Solar & Battery Calculators
Free tools to help you understand costs, savings, and find the right system for your home.
Last updated 4 January 2026
Choose the right calculator for your question
Solar Savings Calculator
Calculate how much you could save with solar based on your electricity usage, location, and system size.Savings estimate / Payback period / System recommendationsBattery Size Calculator
Find the right battery size for your home based on usage patterns, solar system size, and backup needs.Size recommendations / Cost estimates / Backup durationPayback Calculator
Calculate how long it will take for your solar system to pay for itself and see your 25-year ROI.Payback period / 25-year projection / ROI analysisRebate Calculator
See exactly how much you can claim in federal and state rebates for solar and batteries.STC value / State rebates / Total savingsSolar Panel Calculator
Find out how many solar panels your home needs based on your electricity bill and location.Panel count / System size / Roof space neededRebate Quiz
Answer a few questions to see your personalised rebate estimate, then get one Why Solar Approved installer and fifteen minutes with a solar expert before you sign.Personalised estimate / One approved installer / 60 seconds
How our calculators help
Enter your details
Provide basic information about your location, electricity usage, and preferences.
Get instant results
Our calculators use real Australian data to give you an estimate in seconds.
Make informed decisions
Use your results to check the quote you are given and choose the right system for your home.
Related guides
Frequently asked questions
Which solar calculator should I use?
Start with the Solar Savings Calculator to estimate your potential savings based on your location and usage. Then use the Rebate Calculator to see your government incentives, and the Payback Calculator for ROI analysis.
How accurate are solar calculators?
Our calculators use real Australian data including local sun hours, electricity rates, and current rebate values. Results are estimates: actual savings depend on your specific roof, shading, and usage patterns. Get a professional quote for precise figures.
Do I need a battery calculator?
If your feed-in tariff is below 5c/kWh or you use most electricity in the evening, a battery could be worthwhile. Use our Battery Size Calculator to find the right capacity and see if the economics stack up for your situation.
See the rebate on your own roof
The rebate quiz takes 60 seconds. One Why Solar Approved installer, one free written quote, and fifteen minutes with a solar expert before you sign.