With energy prices rising and battery costs falling, Australians in 2025 are looking for smarter ways to control their electricity bills. Before investing in a new solar or battery system, it’s important to know exactly what size you need — and how much you’ll save.
The SunSPoT Solar and Battery Calculator is a free, government-supported tool that helps you plan your system with real data. It provides detailed insights into potential savings, energy generation, and system performance — tailored to your home’s location.
This article will walk you through how to use the calculator effectively and how to combine it with trusted insights from Solar Proof.
What Is the SunSPoT Solar and Battery Calculator?
The SunSPoT Solar and Battery Calculator is part of the Australian Government’s Energy.gov.au initiative. It allows homeowners to estimate how much solar power and battery storage they need to reduce grid dependence and save on bills.
It uses detailed satellite and solar radiation data to assess:
- How much solar your roof can generate
- The ideal system size for your home
- Estimated energy consumption and export rates
- Annual cost savings and payback time
Unlike simple calculators, SunSPoT also includes battery storage modelling, helping you see how a battery can increase your solar self-consumption and energy independence.
Why Every Homeowner Should Use It
This tool is particularly useful if you’re new to solar or considering adding a battery to your existing system. It helps you make informed decisions before you contact installers.
With the SunSPoT calculator, you can:
- Understand your solar potential based on roof area and sunlight exposure
- Compare solar-only versus solar + battery setups
- Estimate energy savings and payback period
- Plan ahead for electric vehicle charging integration
Because it’s run by Energy.gov.au, the results are reliable, unbiased, and designed for real-world Australian conditions.
How to Use the SunSPoT Solar and Battery Calculator
Follow these easy steps to get your results in minutes:
Step 1: Visit the Calculator
Go to https://www.energy.gov.au/rebates/sunspot-solar-and-battery-calculator.
Step 2: Enter Your Address
The tool uses satellite mapping to assess your rooftop exposure to sunlight.
Step 3: Input Energy Data
Enter your electricity usage and bill amount. This allows the calculator to model energy generation and consumption accurately.
Step 4: Adjust System Size
You can select or change the number of panels and battery capacity to see how performance and savings vary.
Step 5: Review the Results
The calculator will show:
- Annual savings in dollars and kWh
- CO₂ emission reductions
- Battery storage benefits
- Estimated payback period
Tip: Try multiple scenarios — such as 6.6 kW solar alone, and then 6.6 kW + 10 kWh battery — to see how each option affects savings.
Combining Solar and Batteries for Maximum Savings
Adding a battery allows you to store excess solar energy during the day and use it at night. This can cut your electricity bill by up to 70 – 80 %, depending on your usage patterns.
To understand the real-world benefits of home batteries in Australia, read our detailed breakdown here:
Cheaper Home Batteries in 2025: How Australia Is Powering the Future
That article explains current battery prices, rebate programs, and how federal initiatives are making storage more affordable.
Example: Typical Home Using SunSPoT
Let’s say a homeowner in Melbourne uses the calculator to analyse a 6.6 kW solar system with a 10 kWh battery.
- Annual generation: ~9,000 kWh
- Annual savings: around $1,700
- Payback period: approximately 5 – 6 years
By adjusting system size, they can find the sweet spot that balances upfront cost and long-term return — all before requesting quotes.
Why You Should Still Get Professional Quotes
While the SunSPoT calculator provides excellent guidance, it doesn’t replace expert system design. Real installers will consider roof pitch, inverter options, and available rebates.
Get your free, no-obligation quotes here: https://quotes.solarproof.com.au/request-solar-quotes/
With Solar Proof, you can:
- Compare multiple CEC-accredited installers
- Review pricing, warranties, and brands
- Match your SunSPoT results with actual installer proposals
By combining the government calculator with Solar Proof’s verified quotes, you’ll gain a complete picture — from energy performance to final costs.
Australia’s Solar Future Is Data-Driven
Free tools like SunSPoT empower homeowners to make smart energy decisions. With battery prices continuing to fall and solar technology improving, 2025 is the perfect time to take advantage of these resources.
Start with accurate planning using Energy.gov.au’s calculator, then compare quotes with Solar Proof to build a system that delivers maximum value and long-term savings.