Updated June 2026 | Positive Energy Solutions — Fronius Solutions Partner Plus, Perth WA
The Fronius GEN24 Plus is the inverter at the centre of every Fronius-based solar and battery system Positive Energy Solutions installs. It is Austrian-engineered, IP66-rated for outdoor installation, and carries a 10-year warranty with registration. It is one of the most rigorously tested hybrid inverters available to Perth homeowners in 2026.
This is a detailed review from the installer’s perspective. It covers what the GEN24 Plus does, and how it compares to the standard GEN24. It covers which batteries it pairs with, how it performs under Perth conditions, and what the complete system looks like once installed.
GEN24 vs GEN24 Plus: Which One and Why It Matters
Fronius makes two versions of the GEN24 — the standard GEN24 and the GEN24 Plus. The distinction is important and often misunderstood.
The GEN24 is a solar inverter without a battery port. It cannot connect a battery for overnight storage or provide backup power.
The GEN24 Plus adds the battery connection port and backup capability. With a compatible battery and a backup switching device, it provides essentials backup. This applies to the Primo (all single-phase sizes) and the Symo 6–10 kW. The Primo GEN24 Plus 10kW also supports whole-home backup. This covers large loads like air conditioning and heat pumps, during a grid outage, day or night. Positive Energy Solutions does not offer backup with the Symo GEN24 Plus 3–5 kW.
Fronius offers a clear upgrade path. You can convert the GEN24 to GEN24 Plus functionality via the Fronius UP.storage software upgrade. It is available at approximately $900 through the Fronius webshop. This unlocks the battery port and Full Backup capability without replacing the inverter hardware. This makes the GEN24 a practical choice if budget is a constraint at install time, and you plan to add a battery later.
At Positive Energy Solutions, we install the GEN24 Plus as standard. Every system includes a battery, and the GEN24 Plus is the inverter that makes the complete system work.
Positive Energy Solutions does not offer backup with the Symo GEN24 Plus 3–5 kW three-phase models. A backup switching device is required, in addition to the inverter and battery, for all backup configurations.
Technical Specifications
The GEN24 Plus is available in two form factors: the Primo (single-phase) and the Symo (three-phase). Both use the same core inverter architecture and monitoring platform. The three-phase Symo suits larger homes or properties with three-phase grid connections.
Specifications from Fronius AU official datasheet, June 2026. DC input voltage range for single-phase: 65–600V. Three-phase: 80–1,000V. Active cooling extends inverter service life in high-ambient-temperature environments.
A few specs worth calling out specifically for Perth conditions:
- IP66 rating: fully protected against dust and high-pressure water jets. Suitable for outdoor wall mounting in exposed locations, including on the external walls common in Perth homes without undercover garaging.
- Active cooling: the GEN24 Plus uses active cooling rather than passive heat dissipation. In Perth’s summer temperatures, routinely 35–45°C, active cooling maintains inverter efficiency and extends component life compared to passively cooled units.
- 2 MPP trackers: two Maximum Power Point Trackers let the inverter handle panels on different roof faces or orientations independently. This optimises output when north and west-facing arrays are combined.
- 10-year warranty: the full 10-year warranty activates when the installer registers the inverter on Fronius Solar.web at commissioning. Positive Energy Solutions handles this registration as part of every installation.
Compatible Batteries
The GEN24 Plus uses a DC-coupled battery connection. This means the battery charges directly from the solar panels via the inverter. This is more efficient than AC-coupled alternatives. It also lets the system recover energy at the clipping point, when the solar array is oversized relative to the inverter’s AC output.
Three batteries are compatible with the GEN24 Plus in the Australian market.
BYD Battery-Box HVM capacity is expandable in 2.76 kWh modules, from 8.3 kWh up to 22.1 kWh per tower. HVS capacity comes in 5.12 kWh modules. All three batteries use LFP chemistry, which carries no thermal runaway risk associated with NMC cells.
BYD Battery-Box HVM — The Primary Pairing
The BYD HVM is the most commonly installed battery with the GEN24 Plus at Positive Energy Solutions. It starts at 8.3 kWh and expands to 66.2 kWh across multiple towers. It is genuinely scalable. It suits a small household adding one module, right through to a large home with significant overnight load or EV charging demand.
The Fronius GEN24 Plus and BYD Battery-Box HVM combination has achieved top rankings in the HTW Berlin Energy Storage Inspection. It has done so for five consecutive years. HTW Berlin’s annual study is considered Europe’s most rigorous independent assessment of residential PV storage system efficiency. Five top rankings in a row is strong independent validation of the pairing’s real-world performance.
BYD Battery-Box HVM uses LFP (Lithium Iron Phosphate) chemistry. This is the same chemistry used in many utility-scale storage installations. LFP does not carry the thermal runaway risk associated with NMC (Nickel Manganese Cobalt) cells, used in some competing battery products.
Fronius Reserva
The Fronius Reserva is Fronius’s own battery platform, designed specifically to pair with the GEN24 Plus. It is available in 5–15 kWh configurations. It offers a clean single-brand ecosystem. It suits medium-sized Perth households well, where 10–15 kWh of storage covers most evening load without oversizing.
