Straight answers to common questions about solar battery storage, VPP enrolment, rebate eligibility and installation for Melbourne homes and businesses.
A solar battery stores surplus solar energy during the day and releases it when you need it, reducing what you import from the grid in the evenings.
Without a battery, surplus solar is exported to the grid for a small feed-in credit. A battery stores that energy for use in the evening when panels stop generating. It charges automatically from surplus solar, discharges when grid import would otherwise begin, and can also charge from the grid at off-peak rates.
What is the difference between nominal capacity and usable capacity?
Usable capacity, not nominal capacity, is what you can actually draw from a battery, and it is the correct figure to compare between brands.
Nominal capacity is the total energy a battery can store. Usable capacity is what you can actually draw, after the depth of discharge limit. A 15 kWh nominal battery at 80% depth of discharge delivers 12 kWh usable. Always compare usable figures between brands. LFP batteries commonly allow 100% depth of discharge, so nominal and usable match.
What is depth of discharge and why does it matter?
Depth of discharge (DoD) is the percentage of a battery's capacity that can be safely drawn down, and a higher DoD means more real energy from the same nominal kWh.
LFP batteries allow up to 100% DoD, so the full nominal capacity is usable. Older NMC chemistry is limited to 80 to 90%. A battery with 13.5 kWh nominal at 100% DoD gives 13.5 kWh usable. A competing battery with 16 kWh nominal at 80% DoD gives only 12.8 kWh usable, despite the higher headline figure.
What does round-trip efficiency mean for a home battery?
Round-trip efficiency measures how much of the energy stored in a battery actually comes back out as usable power, with modern LFP lithium batteries achieving 90 to 95 percent.
If you store 10 kWh and recover 9 kWh, round-trip efficiency is 90%. The remaining 10% is lost as heat during conversion from AC to DC on charge, then DC to AC on discharge. Modern LFP batteries are rated 90 to 95%. The difference compounds over thousands of cycles across the battery's life.
How long does a home solar battery last?
Most current LFP home batteries are rated for over 4,000 daily cycles, equating to more than 10 years of useful life, backed by a 10-year performance warranty.
LFP batteries are rated for at least 4,000 cycles to 80% of original capacity. For a household completing one full cycle daily, that exceeds 10 years. All the brands we commonly quote carry a 10-year performance warranty. Lifespan depends on depth of discharge settings, cycling frequency, and the ambient temperature of the installation location.
Eligibility and Suitability
5 questions
Do I need existing solar panels to add a battery?
Solar panels are not required to install a battery, but the financial return from battery storage is significantly higher when the battery charges from self-generated solar energy.
A battery without solar can charge from the grid at off-peak rates and discharge at peak - a strategy called time-of-use arbitrage - but the return is much stronger when charging from surplus solar you already produce. In practice, most Melbourne battery installs are paired with an existing or new solar system.
How do I know what battery capacity I need for my home?
Battery sizing depends on your household evening energy use, your solar surplus, and whether you want backup capability, not a generic kilowatt-hour default.
Battery sizing depends on your evening energy demand, the size and orientation of your solar array, and whether you want backup capability during outages. Households with air conditioning, electric vehicles, or pool heating have meaningfully different profiles from smaller homes. We review your electricity bills and usage data during the free quote to determine the right capacity.
Are solar batteries suitable for Melbourne apartments or townhouses?
Whether a battery suits your apartment or townhouse depends on your strata rules, access to rooftop solar, and whether there is an appropriate space for installation.
For apartments, the key constraints are strata approval and whether your building has rooftop solar accessible to your tenancy. Some Melbourne buildings are installing shared solar and battery systems at the building level. Townhouse installs are more straightforward, as a townhouse has its own roof, separate meter, and wall space for a battery unit.
Is battery storage suitable for commercial properties in Melbourne?
Commercial battery storage is well-suited to Melbourne businesses facing peak demand charges, critical load requirements, or large daytime solar generation they want to shift to evening use.
The case for commercial battery storage commonly rests on reducing peak demand charges, providing backup power for critical operations, or capturing surplus daytime solar for peak-rate evening use. Demand charges are a significant cost on commercial tariffs - a battery that limits peak grid draw can produce measurable reductions. Commercial sizing is driven by your load profile, tariff structure, and operational priorities.
