Path-Q Solar

How much can a long cable run increase the installation price of a ground-mounted system?

Answer

A long run can increase costs substantially through larger or additional conductors, trenching, conduit, excavation, restoration, voltage-drop management, and labor. There is no reliable universal percentage; the effect must be estimated from the actual distance, power level, route, soil, and installation method.

Key points

  • Distance affects both material quantity and the conductor size needed to limit voltage drop and losses.
  • Buried routes may require trenching, conduit, warning measures, drainage, and surface restoration.
  • AC and DC routing can have different equipment and design implications.
  • A different equipment location or higher-voltage architecture may reduce some costs, subject to compatibility and requirements.

What it depends on

  • Array-to-building distance and route
  • System voltage and current
  • Terrain, soil, and surface restoration
  • Conduit and conductor requirements
  • Labor and equipment access

Risks and trade-offs

  • A cheaper cable design can cause excess losses or fail design limits.
  • A shorter route may require more site disturbance or have other safety constraints.
  • Future repairs are more difficult when conductors are buried over long distances.

Information you may need

  • Measured route length and surface type
  • Proposed system size and voltage
  • Trenching depth and conduit assumptions
  • Restoration and access requirements

Your next step

What to do next

Obtain an itemized proposal showing conductors, conduit, trenching, restoration, voltage-drop assumptions, and the cost of an alternative route.

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