Fronius Reserva Battery Perth: 9.5 to 15.8 kWh, supplied and installed

What the Fronius Reserva is, and the range we install in Perth

The Fronius Reserva is a home battery built as a tower. Each tower is a stack of 3.15 kWh lithium iron phosphate modules, two to five high, on one base. In Perth we supply and install the 9.5, 12.6 and 15.8 kWh towers with the Fronius GEN24 Plus hybrid inverter, from $9,390 after the WA and Federal rebates.

Fronius is an Austrian family company. It has made solar inverters since the 1990s and has been in Australia since 2009, with an office in Subiaco. Fronius designed the Reserva for its own hybrid inverters. For you, that means one app to open and one maker to call. The inverter, the battery and the app were built to work together from the start.

Your panels make DC power. Your home runs on AC power. The inverter’s job is to turn one into the other, and every time power is converted a little is lost. The Reserva is DC-coupled, which means it is charged straight from the panels before the inverter does that conversion. The power is converted once, on its way into the house, so less is lost and more of the solar you make ends up as power you use. Fronius rates the battery at 95 per cent efficiency at 0.2C, and you can use 94.5 per cent of what it holds.

The cells are lithium iron phosphate, the chemistry used in home batteries because it is stable and long-lived. They are tested to IEC 62619:2022, which includes the thermal runaway test: the check that one hot cell cannot set off the cells beside it.

Every tower is 772 mm wide and 176 mm deep, and only the height changes with the size. It is IP65 rated, which means it is sealed against dust and water jets, so it suits a garage wall or a covered spot outside. The datasheet lists China as the country of manufacture. The design, the software and your data are handled by Fronius in Austria.

Figures from the Fronius Reserva datasheet, EN_AUS V05, May 2026. The power a tower can charge or discharge at depends on the temperature, how full it is, and the inverter it is connected to, which sets the limit. Our range starts at the 9.5 kWh tower. Prices are our shop’s figures, checked on 21 September 2026.

How the Fronius Reserva works: the Solar.web app and a Perth blackout

On a normal day you do nothing. The panels power the house first. What is left over charges the Reserva. Once the battery is full, the rest goes to the grid, up to Western Power’s export limit. After sunset the battery runs the house until it is empty or the sun comes back.

The Fronius Solar.web app puts it all on one screen: what the panels are making, how full the battery is, what the house is using, and what is going to or coming from the grid. It is one app for the inverter and the battery. Our guide to the GEN24 Plus and Reserva as one system goes deeper. If a storm is forecast, the app’s battery control charges the Reserva to full and holds it there for 24 hours. One thing you will see that is normal: every two months or 50 cycles, the Reserva runs a calibration charge to 100 per cent and back down to zero. That keeps its gauge accurate.

PV Point or Full Backup: what actually runs in a blackout

Fronius offers two levels of backup. PV Point is built into every GEN24 Plus. It powers one fused outlet or circuit, up to 3 kW, single phase, and needs no battery. Think fridge, router and phone chargers. It switches over in under 15 seconds.

Full Backup is what most Perth homes ask for. It needs the GEN24 Plus, the Reserva and a Fronius Backup Controller in the switchboard. When the grid drops out, the controller disconnects your home from the street on its own and hands it to the battery and panels in about ten seconds. When Western Power restores supply, it reconnects. On our pricing it is an optional extra from $2,290. How much of the house it covers depends on the inverter. A Primo GEN24 10 kW Plus (single phase) or a Verto Plus (three phase) backs up the whole home. The other GEN24 Plus sizes back up essential circuits: two on a 5 kW single-phase inverter, and one per phase on a 10 kW three-phase Symo.

If a long outage runs the battery flat overnight, the system starts itself again when the first sun hits the panels. Fronius calls this black-start capable. On a whole-home system, lights, fridge, Wi-Fi and TV run without a second thought. Ducted air conditioning runs with care, one large load at a time. The oven, the pool pump and the EV charger wait for the grid. Our GEN24 Plus backup guide has the full appliance table.

