Start by comparing several local installers who can assess your electricity use, roof, shading, switchboard and whether you may add a battery or electric appliances later. Ask for an itemised quote showing the proposed system size, panel and inverter brands, estimated generation, warranties, installation costs and any available incentives. Check the installer’s relevant state licence, accreditation and recent customer reviews, and confirm they will handle your electricity network’s connection requirements. A reputable installer should explain the assumptions behind the recommendation rather than simply selling the largest system.