Compare several written quotes and check that the installer holds the relevant state or territory electrical licence and current Clean Energy Council accreditation. Confirm the quote covers system design, permits, grid connection, switchboard work, monitoring, and removal of old equipment where needed. Ask for product and workmanship warranties, likely installation timeframes, after-sales support and the company’s insurance details. Federal incentives such as Small-scale Technology Certificates and state programs can change, so confirm current eligibility through energy.gov.au and your state government before signing.