Cardinia Childcare

Cardinia Childcare: Solar PV and BESS

Solar Hybrid Detail Design

Detailed design and Grid connection management for 2 x 100kW rooftop solar and 180kW/hr/90kW flow batteries.

Key Achievements:

  • Runner up in the 2019 NECA excellence awards under the Energy Efficiency and Environment.
  • Grid application management and approvals.


Technical design file of a solar and smart energy system.

Project Scope

  • Detail design for construction – SLDs, Schematics, switchboard GA's.
  • Board builder liaison and management.
  • Site testing including, relay setting, injection testing and power quality logging.
  • Grid Applications – United Energy and Ausnet.

Project Details

  • 2 x 100kW roof top solar PV systems, 2 x 180kWh/90kW Redflow batteries.
  • Victron inverter/chargers and control.
  • Changeover switch to bypass batteries.
  • Volt Amp / Volt Watt response modes.
  • Export limited.
  • Grid protection relay on solar inverters and inverter chargers.
  • Minimal volt drop through the 2250A DC switchboard.

A man working on electrical schematics at an ergonomic desk
A man working on solar panels on a roof

Project Challenges

  • Flow batteries require significant space with limited room on site; however they have a long lifetime.
  • Flow batteries are required to be fully discharged every two days.
  • Victron inverter/chargers are single phase, therefore a phase imbalance relay was required.
  • Multiple solar PV orientations.

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