Path-Q Solar

Is solar still suitable when nearby buildings shade my roof throughout part of the year?

Answer

It may still be suitable, but substantial recurring shade can reduce production enough to affect system size, payback, and design. The decision should be based on an annual shading assessment rather than a single observation on a sunny day.

Key points

  • Shading losses depend on the obstruction's height, distance, direction, and seasonal sun path.
  • A smaller unshaded installation may be better than covering heavily shaded areas.
  • Alternative sites such as a ground mount or canopy may perform better if available.

What it depends on

  • Annual duration and intensity of shading
  • Roof-plane orientation and tilt
  • Target energy production and financial objective
  • Availability and suitability of alternative sites

Risks and trade-offs

  • Expected production may be materially lower than an unshaded estimate.
  • Shade-mitigation equipment can add complexity without eliminating the underlying loss.
  • Trees or buildings may change future shading conditions.

Information you may need

  • Shading analysis for the proposed panel areas
  • Roof measurements and orientations
  • Electricity-use target
  • Potential alternative mounting locations

Your next step

What to do next

Obtain a site-specific annual shade study and compare the resulting design with any feasible unshaded alternative.

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