The Reserva also supports Full Backup capability with the GEN24 Plus. This makes it a complete all-Fronius backup solution for households where brand consistency and single-vendor support are priorities.
How the GEN24 Plus Performs Under Perth Conditions
Perth’s solar resource is exceptional, and its tariff structure is distinctive. Synergy’s DEBS feed-in rate of 2c/kWh means exported solar is nearly worthless. The A1 import tariff of 33.26c/kWh makes every unit of solar consumed at home significantly more valuable than grid electricity. The same is true for solar stored for evening use.
The GEN24 Plus is well-suited to this environment for several reasons:
- DC clipping recovery: Perth’s high irradiance means that on most summer days, a correctly oversized array pushes more DC power through the inverter than it can export on the AC side. Rather than losing that energy as heat (clipping), the GEN24 Plus diverts surplus DC directly into the battery, recovering it for evening use. This is a meaningful performance advantage over AC-coupled systems.
- Two MPP trackers: Perth roofs often combine north and west-facing panels to extend the afternoon generation window. Two independent MPP trackers mean the inverter optimises each string separately. The west-facing panels keep generating efficiently into the afternoon, even as the north-facing string declines.
- Load management integration: the GEN24 Plus supports open-interface integration with third-party devices. These include pool pumps, hot water systems, and EV chargers. This lets surplus solar go to high-draw appliances automatically, before storing the remainder in the battery.
- CSIP-AUS compliance: all GEN24 Plus inverters installed by Positive Energy Solutions are commissioned to the Australia Region B grid profile. CSIP-AUS communications are enabled. This satisfies Western Power’s May 2026 remote management requirements, and is required for Synergy Battery Rewards VPP eligibility.
Backup Power: What the GEN24 Plus Can and Cannot Do
The GEN24 Plus provides two distinct backup modes, and it is important to understand what each one covers.
PV Point — Basic Backup Without a Battery
The PV Point is a dedicated socket on the GEN24 (and GEN24 Plus). During a grid outage, it can supply up to 3kW of power directly from the solar panels, as long as the sun is shining. This is useful for powering essential items like phone chargers, a modem, or lighting during a daytime outage. But it does not power the whole home, and it provides nothing at night.
PV Point is available on both the GEN24 and the GEN24 Plus. It does not require a battery.
Backup With Battery — Essentials and Whole-Home
With a compatible battery (BYD HVM, HVS, or Fronius Reserva) and a backup switching device installed, the GEN24 Plus can disconnect from the grid. It then powers essential circuits, such as lights, fridge, modem, and medical equipment, from battery and solar combined, day or night. Essentials backup is available on all Primo GEN24 Plus models (single-phase, 3–10 kW) and on the Symo GEN24 Plus 6–10 kW.
Whole-home backup, covering large loads including air conditioning, heat pumps, and cooking, is available on the Primo GEN24 Plus 10kW only. If whole-home backup is a requirement, this is the model to specify.
Positive Energy Solutions does not offer backup with the Symo GEN24 Plus 3–5 kW. These three-phase models have limited backup capability. For three-phase homes where backup matters, we recommend the Symo 6–10 kW for essentials backup. If whole-home backup is the brief, we recommend the single-phase Primo 10kW instead.
Essential Circuits: What Gets Backed Up
For all GEN24 Plus configurations other than the Primo 10kW, backup power covers two or three dedicated circuits, rather than the whole home. The number of circuits depends on the inverter size. A smaller inverter supports fewer backed-up circuits. A larger model has more headroom.
Those circuits are typically chosen to cover the loads that keep a home functional during an outage. These are lighting, the fridge, modem and networking, and a selection of power outlets. High-draw loads sit on the main board and are not backed up. These include air conditioning, electric hot water, induction cooktops, dishwashers, clothes dryers, and EV chargers. Keeping them off the essential circuits is what makes the backup practical. The battery sustains the home through an overnight outage, rather than draining within hours.
Positive Energy Solutions designs the essential circuits subboard as part of every backup installation. We select the right two or three circuits for your household and your inverter size.
Monitoring: Fronius Solar.web
Every GEN24 Plus installation connects to Fronius Solar.web, Fronius’s cloud-based monitoring platform. Solar.web provides real-time and historical data. This covers solar generation, household consumption, battery state of charge, grid import and export, and system efficiency.
Solar.web is accessible via web browser or the Fronius Solar.web app. It is widely regarded as one of the most detailed and user-friendly monitoring platforms in the residential solar market.
Positive Energy Solutions registers every GEN24 Plus installation on Solar.web at commissioning, using the Solar.start app. This registration activates the 10-year warranty. Without it, the default warranty period is shorter. We handle registration as a standard part of every installation.
Sizing the GEN24 Plus for Your Perth Home
Choosing the right inverter size depends on your solar array, your household consumption, and your grid connection type. The GEN24 Plus is available from 3 kW to 10 kW in single-phase (Primo) and 3 kW to 12 kW in three-phase (Symo).
For Perth homes, Positive Energy Solutions typically recommends:
Sizing is indicative. Positive Energy Solutions designs every system to your actual usage data, roof configuration, and Western Power connection capacity. Western Power applies a 1.5kW export limit for inverters larger than 5kW on single-phase connections.
