Three-phase hybrid inverter options for Perth solar + battery systems

Many Perth homes above 250m² and most duplex/multi-dwelling properties have three-phase power supply. For solar + battery systems on three-phase properties, a three-phase inverter is required. Here's how the main three-phase hybrid options compare.

Do you have three-phase power?

Check your meter box:

• Single-phase: One circuit breaker marked as the main switch; one active, one neutral cable from the street
• Three-phase: Three circuit breakers as the main switch (or one three-pole main switch); three active cables from the street

You can also check your Synergy bill — three-phase services have a different supply charge to single-phase.

Why it matters for solar: A single-phase inverter can only be installed on single-phase supply. Installing a single-phase inverter on a three-phase property creates phase imbalance — the solar only offsets loads on one phase. A three-phase inverter spreads both generation and battery across all three phases.

Three-phase hybrid inverter options in Perth

Sungrow SH 3-phase

Products: SH8KRT, SH10KRT, SH15KRT, SH20KRT, SH25KRT (8–25kW three-phase hybrids)

Battery pairing: Sungrow SBR battery (same ecosystem as single-phase SH) — DC-coupled, locked to Sungrow SBR.

Specifications (SH10KRT):

• Max output: 10kW
• MPPT inputs: 2
• Peak efficiency: ~98.4%
• Battery: Sungrow SBR (multiple units to achieve capacity)

Strengths:

• Deepest Perth installer base of any three-phase hybrid
• Sungrow SBR is typically the most cost-effective solar + storage option
• iSolarCloud monitoring covers three-phase monitoring well
• Wide service network for post-installation support

Limitations:

• Battery locked to Sungrow SBR (no third-party battery option)
• SH range starts at 8kW — overkill for smaller three-phase systems (some Perth installers use Sungrow string inverter + AC-coupled battery on smaller three-phase properties)

Fronius GEN24 three-phase hybrid

Products: Symo GEN24 Plus 6–25kW (three-phase hybrids)

Battery pairing: BYD HVM/HVS (DC-coupled); Fronius Ohmpilot as load controller option.

Specifications (Symo GEN24 Plus 10.0):

• Max output: 10kW
• MPPT inputs: 2
• Peak efficiency: ~98.0%
• Battery: BYD HVM (DC-coupled)

Strengths:

• Fronius Solar.web monitoring regarded as one of the best platforms in Perth
• BYD HVM battery has broader capacity options than SBR
• Three-phase backup power during grid outages (with energy reserve enabled)
• Ohmpilot for hot water diversion on excess solar

Limitations:

• Battery locked to BYD HVM ecosystem
• Typically $1,000–$2,500 more expensive than equivalent Sungrow SH configuration

SolarEdge SE three-phase (with S-Series optimisers)

Products: SolarEdge SE5K–SE27.6K (three-phase); can integrate with SolarEdge Home Battery.

Battery pairing: SolarEdge Home Battery (DC-coupled with SolarEdge hub) — less commonly quoted in Perth than the Sungrow/Fronius options.

Strengths:

• Per-panel optimisers (MLPE) suit shaded or complex three-phase roof installations
• SafeDC for rooftop safety
• Panel-level monitoring across three-phase systems

Limitations:

• SolarEdge Home Battery is not the primary battery option quoted in Perth at three-phase — most Perth SolarEdge quotes are solar-only, with AC-coupled battery added separately
• Higher system cost than Sungrow SH or Fronius Symo

When does three-phase matter most for battery storage?

Battery storage on three-phase properties works best when the battery can balance energy across all three phases — not just one.

Sungrow SH 3-phase + SBR: The three-phase hybrid manages battery charging and discharge across all three phases. This means appliances on any phase benefit from the stored energy, not just the phase connected to a single-phase battery.

AC-coupled battery (e.g., Tesla Powerwall 2) on three-phase: The Powerwall connects on one phase. Loads on the other two phases cannot draw from the Powerwall directly (they draw from the grid). For properties where loads are concentrated on one phase, this is acceptable. For homes with balanced three-phase loads (e.g., ducted AC, workshop, EV on different phases), a three-phase hybrid + battery is more effective.

Typical three-phase system sizing for Perth

| Property type | Typical solar system size | Typical inverter | |---|---|---| | Standard three-phase home (4 bed) | 10–13.2kW | Sungrow SH10KRT or Symo GEN24 Plus 10.0 | | Larger home / high consumption | 15–20kW | Sungrow SH15KRT or Symo GEN24 Plus 15.0 | | Three-phase with EV + pool | 13–20kW | Three-phase hybrid + battery |

Three-phase systems above 10kW require Western Power pre-approval — your installer handles this.

Perth pricing (indicative, 2026)

| System | Approximate installed price | |---|---| | 13.2kW + Sungrow SH10KRT + 9.6kWh SBR | $15,000–$21,000 | | 13.2kW + Fronius Symo GEN24 Plus 10kW + BYD HVM 8.28kWh | $17,000–$23,000 |

Three-phase systems are priced higher than equivalent single-phase systems due to inverter cost and larger typical array size.

Three-phase hybrid inverters in Perth are dominated by Sungrow SH and Fronius Symo GEN24 Plus — the same brands that lead the single-phase hybrid market. Sungrow SH is typically cheaper with a wider installer network; Fronius offers Solar.web monitoring and BYD battery options. For most three-phase Perth homes, Sungrow SH is the default starting point for quotes.