Solar Savings Calculator
Estimate your annual electricity bill savings from rooftop solar. Includes state-specific sun hours, self-consumption, and payback period.
Payback period (optional — enter system cost)
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How solar savings are calculated
Your savings come from two sources: electricity you generate and use yourself (avoiding grid purchases), and surplus you export back to the grid for a feed-in tariff.
Useful extras for tracking energy savings
These help you keep tabs on usage, cable mess and the small stuff around home charging. SmartKoala may earn from qualifying purchases.
Energy gear that actually fits the savings angle
These are the products most likely to matter if you are acting on the numbers in this page. SmartKoala may earn from qualifying purchases.
Key factors
- Self-consumption is worth far more than exports — you save the full retail tariff (30c+) vs earning just 5–10c for exports.
- North-facing roofs in Australia maximise solar production. East/west roofs produce 15–20% less.
- Adding a battery can increase self-consumption from ~30–40% to 70–90% for households out during the day.
- System degradation: Panels lose about 0.5% efficiency per year, so a 25-year estimate should account for ~12% lower output over time.
Fun fact: Australia has the highest per-capita rooftop solar installation rate in the world. Over 3.5 million Australian homes now have solar panels — roughly 30% of all suitable homes.