Path-Q Solar

What project costs are likely when a solar installation requires a long cable route through the building?

Answer

A long interior cable route can add costs for longer conductors, conduit, penetrations, firestopping, access work, protection, and labor; the amount cannot be estimated reliably without a route-specific design and quote.

Key points

  • The route's length, conductor size, voltage, and whether it is AC or DC affect material and labor requirements.
  • Finished walls, ceilings, fire-rated assemblies, hazardous areas, and difficult access can increase work.
  • Electrical losses and voltage drop may require larger conductors or a different equipment location.

What it depends on

  • Measured route length and accessibility
  • Conductor requirements and voltage-drop limits
  • Building construction and finish restoration
  • Equipment locations and required penetrations

Risks and trade-offs

  • The least expensive route may be more visible or disruptive.
  • Poorly documented penetrations can create moisture, fire, or maintenance risks.
  • A longer route may reduce efficiency or require larger conductors.

Information you may need

  • Marked-up site and floor plans
  • Proposed cable type, length, and routing method
  • Details of wall, ceiling, roof, and fire-rated penetrations

Your next step

What to do next

Obtain an itemized quote with the cable route, penetrations, restoration, conductor sizing, and any alternatives shown separately.

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