Path-Q Solar
What quote differences indicate that installers are using different panel layout assumptions?
Answer
Differences in panel count, system capacity, roof-plane allocation, setbacks, access paths, and obstruction treatment usually indicate different layout assumptions. Compare scaled drawings and not just total kilowatts or price.
Key points
- Check the number and dimensions of panels on each roof plane.
- Look for different treatment of vents, skylights, chimneys, dormers, valleys, and fire or maintenance access.
- Compare orientation, tilt, row spacing, and whether shaded areas are included.
- Review whether one quote uses higher-wattage panels or a different equipment configuration to explain capacity differences.
- Confirm that structural and electrical constraints are reflected in the layout.
What it depends on
- Accurate roof measurements
- Panel dimensions and wattage
- Required setbacks and access
- Obstructions and shading
- Structural and electrical design limits
Risks and trade-offs
- A larger array may be based on unusable or difficult-to-maintain roof area.
- A smaller array may be more realistic but could have different economics.
- Different layouts can change shading, wiring, equipment cost, and production.
Information you may need
- Scaled roof-layout drawings from each installer
- Panel model, dimensions, and count
- Roof measurements and obstruction map
- Setback and access assumptions
- Production estimate by roof plane
Your next step
What to do next
Overlay the proposed layouts on one verified roof plan and ask each installer to explain every difference in included area and panel count.
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