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Which Fronius Reserva suits your Perth home

The right size is set by how much power your home uses between sunset and sunrise. That is the power the battery has to cover. Your consultant works it out from your Synergy bill and from where your home is heading: a growing family, an electric car, or going all-electric.

Single phase: the Fronius Reserva stops at 9.5 kWh a tower

Most Perth homes are single phase, so they run the Primo GEN24 Plus. The Primo takes the 9.5 kWh tower; the 15.8 kWh tower runs at a voltage above the Primo’s range, which is fixed in the hardware. Need more storage on single phase? Add another tower beside the first. Up to four towers connect together, for 38.4 kWh in all.

Three phase: up to 15.8 kWh a tower and 63 kWh in all

A three-phase home runs a Symo GEN24 Plus or a Verto Plus. Either takes the full 15.8 kWh tower, and four towers together give 63 kWh.

Adding modules later

You can start at 9.5 kWh and add modules later, within limits. Fronius asks that a new module is added within two years and before the tower has done 300 cycles. Add one later than that and the whole tower runs at the health of its oldest module. If you think you will want a bigger battery, our advice is to size it now while the rebates are at this year’s rate.

The inverters that run the Reserva: Fronius GEN24 Plus and Verto Plus

The battery is only half the system. The inverter is the other half, and it decides how fast the battery can charge and discharge. Fronius makes three that take the Reserva; our Fronius inverter page covers the full range. All three are made in Europe, with production at Sattledt, Austria, and are IP66 rated, so they can be mounted outside. Each carries a 10-year Fronius Warranty Plus once it is registered on Solar.web. Each meets CSIP-AUS, the standard Western Power has required on new connections since May 2026.

Primo GEN24 Plus is the single-phase inverter, sold in sizes from 3 to 10 kW, with two MPP trackers so your panels can face two directions. The size you choose sets how fast the battery can charge and discharge, whatever the battery’s own rating says. A Primo 5.0 Plus moves up to 5,170 W into or out of the battery; a 10.0 Plus moves up to 10,360 W. For most homes the 5 kW is the right pick, because it keeps Synergy’s DEBS export credit. The 10 kW is the one to choose if you want whole-home backup on single phase.

Symo GEN24 Plus is the three-phase inverter, 3 to 10 kW. Full Backup is available on the 6, 8 and 10 kW sizes only, and it is limited to 3,680 VA per phase. That covers the circuits that matter, so on a Symo we design backup for essential circuits.

Verto Plus is the three-phase inverter for a home that wants everything backed up. It runs from 15 to 33.3 kW, has three MPP trackers, and gives Full Backup across all three phases. Its Backup Power Boost lifts output to 30 kVA for a moment, long enough for an air conditioner compressor or a bore pump to start. It takes the same Reserva towers. Our guide to the three inverters goes deeper.

Already have a GEN24 without the Plus? Fronius offers a software upgrade called UP.storage that switches on the battery port and Full Backup. A photo of the sticker on your inverter tells us which one you have. If you drive electric, the Fronius Wattpilot EV charger pairs with the GEN24 Plus and charges the car from your solar.

What a Fronius Reserva costs in Perth, and the rebates

The 9.5 kWh is from $9,390, the 12.6 kWh from $12,490 and the 15.8 kWh from $13,690, after the WA and Federal rebates. Those prices are for adding the battery to a compatible Fronius GEN24 inverter with a smart meter already in place, anywhere between Yanchep and Mandurah. Backup is an optional extra from $2,290. The three sizes are listed in our Fronius battery-only packages. Switchboard work, a difficult cable run or a double-storey home changes the figure. Starting from scratch? A 6.6 kW system with SunPower panels (see our solar panels page) plus a Reserva 9.5 kWh is from $14,090 on our solar system prices page.

