1, solar battery components selection design requirements: the Beijing area, the load input voltage 24V power consumption 34.5W, daily working hours 8.5h, to ensure that the seven days of consecutive rainy days. (1) Beijing area for the last two years the average annual amount of radiation 107.7Kcal/cm2, by a simple calculation about 3.424h; ⑵ load day = 12.2AH ⑶ total solar components required charging current of the power consumption peak sunshine hours = 1.05 × 12.2 × (20 +7) ÷ 20 ÷ (3.424 × 0.85) = 5.9A in two consecutive rainy days between the design of the shortest days to 20 days, 1.05 for the solar module system loss coefficient, 0.85 battery charging efficiency. ⑷ solar modules at least total power = 17.2 × 5.9 = the 102W selection of peak output power of 110Wp, the single block 55Wp the standard battery components, should be able to ensure the normal operation of the street lighting system in a year in most cases.