Electrical design of 2 x 5MW batteries on Tonga

Battery Storage

Detailed electrical design of LV and MV components of BESS systems.

Key Achievements:

  • Stabilising the frequency on Tonga Island grid.


Technical design file of a solar and smart energy system.

Project Scope

  • Review of Electrical Design against Australian Standards.
  • Earthing Design.
  • Cable tray and cable ladder design.
  • Overall electrical schematic.
  • Lock out tag out design.
  • Bill of Materials for earthing, cables, cable trays, cable ladders.

Project Details

  • Tonga 1:  10MWh/5MW BESS project in Tonga.
  • Tonga 2:  17.4MWh/5MW BESS connected to a solar farm in Tonga.
A man working on electrical schematics at an ergonomic desk
A man working on solar panels on a roof

Project Challenges

  • Compliance with Australian Standards in a Pacific Island environment.
  • Long lead time in ordering and delivering components to remote island location.
  • Working across multiple timezones for client and project team.

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