The cost of a home battery in Australia depends on the capacity you choose, the brand, whether your existing solar system needs an inverter upgrade, and the complexity of the installation. The federal Cheaper Home Batteries Program currently provides around a 30% discount on eligible systems, which significantly reduces the out-of-pocket cost.
This guide explains what determines battery pricing, what is included in the installed cost, how the rebate works in practice, and how to evaluate whether a battery quote represents good value. SunRight Solar does not publish fixed battery prices because every installation is different. Instead, we explain the factors that drive cost so you understand what you are paying for.
Five main factors determine how much your battery installation will cost.
01
Battery Capacity
Capacity is measured in kilowatt-hours (kWh) and represents how much energy the battery can store. Larger batteries cost more, but the cost does not scale linearly. A 20kWh battery does not cost twice as much as a 10kWh battery because a significant portion of the cost is in the installation, inverter, and electrical work, which is similar regardless of capacity.
This means larger batteries generally offer a lower cost per kWh of storage, which is one reason many homeowners choose to install more capacity than their minimum requirement.
02
Battery Brand and Chemistry
All major residential batteries sold in Australia in 2026 use lithium iron phosphate (LFP) chemistry, which has become the standard due to its safety, longevity, and cost characteristics. However, prices vary significantly between brands due to differences in manufacturing quality, warranty terms, cycle life, monitoring platforms, and the manufacturer's Australian support infrastructure.
A premium brand with 8,000 or 10,000 cycle warranty, high round-trip efficiency, and local warranty support will cost more than an entry-level brand with 6,000 cycles and limited local representation. The price difference reflects real differences in expected lifespan and support quality.
This is the cost factor that surprises many homeowners. If your solar system currently has a standard string inverter (not a hybrid), adding a battery requires one of two paths:
Option 1
Replace the string inverter with a hybrid inverter. This adds the cost of the hybrid inverter and the labour to swap it. The advantage is a clean, integrated system going forward.
Option 2
Add an AC-coupled battery with its own inverter. Some battery systems (like the Tesla Powerwall 3) include a built-in inverter and can be added alongside your existing string inverter. This avoids replacing the existing inverter but adds the cost of the battery's integrated inverter.
If your solar system already has a hybrid inverter, adding a battery is simpler and cheaper because the inverter is already battery-compatible.
This is why SunRight Solar recommends discussing battery plans during the initial solar system design. Installing a hybrid inverter from the start costs marginally more than a string inverter but saves significantly on the battery retrofit later.
A standard battery installation in a home with an existing hybrid inverter and accessible switchboard is the simplest and least expensive scenario. Costs increase if the switchboard needs upgrading, if the battery location requires additional cable runs, if backup wiring is required (broader backup coverage involves more switchboard work), or if the installation requires specialist access equipment.
05
Your Location
Installation costs vary between capital cities and regional areas due to labour rates and travel distances. The federal battery rebate value also varies slightly based on the STC zone, although the variation is less significant for batteries than for solar panels.
What Is Included in a Battery Installation Price?
A battery installation quote should include all of the following:
Hardware
the battery unit or modules (brand, model, and usable capacity should be specified), any required battery inverter or hybrid inverter (if not already installed), DC isolators, AC isolators, and all cabling.
Electrical work
connection to your switchboard, backup wiring if applicable (specifying which circuits are backed up), any required switchboard modifications, and system commissioning.
Administration
STC creation and processing (the federal rebate), connection notification to your electricity distributor if required, and any VPP registration if applicable.
After-installation
monitoring setup, a walkthrough of how the system operates, and the installer's workmanship guarantee.
If a quote does not specify the battery brand and model, does not clarify whether the rebate is included in the price, or does not state whether an inverter is included, ask for clarification before comparing it to other quotes.
How the Federal Battery Rebate Affects Your Price
The Cheaper Home Batteries Program provides around a 30% discount on eligible home battery systems. The discount is applied at the point of sale, meaning your installer creates the STCs, sells them, and deducts the value from your quote. You do not need to apply separately.
Is the rebate already in the quoted price? In most cases, yes. The majority of battery installers include the rebate in their quoted price. If a quote shows a "before rebate" and "after rebate" figure, the "after rebate" price is what you will pay. Always confirm this with your installer.
How much is the rebate worth? The exact rebate amount depends on the battery's usable capacity and the current STC price, which fluctuates with market conditions. The rebate is larger for bigger batteries because more STCs are generated for more capacity.
Eligibility requirements. The battery must have usable capacity between 5kWh and 100kWh, be connected to new or existing rooftop solar, use a CEC-approved product, be installed by an SAA accredited installer with GCBS certification, and have VPP capability if connected to the grid. The programme is not means-tested.
State-based incentives may further reduce your out-of-pocket cost. In NSW, the Home Energy Saver Program offers eligible households zero-interest loans of up to $15,000 for energy upgrades including batteries.
