One: First calculate the current:
Such as: 12V battery system; 30W lamp 2, total 60 watts.
Current = 60W÷12V= 5 A
II: Calculate the battery capacity requirement:
Such as: street lighting time of 9.5 hours per night, the actual full-load lighting for 7 hours (h);
Example 1: 1 LED lamp
(eg start 100% power at 7:30 pm, drop to 50% power at 11:00 pm, 100% power after 4:00 AM, close at 5:00 AM)
Example 2: 2-way non-LED lights (low pressure sodium lamp, electrodeless lamp, energy-saving lamp, etc.)
(Such as two-way start at 7:30 in the evening, 1 road at 11:00 in the evening, 2 roads in the morning at 4:00, and close at 5:00 in the morning)
Need to meet the lighting needs of continuous rainy days for 5 days. (5 days plus lighting one night before rainy days, totaling 6 days)
Battery = 5A × 7h × (5 + 1) days = 5A × 42h = 210 AH
In addition, in order to prevent the battery from over-charging and over-discharging, the battery is generally charged to about 90%; the remaining 5% to 20% of the discharge.
So 210AH is only about 70%-85% of the true standard in the application. In addition, according to the different load, measure
At the time of loss, the actual operating current is affected by the constant current source, ballast, line loss, etc. It may increase on the basis of 5A.
15%-25%.
Three: Calculate the peak demand of the panel (WP):
The cumulative lighting time of the street lights needs to be 7 hours per hour (h);
★: The panel receives an average of 4.5 hours of light (h) per day;
At least relax 20% of the panel's demand for reservations.
WP ÷ 17.4V = (5A × 7h × 120%) ÷ 4.5h
WP÷17.4V = 9.33
WP = 162(W)
★: The daily illumination time of 4.5h is the sunshine coefficient near the middle and lower reaches of the Yangtze River.
In addition, in the solar street lamp assembly, the line loss, the loss of the controller, and the power consumption of the ballast or the constant current source are all different, and the actual application may be about 15%-25%. Therefore, 162W is only a theoretical value and needs to be increased according to the actual situation.
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