Welcome to the guide
Everything you need to buy a solar battery in 2026, with confidence.
Whether you've already gone solar or you're just starting to look into energy storage, this guide walks you through how solar batteries work, what they cost, which rebates you can access, and how to choose the right setup for your home.
No sales pitch, no jargon — just what you need to make a confident decision that could save you thousands over the life of your system.
What you'll walk away knowing
- How a battery actually fits into your existing solar system
- How to size a battery for your household
- Exactly how the 2026 federal rebate works — and why timing matters
- Realistic installed costs, after rebate
How solar works without a battery
Before we get to batteries, it helps to understand the system you likely already have.
Solar panels turn your roof into a small power plant. Photovoltaic cells capture sunlight and convert it into direct current (DC) electricity — whenever there's daylight, sunny or overcast.
Your home runs on alternating current (AC), so an inverter converts the DC power your panels produce into something your appliances can use.
Sunlight hits the panels
Photovoltaic cells generate DC electricity.
The inverter converts it
DC becomes usable AC power.
Your home uses it live
Appliances draw power as it's produced.
Excess goes to the grid
You're paid a feed-in tariff for what you export.
When the sun goes down or production dips, your home switches back to grid power automatically — charged at standard retail rates.
So without a battery, solar still delivers excellent daytime savings, but you're exporting cheap and buying back expensive. That gap between what you're paid to export and what you pay to import is exactly where a battery earns its keep — by storing your own excess power for use after dark, instead of sending it away for a small credit.
What a solar battery does — and why add one
The missing piece of the energy puzzle.
A solar battery stores the excess electricity your panels generate during the day, so you can use it later — at night, on cloudy days, or during a blackout.
Without one, any unused solar energy simply goes back to the grid for a small credit. With a battery, you keep more of what you generate and use it whenever power is expensive or unavailable. That's real energy independence.
Why homeowners add a battery
- Lowers power bills by storing solar instead of buying grid power at night
- Provides backup during blackouts, with the right setup
- Maximises your existing solar investment by reducing waste
- Reduces reliance on the grid
- Supports a cleaner energy future
Understanding capacity & power
Three specs decide how a battery will actually behave in your home.
Total capacity
The maximum amount of energy the battery can store — for example, 10kWh.
Usable capacity
The portion you can actually access safely — usually 85–100% of total capacity.
Power output
How fast the battery can deliver energy — critical for running appliances and backup circuits.
How solar works once a battery is installed
Your panels, battery and the grid work together depending on conditions:
Sun down, no solar
Your home draws from the grid — and from the battery if it has charge stored.
Some solar, not quite enough
You draw from solar and battery together, then top up with a little grid power.
Full sun, battery full
Once your battery is topped up, the extra is sold back to the grid.
Backup power & blackouts
Power outages are more than an inconvenience — they can be costly and disruptive.
Full home backup
Your entire home keeps running during an outage, drawing power from your battery. It needs more advanced electrical design and a higher-capacity inverter, but offers complete peace of mind.
Partial home backup
The more common option. It powers essential circuits only — fridge, WiFi, lighting and a few chosen appliances. A great balance of cost and reliability.
It's also worth understanding your home's power phase:
- Single-phase power — typical for most residential homes. Can support full or partial backup, depending on the battery system.
- Three-phase power — more common in rural, commercial or high-demand homes. Special equipment may be needed for full-home backup across all phases.
Things to note
- Not all battery systems come with backup as standard — it must be requested at design stage
- Backup is limited by battery and inverter capacity — you can't power every appliance at once
- Blackout protection often requires a dedicated backup switchboard
- Some batteries can "black start" and recharge from the sun during an outage; others only discharge once until grid power returns
Choosing the right size
You only get one rebate per property, so getting the capacity right up front matters.
1. Your daily usage
We analyse how much energy you use — especially after sunset — to avoid sizing too small or too large.
2. When you use power
Home during the day, or higher evening use? Batteries shine when matched to your household's rhythm.
3. Appliance loads
Air-con, heating, pool pumps, EV chargers — we size the power output to support what you actually run.
4. Your budget
Bigger batteries cost more upfront but unlock a larger rebate — we'll walk through the payback period.
5. Future-proofing
Planning an EV or more panels? We can design your system to grow with you — you can't claim the rebate twice.
6. Your existing solar
We assess your current system's output to work out if extra panels are needed to keep the battery charged.
The Cheaper Home Batteries rebate
A national incentive that makes energy storage genuinely more affordable.
