Updated on April 17, 2026
A solar battery saves extra energy from your solar panels, letting you power your home at night, keep the lights on during blackouts, or avoid buying expensive electricity during peak hours.
If your home has solar panels and you use a steady amount of power in the evenings, the right battery can help lower your energy bill to almost nothing.
So, what do solar batteries actually cost?
At PSC Energy, we install solar batteries every week and have helped customers with the federal battery rebate since it started in July 2025. Right now, we offer the Enphase IQ Battery 5P, Tesla Powerwall 3, and Sigenergy SigenStor.
In this guide, we’ll cover:
- What Is the Price of a Solar Battery in 2026?
- How Does Installation Type Affect Price?
- What About Battery Warranties and Lifespan?
- How Much Solar Battery Storage Do You Need?
- What Solar Battery Rebates Are Available?
- Which Battery Offers the Best Value?
- FAQ: Solar Battery Cost
By the end, you’ll know the costs of the three batteries we install, how they perform, and how to choose the best one for your home.
What Is the Price of a Solar Battery in 2026?
Here are our current prices for batteries only. These prices include installation, all necessary parts, and already have the federal rebate taken off:
- Enphase IQ Battery 5P (2 x 5 kWh = 10 kWh): around $14,000.
- Tesla Powerwall 3 (13.5 kWh): around $15,000.
- SigenStor (16 kWh, 2 x 8 kWh blocks): from around $14,000 for the battery and inverter blocks, with additional 8 kWh battery blocks at just under $3,000 each.
Please note, these prices are for battery-only installations (AC-coupled). If you want a full energy system from Sigenergy or Tesla, the price will be higher because it includes solar panels and extra equipment.
Prices differ between products because each battery uses different technology, has a unique installation process, and comes with its own warranty. Here’s how the three compare:
Enphase IQ Battery 5P
- Each unit has six microinverters that convert electricity directly.
- Individual microinverters can be replaced without pulling the whole unit.
- The battery continues to operate even if one microinverter fails.
- Decentralised design means a higher build cost, but you get extra backup and detailed monitoring.
Tesla Powerwall 3
- Built-in hybrid inverter, so fewer components to install.
- Best value when installed with new solar panels.
- If you’re adding it to a system with an existing inverter or microinverters, the installation is more complex and usually costs more.
Sigenergy SigenStor
- The most affordable option upfront.
- Modular 8 kWh blocks pair with a single inverter on top.
- Works well with three-phase power.
- Can be expanded as your energy needs grow.
Prices can also change based on your home’s setup. Here are some common factors:
- Can raise the cost: rewiring on older systems, switchboard upgrades, meter replacements.
- You can reduce the cost by combining the battery install with a new solar system, using streamlined hardware, or getting bigger combined rebates.
That’s why some customers choose to install everything at once, so they don’t have to pay extra installation costs later.
If you’d like to learn a bit more about what solar batteries are on the market, you might want to check out the following article titled, 6 Best Solar Batteries on the Market.
How Does Installation Type Affect Price?
There are two ways to install a battery: DC-coupled and AC-coupled. The choice affects efficiency, complexity, and cost.
DC-coupled
The battery is wired directly to the solar panels before the power reaches your home’s electrical system. Key benefits:
- Only one DC-to-AC conversion, so less energy is lost in the process.
- Smoother charging and faster response times.
- Tighter integration with the system as a whole.
- Greater solar panel oversizing potential, which can increase your federal solar rebate.
Enphase is an AC-coupled system (covered below). Our two DC-coupled complete energy systems include solar panels along with other components, which is why the price is higher. Starting costs when DC-coupled:
- Sigenergy SigenStor: from around $21,000
- Tesla Powerwall 3: from around $21,000
Installing solar panels, an inverter, and a battery together usually gives you better long-term value than adding them one at a time.
AC-coupled
The battery connects to the switchboard downstream from the inverter. How it works:
- Solar power is first converted from DC to AC for household use.
- Any leftover power is then converted from AC back to DC for battery storage.
- When that stored power is later needed, it is converted from DC back to AC again.
- Each extra conversion introduces a small energy loss.
AC-coupled systems are still effective and are easier to add to existing solar setups because you don’t have to change the original inverter.
The Tesla Powerwall 3 can be installed both ways: DC-coupled with new solar for better efficiency, or AC-coupled when added to an existing system, which is more complex and usually costs more. The same goes for SigenStor.
Choosing between AC and DC coupling depends on:
- Your home’s current system.
- How much do you plan to install at once.
- Whether maximum efficiency or ease of installation is the priority.
If you’re interested in learning about types of solar batteries, you might want to check out the following article titled, AC-coupled Battery vs. DC-coupled Solar Batteries.
What About Battery Warranties and Lifespan?
A solar battery is a long-term investment, so warranty terms and expected lifespan matter. What each brand offers:
- Enphase IQ Battery 5P: 15-year warranty or 6,000 cycles.
- Tesla Powerwall 3: 10-year warranty with unlimited cycles if connected to the internet.
- Sigenergy SigenStor: 10-year warranty or 32.85 MWh of throughput.
