If you are researching solar and battery systems for your Perth home, you will come across the term hybrid inverter early in the process. Most people understand roughly what an inverter does. It converts solar power into electricity your home can use. What a hybrid inverter does differently, and why it matters, is less often explained clearly.
Understanding the difference between a standard inverter and a hybrid inverter helps you understand how a solar and battery system actually works. It also explains why getting the battery at the same time as your solar installation is the right decision for most Perth households.
What a Standard String Inverter Does
A standard string inverter, sometimes called a grid-tie inverter, has one job. It converts the direct current (DC) electricity generated by your solar panels into alternating current (AC) electricity. Your home can use this AC electricity, and it can be exported to the Synergy grid.
Solar panels produce DC power. Your household appliances, lights, and the grid all run on AC. The inverter sits between the two, converting power as your panels generate throughout the day. It is a well-understood, reliable piece of gear, and it has been the standard in residential solar for decades.
The limit of a standard string inverter is simple: it has no way to connect to a battery. There is no DC battery port, no battery management system, and no logic for deciding when to charge or discharge storage. It converts power in one direction, from panels to home and grid, and that is all it does.
What a Hybrid Inverter Does Differently
A hybrid inverter does everything a standard string inverter does, and adds battery management on top. It converts DC power from your solar panels to AC for your home. It also manages a connected battery, charging it from solar generation during the day and discharging it to power your home in the evening when the panels stop producing.
The battery in a hybrid system connects on the DC side, before the inverter converts power to AC. This is called DC coupling. The solar panels charge the battery directly in DC. The inverter then handles the conversion to AC for household use and for any grid export. DC coupling is efficient because it avoids the energy losses that come from needlessly converting power back and forth between AC and DC.
A hybrid inverter also includes the logic to decide, in real time, how much power to draw from panels, how much to store in the battery, how much to supply to the home, and whether to export any excess to the grid. Modern hybrid inverters do this automatically, adjusting around your generation, your usage, and your tariff.
- Standard string inverter: Converts solar DC to AC. No battery connection. One direction.
- Hybrid inverter: Converts solar DC to AC, manages battery charging and discharging, optimises energy flows between panels, battery, home, and grid.
DC Coupling vs AC Coupling: Why It Matters
There are two ways to add a battery to a solar system. One is DC coupling through a hybrid inverter. The other is AC coupling, where the battery connects on the AC side of an existing standard inverter. Understanding the difference helps explain why a hybrid inverter is the preferred approach.
DC Coupling (Hybrid Inverter)
The solar panels generate DC power. The hybrid inverter charges the battery directly from that DC power, then converts what is needed to AC for the home. The energy path is clean and efficient: DC in, battery charged in DC, AC out once. This is the standard approach for new solar and battery installations.
AC Coupling (Existing Standard Inverter)
Where a household already has a standard string inverter and wants to add a battery, AC coupling lets a battery connect on the AC side. The panels generate DC. The existing inverter converts it to AC. The battery charger converts it back to DC to charge the battery. The battery inverter then converts it back to AC when discharging. That is two extra conversion steps compared to DC coupling, and each one loses some energy.
AC coupling is a valid solution in some cases, particularly for households with a newer standard inverter that is performing well and not due for replacement. But for new installations, DC coupling through a hybrid inverter is the more efficient and cleaner approach. For a detailed technical comparison, see our guide: DC-Coupled vs AC-Coupled Solar Batteries.
Get the Battery Now — Not Later
The most common question Positive Energy Solutions hears about batteries is this: can I add one later? The answer is yes. But the better question is, why wait?
Every month your solar system runs without a battery, excess generation that could be stored is instead exported to the Synergy grid at the DEBS off-peak rate of 2 cents per kilowatt-hour. That same kilowatt-hour, stored and used in the evening, replaces grid electricity that costs more than 33 cents. The difference is more than 30 cents per kilowatt-hour, every day, every month, for as long as you are without a battery.
