18 w solar street lamp design scheme

18 w solar street lamp design requirements: guilin area county, the load input voltage 12 18 w power consumption, working hours, nine hours a day, guarantee continuous rainy days to five days. Reference data: guilin area average annual sunshine hours to 1670 hours, or about 4. 58 hours/day. Years ago

18 w solar street lamp design requirements: guilin area county, the load input voltage 12 18 w power consumption, working hours, nine hours a day, guarantee continuous rainy days to five days. Reference data: guilin area average annual sunshine hours to 1670 hours, or about 4. 58 hours/day. The average annual solar radiation is 3. 22KWH/M2. D daily total power consumption ( Watt hour) X = load power to work every day time = 18 w x 9 h = 162 wh load power consumption = total power consumption present every day working voltage = 162 wh present 12 v = 13. 5 ah the required total solar charging current = 1. 05×13. 5×÷（ 3. 22×0. 85). = 5. Here, the design of the shortest days between two consecutive rainy days for 5 days, 1. 05 for solar cell component system comprehensive loss coefficient, 0. 85 for battery charging efficiency. Solar module on the number of minimum total power = 18 x 5. 18 = 93. 22 w choose peak power output 96 wp standard battery components, LED street light, should be able to guarantee in most cases a year of street lamp system normal operation. Battery capacity calculation according to the above design calculation know, load, power consumption of 13. 5AH。 Under the condition of storage battery is full, can work for 5 consecutive rainy days, coupled with the first night work, battery discharge depth is 70%, battery capacity: 13. 5×（ 5 + 1) ÷70%=115（ AH） 12 v120ah, choose one battery can meet the requirements.