The design idea of solar street lamps

Design requirements: 1, the solar cell component selection in the Beijing area, the load input voltage 24 v power 34. 5 w, work 8 hours a day. 5 h, to guarantee the continuous rainy days 7 days. Annual average radiation 107 (1) in the Beijing area in recent 20 years. 7 kcal/cm2, the simple calculation in the Beijing area peak

1, the solar cell component type selection design requirements: in the Beijing area, LED street lamp, load input voltage 24 v power 34. 5 w, work 8 hours a day. 5 h, to guarantee the continuous rainy days 7 days. Annual average radiation 107 (1) in the Beijing area in recent 20 years. 7 kcal/cm2, the simple calculation peak sunshine time is about 3 in the Beijing area. 424h； 2 load day power consumption = 12. 2 ah (3) the required total solar charging current = 1. 05×12. 2×（ 20 + 7) ÷20÷（ 3. 424×0. 85). = 5. 9 a here, the design of the shortest days between two consecutive rainy days for 20 days, 1. 05 for solar cell component system comprehensive loss coefficient, 0. 85 for battery charging efficiency. (4) solar module on the number of minimum total power = 17. 2×5. 9 = choose peak output power of 102 w 110 wp, single piece of 55 wp standard cell components, should be able to guarantee in most cases a year of street lamp system normal operation.