Path-Q Solar
How can I account for seasonal leaf growth when evaluating solar shading?
Answer
Use a shade assessment that measures or models the tree canopy throughout the year, including leaf-on and leaf-off conditions, rather than relying on a single clear-day observation. The production model should reflect the timing and duration of seasonal shade.
Key points
- Leaf density, sun angle, and day length change the shaded area and production impact by month.
- Evergreen and deciduous trees require different seasonal assumptions.
- Photographs, repeated observations, site measurements, or a qualified shade tool can improve the assessment.
What it depends on
- Tree species, canopy density, and seasonal leaf behavior
- Roof orientation, panel location, and local sun path
- Accuracy of the shading tool and production model
Risks and trade-offs
- A leaf-off assessment can overstate annual production for deciduous-tree sites.
- A single leaf-on observation can overstate losses if it represents only part of the year.
- Future growth may make today's estimate less reliable.
Information you may need
- Tree type, height, canopy dimensions, and distance from the roof
- Monthly or time-based shade analysis
- Production estimates with current and expected future canopy conditions
Your next step
What to do next
Ask the installer to document leaf-on and leaf-off assumptions and provide monthly production results with expected tree growth included.
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SQ00655