AU SolarApril 3, 2026 · 8 min read · Australia
Solar Panel Cost Australia 2026 System Sizes, Rebates & ROI
A 6.6kW solar system in Australia costs A$4,500-7,000 after the STC rebate (saves ~A$2,500). Payback: 3-6 years. Australia has the highest residential solar adoption in the world.
6.6kW is the most popular size
6.6kW is the most popular size — matches most inverter capacities
STC rebate worth ~A$2,500 in 2026 (reducing annually until 2030)
STC rebate worth ~A$2,500 in 2026 (reducing annually until 2030)
Payback: 3-4 years in SA/NSW (high rates), 5-6 in QLD (low rates)
Payback: 3-4 years in SA/NSW (high rates), 5-6 in QLD (low rates)
Feed-in tariffs: 3-12c/kWh depending on state and retailer
Feed-in tariffs: 3-12c/kWh depending on state and retailer
25-year panel life with 0.5%/yr degradation
25-year panel life with 0.5%/yr degradation — excellent long-term value
Disclaimer: For educational reference. Consult a licensed professional.