Adding the battery at the same time as solar also means the hybrid inverter is specified and sized for the complete system from day one. The installer visits once. The switchboard is assessed once. The grid connection application covers the full set-up. There is no second call-out cost, no second switchboard assessment, and no question about whether your existing inverter will work with the battery you want to add two years later.
Installing solar without a battery is still better than no solar at all. But for Perth households making the investment now, including the battery from the start is the decision that makes the most financial sense.
The Hybrid Inverters and Battery Systems Positive Energy Solutions Installs
Positive Energy Solutions works with a range of hybrid inverter and battery systems, each suited to different household sizes, backup requirements, and budgets. Here is an overview of each.
Fronius GEN24 PLUS + Reserva
The Fronius GEN24 PLUS is a premium hybrid inverter from one of the most respected names in solar electronics. It pairs with the Fronius Reserva battery to form an integrated system. This system offers smart energy management, full backup capability, and a strong track record in the Australian market. The GEN24 PLUS is available in a range of sizes to suit different system set-ups.
See our full guide: Fronius GEN24 PLUS Reserva Integrated System.
SigEnergy SigenStor
The SigEnergy SigenStor is an integrated AI energy management system. It combines a hybrid inverter, battery storage, and smart load management in a single platform. SigEnergy supports three-phase power and modular battery expansion up to 54kWh (subject to WA’s three-stack limit). It also includes a 25kW bidirectional DC EV charger as part of the ecosystem. The system’s AI optimises energy flows across generation, storage, household consumption, and EV charging.
See our full guide: SigEnergy SigenStor AI Energy Management.
Sungrow Hybrid
Sungrow is one of the world’s largest inverter manufacturers, with a strong presence in the Australian market. The Sungrow hybrid inverter pairs with the SBR (single-phase) and SBH (three-phase) battery range. This offers modular scalability from 9.6kWh up to 100kWh. It is a well-supported, competitively priced option for a wide range of household sizes.
See our full guide: Sungrow SBR SBH Battery Sizing.
Tesla Powerwall 3
The Tesla Powerwall 3 takes a different approach. The inverter is built directly into the battery unit itself, combining what would otherwise be separate components into a single integrated system. This means the Powerwall 3 is both the inverter and the battery. It connects directly to your solar panels on one side and your home on the other. It is a clean, compact solution with strong backup capability and native integration with the Tesla app ecosystem.
See our full guide: Tesla Powerwall 3 Whole Home Backup.
BYD Battery-Box HVM
The BYD Battery-Box HVM is a modular high-voltage battery that pairs with a compatible third-party hybrid inverter. BYD’s lithium iron phosphate (LFP) chemistry offers strong cycle life and a solid safety record. The HVM range scales from 5.1kWh per module up to 66.3kWh across multiple towers. This makes it one of the most scalable options available for larger households or higher storage requirements.
See our full guide: BYD Battery-Box LFP Chemistry.
iStore Battery
The iStore battery system integrates with compatible hybrid inverters. It is part of iStore’s broader home energy management platform, the same brand as the iStore heat pump hot water system. For households installing iStore heat pump hot water as part of a full electrification bundle, the iStore battery offers a unified monitoring and control experience across hot water, solar, and storage.
See our full guide: iStore Battery — Australian Owned Perth Supported.
How to Know If Your Existing Inverter Is Hybrid
If you already have solar and are wondering whether your existing inverter is hybrid, the simplest check is the brand and model number. This is usually on a sticker on the front or side of the unit.
- Fronius GEN24 PLUS: Hybrid. Battery-ready.
- Fronius Symo or Primo (older models): Standard string inverters. Not hybrid.
- SigEnergy hybrid inverter: Hybrid. Part of the SigenStor system.
- Sungrow SH series: Hybrid. Battery-ready.
- Sungrow SG series: Standard string inverter. Not hybrid.
- Tesla Powerwall 3: Inverter and battery combined. Hybrid by design.
