Because solar systems have no moving parts, they very reliable and require little maintenance.
Solar modules come with a manufacturer’s warranty for a lifecycle of between 20 and 25 years. Depending on the quality, the installation can last up to 30 years. PV modules typically don’t “die” when they get old; rather their output begins to diminish. For example, after about 20 years, the output drops to about 80% of nominal. Modern inverters have a useful life of up to 20 years, with manufacturers now offering warranties of between five and ten years.