When comparing battery quotes at different capacities, cost per kilowatt-hour ($/kWh) is a useful metric. Divide the total installed cost (after rebate) by the usable capacity to calculate the cost per kWh of storage.
This metric helps you evaluate value across different sizes and brands. A 14kWh battery that costs less per kWh than a 10kWh battery offers better value per unit of storage, even though the total price is higher.
Cost per kWh typically decreases as capacity increases because installation and inverter costs are spread across more storage. Modular battery systems (where you add individual modules) tend to have a slightly higher cost per kWh at smaller sizes but offer the flexibility to expand later.
Battery Pricing by Capacity
Battery costs vary based on brand, inverter requirements, and installation complexity. The following capacity tiers represent the most common residential battery sizes in Australia.
The six residential capacity tiers, and what this guide says about cost at each. No prices are published: SunRight Solar quotes every installation individually.
Capacity
What it suits
What it means for cost
5kWh
A 5kWh battery is the entry-level option, suitable for households with low overnight electricity consumption or those wanting to test battery ownership before committing to a larger system.
At this capacity, the installation and inverter costs represent a larger proportion of the total price, which means the cost per kWh is higher than larger systems.
10kWh
It suits households with a 6.6kW solar system and moderate overnight consumption.
At this capacity, the balance between upfront cost and storage value begins to improve.
14kWh
It provides enough storage to cover most evening and overnight usage for a typical four-person household with a 6.6kW or 10kW solar system.
The federal rebate at this capacity is meaningful, and the cost per kWh improves compared to smaller sizes.
20kWh
A 20kWh battery is suited to higher-consumption households, all-electric homes (no gas), or homes with an electric vehicle.
At this capacity, the battery can store a full day's worth of evening and overnight electricity for many households, and the cost per kWh of storage is more favourable.
28kWh
The 28kWh tier is for households approaching near self-sufficiency.
The system cost is higher, but the electricity offset is substantial.
42kWh
It suits large all-electric homes, properties seeking near-complete grid independence, or households with very high consumption including EV charging.
At this capacity, the cost per kWh of storage is at its most favourable, but the total investment is significant.
Scroll the table sideways to read all three columns.
5kWh Batteries
A 5kWh battery is the entry-level option, suitable for households with low overnight electricity consumption or those wanting to test battery ownership before committing to a larger system. At this capacity, the installation and inverter costs represent a larger proportion of the total price, which means the cost per kWh is higher than larger systems. The federal rebate applies from 5kWh upward.
The 10kWh capacity is one of the most popular residential sizes in Australia. It suits households with a 6.6kW solar system and moderate overnight consumption. At this capacity, the balance between upfront cost and storage value begins to improve.
The 14kWh tier sits in the "sweet spot" for many Australian households. It provides enough storage to cover most evening and overnight usage for a typical four-person household with a 6.6kW or 10kW solar system. The federal rebate at this capacity is meaningful, and the cost per kWh improves compared to smaller sizes.
A 20kWh battery is suited to higher-consumption households, all-electric homes (no gas), or homes with an electric vehicle. At this capacity, the battery can store a full day's worth of evening and overnight electricity for many households, and the cost per kWh of storage is more favourable.
The 28kWh tier is for households approaching near self-sufficiency. Combined with a 10kW or 13kW solar system, this capacity can cover most daily usage including winter evenings. The system cost is higher, but the electricity offset is substantial.
A 42kWh battery represents maximum residential storage. It suits large all-electric homes, properties seeking near-complete grid independence, or households with very high consumption including EV charging. At this capacity, the cost per kWh of storage is at its most favourable, but the total investment is significant.
Modular battery systems (such as those from Sungrow, FoxESS, Growatt, BYD, and Alpha ESS) allow you to install a smaller battery now and add capacity modules later. This approach has advantages and trade-offs.
Advantages of starting small
Lower upfront cost, the ability to assess your actual usage patterns before committing to full capacity, and the option to take advantage of falling battery prices when you expand.
Trade-offs
Adding modules later typically costs more per kWh than buying all the capacity at once, because you may pay for a second installation visit and additional electrical work. The federal rebate amount per kWh may also be lower in future years as the STC factor is periodically reduced.
The inverter consideration
If you plan to expand, ensure your hybrid inverter can support the maximum capacity you might want. Installing an inverter rated for 10kWh of battery and then wanting 20kWh will require an inverter replacement.
For most homeowners who know they want battery storage, installing the capacity you need now (or close to it) provides better value per kWh. Modular expansion is best suited to homeowners with budget constraints who want to start generating savings immediately while retaining the option to grow.
Battery Payback: What to Expect
Battery payback is more complex than solar panel payback because the savings depend on several variables that differ between households.
