Path-Q Solar

How can I test whether an installer’s production estimate is realistic?

Answer

Check the model's location, weather data, roof geometry, shading, orientation, losses, degradation, equipment ratings, and assumptions against an independent production estimate.

Key points

  • Ask for monthly output, not only annual output.
  • Check whether estimates are gross or net of losses.
  • Compare several providers using the same inputs.

What it depends on

  • Site survey
  • Modeling method and data
  • Equipment and loss assumptions

Risks and trade-offs

  • No forecast guarantees actual production.
  • Optimistic shading or loss assumptions can inflate savings.

Information you may need

  • Production report
  • Layout and shade analysis
  • Loss and degradation assumptions

Your next step

What to do next

Obtain an independent model or compare multiple detailed models and investigate material differences.

Path-Q

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SQ00091