The best battery system
is the one you will actually use
Battery rebates are still available and continue to
make these systems accessible.
In reality:• 80% of homes work well with ~15 kWh• ~15% may need up to 30 kWh• Only 5% need more
Oversizing leads to:• Higher cost without added value• Lower energy utilisation• Longer payback
Lower government support
Expensive battery installation later
Missed savings for this financial year
Lower government support
Expensive battery installation later
Missed savings for this financial year
If you are considering a solar battery for your home or business, timing is not just important. It directly impacts your return on investment.
We manage eligibility, rebate compliance, and installation from start to finish so you can proceed with clarity.
Most Homes Are Being Oversold on Battery Size
Incentives are still available today,
but are expected to reduce again from 1 January 2027.
The opportunity is not in installing more.It is in installing correctly, while incentives still support the investment.
Real Rebate Results
Max
An 11 kW solar PV system paired with a 16 kWh Sungrow battery delivers over $2,000 in annual savings, a 3 year payback, and an estimated 23% ROI.Engineered to maximise solar self consumption and reduce grid reliance, it transforms clean energy into measurable, long term financial performance.
David
Nicolaas
Paul
The home now runs entirely on solar, thanks to a 10 kWh Enphase battery that stores excess energy for cloudy days and peak demand. This smart setup reduces reliance on the grid, saves around $2,000/year and ensures uninterrupted power, all while maximising efficiency and long-term ROI.
Jessica
Premium Battery Systems
Built for Australian Conditions
We work with industry leading battery brands designed for Australian conditions, including:
Every system is designed around your energy usage, roof layout, and future expansion needs.
Home Battery Comparison
Features |  Tesla Powerwall 3 |  Sungrow SBR Series |  Sigenergy SigenStor |  Alpha ESS |
|---|---|---|---|---|
| Usable Capacity | 13.5 kWh | 9.6 – 25.6 kWh (Modular) | 5 – 48 kWh (Highly Modular) | 10 – 20+ kWh (Modular) |
| Continuous Power Output | High – Whole Home Capable | Strong – Hybrid Dependent | Very High – Stack Scalable | Moderate |
| Built-in Inverter | ✅ Yes (Integrated) | ❌ Requires Hybrid Inverter | ✅ 5-in-1 Integrated System | ❌ Requires Hybrid Inverter |
| Backup Capability | Whole Home (with correct design) | Partial / Whole Home | Whole Home + Fast EPS | Partial / Essential Loads |
| Expandable | Yes | Highly Modular | Highly Modular (Stackable) | Modular |
| EV Charger Integration | ❌ No | ❌ No | ✅ Optional Integrated EV Charger | ❌ No |
| App Monitoring | Tesla App | iSolarCloud | Sigen App (AI Optimised) | Alpha App |
| VPP Compatible | Yes | Yes | Yes | Yes |
| Warranty | 10 Years | 10 Years | 10 Years | 10 Years |
| Estimated Installed Price Before Rebate | ~$15,000 – $17,000 | ~$9,000 – $12,500 | ~$14,000 – $18,000 | ~$8,999 – $13,000 |
Final installed price depends on system size, inverter pairing, backup configuration, switchboard upgrades, and rebates.
We design your system based on real usage, not generic estimates.
30 Minute Call
No Obligation
Expert Advice
Book your free
battery assessment
Speak directly with an energy professional to confirm your
rebate eligibility and system design.
What you will get in this call
Confirmation of your rebate tier
Accurate savings projection based on your usage
Recommended battery size and configuration
Blackout protection assessment for your property
Clear pricing with finance options
Trusted Across Homes and Critical Infrastructure
A system is only as good as its design and installation
20+ years of combined experience
Award winning commercial projects
Polygon Energy
delivers reliable
battery systems
for homes,
small businesses
and critical operations
SAA accredited installers
Approved systems
meeting Australian standards
Experience across off grid
and critical infrastructure
Strong local support and after sales
Installation is just the start. Reliability is what matters
Why Batteries Still Make Sense
Even after May 2026, installing a battery continues to be a practical and financially sound decision.
Reduce reliance on
grid electricity
Protect against
rising energy costs
Store and use your
solar more effectively
Maintain essential
power during outages
FAQs
Is the battery rebate ending after May 1
No, the rebate is not ending after May 1. The program continues until 2030, so support for battery installations is still available.
What changes after May 1
The rebate continues, but reduces over time and is reviewed every six months.Expect around 5 percent to 10 percent lower incentives each year, which could mean AUD 1,000 to AUD 3,000 less for the same system if you install later.
How much discount can I get
Eligible systems can currently receive a discount of around 20 percent to 30 percent, depending on the battery size and installation timing.For example, a typical home battery system could see savings of approximately AUD 4,000 to AUD 8,000, depending on system size and location.
Why is the rebate decreasing
The rebate is designed to reduce over time as battery costs come down. This includes the gradual reduction in STC value, helping extend the program and support more households over the long term.
How does the new system work
- Higher value per kWh for the first portion of battery capacity
- Lower value for additional capacity beyond that
For most homes, a system in the range of 10 kWh to 15 kWh is typically sufficient and offers better value.