A “cycle” means a full charge and discharge of the battery. If your battery does this once a day, 6,000 cycles would last over 15 years. Most homes don’t use their batteries that much, so many batteries last longer than their warranty.
Reliability and single points of failure:
- Enphase has six microinverters inside each unit. If one fails, the other five keep the battery running, so the whole system doesn’t shut down.
- Tesla and SigenStor: a single central inverter. If it fails, the system stops working until it is repaired or replaced.
Both Tesla and Sigenergy are made with strong quality controls, but if long-term reliability matters to you, it’s worth considering the risk of a single point of failure.
Which battery suits each best:
- Enphase IQ Battery 5P — homeowners who want maximum redundancy and fewer service calls.
- Tesla Powerwall 3 — high-usage homes that benefit from unlimited cycles when connected online.
- Sigenergy SigenStor — homeowners who want simpler service and easy scaling over time.
Each battery has its own strengths. The best choice depends on your goals, your setup, and how long you want your system to run without interruptions.
If you’re interested in learning a bit more about the warranties for the products we install, you might want to check out the following article titled, A Complete Guide to Solar Warranties.
How Much Solar Battery Storage Do You Need?
The right battery size depends on how much electricity your home uses and when you use it. Picking the right size ensures you store enough solar energy during the day to power your home at night or on cloudy days. Some general guidelines for typical Australian homes:
- In small homes or energy-efficient households, 8 kWh can be enough. If you have LED lighting, energy-saving appliances, and low evening usage, a single SigenStor battery may suffice.
- Average family homes: 10 kWh to 13.5 kWh works well for most households with two to four people, a fridge, air conditioning, and regular evening power use. This setup often includes one Powerwall 3 or two Enphase batteries.
- Larger homes or homes with three-phase power: 16 kWh to 27 kWh or more may be needed for pool pumps, electric vehicle chargers, ducted air conditioning, or high daytime and nighttime usage. These homes often require stacked Powerwalls or SigenStor units.
All three battery systems we install can be expanded, but each does it differently. SigenStor lets you stack 8 kWh blocks, so you can start small and add more later. Enphase grows in 5 kWh steps, and Powerwall adds 13.5 kWh units.
We often recommend planning a few years ahead. If you might buy an electric car, add a granny flat, install a pool, or want to use less grid power, it can be smart to get a bigger battery now.
Batteries usually last over ten years, and most homes use more energy over time. Choosing the right size from the start helps you avoid paying for a rushed upgrade later.
When we help size a battery, we also look at your energy usage patterns. A larger battery makes more sense if you use most of your power after sunset. If you are home during the day (for example, retired or working from home) and use less at night, a smaller system will often suffice.
Getting the size right is one of the most important parts of designing your solar battery system. It affects your payback period, how much you save, how much backup you get during an outage, and how satisfied you are with the decision five years later.
If you’d like to learn more about the price of a Powerwall 3, you might want to check out the following article titled, How Much Does a Tesla Powerwall 3 Cost?
What Solar Battery Rebates Are Available?
In 2026, two main battery rebate programs are available to New South Wales homeowners. Between them, they can reduce the upfront cost of a battery and shorten the payback period.
Federal Cheaper Home Batteries Program
The federal battery rebate, also known as the Cheaper Home Batteries Program, launched on 1 July 2025. It works like the existing STC discount for solar panels, but applies to usable battery storage capacity rather than solar generation.
What the rebate is worth right now:
Until 30 April 2026, the rebate is calculated using an STC factor of 8.4, which currently works out to around $330 per usable kilowatt-hour after fees. On a 10 kWh battery, that is roughly $3,300 off the upfront cost. The exact figure is determined by the STC market price at the time of installation.
What changes on 1 May 2026
From 1 May 2026, two changes take effect:
- The STC factor drops from 8.4 to 6.8, and thereafter it is updated every six months rather than annually.
- A tiered structure replaces the flat per-kWh rebate:
- 0–14 kWh: full rebate per kWh
- 14–28 kWh: 60% of the rebate per kWh
- 28–50 kWh: 15% of the rebate per kWh
- Above 50 kWh: no rebate (though batteries up to 100 kWh can still participate in the program)
The government’s goal is to keep the overall discount at about 30% as battery prices drop, and to give more support to systems that are the right size for most homes instead of oversized ones.
The rebate applies to:
- New solar-and-battery installations.
- Batteries added to existing solar systems.
- Additional battery capacity added to a site that has not previously claimed the rebate (the added capacity must be at least 5 kWh, and total system size must not exceed 100 kWh).
Key rules:
- The battery must be on the Clean Energy Council’s approved product list and VPP-ready.
- Installation must be done by an accredited installer.
- The rebate can only be claimed once per eligible site.
- The program is scheduled to run until 2030, with the STC factor reducing every six months.
Installers typically apply the discount upfront and claim the STCs on your behalf.
NSW Virtual Power Plant (VPP) Incentive
The NSW Government’s upfront battery rebate (the Home Battery Installation Incentive) ended on 30 June 2025.
From 1 July 2025, it was replaced by an expanded Virtual Power Plant (VPP) incentive, which continues in 2026.
How it works:
- A one-off upfront payment of up to $1,500, based on battery size.
