Rob Uyen, based in Australia, recently completed a large-scale three-phase solar and energy storage installation designed to support the high daily energy demand of his residential property. With a household consuming approximately 60 kWh of electricity per day, Rob required a solution that could deliver high power output, strong reliability, and true energy independence. After careful planning and system design, he selected PowMr's 12kW three-phase inverter as the core of his energy system.
System Overview
The system consists of two POW-SunSmart 12KPL3 three-phase inverters connected in parallel, providing a total of 24 kW of three-phase power. This configuration allows the system to handle high instantaneous loads and maintain balanced power delivery across the entire household.
The solar input is 15 kW, divided among four separate solar arrays, which improves system flexibility and ensures optimal energy capture throughout the day. This multi-array design allows the household to harvest solar power efficiently from different orientations and under varying sunlight conditions, enhancing overall system performance.
Energy storage is provided by 52 kWh of batteries, equivalent to approximately 1120 Ah at 48 VDC. The combination of high-capacity batteries with parallel inverters ensures the system can deliver reliable power during peak consumption periods and periods without solar production. The design emphasizes efficiency, operational reliability, and future expandability, meeting the needs of a large, high-consumption household.
AC Distribution
The AC distribution strategy of Rob's system is designed as a Sub-Distribution network, a common approach in large residential and commercial installations. In this design, power from the inverters is first delivered to multiple local distribution boards, which serve high-demand circuits in close proximity. From these local boards, electricity is routed to the main distribution board, which then supplies power to additional circuits and remote areas of the house.
Rob's residence consumes approximately 60 kWh of electricity per day, a substantial load for a single home. The Sub-Distribution layout ensures that high-demand circuits receive power efficiently and reliably, while the main distribution board is protected from carrying the full instantaneous load, supporting stable operation under heavy daily energy use.
Battery Storage
Rob's 52 kWh battery bank provides energy during periods without solar production and supports peak household loads. Batteries are connected through a central busbar with a mirrored wiring scheme for the parallel inverters, ensuring balanced current flow and preventing electrical imbalance.
To protect the batteries and inverters from heat, temperature-controlled ventilation fans were installed, as the system is located under a hot roof.
This battery setup allows the system to function as a true UPS, providing uninterrupted power during outages while maintaining high efficiency and long-term reliability.
Advanced Protection and Safety
Rob’s system includes four DALI 200A VMS units. All the switchbanks are electrically fused and fully isolated, which means each section can be safely serviced without affecting the rest of the system. This isolation makes maintenance easier and safer.
All major components are connected through a central busbar, creating a clean and organized DC architecture that supports high-current operation. The parallel inverters are wired using a mirrored connection method to maintain balanced electrical paths:
- The first inverter has its positive terminal connected to the top rail of the busbar and its negative terminal connected to the bottom rail.
- The second inverter is wired in a mirrored configuration, with positives and negatives connected to the opposite rails.
All the batteries share the busbar, which ensures balanced current distribution between the inverters and prevents electrical imbalance.
Conclusion
Rob's three-phase solar and storage system demonstrates how careful design, parallel inverters, and robust AC distribution can support very high residential energy demand. The result is a reliable, expandable solution that delivers daily energy independence, balanced power delivery, and uninterrupted operation even under heavy loads.
