The commissioning period is 1.5-2 years. According to the inquiry of photovoltaic official website, the production cycle of photovoltaic EVA is 3.5-4 years, including 2 years of construction and 1.5-2 years of commissioning. Photovoltaic engineering is an equipment project that uses solar energy to generate electricity, and it is the photovoltaic engineering in mbth. The key part of this technology is solar cells. After the solar cells are connected in series, they can be packaged and protected to form a large-area solar cell module, and then form a photovoltaic power generation device with power controllers and other components. Photovoltaic engineering includes the system engineering of researching and developing solar power generation, while another meaning of photovoltaic engineering refers to the equipment engineering of using solar power generation.