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3, solar lantern system design ideas and points
The same basic principles of solar photovoltaic systems, solar lantern design therefore also be based on the general idea of ??a solar power generation system, first determine the power of the solar cell module, and then calculate the battery capacity. But solar street has its particularity, the need to ensure a stable and reliable operation of the system, so they need special attention in the design.
Now, an example of solar lantern system design elements, such as: the need to install a number of solar lights in a city, light power is 30W, the requirements street work eight hours a day to ensure continuous seven rainy days to work properly. Local longitude 114 degrees, 23 degrees north latitude, the annual average daily solar radiation was 3.82 KW.h / m2, the average monthly temperature of 20.5 degrees, the time interval of two consecutive rainy days 25 days long.
Based on the above information, calculate the PV module inclination angle of 26 degrees, a standard peak number of 3.9 hours. (1) load on power consumption
Q = W * H / U = 30W × 8H ÷ 12V = 20 Ah battery where U is the nominal voltage system
The charging current I1 (2) satisfy the load on the power of the solar cell module = Q * 1.05 / h / 0.85 / 0.9 = 7.04 A
Where 1.05 is an integrated solar charging loss coefficient, 0.85 for the battery charging efficiency, 0.9 for the controller efficiency. (3) determine the battery capacity
Meet eight consecutive rainy days working normal battery capacity C
C = Q * (d + 1) /0.75*1.1=20*8/0.75*1.1=235Ah take 240Ah formula for the battery discharge depth of 0.75, 1.1 safety factor batteries. Select two 12V / 120Ah battery comprising a battery
(4) after consecutive rainy days need to restore the battery capacity of the solar cell module charging current I2 I2 = C * 0.75 / h / D = 240 * 0.75 / 3.9 / 25 = 1.85A where 0.75 for the battery discharge depth

Power (5) solar modules for the (I1 + I2) * 18 = (1.85 + 7.04) * 18 = 160Wp
18 is a solar cell module in which the operating voltage, select two peak power of the solar cell module 80Wp
4. Selection of the key components of solar lantern 4.1 solar components
Voltage solar modules will decrease with increasing temperature, due to the effects of high temperatures, the battery pack voltage loss of about 2V, and a diode drop 0.7V charging process controller, so choose the operating voltage of 18V components.
Due to the special nature of solar lights, solar panels are generally mounted on poles,

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