The two rebates on a Fronius Reserva

The Reserva is on the Clean Energy Council approved list, so it qualifies for both rebates. The Federal Cheaper Home Batteries Program takes roughly 30 per cent off the price. Since 1 May 2026 the full rate applies to the first 14 kWh of a battery, with a smaller rate above that. The WA Residential Battery Scheme pays Synergy customers $130 for every usable kWh, up to $1,300. To get it, you join the Synergy Virtual Power Plant, which can call on your battery up to 30 times a year, and you can opt out after two years. A WA no-interest loan up to $10,000, powered by Plenti, lets you pay the rest over time. As a New Energy Tech Approved Seller we claim both rebates and take them off your price up front. Both rebates step down on 1 January 2027, so this year’s price is the better one. The current rules are on our WA solar and battery rebates page.

Why a battery pays in Perth

Any solar system above 5 kW in Perth is held to Western Power’s 1.5 kW export limit. Solar you cannot send to the grid is solar you either use on the spot or lose. With a Reserva, it goes into the battery instead. Selling it is worth little in any case: Synergy’s DEBS pays 10 cents for a kWh exported between 3 pm and 9 pm, and 2 cents at any other time. On the Midday Saver tariff, a battery that fills in the low-cost middle of the day and runs the house through the expensive evening is exactly what the plan was built for. Our export limiting guide shows how a battery changes the picture.

Four steps to your solar and battery installation

Positive Energy are your local, premium solar and battery experts. We make the path to installing a solar and battery system clear: assessment, applications, install and savings. Our team of experts handle the detail so you can enjoy a premium system with confidence.

Assessment

Request Your Quote and one of our Energy Consultants will help evaluate your individual property needs and requirements.

Applications

Once you have placed your order, we handle the applications on your behalf. Including Western Power, Synergy and applying for the Government Solar Rebates.

Install

Your new solar and battery system is installed by our accredited installers and signed off to Positive Energy’s completion standards, with your monitoring set up before we leave.

Savings

Harness the sun’s energy to power your home and enjoy your ongoing savings. Remember we are always here to help.

The one decision to make early is where the tower will go. It can go indoors or in a protected spot outside, such as under an eave or a carport roof. It sits out of the weather and direct sun, with two metres of clearance from anything hot, such as a hot water unit. In Perth the usual answer is the garage wall beside the inverter. One in four batteries we install is added to an existing system, so our crews have seen most switchboards. If you would like to see a Reserva before you decide, visit our Osborne Park showroom, Monday to Friday 8am to 4pm. The full range is on our solar batteries page.

Fronius Reserva warranty and support, in plain words

Two conditions are worth knowing. The warranty holds as long as a battery that runs flat is charged again within 14 days. And a module added after the two-year window takes on the health of the older modules beside it.

Fronius Reserva 9.5 vs 12.6 vs 15.8: the range compared

All three towers share the same modules, the same footprint, the same warranty and the same app. Only the height changes. Whichever tower you choose, the inverter sets how fast it can charge and discharge. The battery’s output is capped at 32 A, so even four 15.8 kWh towers together charge and discharge at about 16.4 kW.

Why Positive Energy for your Fronius Reserva

We are a WA owned and operated solar and battery company based in Osborne Park. We are also a Fronius Solutions Partner Plus, Fronius’s top partner tier. Every Reserva system is designed by our own consultants, installed by our accredited installers and signed off to Positive Energy’s completion standards, and looked after from day one by Positive Energy Protection, Powered by Omnidian.

SolarQuotes rates us Legendary and ranked us Perth’s number one solar company in 2023 and 2024. SunWiz named us the 2026 Local Solar Hero for Perth Inner and the number three battery installer in WA, number two the year prior. We were on the AFR Fast Starters list in 2024. We design, supply and support every system we sell, and the same team is here for you after the install.

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Fronius Reserva Perth: your questions answered