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Solar Tilt Resource and Yield Comparison

Compare actual tilt and azimuth candidates using interval irradiance or entered modeled yields; retain the tested period, feasible tilt limits and tied results.

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Inputs that matter
Sun and weather intervals, Candidate array orientations, Ground reflectance (%), Sources and assumptions, and 3 more
Output to expect
Compare tilts from sun and weather intervals, Rank modeled orientation candidates
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Compare tilts from sun and weather intervals

Compare actual candidate orientations using interval-average direct normal and diffuse horizontal irradiance, solar position and a stated ground reflectance. This isotropic-sky approximation ranks the entered candidates over the supplied intervals.

POA = DNI × max(cos incidence,0) + DHI × (1 + cos tilt)/2 + GHI × albedo × (1 − cos tilt)/2; GHI = DNI × max(cos zenith,0) + DHI.

Rank modeled orientation candidates

Compare site-specific modeled generation for feasible array orientations. Use the same module capacity, weather period and loss assumptions for every candidate, then apply the actual permitted tilt range.

Feasible candidates satisfy min tilt ≤ tilt ≤ max tilt; rank their entered energy for the same period.

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ Roof B: 4.609754 kWh/m²

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ Mid tilt: 8,500 kWh

FAQ

Compare actual candidate orientations using interval-average direct normal and diffuse horizontal irradiance, solar position and a stated ground reflectance. This isotropic-sky approximation ranks the entered candidates over the supplied intervals. Compare site-specific modeled generation for feasible array orientations. Use the same module capacity, weather period and loss assumptions for every candidate, then apply the actual permitted tilt range.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Solar Tilt Resource and Yield Comparison

Compare actual candidate orientations using interval-average direct normal and diffuse horizontal irradiance, solar position and a stated ground reflectance. This isotropic-sky approximation ranks the entered candidates over the supplied intervals. Compare site-specific modeled generation for feasible array orientations. Use the same module capacity, weather period and loss assumptions for every candidate, then apply the actual permitted tilt range.