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Estimate your solar ROI in 3 simple steps.
DISCLAIMER: This calculator provides an estimate based on average solar production data. Actual savings will vary based on your specific roof, location and usage.
How This Solar Calculator Works
Our free solar savings calculator estimates your potential return on investment based on three key factors: your quarterly electricity bill, your roof's exposure to shade, and whether someone is home during the day to use the solar power generated.
The calculation uses average solar irradiance data for Australian climate zones, current STC rebate values, and typical feed-in tariff rates to give you a realistic savings estimate. Systems are modelled on a standard 6.6kW setup with a 5kW inverter — the most popular size for Australian homes in 2026.
What Affects Your Solar ROI in Australia?
- Your location — sunnier states like QLD and SA generate more power annually.
- Roof orientation — north-facing roofs produce the most energy in Australia.
- Daytime usage — self-consuming solar power saves ~3–5× more than exporting it.
- Export limits — your DNSP may cap how much you can export to the grid.
- STC rebate value — reduces each year until the scheme ends in 2030.
Get a free, confirmed quote → from a CEC-accredited installer in your area to verify your exact figures.