Compare several written quotes covering panel and inverter models, system design, warranties, installation costs, grid connection and after-sales support. Check the installer’s electrical licence with your state or territory regulator and look for current Clean Energy Council accreditation where relevant. If the quote includes small-scale technology certificates (STCs), confirm the system and installer meet the scheme’s requirements; the value and eligibility can change. Review the contract carefully and verify rebate or incentive details through energy.gov.au or the relevant government department before signing.