Commercial solar cost in Australia varies widely, depending on system size, roof or ground-mount requirements, panel and inverter quality, electrical upgrades, site access and whether battery storage is included. A small business system may cost tens of thousands of dollars, while larger systems can reach six figures before incentives and financing costs. Eligible projects may receive certificates or other incentives, but the value and eligibility depend on the system, installation date and current government rules. Request itemised quotes from several accredited installers and check the latest information on energy.gov.au before comparing payback estimates.