Path-Q Solar

How can I compare expected solar production between two properties I might buy?

Answer

Compare the properties using the same assumptions for usable roof area, orientation, tilt, shading, weather resource, equipment, electricity use, and system constraints. A property with more roof area is not necessarily better if it has greater shade, structural limitations, or less favorable roof geometry.

Key points

  • Obtain a site-specific assessment or comparable production model for each property.
  • Separate physical production from financial value, which depends on each property's consumption and bill structure.
  • Existing solar should be evaluated separately for condition, ownership, age, and remaining obligations.

What it depends on

  • Roof orientation, tilt, area, and shading
  • Structural condition and electrical service
  • Local solar resource and weather assumptions
  • Household load and future energy use
  • Existing system condition or interconnection constraints

Risks and trade-offs

  • Online estimates may miss trees, roof obstructions, or structural issues.
  • A larger modeled system may not produce greater financial value if much output is poorly valued or unused.
  • A property with existing solar may carry transfer, warranty, or repair obligations.

Information you may need

  • Roof plans or clear property imagery
  • Recent electricity bills for each property if available
  • Existing solar contracts, monitoring records, and equipment details
  • Expected occupancy and major future loads

Your next step

What to do next

Request like-for-like assessments for both properties and compare annual production, usable roof area, system condition, and ownership terms separately from purchase price.

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