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Three-phase homes need more than storage capacity—they need balanced backup power when the grid drops. As of mid-2025, the leading three-phase solar battery options are Sigenergy’s fully-integrated SigenStor, Sungrow’s value-packed SH-RT hybrid inverter plus SBR/SBH batteries, and the premium pairing of a Fronius GEN24Plus inverter with modular BYD Battery-Box units. Each delivers genuine three-phase backup, modular expansion, and uses CEC-approved hardware that SAA-accredited installers can fit.
If you only need essential single-phase loads covered, a TeslaPowerwall3 remains a strong, high-capacity choice—just note it will not energise three-phase appliances without complex workarounds. Decide first whether whole-home three-phase resilience is critical, then match an approved system to your budget, solar size, and the incoming Cheaper Home Batteries Program rebate.
What are my Battery options in Australia if I have Three-Phase Power?
Batteries let Australians use rooftop solar after sunset, cut peak tariffs, and ride through blackouts. For homes on three-phase supply—common where there’s ducted air-conditioning, EV chargers, or workshop machinery—the battery decision is different. A compliant system must juggle three live
conductors while meeting AS/NZS5139 (battery safety) and AS/NZS5033 (PV arrays). Smart timing also matters: from 1 July 2025 the federal Cheaper Home Batteries Program will discount eligible systems by around 30% on the usable-capacity portion, and Western Australians can access a combined federal-state rebate worth up to $5,000 for Synergy customers or $7,500 for HorizonPower customers (the WA component is capped at $1,300 and $3,800 respectively). Planning ahead now secures the best outcome when these incentives land.
Why does battery selection change in a three-phase home
Three-phase supply splits incoming power into three 230V lines, providing smoother delivery and higher peak capacity than single-phase. A standard battery with a single-phase inverter can still charge from solar and discharge across all phases while the grid is healthy. During an outage, however, it will energise only the wired phase, leaving three-phase loads dead. If your household relies on a ducted heat-pump, bore pump, or commercial-grade tools, that is unacceptable.
A true three-phase battery backup keeps all phases energised simultaneously and seamlessly isolates the house from the grid. Achieving that requires:
- A native three-phase hybrid inverter that can synchronise and balance output across phases.
- Modular, high-voltage lithium-iron-phosphate (LFP) storage sized for both continuous and surge power on each phase.
- SAA-accredited installation using CEC-approved products for warranty and rebate eligibility.
What makes a battery truly three-phase ready?
- Hybrid inverter topology: Look for “3Φ backup” or “three-phase off-grid mode”.
- Efficient power electronics: Modern hybrids deliver 98.0–98.6% peak efficiency, minimising round-trip losses.
- Depth of discharge & modularity: 90–100% DoD and stackable 5–8 kWh blocks let you scale from 10 kWh now to 40 kWh later.
- Warranty strength: Ten-year cover plus a minimum 60% end-of-warranty capacity is the current benchmark.
- Smart energy management: AI forecasting optimises self-consumption, tariff arbitrage, and (soon) vehicle-to-home, without extra third-party hardware.
Leading three-phase battery solutions for Australian homes in 2025
Sigenergy SigenStor—integrated intelligence for demanding homes
The sleek SigenStor cabinet combines stackable 5kWh or 8kWh LFP modules with a purpose-built three-phase energy controller in 10, 15, or 20kW sizes. One tower scales to 48 kWh; multiple towers can be paralleled for rural properties with heavy loads. AI-driven software learns household patterns and automatically optimises solar, battery, and tariff timing. The optional DC EV charger is already V2X-ready pending Australian standards, future-proofing your investment.
Sungrow SH-RT + SBR/SBH—value without compromise
Sungrow dominates hybrid inverter sales thanks to robust design and aggressive pricing. The SH-RT three-phase range (5–25kW) couples neatly with SBR/SBH high-voltage stacks that start at 9.6kWh and scale past 25kWh per tower. Peak inverter efficiency sits between 98.0% and 98.6%, depending on model, with rapid UPS-grade switchover and weather-sealed enclosures. A ten-year warranty applies to both the inverter and the battery, with throughput limits clearly spelled out in Australian warranty documents.
Fronius GEN24 Plus + BYD Battery-Box—premium performance and insight
For homeowners who value Austrian engineering and granular monitoring, the GEN24Plus (up to 10kW three-phase) paired with BYD HVS/HVM modules is hard to top. Fronius’ MultiFlow Technology channels solar, battery, and grid simultaneously, giving high-surge appliances like induction cooktops full power during an outage. The Solar.web portal offers real-time per-phase graphs and firmware updates that keep pace with evolving standards. Higher upfront cost is offset by renowned build quality and long-term reliability.
Where does Tesla Powerwall 3 fit?
The Powerwall3 (13.5 kWh usable) is still one of the most requested batteries, thanks to its integrated inverter and polished app. In a three-phase home, it monitors consumption on all phases, but in a blackout, it energises only the wired phase. Multiple Powerwalls can cover separate phases, yet true phase-synchronised backup remains complex and costly. If your goal is to keep fridges, lights, and the NBN modem alive rather than run a three-phase heat-pump, a single Powerwall may suffice; otherwise, choose a dedicated three-phase system.
Five steps to the right system
- Audit your loads: Check smart-meter data for peak demand per phase and list appliances you must run in an outage.
- Confirm inverter strategy: Decide between replacing an existing solar inverter with a hybrid model or opting for AC-coupled storage.
- Leverage incentives: The Small-scale Renewable Energy Scheme still lowers PV costs via STCs, and from July 2025, the federal battery discount (~30%) will piggy-back on that mechanism. In WA, the combined rebate is worth up to $5,000 (Synergy) or $7,500 (HorizonPower).
- Source multiple quotes: Engage at least three SAA-accredited installers experienced in three-phase work; insist on a wiring diagram and clear backup limits.
- Plan for the long haul: Allocate wall or floor space with room to expand and ensure warranties are registered in your name.
Conclusion—night-time resilience made easy
Choosing the best battery for night use in a three-phase Australian home hinges on your backup ambition. For seamless, whole-home power, integrated solutions such as Sigenergy SigenStor, Sungrow SH-RT with SBR/SBH, and Fronius GEN24Plus with BYD deliver balanced output, advanced energy management, and modular growth. If essentials-only backup is acceptable, a Tesla Powerwall 3 offers ample capacity in a simpler package—just accept its single-phase limitation.
By defining your critical loads, timing your purchase around the solar battery rebate Australia schemes, and working with experienced professionals, you will lock in lower night-time bills, insulation from outages, and long-term energy independence.
Need tailored guidance? Your Energy Answers can connect you—free—to trusted, three-phase specialists near you.
