Start by comparing several written quotes that clearly list the panels, inverter, system size, installation work and total price. Check whether the installer is accredited by the Clean Energy Council and holds the required electrical licences for your state or territory. Ask about product and workmanship warranties, after-sales support, monitoring and expected installation timeframes. A reputable installer should inspect your roof, switchboard and electricity use before recommending a system, rather than relying on a quick online estimate. Review the contract carefully and verify any rebate or finance details through the official energy.gov.au website.