Homeowners and small businesses across Australia now have a national incentive to make energy storage more affordable — big news if you've been sitting on the fence about whether a battery is worth it.
The rebate amount depends on when you install and how big your battery is — larger batteries earn a higher rebate value. It's delivered via Small-scale Technology Certificates (STCs), the same mechanism that's long supported the solar panel rebate: STCs represent units of renewable energy, which the government purchases from eligible battery systems to bring down the upfront cost.
| Battery size (kWh) | Now – 31 Dec 2026 | 1 Jan – 30 Jun 2027 |
|---|---|---|
| 10 | $2,584 | $2,166 |
| 15 | $3,773 | $3,162 |
| 20 | $4,548 | $3,812 |
| 25 | $5,323 | $4,462 |
| 30 | $5,866 | $4,917 |
| 35 | $6,059 | $5,079 |
| 40 | $6,253 | $5,242 |
| 45 | $6,447 | $5,404 |
| 50 | $6,641 | $5,567 |
Why timing matters
The rebate steps down twice a year until it phases out completely by the end of 2030.
We've already seen two reductions since the scheme began in 2025. Here's what that looks like in practice:
Real-world example
Install a 40kWh battery before 31 December 2026 and the rebate is worth roughly $6,253. Wait until 1 January 2027 and it drops to about $5,242 — a difference of around $1,012. Pair it with a 13.2kW solar array and you'll miss a further ~$720 in panel rebate value — a combined difference of roughly $1,732.
This step-down continues twice a year unless government funding is increased — and there's no guarantee the rebate won't end earlier if funding runs out. We recommend proceeding as soon as you're comfortable with a system design that suits your needs.
Who's eligible
- No income test
- No postcode restriction
- No cap on installations nationwide
- Must be paired with a solar system (existing or new)
- Must be VPP-ready if connected to the grid — off-grid batteries are exempt
- One claim per property, so size for the long term
Virtual power plants (VPPs)
Thousands of home batteries, acting as one.
A Virtual Power Plant is a network of connected home batteries that work together to support the electricity grid. Instead of relying solely on large power stations, a VPP lets thousands of homes with battery storage act like one big power source during peak demand.
Join a VPP and you agree to share a small portion of your battery's stored energy with the grid when needed — typically during high-demand or grid-stress events. In return, you may receive bill credits, cash payments, or a discount on your battery purchase.
Every VPP operates a little differently: some offer upfront incentives, others reward you over time based on how much energy your battery contributes. We'll help you compare programs and choose the one that suits your usage and rebate eligibility.
Joining a VPP helps
- Stabilise the electricity grid
- Reduce reliance on fossil fuel generation
- Improve the return on your solar and battery investment
- Qualify you for rebates that require VPP-ready systems
Safety & installation
Installed properly, solar batteries are very safe.
We only use
- Solar and battery accredited installers
- Reputable, good-quality brands
- Proper safety gear and protocols
Every installation includes
- Ventilation, and no obstructions or storage near the battery
- Weather protection for outdoor installs
- Monitoring software or an app for performance tracking
- Strict adherence to electrical safety standards
How long do batteries last?
Most batteries last 10–15 years with proper maintenance.
Factors that affect lifespan
- Battery chemistry
- Daily usage cycles
- Weather exposure
- Overall system design
Warranties typically cover 10 years, or a defined energy-output threshold, whichever comes first. We only recommend batteries backed by solid local support and long-term performance data — so the warranty actually means something when you need it.
What does a battery cost?
Indicative installed pricing, before and after the federal rebate.
| Battery size | Typical cost (installed) | Est. federal rebate | Net cost after rebate |
|---|---|---|---|
| 15 kWh | $6,000–$7,000 | $1,600–$1,850 | $4,150–$5,400 |
| 25 kWh | $23,750 | $7,750 | $16,000 |
| 35 kWh | $30,850 | $10,850 | $20,000 |
| 50 kWh | $43,500 | $15,500 | $28,000 |
Additional costs may include switchboard upgrades, VPP setup, or a dedicated backup board. State-based rebates may also apply on top of the federal scheme, depending on where you live.
Is a battery worth it?
A battery is likely worth it if you want any of the following.
- Lower electricity bills
- Energy independence
- Blackout protection
- Better solar self-consumption
- A smaller carbon footprint
- Eligibility for VPP or government rebates
We'll help you weigh the numbers and see whether a battery makes sense for your home.
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