Path-Q Solar

What information should I collect to estimate the value of solar before contacting an installer?

Answer

Collect recent electricity usage, basic roof and shading information, property and ownership details, and your financial and project goals. This supports a preliminary estimate, but an installer still needs to verify roof condition, layout, structural suitability, electrical service, and interconnection assumptions.

Key points

  • Gather bills or usage data covering seasonal variation, preferably in energy units as well as cost.
  • Record roof planes, approximate dimensions, orientation, pitch, obstructions, and shading.
  • Note roof age, material, repair history, and any planned renovations.
  • Define whether you want maximum production, bill reduction, backup power, or a particular budget.

What it depends on

  • Quality and duration of usage data
  • Roof geometry, condition, and shading
  • Existing electrical service and loads
  • Ownership period and payment preference
  • Whether batteries or an outbuilding are being considered

Risks and trade-offs

  • A preliminary estimate can be materially wrong if roof or usage assumptions are inaccurate.
  • Future changes in occupancy, energy use, or roof condition can change the value.
  • A larger system is not automatically better if it adds cost without useful additional production or consumption offset.

Information you may need

  • Recent utility bills or interval usage
  • Roof photos, dimensions, and age
  • Shading and obstruction information
  • Service-panel and major-load information if available
  • Budget, ownership horizon, and battery preferences

Your next step

What to do next

Assemble the information into a one-page project brief and give the same brief to multiple installers for comparable preliminary estimates.

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