Path-Q Solar
How can seasonal tree shadows affect whether a roof is suitable for solar?
Answer
Trees can reduce production during different parts of the year as the sun's path and foliage change. A roof that appears suitable in one season may have significant morning, afternoon, winter, or summer shading, so suitability should be based on a year-round shading assessment rather than a single visual inspection.
Key points
- Assess deciduous trees both with and without leaves.
- Consider changing sun angles, tree height, and shadow movement throughout the day.
- Partial shading can affect individual panel groups and the system's output.
- A less shaded roof plane may outperform a larger but heavily shaded one.
What it depends on
- Tree species, height, canopy, and distance from the roof
- Seasonal sun path and local weather
- Panel layout and electrical design
- Whether trees may be pruned, removed, or allowed to grow
Risks and trade-offs
- Ignoring seasonal shade can materially overstate production and savings.
- Removing or heavily pruning trees can have cost, environmental, privacy, and property implications.
- Shade-mitigation equipment may reduce losses but does not eliminate blocked sunlight.
Information you may need
- Year-round shade measurements or a detailed site model
- Tree locations, species, and expected growth
- Production estimates with and without shading
- Any planned tree work
Your next step
What to do next
Request a year-round shade analysis that identifies affected roof areas and shows the modeled production impact before deciding on array placement.
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