Farms & Commercial Stand-Alone Power Systems (3-Phase Sites)

Lake Mountain Alpine Resort - 86kW 3-Phase stand-alone power system with generator integration

Large-scale commercial or agricultural operations with three-phase loads have unique power requirements. These sites often operate high-demand equipment such as pumps, irrigation systems, refrigeration, cold storage, dairy milking plants, workshops, and commercial kitchens — all of which place substantial and often unbalanced loads on the power system. In many rural locations, a reliable grid connection is unavailable or insufficient to meet peak energy demands. In these cases, a well-designed 3-phase stand-alone or hybrid solar power system is the most cost-effective and reliable long-term solution.

Applications and Common Use Cases

Agricultural sites with 3-phase pumps or machinery
Remote farms and off-grid homesteads with large autonomous energy requirements
Wineries, dairies, or food processing operations with cold storage or heat pumps
Industrial workshops or facilities with a limited or unreliable grid supply
Community centres, campgrounds, and alpine resorts with distributed loads.

Why Off-Grid or Hybrid 3-Phase Systems?

Conventional power upgrades, such as new grid connections or transformer upgrades, can be extremely expensive in remote areas, often exceeding $100,000. Hybrid solar and battery systems can provide a more practical, cost-effective and scalable alternative.

Benefits of commercial stand-alone and hybrid systems include:

Elimination of peak demand charges and capacity upgrades
Greater power reliability, and security
Lower operating costs through generator runtime reduction
Modular system design with expandable battery and solar capacity
Improved power quality and phase balancing

Kinglake Whiskey Distillary 3-Phase stand-alone power system

Typical Load and System Sizing

Commercial 3-phase systems can range from 20 kWh to over 200 kWh daily usage and require inverters and batteries sized for both peak power (20–60 kW) and load diversity.

A basic dairy farm might run multiple pumps, a 3-phase vacuum system, hot water units, and cold storage — resulting in:

Peak power demand of 15–40 kW continuous
Daily energy use of 60–200 kWh
Required battery storage of 100–500 kWh usable
Solar array sizing of 30–100+ kW

⚡ Inverter Options and System Flexibility

Our 3-phase systems are designed using:

Selectronic SP PRO inverter clusters (60kW per phase) up to 240kW.
Victron inverter stacks (modular multi-unit 3-phase support) up to 180kW
Optional AC or DC-coupled solar arrays
Synchronised control of auto-start diesel backup generators
Remote system control via online monitoring (e.g. Select.live, Victron VRM)

All systems are fully commissioned and tested onsite, and can be delivered along with custom switchboards or container-based hubs for easy installation.

Case Studies from the Field

✅ Alpine Resort UPS Power System – 3-phase 200kWh lithium battery bank to provide uninterrupted power and reduce generator runtime in a remote alpine facility.
✅ Dairy Farm Hybrid System – 75kW solar with integrated 3-phase inverter and 96kWh battery bank designed to offset peak electricity tariffs and provide full 24/7 autonomy.
✅ Resort Camp Facility – 3-phase solar and battery-assisted system to support high-demand loads at the end of a restricted SWER line (single-wire earth return).

Lyrebird Camp 3-phase hybrid system to support high-demand loads at the end of a restricted SWER line

Hybrid System Benefits (as covered in our related article)

Commercial sites that already use diesel generation can benefit significantly from solar and battery integration:

Reduce generator runtime by 50–80%
Extend generator lifespan and reduce servicing costs
Ensure quiet, clean energy for daytime and overnight loads
Automatically manage transitions between the generator and battery/solar supply

✅ Why Choose Transfer Solar?

At Transfer Solar, we specialise in designing and building custom-engineered three-phase off-grid and hybrid power systems tailored to the needs of farms and commercial sites across Victoria. Our systems offer exceptional reliability, expandability, and intelligent load control, helping businesses reduce diesel generator use, lower energy costs, and enhance power quality.

Whether you're running a farm, food business, accommodation lodge, or industrial operation, Transfer Solar can design a robust and scalable 3-phase off-grid or hybrid power system to meet your needs. Our systems are engineered with safety, compliance, and future growth in mind, and are delivered with ongoing technical support.

👉 Contact Transfer Solar today to discuss your specific site requirements and discover how a professionally designed 3-phase off-grid or hybrid system can help you save money and increase energy independence and security.

Commercial Solutions