Path-Q Solar
How can I estimate future tree shading before installing solar?
Answer
Estimate future shading by combining a year-round shade assessment with the tree's current height, species, health, growth rate, mature size, and likely pruning or removal plans. The design should test future shade, not just the tree's appearance on the installation date.
Key points
- Measure the tree's location, height, canopy spread, and distance from the roof.
- Use species-specific mature-size and growth information where available.
- Model shade across seasons and over the expected solar-system life.
- Include nearby trees and structures that may also change.
What it depends on
- Tree species, age, health, and growth rate
- Canopy direction and local sun path
- Distance and elevation relative to the roof
- Planned maintenance or property changes
- Quality and time horizon of the shade model
Risks and trade-offs
- Growth estimates are uncertain, especially for damaged or unusually maintained trees.
- A current shade snapshot can materially understate future losses.
- Overly conservative assumptions may exclude usable roof area or increase design cost.
Information you may need
- Tree measurements and species identification
- A year-round shade report
- Expected system life and production assumptions
- An arborist opinion if tree health or mature size is uncertain
Your next step
What to do next
Ask the solar designer to provide present-day and future-growth production scenarios for each roof section.
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