Check that the installer uses appropriately accredited and licensed professionals, and ask for a detailed quote covering system size, expected output, equipment brands, installation work and any extra fees. Compare warranties, after-sales support, references and independent reviews, rather than choosing on price alone. Confirm who will handle network approval, meter changes and any available rebates or certificates, as eligibility and value can depend on your circumstances and location. Read the contract carefully, including payment terms, cancellation rights and performance assumptions, and consider getting advice from a qualified electrician before signing.