1. The calculation method of solar street light configuration is as follows
1: The first step is to calculate the system current:
Such as: use 12V battery system; 1 set of 30W high-power LED lights. Current = 30W÷12V = 2.5 A
2: Calculate the battery capacity requirement:
For example: the most complete knowledge of solar street lights in the history of solar street lights, the cumulative lighting time per night needs to be 6 hours at full load (h); (such as turning on at 7:30 pm, turning off at 11:30 at night, turning on at 4:00 am, and turning off at 6:00 am )
Need to meet the lighting needs of 4 consecutive rainy days. (4 days plus lighting the night before the rainy day, totaling 5 days) Battery = 2.5A × 6h × (4+1) days = 2.5A × 30h = 75 AH
In addition, in order to prevent the battery from being overcharged and overdischarged, the battery is generally charged to about 90%, and the remaining 20% is discharged. So 75AH is also only about 70% of the real standard in applications.3: Calculate the peak demand (WP) of solar panels in the solar street lamp knowledge system:
The cumulative lighting time of solar street lights needs to be 6 hours (h) per night; the average daily effective lighting time of the solar panel components is 4 hours (h); at least 20% of the reserved amount for the solar panel demand should be increased.
WP÷17.4V = (2.5A × 6h × 120%) ÷ 4h
WP÷17.4V = 4.5
WP = 78 (W)
Note: 4 hours of sunshine per day is the sunshine coefficient in most areas of my country.
In addition, in the solar street light assembly, the line loss, the loss of the controller, and the power consumption of the constant current source are different, which may be around 5%-25% in practical applications. Therefore, 78W is only a theoretical value, and it needs to be increased according to the actual situation.
It can be known from the above algorithm: 30W solar street light, full power lighting for 6 hours a day, guarantees 4 rainy days, and the configuration requirements in the area where the peak value of sunshine is 4 are as follows: solar panel 85W, colloidal battery 80AH.
Post time: Oct-24-2022