The GEN24 Plus’s 2 MPP trackers give flexibility to combine different panel strings. For example, you can pair a north-facing array generating peak midday output with a west-facing array extending generation into the late afternoon. This is a common configuration in Perth homes. The GEN24 Plus handles it natively, without needing add-on optimisers.
Why Positive Energy Solutions Installs the Fronius GEN24 Plus
Positive Energy Solutions is a Fronius Solutions Partner Plus, Fronius’s highest tier of installer accreditation in Australia. This means our installation team is trained and assessed by Fronius directly. We have access to Fronius technical support and stock availability that non-accredited installers do not.
We install the GEN24 Plus for several reasons. It has an independent performance record, with five consecutive top rankings in the HTW Berlin study with BYD. It offers genuine Full Backup capability, open-interface integration with third-party devices, and a 10-year warranty backed by Fronius’s Australian service network.
Fronius has been manufacturing solar inverters since 1995. Their Australian support infrastructure is well established. This includes service centres, spare parts availability, and warranty response, genuinely tested over decades of Australian installations.
Every Positive Energy Solutions installation includes system design to your usage data. It includes full commissioning, with Solar.web registration and warranty activation. It also includes CSIP-AUS setup for Synergy Battery Rewards eligibility, and ongoing monitoring support.
Get a Fronius GEN24 Plus Quote from Positive Energy Solutions
If you are considering a Fronius-based solar and battery system for your Perth home, talk to us. We will design the right system for your usage, roof, and budget. We handle every step, from Western Power and Synergy applications through to commissioning and VPP connection.
Request a quote online or call us to speak with a Positive Energy Solutions system designer.
Related guides
- Fronius GEN24 PLUS Backup Power for Perth Homes
- Fronius GEN24 Plus and Reserva: Why the Inverter and Battery Work Best Together
- Fronius Verto Plus Perth 2026: Full Home Backup for Three-Phase Homes
- Which Fronius Inverter Is Right for My Perth Home? Primo GEN24 Plus vs Symo GEN24 Plus vs Verto Plus — 2026 Guide
Frequently Asked Questions
What is the difference between the Fronius GEN24 and GEN24 Plus?
The GEN24 is a solar inverter without a battery port or backup power capability. The GEN24 Plus adds a DC-coupled battery port and backup power capability. With a compatible battery and backup switching device, the GEN24 Plus can power essential circuits during a grid outage. Select models and configurations support whole-home backup. You can upgrade the GEN24 to GEN24 Plus via the Fronius UP.storage software upgrade (approximately $900), without replacing the inverter hardware.
Which batteries work with the Fronius GEN24 Plus?
The GEN24 Plus is compatible with BYD Battery-Box HVM (8.3–66.2 kWh), BYD Battery-Box HVS (5.1–25.6 kWh), and Fronius Reserva (5–15 kWh). All three use LFP chemistry and all support Full Backup capability with the GEN24 Plus.
Does the Fronius GEN24 Plus work in a blackout?
Yes, with a compatible battery and backup switching device installed. The Primo GEN24 Plus (all single-phase sizes) and Symo GEN24 Plus 6–10 kW provide essentials backup, such as lights, fridge, modem, and similar loads. Whole-home backup, covering large loads like air conditioning, is available on the Primo GEN24 Plus 10kW only. Positive Energy Solutions does not offer backup with the Symo GEN24 Plus 3–5 kW. We will advise which configuration suits your home.
What warranty does the Fronius GEN24 Plus carry?
The GEN24 Plus carries a 10-year warranty when registered on Fronius Solar.web at commissioning. Positive Energy Solutions handles this registration as part of every installation. Without registration, the warranty period is shorter. Registration is not optional.
Is the Fronius GEN24 Plus compatible with Western Power’s May 2026 requirements?
Yes. All GEN24 Plus inverters installed by Positive Energy Solutions are commissioned to the Australia Region B grid profile, with CSIP-AUS communications enabled. This satisfies Western Power’s May 2026 requirements for remote management capability, and is required for Synergy Battery Rewards VPP participation.
What monitoring does the Fronius GEN24 Plus include?
All GEN24 Plus systems connect to Fronius Solar.web. This provides real-time and historical data on solar generation, consumption, battery charge, and grid import/export, via web browser and mobile app. Monitoring is set up at commissioning, and is included as standard with every Positive Energy Solutions Fronius installation.
Does Positive Energy Solutions install both single-phase and three-phase GEN24 Plus systems?
Yes. Positive Energy Solutions installs the Primo GEN24 Plus (single-phase, 3–10 kW) and Symo GEN24 Plus (three-phase, 3–10 kW). The Primo provides essentials backup across all sizes. The Symo 6–10 kW provides essentials backup. Whole-home backup is available on the Primo GEN24 Plus 10kW only. We do not offer backup with the Symo GEN24 Plus 3–5 kW.
Specifications sourced from Fronius AU datasheet, June 2026. Rebate values and tariff rates subject to change — confirm current figures with Positive Energy Solutions at time of quote.
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.
