Compare several written quotes that clearly list the panels, inverter, system size, installation work, warranties and total costs. Check the installer’s relevant state or territory licence and whether they are accredited by the Clean Energy Council, particularly if you may claim small-scale technology certificates (STCs). Ask who will handle grid connection, approvals and after-sales support, and look for a clear contract rather than relying on verbal promises. Your final system design, approvals, incentives and expected savings depend on your property and circumstances, so confirm details with the installer, your electricity distributor and official energy.gov.au guidance.