Compare at least three written quotes, checking the panel and inverter brands, system size, estimated production, total price and any assumptions about your roof or electricity use. Confirm the installer’s electrical licence, relevant accreditation, insurance, workmanship warranty and who will handle warranty claims, rebates and grid-connection paperwork. Look for recent independent reviews and ask for references, but treat unusually cheap quotes or high-pressure sales tactics cautiously. Before signing, read the contract, payment schedule, performance estimates and exclusions, and consider having the proposal checked by a licensed electrician or solar professional.