Path-Q Solar

Would a west-facing roof be preferable when my electricity use is highest in the afternoon?

Answer

It may be preferable when the west-facing roof produces closer to the property's highest-use period, especially if using solar directly is more valuable than exporting it. It is not automatically best: compare west-facing and alternative layouts using hourly load, shading, roof pitch, annual production, storage, and the applicable treatment of exports.

Key points

  • West-facing modules generally shift more production later than east- or some south-facing layouts.
  • The benefit depends on whether afternoon demand is coincident with solar production.
  • A west-facing roof may experience different shading and temperature conditions than other roof planes.
  • Evaluate self-consumption, export, peak demand, and storage effects rather than annual kilowatt-hours alone.

What it depends on

  • Hourly electricity-use profile
  • Roof orientation, pitch, shading, and usable area
  • System size and storage
  • Export valuation and billing structure

Risks and trade-offs

  • A west-facing design may produce less annual energy than another available orientation.
  • Afternoon production can still be exported if loads are lower than expected.
  • The result can change with future changes in occupancy, appliances, business hours, or storage.

Information you may need

  • Interval electricity consumption
  • Roof orientation, pitch, shading, and available area
  • Modeled hourly output for competing layouts
  • Storage and export assumptions

Your next step

What to do next

Ask for a comparative design showing hourly production, self-consumption, exports, and annual results for west-facing and alternative roof planes.

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SQ02150