Solar panel cost depends on the system size, panel and inverter quality, roof access, installation complexity and your location. The advertised price may include an upfront discount linked to Small-scale Technology Certificates (STCs), but the value can change and eligibility rules apply. Batteries, switchboard upgrades, monitoring equipment and additional electrical work can add to the total, while finance may increase the overall amount paid. Compare itemised quotes from accredited installers and check current STC information on the Clean Energy Regulator website before deciding.