Compare more than the total price: check the system size, panel and inverter brands, estimated annual generation, installation details and whether monitoring is included. Confirm that the quote clearly explains any government incentives, such as Small-scale Technology Certificates (STCs), and whether the advertised price depends on eligibility or other conditions. Look for separate product and workmanship warranties, realistic performance estimates and the installer’s relevant accreditation and experience. Before signing, check the contract and ask an accredited installer to explain anything unclear, as actual savings depend on your home, tariff, usage and installation.