What is Shade Analysis?
An assessment of how shadows from trees, chimneys, and nearby buildings affect solar panel performance on your roof.
Quick Answer
In the UK, shade analysis is important because the low winter sun angle means objects cast long shadows. Most MCS-certified installers conduct a shade analysis as part of their site survey. Tools like PV*Sol and SketchUp are commonly used. If significant shading is identified, solutions include microinverters, power optimisers, or repositioning panels to avoid shaded areas.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Shade Analysis Explained
Shade analysis is the process of evaluating how shadows from nearby objects — trees, chimneys, dormers, neighbouring buildings — fall across a roof surface throughout the day and year. It is an essential part of solar system design because even partial shading can significantly reduce panel output. Modern shade analysis uses satellite imagery, 3D modelling, or on-site surveys with specialised tools to quantify the impact and optimise panel placement.
How Does Shade Analysis Work in the UK?
In the UK, shade analysis is important because the low winter sun angle means objects cast long shadows. Most MCS-certified installers conduct a shade analysis as part of their site survey. Tools like PV*Sol and SketchUp are commonly used. If significant shading is identified, solutions include microinverters, power optimisers, or repositioning panels to avoid shaded areas.
Frequently Asked Questions
How much shade is too much for solar panels?
If more than 20% of your roof is shaded during peak hours (10am–3pm), output will be noticeably reduced. Your installer can assess whether microinverters or repositioning can mitigate the impact.
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John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.