With the extensive use of traditional fossil energy, the harm to the environment has become increasingly prominent. Solar street lamp power supply is an internationally recognized and advocated green power supply mode, which has the characteristics of energy conservation and pollution reduction. Because LED uses low-voltage DC power supply, the combination of LED street lamps and solar panels is the best combination of photovoltaic lighting, and eliminates many potential safety hazards caused by various factors such as construction quality, engineering transformation, and material aging.

The system of centralized mains complementary solar street lamp is composed of solar cell module array, battery pack, intelligent controller, load (LED street lamp) and mains switching device. The working principle of the system is: under the control of the intelligent controller, the solar cell array charges the battery pack in the daytime, and the battery pack provides power to the load at night. When the solar power cannot meet the load demand, switch to the mains power supply system,

The economic and technical evaluation of the centralized municipal electricity complementary solar street lamp system Taking the centralized municipal electricity complementary solar system in the expressway service area as an example, a new economic and technical evaluation method of the centralized municipal electricity complementary solar street lamp power supply system and the concepts of process payback period and life cycle payback period are proposed, The process payback period and the static and dynamic payback period within the service life of the centralized mains complementary solar street lamp system are calculated by comparing with the electric street lamp, which provides a set of feasible technical and economic analysis methods for the application of centralized mains complementary photovoltaic lighting.