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

If your Perth home is on three-phase power and you want solar with a battery, you need a three-phase hybrid inverter. Three brands cover almost every three-phase quote you'll see in Perth: Sungrow (the SH RT range), Fronius (Symo GEN24 Plus), and SolarEdge (three-phase). Sungrow is usually the cheapest and the most widely installed. Fronius wins on Solar.web monitoring and pairs with BYD batteries. SolarEdge suits shaded or complex roofs because it optimises each panel. The rest of this guide shows you how to tell if you're on three-phase, what each option does, and when the three-phase decision actually changes your bill.

Quick version if you just want the shortlist:

• Want the cheapest, best-supported setup? Sungrow SH RT with a Sungrow SBR battery.
• Want the best monitoring and flexible battery sizing? Fronius Symo GEN24 Plus with a BYD Battery-Box.
• Got a shaded, split, or awkward roof? SolarEdge three-phase with per-panel optimisers.

One thing worth clearing up first. A hybrid inverter is just an inverter with a battery connection built in, so you don't need a separate battery inverter. Three-phase means it splits both your solar generation and your battery output across all three of your home's phases instead of just one.

How do I know if I have three-phase power?

Have a look in your meter box. There are two things that give it away:

• Single-phase: one main-switch circuit breaker, and one active plus one neutral cable coming in from the street.
• Three-phase: three main-switch breakers (or a single three-pole main switch), and three active cables from the street.

If the meter box doesn't settle it, ask Synergy or Western Power directly. Your bill's daily supply charge doesn't reliably show which one you're on, so it's not a check to rely on.

Larger and newer builds are the usual candidates. Many Perth homes above roughly 250 square metres, and most duplexes and multi-dwelling properties, come with three-phase supply because it handles bigger loads more evenly.

Why does three-phase change your inverter choice?

A single-phase inverter can only go on a single-phase supply. Put one on a three-phase home and your solar only offsets the loads sitting on that one phase. The other two phases keep pulling from the grid at full price, even when your panels are flooding the first phase with free power.

Phase imbalance is the term for that gap: solar piling up on one phase while the other two buy from the grid. It quietly wastes power you've already generated, and Western Power caps how far your phases are allowed to drift apart (more on that below).

A three-phase inverter spreads generation, and battery charge and discharge, across all three phases. Every phase gets to use the solar and the stored energy, not just the one the inverter happens to sit on.

What are the main three-phase hybrid inverter options in Perth?

Sungrow SH RT range

The Sungrow three-phase hybrid range is the SH RT series: SH8.0RT, SH10RT, SH15RT, SH20RT and SH25RT, covering roughly 8 to 25kW. It pairs with the Sungrow SBR battery, DC-coupled, in the same ecosystem as the single-phase SH inverters. The battery is locked to the SBR, so there's no third-party battery option here.

The SH10RT is the common pick for a standard four-bedroom Perth home:

• Max output: 10kW
• MPPT inputs: 2
• Peak efficiency: 98.4%
• Battery: Sungrow SBR, stacked in modules to reach the capacity you want

What people like about it:

• One of the most widely quoted and installed three-phase hybrids in Perth, so finding an installer and later service is straightforward.
• The Sungrow SH plus SBR pairing is often one of the more affordable solar-and-storage combinations, though the actual price depends on your system size and installer.
• iSolarCloud handles three-phase monitoring well.

Where it's less ideal: the battery is tied to the SBR, and the range starts around 8kW, which is more inverter than a small three-phase system needs. Some Perth installers instead pair a Sungrow string inverter with an AC-coupled battery on smaller three-phase homes.

Fronius Symo GEN24 Plus three-phase hybrid

The residential three-phase Fronius hybrid is the Symo GEN24 Plus, spanning roughly 3 to 12kW. It pairs with the BYD Battery-Box Premium HVS or HVM, DC-coupled, and the Fronius Ohmpilot can be added to divert excess solar into hot water.

Specs for the Symo GEN24 Plus 10.0:

• Max output: 10kW
• MPPT inputs: 2
• Peak efficiency: 98.2%
• Battery: BYD Battery-Box Premium HVS or HVM, DC-coupled

What people like about it:

• Fronius Solar.web is one of the most-liked monitoring platforms among Perth owners.
• The BYD Battery-Box Premium range gives you more capacity steps than the SBR.
• Three-phase Full Backup during a grid outage on the 6.0-12.0 Plus models (not available on the smaller 3.0-5.0 Plus units), when you enable the energy-reserve function and install the Backup Interface Box.
• The Ohmpilot puts leftover solar into your hot water instead of exporting it cheaply.

