NABCEP Technical Sales Practice Exam 2025 – All-in-One Guide to Master Your Certification!

Module mismatch refers to the inconsistent performance among solar modules within a system, leading to reduced overall efficiency and energy output. This phenomenon occurs when solar panels have different electrical characteristics, such as voltage or current outputs, which can result in inefficiencies.

When modules are not matched in terms of their power ratings or operational efficiency, the performance of the lower-performing modules can drag down the overall output of the system. For instance, if one module is shaded or damaged and produces significantly less power than the others, it can cause the entire string of modules to operate at that lower performance level due to the way they are wired together.

Matching modules in terms of their specifications—such as size, output ratings, and performance characteristics—ensures that all modules contribute effectively to the system's energy production, maximizing the efficiency of the solar array and minimizing losses caused by this mismatch effect.