Solar savings calculator

Last updated: 2026-07-28

Estimate what solar could save your Australian home. Choose your state and monthly power bill for an instant, indicative estimate — then get your exact numbers from a vetted local installer.

Estimated yearly saving
Suggested system
Indicative payback
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Indicative only — based on Australia regional solar output and average power prices. Your actual result depends on your roof, usage and system, confirmed at your free on-site assessment.

What affects your solar savings

  • Your power bill — the higher your bill, the more you can save. Homes over $200/month see the strongest returns.
  • Your state — sunnier areas generate more power per panel, so savings vary by location.
  • When you use power — using power in daylight saves the full retail rate; a battery lets you use more of your own solar at night.
  • System size — a system matched to your usage pays back faster than an oversized one.

Your free solar savings assessment

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Solar calculator — common questions

How accurate is this solar calculator?

It gives an indicative estimate based on Australia regional solar output and average power prices — good for a ballpark. Your exact saving depends on your roof, shading, usage pattern and power plan, which a vetted local installer confirms at a free on-site assessment.

How much can solar save my Australian home?

Most Australian homes save around $1,000–$2,500 a year, and payback is fast (typically 3–6 years) thanks to the rebate and high power prices. Use the calculator above for a state estimate.

Does the calculator include the rebate?

Australian system prices are quoted after the federal STC rebate, so the payback shown already reflects the rebate-reduced cost. Battery rebates apply on top if you add storage.

What size solar system do I need?

As a rough guide, match the system to your power bill: smaller bills suit a 3–5 kW system, average homes a 6.6 kW system, and larger homes or those with EVs a 9–10 kW system. The calculator suggests a size from your bill; your installer confirms it.

Is solar worth it?

For most Australian homes, yes — payback is typically 3–6 years, one of the fastest in the world. See our full is-solar-worth-it guide.

Get your exact solar numbers.

Free, honest, about a minute. A vetted local installer confirms the real figures for your roof.

Get my free assessment →