Solar Access Calculator

Calculate the percentage of available solar resource reaching the array accounting for shading obstructions over the year.

Input Parameters

Results

--
Solar Access
%
--
Tilt Factor
--
Azimuth Factor
--
Effective Irradiance
%
Note: Solar access of 95%+ is desirable for PV systems. A solar pathfinder or shade analysis tool provides accurate site-specific data.

Reference

Optimal Tilt ≈ Latitude × 0.9 Tilt Factor = 1 − 0.002×Δtilt − 0.00005×Δtilt² Azimuth Factor = 1 − 0.002×Δaz − 0.00003×Δaz² Solar Access = (1 − Shade%) × 100 Effective Irradiance = Tilt Factor × Az Factor × Solar Access