In the first mode, there are two working environments, namely when high light intensity and no light environment.When the light intensity is high, the solar cell supplies the double load and charges the excess power into the battery; In no light, the photovoltaic array does not work, only the battery works to provide power for the double load.The second mode is a working mode chosen when the light intensity is not strong. At this time, the solar cell produces low energy and cannot meet the load, so it needs to work with the energy storage device to supply the load.The third mode is a working mode enabled when the light is insufficient and the battery is dead. When the load should be closed, charge the battery first, and the second working mode is enabled after the battery is full.The total system structure is shown in Figure 2-1.