Path-Q Solar

What should I verify before deciding that a solar system is unsuitable because the roof is shaded?

Answer

Verify the shading over the year, not just at one time of day or season, and ask whether a different roof plane, structure, layout, or system design changes the result. A measured or modeled production comparison is more reliable than a visual conclusion that the roof is simply too shaded.

Key points

  • Identify the sources, timing, and likely future changes of shade.
  • Request production estimates for affected and less-shaded roof areas.
  • Ask whether module-level design changes, trimming, or an alternate mounting location are practical and permitted.
  • Include the cost, maintenance, and risks of any shading remedy in the comparison.

What it depends on

  • Seasonal and hourly shading patterns
  • Roof orientation, available area, and alternate mounting sites
  • Tree ownership and likely future growth
  • System design and the quality of the shading model

Risks and trade-offs

  • Removing or trimming trees may create cost, maintenance, environmental, or neighbor issues.
  • A shading-mitigation design may cost more and still produce less energy.
  • A single visual inspection can overstate or understate annual production impact.

Information you may need

  • Site survey and shading analysis
  • Roof and alternate-site measurements
  • Tree or obstruction information
  • Production and cost estimates for practical alternatives

Your next step

What to do next

Ask an installer or independent assessor for a documented annual shading and production comparison before concluding that solar is unsuitable.

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