Does a grid connected solar system need maintenance?
In general no. Most of the major components can be set and forget items. Solar panels may need to be cleaned but will function without fault if they are never touched. Most solar railing systems will only need to be touched if they are close the salt water and corrosion accrues or extra panels are required. Solar inverters nowadays are mainly made in a fashion that if anything ever goes wrong with the inverter it will require a replacement inverter to be installed or a service technician and no attention from the client will be needed for this as well. I general check-up of the system is advisable roughly every 3 years in conjunction with letters that some DNS (electrical distributers) send out advising that its good to make sure your system is safe and that all components are in good working condition.