Where it's less ideal: the battery is locked to the BYD HVS/HVM ecosystem, and a Fronius setup is typically priced above an equivalent Sungrow SH configuration.

SolarEdge three-phase

SolarEdge's three-phase hybrids that can run a battery are the residential SE5K, SE7K, SE8.25K and SE10K models. These are the ones to look at for a Perth solar-plus-battery system. SolarEdge also makes larger commercial three-phase inverters, up to the SE27.6K, but those are non-hybrid string inverters, so don't let a larger model number on a spec sheet fool you into thinking it's a bigger home battery inverter.

SolarEdge works differently to Sungrow and Fronius. Each panel gets its own optimiser (that's module-level power electronics, or MLPE), so one shaded panel doesn't drag down the rest of its string.

What people like about it:

• Per-panel optimisers suit shaded, split, or complex three-phase roofs.
• SafeDC shuts down panel voltage at the roof for safer maintenance and callouts.
• Panel-level monitoring, so you can see exactly which panel is underperforming.

Where it's less ideal: the SolarEdge Home Battery is quoted less often in Perth at three-phase than the Sungrow or Fronius options, so many SolarEdge quotes come solar-only with an AC-coupled battery added separately. The optimisers also add hardware cost, so a SolarEdge system usually sits above a Sungrow SH or Fronius Symo build.

When does three-phase matter most for a battery?

A battery on a three-phase home earns its keep when it can balance stored energy across all three phases, not just feed one.

A three-phase hybrid, like the Sungrow SH RT with an SBR, or the Fronius Symo GEN24 Plus with a BYD: the inverter manages battery charge and discharge across all three phases. Appliances on any phase can draw from the battery, so the stored energy actually reaches your whole house.

An AC-coupled battery, like a Tesla Powerwall, on a three-phase home: the Powerwall connects to a single phase. Loads on the other two phases can't pull from it directly; they draw from the grid instead. If your big loads happen to sit on the one phase, that's fine. But if your ducted air conditioning, workshop, and EV charger are spread across different phases, a three-phase hybrid with its own battery reaches all of them, and an AC-coupled single-phase battery doesn't.

If you're weighing up how the battery connects, our guide to AC-coupled versus DC-coupled batteries in Perth goes through the trade-offs in more detail.

What size three-phase system suits a Perth home?

These are typical starting points, not fixed rules. Your roof space, your usage, and your budget move the numbers.

For sizing the inverter against your panel array, our solar inverter sizing guide for Perth covers how much you can safely oversize the panels.

What are the Western Power connection rules for three-phase?

Every solar and battery install in Perth needs Western Power approval before it's connected. Single-phase and three-phase homes both go through it, and your installer lodges it for you.

For three-phase systems, the numbers to know are:

• Aggregate capacity limit: 30 kVA across the whole system.
• Single-phase inverter cap: 10 kVA on any one phase.
• Phase imbalance: the difference between your phases can't exceed 5 kVA.

Those imbalance and per-phase limits are a big part of why larger systems go three-phase in the first place: spreading the inverter capacity across three phases keeps you inside the per-phase rules. The rules do change from time to time, so treat these as the current thresholds and let your installer confirm what applies on the day. Our rundown of the new WA inverter rules for 2026 covers the wider connection changes.

How do the three options compare?

• Cheapest, most-quoted, battery locked to one brand: Sungrow SH RT with the SBR. The default starting point for most three-phase Perth quotes, especially if you want a simple, well-supported setup.
• Best monitoring, flexible battery capacity, hot-water diversion: Fronius Symo GEN24 Plus with a BYD Battery-Box. Usually priced above the equivalent Sungrow, and worth it if Solar.web and the Ohmpilot matter to you.
• Best for shade and complex roofs: SolarEdge three-phase with per-panel optimisers. The battery is quoted less often here, so expect a solar-only quote with an AC-coupled battery bolted on.

For the most common head-to-head, our Fronius GEN24 versus Sungrow SH comparison digs into the detail. If you're still deciding whether a hybrid is right at all, start with the Perth hybrid inverter guide. And if the battery-versus-inverter ecosystem is the sticking point, Sungrow SBR versus BYD compares the two batteries most often paired with these inverters.

A practical way to shop it: price the Sungrow SH RT first, then put a Fronius Symo GEN24 Plus quote next to it. Ask both installers for the same solar size and battery capacity so you're comparing like for like. From there, let monitoring, battery flexibility, and roof shading break the tie.