Solar PV Testing and Commissioning is a practical guide to one of the most critical stages in the lifecycle of a photovoltaic (PV) power plant. It explains how testing and commissioning verify that every component is installed correctly, operates safely, complies with engineering standards, and performs as designed before commercial operation. A systematic commissioning process minimizes risks, improves reliability, and protects the investment made in solar energy projects. Written for engineers, technicians, EPC professionals, commissioning engineers, quality assurance personnel, project managers, and engineering students, this book presents commissioning as a structured engineering discipline rather than a simple checklist. It combines technical knowledge with systematic testing, safety management, performance verification, documentation, and troubleshooting. The book follows the complete commissioning workflow, covering solar PV fundamentals, pre-commissioning inspections, component verification, electrical testing, commissioning procedures, testing instruments, protection systems, safety requirements, SCADA integration, performance evaluation, and final acceptance testing. Readers learn practical methods for inspecting and commissioning solar modules, PV strings, cables, combiner boxes, inverters, transformers, switchgear, protection relays, grounding systems, medium-voltage equipment, and grid interconnection facilities. It explains continuity testing, insulation resistance testing, grounding verification, polarity checks, string testing, functional testing, inverter commissioning, protection testing, and system performance verification using recognized industry practices. Practical examples, inspection checklists, troubleshooting techniques, commissioning documentation, and real-world project scenarios help bridge the gap between engineering theory and field application. Whether you are beginning a career in renewable energy or managing utility-scale and commercial solar projects, this book serves as both a structured training resource and a practical field reference, equipping you with the knowledge and engineering best practices to inspect, test, commission, troubleshoot, and successfully hand over solar PV systems safely, efficiently, and in accordance with international industry standards.