Look for a current Clean Energy Council (CEC)-accredited installer with the relevant accreditation for your system, such as solar PV or battery storage. Verify their details through the CEC website, and also check that the business holds the required electrical contractor licence in your state or territory. Ask for a clear written quote covering equipment, installation, warranties, grid connection and any Small-scale Technology Certificate arrangements. CEC accreditation does not guarantee a particular result, so compare several quotes and confirm rebate eligibility with the installer and official government sources.