As solar becomes more popular, installers and equipment manufacturers are adding service options to differentiate their company from the competition. Extended service warranties (beyond the required five years), and annual maintenance services (panel cleaning, production assessment, inverter testing, etc.) might be available.
Equipment manufacturers are also raising the bar for customer service. Check out your equipment manufacturer website and/or call them directly as if you already own the system to assess how you will be treated after purchase. A hint of how the manufacturer treats customers is whether their website has a “Customers Only” section and whether an actual person answers their customer service line.