Testing of solar modules includes different electrical, performance, material & component, safety, and stress tests to ensure safety, durability, and long-term performance in various environmental conditions. Electrical and performance testing. Solar commissioning is the critical final phase that transforms a completed solar installation into a fully operational, performance-verified photovoltaic system. In this article, we'll review today's most common testing and certifications for solar panels. . DNV provides a variety of verification and inspection services in solar energy using a wide selection of test methods and testing technologies. DNV's independence from any manufacturer of photovoltaic modules or other equipment guarantees impartiality in our services. Services can be grouped into. . Our state-of-the-art PV testing and certification centers provide both safety and performance testing from a single source, including facilities in: Shanghai, China; Taipei, Taiwan; Cortland, New York; and Lake Forest, California.