Compare more than the headline price: check the panel and inverter brands, system size, estimated generation, warranties, monitoring and expected installation date. Make sure the quote clearly lists switchboard upgrades, roof work, approvals, grid connection fees and any battery costs, so you can identify exclusions. Ask whether the advertised price assumes a discount from Small-scale Technology Certificates (STCs), as eligibility and value depend on the system, location and current rules. Confirm the installer’s electrical licence and relevant accreditation, and check any proposed export limits with your electricity distributor before signing.