Solar Resource Assessment Calculator

Estimate monthly and annual solar irradiance from geographic parameters using clear-sky models.

Input Parameters

Results

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Est. GHI
kWh/m²/yr
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POA Irradiance
kWh/m²/yr
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Peak Sun Hours
hrs/day
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Est. DNI
kWh/m²/yr
Note: Use TMY3 or NSRDB data for accurate local resource assessment. Clearness index Kt ranges from 0.3 (cloudy) to 0.7 (arid).

Reference

Daily GHI ≈ G_sc × Day_hrs × Kt × Lat_factor × Elev_factor / 1000 Annual GHI = Daily GHI × 365 POA = GHI × Tilt Boost Factor Peak Sun Hours = Annual POA / 365 Kd (diffuse fraction) ≈ 1.0045 + 0.04349Kt − 3.5227Kt² + 2.6313Kt³