Start by seeking quotes from several local installers, preferably those with relevant Clean Energy Council accreditation and experience with systems like the one you need. Ask each installer to itemise the panels, inverter, estimated generation, installation costs, warranties, approvals and any assumed incentives, including Small-scale Technology Certificates (STCs). Compare the equipment and design, not just the headline price, and check recent reviews, insurance and who will handle after-sales support. Before signing, confirm the proposal suits your property and circumstances with the installer, and check current incentive information on energy.gov.au.