Will waiting reduce my savings
- STC values reduce every year
- Incentives are adjusted every six months
Do I need to apply for the rebate
No, there is no separate application required from your side. Your installer manages the STC process and the discount is typically included in your quote.
Who is eligible after May 1
The program remains available to homeowners and small businesses installing eligible solar and battery systems, subject to meeting the program requirements.To know more, connect with a Polygon Energy expert.
What is the smartest move right now
Installing sooner allows you to take advantage of higher STC values and better incentives.Right sizing your battery, typically around 10 kWh to 15 kWh for an average home, ensures you get maximum value without overspending.
Should I add a battery to my solar system?
Adding a battery to your solar system can significantly improve your energy independence and savings, especially if you:
- Use more electricity during the evening
- Want backup power during blackouts
- Want to reduce reliance on the grid
- Are on a time-of-use tariff or have low feed-in rates
- Plan to join a Virtual Power Plant (VPP)
With the launch of the Cheaper Home Battery Program (July 2025), eligible households can receive up to 30% off the battery installation cost, making solar batteries more affordable than ever.
Polygon Energy offers expert advice, system design, and installation of hybrid and retrofit battery solutions for homes and businesses.
What size battery do I need for my home or business?
The ideal solar battery size depends on your:
- Daily electricity usage
- Solar system size
- Backup needs during outages
- Time-of-use billing or VPP participation
- Budget and incentive eligibility
For homes, typical battery sizes range from 5 kWh to 13.5 kWh. Businesses may require 15 kWh to 100 kWh+, depending on load and peak usage.
Polygon Energy conducts detailed energy audits and usage modelling to recommend the right battery capacity tailored to your energy profile and return on investment goals.
How much can I save with solar battery storage?
Battery savings depend on how much stored energy offsets your evening grid usage and whether you’re part of a time-of-use tariff or VPP. Key benefits include:
- Avoiding peak electricity rates
- Maximising solar self-consumption
- Reducing power bills by up to 60–90%
- Earning credits via VPP programs
- Improving blackout protection
Combined with the federal battery rebate and solar feed-in tariffs, many households and businesses achieve battery payback in 6–10 years depending on usage and setup.
Polygon Energy provides a detailed battery return-on-investment (ROI) report with every quote.
Can batteries work without solar panels?
Yes, batteries can work without solar panels, especially when:
- Used to shift grid energy for time-of-use savings
- Paired with off-peak or EV charging strategies
- Installed in homes expecting future solar upgrades
- Supporting critical loads during outages
However, batteries are most cost-effective when charged with free solar energy. Polygon Energy offers battery-only solutions and scalable setups that allow future solar integration.
What is a Virtual Power Plant (VPP) and how can I participate?
Yes, batteries can work without solar panels, especially when:
- Used to shift grid energy for time-of-use savings
- Paired with off-peak or EV charging strategies
- Installed in homes expecting future solar upgrades
- Supporting critical loads during outages
However, batteries are most cost-effective when charged with free solar energy. Polygon Energy offers battery-only solutions and scalable setups that allow future solar integration.
What happens during a blackout if I have a battery?
If your system includes a solar battery with backup capability, it can power critical loads during a blackout, including:
- Lights
- Fridge/freezer
- Internet/Wi-Fi
- Medical devices
- Security systems
Most hybrid inverters are programmed to isolate your home from the grid during an outage, keeping your battery and solar system operating safely.
Polygon Energy designs blackout-ready solar and battery systems with custom backup circuits to suit your home or business needs.
What battery technologies are available in Australia?
The most common battery technologies used in solar energy storage in Australia include:
- Lithium-ion (LiFePO4 / NMC) – Most popular for residential and commercial systems; high efficiency and long life.
- Brands: Tesla Powerwall, Sungrow, Redback, AlphaESS, BYD, Pylontech
- Flow batteries – Longer lifespan, lower degradation, ideal for large-scale or remote use
- Lead-acid (AGM/Gel) – Low-cost, but less efficient and used mainly in legacy off-grid systems
Polygon Energy supplies Tier 1 battery systems with long warranties, app-based monitoring, and integration with VPPs and smart load control.
How much money will I actually save?
The program aims to provide a discount of around 30% on the upfront cost of a battery. The exact amount depends on the battery’s usable capacity (kWh) and the “STC factor” at the time of installation.
Does the discount change under the Cheaper Home Battery Rebate Program?
Yes. Under the Cheaper Home Battery Rebate Program, the rebate is designed to decrease every six months until 2030 as battery prices continue to fall.
Am I eligible if I already have solar panels?
Yes. The discount is available for batteries connected to both new and existing solar PV systems.
What size battery should I get to maximize the rebate under the Cheaper Home Battery Rebate Program?
- 0–14 kWh: 100% of the STC factor (highest rebate per kWh)
- 14–28 kWh: 60% of the STC factor
- 28–50 kWh: 15% of the STC factor
How do I know if an installer is legitimate?
To get the rebate, your installer must be accredited by Solar Accreditation Australia (SAA) and the battery product must be accredited by the Clean Energy Council (CEC).