In 2026, a typical Australian home solar system may cost around $4,000–$9,000 installed after the federal STC discount for a 6.6kW system, while larger systems can cost more. Prices vary with panel and inverter quality, roof access, location, switchboard work and installer fees, and a battery is usually an additional expense. The STC discount depends on system size, location and the certificate market, so it is not a guaranteed amount. Compare itemised quotes from accredited installers and check current incentive information at energy.gov.au.