Solar Shading Loss Estimator
This scenario estimates the effect of an assumed annual shading-loss percentage on a solar yield estimate. It is intended for comparing scenarios before a site-specific shade study.
How to use this calculator
- Base the input yield on a credible site model and use a shading estimate from the same system conditions.
- Check that the input values use the same units and reporting period before comparing scenarios.
- Change one assumption at a time to see which input drives the result.
Formula and method
Estimated lost energy = unshaded yield × shading loss; adjusted yield = unshaded yield − lost energy.
- Lost energy = 1,170 kWh/year; adjusted yield = 5,330 kWh/year.
- Real shading effects change by season, string layout, bypass diodes, orientation and time of day. The entered percent is an assumption, not a prediction from site geometry.
Worked examples
Worked example
An unshaded estimate of 6,500 kWh/year with an 18% assumed shading loss.
Lost energy = 1,170 kWh/year; adjusted yield = 5,330 kWh/year.
The adjusted annual energy estimate is 5,330 kWh.
Understanding the result
The adjusted annual energy estimate is 5,330 kWh.
Real shading effects change by season, string layout, bypass diodes, orientation and time of day. The entered percent is an assumption, not a prediction from site geometry.
Important notes
Base the input yield on a credible site model and use a shading estimate from the same system conditions.
The displayed result uses the entered assumptions; validate important estimates against source measurements, specifications or qualified guidance.
Frequently asked questions
Does this simulate tree or chimney shade?
No. It applies one user-supplied percentage and does not calculate shade geometry.
Is the energy value guaranteed savings?
No. It multiplies lost energy by your entered value rate; export rules, timing and tariffs can change the value.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.