The best solar panels generally cost more than entry-level models, with premium panels often priced at roughly $300–$700 each before installation. For a complete 6.6kW rooftop system, Australian quotes can vary from around $5,000 to $12,000 or more after incentives, depending on the panels, inverter, roof and installer. Prices and available STC discounts change, and batteries are usually an additional cost. Compare like-for-like quotes, checking efficiency, product and performance warranties, and whether the installer is accredited; the final price should come from a qualified installer.