Solar Cell Component Selection

2.1 Solar Cell Component Selection

Design requirements: Guangzhou area, the load input voltage 24V power 34.5W, daily working hours 8.5h, to ensure the number of consecutive rainy days for 7 days.

⑴ Guangzhou average the last two decades the amount of radiation 107.7Kcal/cm2, by simple calculation, the peak sunshine hours in Guangzhou is about 3.424h;

⑵ the load on power consumption = = 12.2AH

⑶ solar modules required for the total charge current = 1.05 × 12.2 × ÷ (3.424 × 0.85) = 5.9A

Here, two consecutive rainy days the number of days between the design of the shortest 20 days, 1.05 for the solar cell component systems integration loss coefficient, 0.85 for the battery charging efficiency.

⑷ solar modules for at least the number of total power = 17.2 × 5.9 = 102W

Selected peak output power 110Wp, a single block 55Wp standard battery components, should be able to ensure the street system in the year, the majority of cases of normal operation.

2.2 Battery Selection

Calculation of the design capacity of batteries compared to the peak-watt solar modules should be simple.

Based on the above calculations to know the load on power consumption 12.2AH. In the battery is full of circumstances, it can work continuously seven rainy days, plus the first night of work, battery capacity:

12.2 × (7 +1) = 97.6 (AH), use two sets of batteries to meet the requirements 12V100AH had.