Home Solar Shading Loss Calculator
Shade on even part of a solar array can meaningfully cut your energy output. Enter your system details and typical shading exposure to estimate the annual production loss.
About this calculator
Estimate how much shading from trees, roofs, or nearby structures reduces your solar panel array's annual energy output.
Frequently Asked Questions
How much does shading really reduce solar output?
Because panels are often wired in series, even shading on a small portion of an array can disproportionately reduce total output — this calculator applies a severity multiplier to approximate that effect.
Can microinverters or power optimizers reduce shading losses?
Yes. Module-level power electronics like microinverters or optimizers let each panel operate independently, significantly reducing the impact of partial shading compared to a traditional string inverter.
Should I trim trees to reduce shading loss?
If feasible and legal, reducing shade sources can meaningfully improve production. This calculator can help you estimate the dollar value of what shading is costing you annually to decide if action is worthwhile.