Path-Q Solar
What size solar system can fit on the suitable parts of my roof without placing panels in heavily shaded or poorly oriented areas?
Answer
The practical system size is the number of panels that fit on usable roof sections after excluding setbacks, obstructions, unsafe areas, heavy shade, and orientations with unacceptable production. It cannot be determined reliably from roof area alone; it requires a roof layout, panel dimensions, shading analysis, and electrical design.
Key points
- Usable area is reduced by roof edges, ridges, valleys, vents, skylights, chimneys, access paths, and required clearances.
- Different roof planes may produce different amounts of energy even when they fit the same number of panels.
- Shade should be evaluated across relevant times and seasons rather than from a single visual inspection.
- The maximum physical panel count may not be the best economic system size.
What it depends on
- Roof dimensions, geometry, and structural condition
- Obstructions and required access or safety clearances
- Shading by trees, buildings, and roof features
- Panel dimensions, electrical layout, and target energy use
Risks and trade-offs
- Including marginally shaded or poorly oriented areas may increase panel count while adding less useful production.
- Excluding too much area may leave potential production unused if the design could manage mismatch effectively.
- Structural, fire-safety, and permitting requirements must be confirmed for the actual property.
Information you may need
- Roof plan or measured dimensions
- Recent aerial or roof imagery and obstruction locations
- Shade observations or a professional shade analysis
- Annual electricity use and candidate panel specifications
Your next step
What to do next
Ask for a site-specific layout showing panel count, excluded areas, shading assumptions, expected production, and the reason each roof section is included or excluded.
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SQ01150