Water Authority

Water Authority 770kW Ground Mount

Solar design and grid approval

Detailed design and grid connection management for 770kW solar PV system across three Water Treatment Plants.

Key Achievements:

  • Grid connection approval management and detailed design.
  • Commissioning and Quality management.
  • Post installation testing.


Technical design file of a solar and smart energy system.

Project Scope

  • Detail design for construction – including SLDs, site layouts, schematics, conduit sections, cable list, stringing diagrams, fault study.
  • Testing – injection testing, export limit testing, interlock testing.
  • Grid application and management – United Energy and Ausnet.
  • Commissioning and Quality Management.

Project Details

  • 3 x LV PV switchboards for 15 inverters.
  • Ground-mount system requiring careful cable calculations to use aluminium cables.
  • ABB inverter systems.
  • ComAP protection relays, with interlocks at each LV connection and communications.
A man working on electrical schematics at an ergonomic desk
A man working on solar panels on a roof

Project Challenges

  • Interlocks between solar contactors/Motorised ACB and protection relays at each site.
  • Strict timelines for delivery met by the Enhar engineering team.
  • Complex and detailed drawing protocols from client.

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