- Goodwe ES or EH series: Hybrid. Battery-ready.
- Most SMA, ABB, and older Fronius models: Standard string inverters. Not hybrid.
If you are not sure, Positive Energy Solutions can identify your inverter type during a site assessment and advise on your options for adding battery storage.
Related guides
- Grid-Tied vs Hybrid vs Off-Grid Solar Perth 2026: The Honest Comparison
- Hybrid Solar Systems Perth 2026: How They Work, What They Cost, and Why Every PES Installation Is One
- Which Fronius Inverter Is Right for My Perth Home? Primo GEN24 Plus vs Symo GEN24 Plus vs Verto Plus — 2026 Guide
- Adding a Battery to Your Existing Solar System in Perth: 2026 Costs, Rebates, and Inverter Compatibility Guide
Frequently Asked Questions
Can I add a battery without a hybrid inverter?
Yes. Through AC coupling, a battery can be added to a system with a standard string inverter. However, AC coupling involves extra energy conversion steps that reduce efficiency compared to DC coupling through a hybrid inverter. For new installations, a hybrid inverter and battery together is the preferred approach. For existing systems with a newer standard inverter, AC coupling may be the right fit. Speak to a Positive Energy Solutions energy consultant about your specific situation.
Is a hybrid inverter more expensive than a standard inverter?
Yes. A hybrid inverter carries a premium over a standard string inverter. However, adding a battery later with a standard inverter often means replacing the inverter anyway. When you account for that cost, the total cost over the life of the system often favours starting with a hybrid. The savings from having a battery from day one, rather than adding one later, make the extra cost easy to justify.
What happens if my hybrid inverter fails, do I lose the battery too?
In most hybrid systems, the inverter and battery are closely linked. This means an inverter fault will affect the battery’s ability to charge and discharge. This is why inverter warranty and manufacturer support matter. Positive Energy Solutions installs hybrid inverters from makers with a genuine Australian presence and local support. If a fault comes up, the warranty process is easy to access and the repair path is clear.
Does a hybrid inverter affect my DEBS eligibility?
DEBS export payments apply to inverters rated at 5kW or under, regardless of whether the inverter is hybrid or standard. A hybrid inverter within that capacity limit is eligible for DEBS in the same way a standard string inverter would be. If your hybrid inverter is larger than 5kW, DEBS export payments do not apply. Your energy consultant will explain the trade-offs during system design.
Which hybrid inverter does Positive Energy Solutions recommend?
The right hybrid inverter depends on your household’s energy profile, whether you are single-phase or three-phase, your backup power needs, and your budget. Positive Energy Solutions works with Fronius, SigEnergy, Sungrow, Tesla, BYD, and iStore. We recommend the system best suited to your specific situation. There is no single right answer across all households. This is why the consultation process starts with understanding your energy picture before recommending equipment.
Ready to Design Your Solar and Battery System?
Understanding how a hybrid inverter works is the first step. The second is designing a system that is right for your home, sized correctly, with the right battery capacity, and set up to maximise your return from day one.
Positive Energy Solutions designs and installs complete solar and battery systems across Perth. One consultation, one installation, one system that starts paying for itself right away.
About the Author
Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA
Jason has been at the centre of Western Australia’s energy transition for over a decade. As Orchestration Lead on Project Symphony — WA’s largest virtual power plant pilot — and Stream Lead on Project Encore, he worked directly with AEMO, Western Power and Energy Policy WA to shape how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS, now mandatory for all new WA grid connections. He also led Emergency Solar Management (ESM), the first program of its kind in WA, VPP for Schools (VPP4S), which provided direct market benefits through Supplementary Reserve Capacity, and REBAR, the WA Residential Battery Rebate scheme.
His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute, where he co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading, published in the journal Urban Planning in 2018.
At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps, and holds partner accreditations with Fronius, SigEnergy, iStore and SunPower. Connect with him on LinkedIn.
