Thinking about rooftop solar? This free calculator estimates the system size your household needs, how many panels that works out to, and roughly what you could save on your power bill each year. It uses Australian averages and typical system losses to give you a realistic starting figure before you seek quotes.
Estimate your solar system
Enter your details below for an instant estimate.
Estimates only. For an accurate quote, get quotes from Clean Energy Council accredited installers.
How to use this calculator
- Enter your average daily electricity usage in kWh — you’ll find it on your power bill.
- Adjust the peak sun hours and panel wattage if you know your local figures, or leave the Australian averages in place.
- Read your estimated system size, panel count and annual savings, then use them to compare quotes.
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Frequently asked questions
How many peak sun hours does Australia get?
Most Australian locations receive 4 to 5 peak sun hours per day on average, so the default of 4.2 suits a national estimate. If you know your local solar exposure figure, enter it above for a more tailored result.
What size solar system do I need?
It depends on how much electricity you use. As a guide, a household using 20 kWh per day needs roughly a 6 kW system — try the calculator above with your own usage.
Are these savings guaranteed?
No — the results are estimates for guidance only and don’t account for shading, roof orientation, tariffs or feed-in rates. For an accurate figure, get quotes from Clean Energy Council accredited installers.
Disclaimer: these results are estimates only. For an accurate quote tailored to your roof and usage, speak with Clean Energy Council accredited installers.