Compare several written quotes that clearly list the system size, panels, inverter, installation work, warranties and any ongoing costs. Check that the installer uses appropriately licensed electrical contractors and look for relevant Clean Energy Council accreditation, along with recent local reviews and references. Ask who will handle grid connection, meter changes and any Small-scale Technology Certificate paperwork. Before signing, confirm the payment schedule, maintenance arrangements and warranty process, and check details with your electricity distributor or state electrical safety authority if anything is unclear.