Compare several detailed quotes, checking the panel and inverter brands, system size, warranties, installation inclusions and total price rather than choosing the cheapest offer. Ask how the federal Small-scale Renewable Energy Scheme (STCs) has been applied, as the value can change and eligibility depends on the system and installation details. Size the system around your household’s electricity use and daytime consumption, and compare the cost of adding a battery separately instead of assuming it will pay for itself. Use an appropriately accredited installer and confirm current incentives with the installer and official government information at energy.gov.au.