There are three kinds of warranties relevant to your solar system: product warranties, production warranties, and installation warranties. Product warranties guarantee the physical integrity of the modules and other system components. For example, if one of your modules has a soldered connection fail, causing it to stop producing energy, it would be replaced under the product warranty. Most solar modules have a 10-year product warranty. Some high-end modules feature product warranties of 25 years or more. Inverters, devices that convert the DC electricity produced by your panels into AC that is used by your home, have product warranties from 10 to 25 years. String inverters may need to be replaced after 10 to 15 years. Some manufacturers offer the option of purchasing extended warranties for your inverters. The energy production warranty generally guarantees that a functioning module will produce at least 80% of its originally rated capacity for 25 years. While the details vary from manufacturer to manufacturer, this type of warranty provides assurance that your system will continue to produce power over its lifetime. In practice, identifying whether your system is experiencing a drop in performance that violates this warranty is difficult without the troubleshooting help of an installer. Despite that, production warranties are still a proxy for the expected performance degradation for your solar modules over time. Most solar modules have a 25-year energy production warranty. Some high-end modules feature warranties of 30 years. Installation warranties cover the workmanship of the installer and includes such things as the roof penetrations they make to attach your system to the building and the electrical wiring work. The length of installation warranties will vary from installer to installer but generally range from three to 10 years. Some installers will offer warranties as long as 20 years.