This course is based on module 7 of ECREEE curriculum. This module aims at mastering the activities of carrying out preventive maintenance, diagnosis and troubleshooting of PV systems. This skill is divided into seven sub-skills. After the completion of the course, the students will have knowledge on identifying maintenance needs on system and component level, design appropriate maintenance plan and demonstrate proficiency in selecting and using of required tools, carry out visual inspections of the entire installation, check the mounting, ventilation, wiring and connection systems/junction boxes, verifying system operation by measuring system performance and electric parameters, by comparing with specifications and expected performance parameters, by performing diagnostic procedures and by recommending corrective actions, and compile and maintain records of system operations, performance and maintenance, as well as demonstrating knowledge of the environmental impacts.