Common issues include failures in electronic components such as solar panels and inverters, as well as external factors like grid disturbances and weather-induced damage. Drawing on years of on-site maintenance experience, Solis has identified recurring issues in photovoltaic system construction. Here, we explore these common challenges and provide actionable solutions to help ensure your PV project's success. Electrical faults are one of the leading causes of. This document, an annex to Task 13's Degradation and Failure Modes in New Photovoltaic Cell and Module Technologies report, summarises some of the most important aspects of single failures. The target audience of these PVFSs are PV planners, installers, investors, independent experts and insurance companies, and anyone interested in a brief description of failures with examples. Common faults discussed include panel degradation, electrical issues, inverter failures, and grid disturbances, all of which affect system efficiency and safety. While traditional diagnostics like thermal imaging and V-I curve analysis offer valuable insights, they mostly detect issues reactively. Several factors contribute to degradation, including exposure to sunlight, temperature variations, and environmental conditions.