, grid curtailment, or environmental shutdowns.

🔗 References