Check your recent electricity bills, roof condition, available roof space, shading and switchboard before requesting quotes. Compare the system size, panel and inverter brands, estimated generation, warranties, monitoring and total installed price, including any applicable STC discount. Confirm the installer is properly accredited and ask about grid connection, permits, export limits and who will handle paperwork. If you are considering a battery, check its usable capacity, warranty and compatibility, then review the proposal with the installer and your electricity retailer.