- Eligible battery sizes: 2 kWh to 28 kWh.
- Indicative payment: around $55 per usable kWh, paid once.
- Can be claimed alongside the federal Cheaper Home Batteries rebate.
Example figures often cited include around $550 for a 10 kWh battery and around $1,500 for a 27 kWh battery.
Note that VPP providers typically retain a portion of the gross entitlement to cover administration costs, so the net amount you receive may be lower than the headline figure.
What this means for your decision:
Combined, these programs can materially reduce the upfront cost of a battery. In 2026, the timing of your installation relative to 1 May will affect the size of the federal rebate you can claim, particularly for systems larger than 14 kWh.
If you’re interested in learning a bit more about the VPP portion of the battery rebate, you might want to check out the following article titled, NSW Battery VPP Rebate Explained: What You Need to Know.
Which Battery Offers the Best Value?
Now that we’ve covered price, performance, and rebates, here’s how each battery compares in real-world value.
The Enphase IQ Battery 5P is well-suited to homeowners who already have, or plan to install, an Enphase solar system.
Its main advantage is reliability: with six microinverters in each unit, the battery has no single point of failure.
The 15-year warranty and detailed monitoring app are designed to offer long-term visibility into the system’s performance. It sits at a premium price point and is built for longevity and system resilience.
The Tesla Powerwall 3 is at its best when installed as part of a new solar-and-battery system. Because it includes a hybrid inverter inside the unit, there are fewer components to install, and the design is more streamlined.
It offers better efficiency and faster payback when DC-coupled to solar panels, can back up your home during a blackout (in single-phase homes), and delivers up to 10 kW of continuous power, enough for a fridge, lights, internet, and several heavier appliances.
Three-phase homes have different requirements, and Powerwall has some backup limitations on those sites. It also scales up with additional units. For many households, particularly single-phase homes, it strikes a balance between performance and price.
The Sigenergy SigenStor is the newest of the three and offers the most flexibility, particularly for homes with three-phase power. Its modular stack design lets you add storage over time as your needs grow.
It is also the only option here that supports full three-phase backup out of the box, meaning it can power the whole home rather than a single circuit during an outage. It can suit homes with large appliances, EV chargers, or more demanding electrical setups.
Each battery we carry suits a different kind of homeowner: some want maximum control and safety, some want strong backup power at the best price, and some need a system that can grow over time. The right choice depends on your goals, your current system, and how much of your energy you want to manage yourself.
If you’d like to learn a bit more about the cost of SigenStor, we recommend you check out the following article titled, How Much Does the Sigenergy SigenStor Cost?
Wrapping Up: The Clock’s Ticking on the Full Charge
Solar batteries are a big upfront investment, but they can save you money over time, give you backup during outages, and let you control how your home uses power.
Since the federal rebate drops after 1 May 2026, when you install will affect how much you can claim, especially for bigger systems.
At PSC Energy, we can help you decide if a battery is right for your home, your needs, and your budget. It’s what we do.
If you’re interested in learning more about the Cheaper Home Batteries Program and it’s recent changes, you might want to check out the following article titled, Changes to the Australian Government’s Cheaper Home Batteries Program Explained.
FAQ: Solar Battery Prices and Rebates in 2026
How much is the federal battery rebate worth in 2026?
Until 30 April 2026, the federal Cheaper Home Batteries rebate is calculated using an STC factor of 8.4, which works out to around $330 per usable kilowatt-hour after fees. On a 10 kWh battery, that is roughly $3,300 off the upfront cost. From 1 May 2026, the STC factor drops to 6.8, and a tiered structure applies: the full rebate is paid on the first 14 kWh, 60% on 14–28 kWh, and 15% on 28–50 kWh. Anything above 50 kWh does not receive a rebate.
What size solar battery do I need for my home?
Most Australian households need between 10 kWh and 13.5 kWh of usable battery storage. Smaller or energy-efficient homes may be fine with around 8 kWh, while larger homes with pool pumps, ducted air conditioning, or EV chargers may need 16 kWh to 27 kWh or more. The right size depends on your nighttime energy use, your solar system output, and whether you want partial or whole-home backup during a blackout. Looking at your electricity bill or smart meter data is the best starting point.
How long do solar batteries last?
Most home batteries come with a 10 to 15-year warranty and are designed to last beyond that with normal use. The Enphase IQ Battery 5P carries a 15-year warranty or 6,000 cycles, the Tesla Powerwall 3 has a 10-year warranty with unlimited cycles when connected online, and the Sigenergy SigenStor has a 10-year warranty or 32.85 MWh of throughput. Daily cycling of 6,000 cycles equates to more than 16 years of use, so many homes can expect their battery to outlast the warranty period.
Can I claim the NSW VPP incentive with the federal battery rebate?
Yes. The NSW Virtual Power Plant incentive can be claimed alongside the federal Cheaper Home Batteries rebate. The VPP incentive is a one-off upfront payment of up to $1,500 for batteries between 2 kWh and 28 kWh, based on usable capacity. You need to enrol through an Accredited Certificate Provider, and a portion of the gross amount is usually retained by the VPP operator to cover administration costs.
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