Path-Q Solar

How much can trenching add to the cost of a ground-mounted solar system?

Answer

Trenching can add a substantial site-specific cost, but no dependable generic amount applies. The main drivers are trench length, soil and rock, depth and width, surface restoration, conduit and conductors, drainage, access, and whether electrical or utility requirements change.

Key points

  • Longer distances increase excavation, conduit, wire, voltage-drop, and restoration requirements.
  • Rock, steep terrain, groundwater, existing utilities, pavement, and landscaping can greatly change the scope.
  • The system design may use different conductor or voltage choices to manage distance, subject to equipment limits.
  • Trenching should be priced as a separate line item with assumptions clearly stated.

What it depends on

  • Route length and surface types
  • Soil, rock, drainage, and existing underground utilities
  • System voltage, conductor size, and required burial or protection
  • Access for excavation and restoration requirements

Risks and trade-offs

  • Unforeseen subsurface conditions can create change orders.
  • A cheaper route may increase voltage drop, maintenance difficulty, or future access problems.
  • Restoration of paving, landscaping, or drainage can be a major part of the total cost.

Information you may need

  • Scaled site plan and proposed trench route
  • Utility locate and site-condition information
  • Itemized excavation, conduit, conductor, and restoration quote

Your next step

What to do next

Ask for a site-specific trenching allowance or fixed-scope quote that states route, depth, surfaces, subsurface assumptions, and restoration responsibilities.

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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