Path-Q Solar

When is it better to install solar on a new outbuilding instead of the existing home?

Answer

An outbuilding may be better when it has a stronger, newer, less shaded, or more suitable roof and when the electrical route and future use are practical. The home may be better when the outbuilding requires costly trenching, has uncertain plans, or has a less suitable roof.

Key points

  • Compare solar access, roof condition, orientation, structure, usable area, and future shading.
  • Include distance to service equipment, trenching, voltage drop, access, and maintenance.
  • Consider whether the outbuilding has its own loads or whether energy must be transmitted to the home.
  • Check whether placing equipment on the outbuilding affects future expansion or building use.

What it depends on

  • Relative roof and site suitability
  • Electrical service locations and interconnection path
  • Outbuilding construction and future plans
  • Shading, maintenance, and security conditions

Risks and trade-offs

  • A remote array can add trenching, cable, controls, and maintenance complexity.
  • A better solar site may still be uneconomic if the structure needs repairs or reinforcement.
  • The best production site may not align with the most useful load location.

Information you may need

  • Plans and condition of both structures
  • Shading and roof measurements
  • Distance and route between array and electrical service
  • Current and future loads at each building

Your next step

What to do next

Ask for side-by-side proposals using the home and outbuilding sites, with separate line items for structural work, trenching, wiring, and access.

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