In Australia, the cost of an installed solar system depends on its size, panel and inverter quality, roof access, location and whether you add a battery. As a broad guide, a standard residential system may cost several thousand dollars after any applicable federal small-scale technology certificate discount, while batteries can add several thousand more. Prices and incentives change, and eligibility is determined under the relevant scheme rather than guaranteed by a quote. Compare itemised quotes from accredited installers and check current information at energy.gov.au before choosing a system.