How fast will solar pay you back?
Plug in your postcode and bill. We'll show your estimated payback, annual savings and 25-year ROI based on real 2026 Australian solar prices, feed-in tariffs and sunshine data.
A battery shifts daytime solar to evening use. Best ROI when you have time-of-use power pricing or evening peak loads.
If you've got a real quote, pop the fully-installed price in here to see your payback. Leave blank to just see generation and savings.
10 kW system in Queensland
Based on: 10 kW @ 5.2 sun-hrs/day, 32¢/kWh power price, 6¢/kWh feed-in, 35% self-use, 0.85 performance ratio, 25 yr horizon, 2026 data.
Estimates are based on 2026 averages from public sources (SolarQuotes, AER, BoM, IPART, QCA). Actual results vary with roof orientation, shading, occupancy patterns, your retailer's tariff, and panel choice. We hold no responsibility for decisions made on the basis of these estimates. For a real quote, get in touch.
How we calculate this
Annual generation = system kW × peak sun hours per day × 365 × 0.85 (the performance ratio derate covers shading, inverter losses, dirt and temperature).
Annual savings = self-use kWh × your power price + export kWh × your retailer's feed-in tariff. Self-use is usually 25–40% for homes without a battery.
Payback = your quoted system cost ÷ annual savings. Drop a real, fully-installed quote into the "Your quoted system cost" field above to see your payback. We don't pre-fill a number, because no two installs are priced the same and we don't want to set a figure that won't match your actual quote.
Battery payback uses your quoted battery cost ÷ the extra solar self-use the battery unlocks at your power rate.
25-year ROI assumes flat savings over the panel warranty horizon. We keep it conservative on purpose. In reality electricity prices have risen ~5% per year on average, so most homes will outperform this number.
Sun-hour, electricity rate and feed-in tariff defaults vary by state. Check the assumption strip on your result for the exact numbers used.
- https://www.solarquotes.com.au/panels/cost/
- https://solarcalculator.com.au/solar-rebates/
- https://www.canstar.com.au/energy/electricity-costs-kwh/
- https://www.aer.gov.au/
- https://wattever.com.au/
- https://www.bom.gov.au/climate/maps/averages/solar-exposure/
- https://www.dcceew.gov.au/energy/renewable/cheaper-home-batteries
30 year workmanship warranty
30 year panel warranty
10 year inverter warranty
10 year battery warranty
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