What is a Virtual Power Plant and am I eligible to join one?
A Virtual Power Plant (VPP) is a network of home batteries that earns credits for participating homeowners when the grid operator draws on stored energy during peak demand events.
A VPP aggregates stored energy from many home batteries into a resource the grid operator can draw on during peak demand. When called on, a small amount of your stored energy is exported. In exchange, the VPP operator credits your account. Eligibility depends on your battery model, electricity retailer, and which programs are currently accepting enrolments in Melbourne.
Installation and the Process
3 questions
How long does a solar battery installation take?
Most residential solar battery installations in Melbourne are completed within a single day, from electrical integration and mounting through to commissioning and handover.
A standard residential battery retrofit typically takes one day from arrival to handover. The work involves mounting the unit, running cabling to your switchboard and existing inverter, completing the electrical connections, and commissioning the monitoring app. Backup configurations require additional hardware and may add a few hours. Commercial installs or full hybrid systems may take two to three days.
What approvals or permits are needed to install a battery in Melbourne?
Battery installations in Victoria require compliance with AS4777 grid connection standards and a grid connection application to your distributor, which the accredited installer handles as part of the job.
Installations in Victoria must meet AS4777 requirements and require notification or application to your electricity distributor. The accredited installer handles this as part of the standard install. A Certificate of Electrical Safety is also required. On strata property, additional consent from the body corporate may be needed. We confirm the approval requirements for your property during the free quote.
What is the difference between a full install and supply-only?
A full install means we manage everything from design and permits through to commissioning, while supply-only means we source and deliver the hardware for your own electrician to install.
A full install is the standard service for most residential customers. We handle everything: assessing your property, sourcing the battery hardware, managing distributor paperwork, completing all electrical work, commissioning the monitoring system, and providing a handover walkthrough. Supply-only suits commercial clients or owner-builders with a preferred electrician. We provide the hardware and technical documentation; your contractor completes the installation.
VPP and Victorian Programs
4 questions
What types of battery incentive programs exist in Victoria in 2026?
Victorian battery owners in 2026 may be eligible for federal STCs, Solar Victoria state rebates, and VPP export incentives, each with distinct eligibility requirements and program rounds.
Three main incentive categories apply as of 2026. The federal STC scheme provides a point-of-sale reduction on eligible systems installed by accredited installers - the value fluctuates and the scheme phases out annually until 2030. State programs via Solar Victoria have provided rebates to eligible residential owner-occupiers in funded rounds, opening and closing as allocation is made. VPP export incentives from some retailers provide ongoing credits for grid support participation.
Are Victorian solar battery rebates means-tested?
Some Victorian battery rebate programs apply income thresholds and household criteria, while others are available to a broader group, and the specific rules change between budget cycles.
Victorian state battery programs have historically operated across multiple eligibility tiers. Some programs apply an income threshold; others are available to any eligible residential owner-occupier without an income test. Whether means-testing applies depends on which round is open at the time of your application. In addition, most programs require an owner-occupied Victorian residence and no previous state rebate claimed at the same address.
Do VPP credits reduce my electricity bill?
VPP credits are paid to participating battery owners when stored energy is drawn from their battery by the network, but how that credit appears depends on your specific program and retailer.
When a VPP operator dispatches your battery, your stored energy is exported to the grid. In return, you receive a credit. The form that credit takes varies by program - some reduce your electricity bill directly, others pay to your bank account. The frequency and scale of dispatch events depends on grid and weather conditions in a given year.
How do I find out if my battery qualifies for current Victorian programs?
The fastest way to confirm eligibility for current Victorian battery programs is through the free quote process, where we check battery model, property type, and income criteria against current program requirements.
Eligibility for Victorian state programs depends on the specific battery model (which must appear on the current approved product list), the property type, the household income where a means test applies, and whether a previous rebate was claimed at the same address. STC eligibility requires a Clean Energy Council accredited installer. Submit a free quote request with your property details and we check current program requirements against your situation.
Still have a question?
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