Path-Q Solar

How do trenching and long cable runs affect the cost of a ground-mounted system compared with rooftop solar?

Answer

A distant ground array can require trench excavation, conduit, larger or additional conductors, restoration, and voltage-drop management, which may make it more expensive than a rooftop array despite easier panel access. The impact depends primarily on distance, terrain, conductor sizing, route difficulty, and the system's DC or AC architecture.

Key points

  • Longer runs increase material, labor, and voltage-drop considerations.
  • Rock, paved surfaces, drainage, landscaping, and utility conflicts can raise trenching cost.
  • Higher-voltage or different equipment placement may reduce conductor size or losses, but changes the design.
  • The route should be considered for future repair and water management, not only installation.

What it depends on

  • Array-to-service distance
  • Terrain and surface restoration requirements
  • Conduit and conductor design
  • System voltage and inverter location
  • Utility, drainage, and underground-obstruction constraints

Risks and trade-offs

  • Choosing a shorter route without checking underground hazards can create safety and property risks.
  • Undersized conductors can increase losses or violate design limits.
  • A more expensive trench may still be worthwhile if the ground array has better orientation or service access.

Information you may need

  • Scaled site plan and preferred cable route
  • Ground and surface conditions
  • Electrical design and conductor sizing
  • Restoration and access requirements

Your next step

What to do next

Obtain a site-specific ground-mount quote with trench length, surface restoration, conduit, conductors, and voltage-drop assumptions itemized.

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SQ01896