In Australia, many solar installers provide an initial quote at no charge, but some may charge for a detailed site assessment or consultative service. Ask whether the quoted price includes GST, installation, electrical work, approvals, monitoring, and any required switchboard upgrades. Compare written quotes based on the system design, panel and inverter warranties, installer accreditation, expected performance and after-sales support—not just the lowest price. Before paying a deposit or accepting an offer, check the installer’s terms and consider getting independent advice from a licensed electrician.