0510152025
Typical payback: seven to twelve yearsSavings continue beyond the breakeven point
Years from installation. The band marks the payback period the guide describes as typical; the scale runs to 25 years, the upper end of the 15 to 25-year asset life the guide states. No dollar values are plotted, because this guide publishes none.
How battery savings work
A battery saves you money by storing excess solar during the day and using it in the evening and overnight, avoiding grid electricity purchases at 30 to 45 cents per kWh. Every kWh you use from the battery instead of buying from the grid saves you the difference between your grid tariff and what you would have earned as a feed-in tariff (typically 3 to 10 cents).
The savings per cycle
If your grid tariff is 35 cents and your feed-in tariff is 5 cents, every kWh stored and used from the battery saves you 30 cents.
A 10kWh battery cycled once per day saves approximately $3 per day, or roughly $1,100 per year, before accounting for efficiency losses.
Typical payback periods
Battery payback periods in Australia typically range from seven to twelve years, depending on the battery cost (after rebate), the size of the tariff gap between grid purchase price and feed-in tariff, the daily cycling depth, and whether the household maximises self-consumption.
What improves battery payback
Higher grid electricity tariffs, low feed-in tariffs (which make exporting solar less valuable and storing it more valuable), high evening electricity usage, and VPP participation (which can generate additional revenue from exported battery energy during peak demand events).
Why battery payback is longer than solar payback
Solar panels generate free electricity from sunlight. The savings are immediate and significant. Batteries redistribute electricity that was already generated by your solar panels. The savings come from the tariff differential (grid price minus feed-in tariff), which is smaller than the full grid tariff that solar offsets. This is not a reason to avoid batteries. It means the financial case depends more on your specific tariffs and usage patterns.
Battery storage is a 15 to 25-year asset. Even with a seven to twelve-year payback, the battery delivers savings and energy independence for many years beyond the breakeven point.
How to Compare Battery Quotes
When evaluating battery quotes, check these points:
Battery brand, model, and usable capacity.
Not nominal capacity. Usable capacity is what you can actually draw from the battery.
Is the federal rebate included?
Confirm whether the quoted price is before or after the battery rebate. Most installers include it, but always verify.
Is an inverter included?
If your home currently has a string inverter, the battery quote should include either a hybrid inverter replacement or an AC-coupled battery inverter. If the quote only includes the battery hardware, the inverter cost is missing.
Backup capability.
If backup is important to you, confirm whether the quote includes backup wiring and which circuits will be protected. Backup adds cost, and not all quotes include it.
Cycle life warranty.
Compare the warranted cycle count and the minimum capacity retention at end of warranty. A battery warranted for 6,000 cycles to 60% retained capacity is a weaker warranty than one warranted for 8,000 cycles to 80%.
Installer accreditation.
For the federal battery rebate to apply, the installer must hold SAA accreditation with GCBS (Grid Connected Battery Systems) certification. Verify this before signing.
Total cost per kWh.
Calculate the installed cost (after rebate) divided by usable capacity. This allows you to compare value across different sizes and brands.
The cost of a 10kWh battery depends on the brand, whether a hybrid inverter is included, and the installation requirements for your home. The federal battery rebate (approximately 30%) is applied at the point of sale and reduces the out-of-pocket cost. For an accurate price based on your specific situation, request a personalised quote.
Is the battery rebate already included in the price?
In most cases, yes. The federal Cheaper Home Batteries Program discount is applied by your installer at the point of sale. If a quote shows a "before rebate" and "after rebate" figure, the lower figure is your out-of-pocket cost. Always confirm with your installer.
If your solar system has a standard string inverter, you will need either a hybrid inverter replacement or an AC-coupled battery system with its own inverter. Both add cost. If your system already has a hybrid inverter, adding a battery is simpler and less expensive.
Not necessarily better in every case, but larger batteries typically offer a lower cost per kWh of storage because installation and inverter costs are spread across more capacity. However, a battery significantly larger than your actual usage pattern will take longer to pay back because you may not cycle it fully each day.
Can I add more battery capacity later?
Yes, if you choose a modular battery system. Brands like Sungrow, FoxESS, Growatt, and BYD offer stackable modules that can be added to an existing installation. Your hybrid inverter must support the expanded capacity. Adding capacity later typically costs slightly more per kWh than buying all the capacity at once.
How long does a battery take to pay for itself?
Battery payback periods in Australia typically range from seven to twelve years, depending on your electricity tariffs, self-consumption patterns, battery cost (after rebate), and whether you participate in a VPP. After the payback period, the battery continues to deliver savings for the remainder of its warranted life (10 to 15 years) and potentially beyond.
Get a Battery Price for Your Home
Every home has different energy usage, a different solar system, and different inverter requirements. The most accurate way to understand what a battery will cost for your property is to request a personalised quote.
