☀️ 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.
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.