Path-Q Solar
Should I install solar if my roof will be shaded by planned construction?
Answer
Usually, the construction should be incorporated into the design before deciding. If the planned structure will substantially shade the array, waiting, changing the array location or design, or comparing the project with and without the future shading may be better than installing a system based on today's sun conditions.
Key points
- Use the future building height, location, orientation, and construction timing in the shade analysis.
- Partial shading can reduce output unevenly and may affect strings or module-level electronics differently.
- Construction may also affect roof access, permits, structural loading, and future removal or relocation costs.
What it depends on
- Final construction plans and schedule
- Roof and property layout
- Seasonal shade pattern and desired system output
- Expected cost and feasibility of relocating or redesigning the array
Risks and trade-offs
- Installing before construction can lock in a design that later underperforms.
- Waiting may delay savings or expose the project to changing equipment and financing conditions.
- Relocating an installed system can be costly and may affect warranties or roof work.
Information you may need
- Scaled plans and final height of the proposed construction
- Solar access analysis for current and future conditions
- Construction timing and any planned roof changes
Your next step
What to do next
Obtain a shade study using the completed construction plans and ask bidders to compare install-now, redesign, and wait scenarios on the same assumptions.
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