Most reputable solar installers provide quotes at no upfront cost, although you should confirm this before booking an assessment. A useful quote should itemise the panels, inverter, mounting equipment, installation, electrical work, approvals, GST and any battery, while clearly showing whether advertised rebates or small-scale technology certificates (STCs) have been deducted. The total price varies with system size, roof access, equipment quality, switchboard upgrades and local requirements. Compare several written quotes and check the installer’s credentials, warranties and assumptions rather than choosing solely on the lowest price.