In this forum, structure engineer John Smart came to power speech titled "PV tracker weatherability and reliability analysis" report, report to the mainstream tracker needs all kinds of problems from two aspects of structure and electric control was analyzed, and the Versol's tracker after years of foreign project experience, accumulated a lot of design installation data. In the final questions in the forum, engineer answer the audience of some professional questions, and explain to the "China's load model, and specification for steel structure calculation, is not very suitable for design guidance to the tracker, need additional examples, the reason is that China's load code for the coefficient of different angles is a single linear growth, do not conform to the actual tracker by the wind, the steel structure calculation without torque calculation for the corresponding norms, we adopted in the design of wind tunnel experiment data of CPP and increases the manual calculation of torque, to all aspects of the tracker is calculated, to ensure the high reliability of the tracker."