In a large area of China, solar street lights have become a popular trend. Solar street lights have become a beautiful landscape that can be seen from the head up. Solar street lights generate electricity on their own because they do not need the supply of city electricity, do not need to pull lines, and there are no safety hazards such as high voltage leakage. It is very energy-saving and environmentally friendly, so it is loved by the public and has been popularized in a few years.
The solar street lights are completely different from the traditional operation mode of using city electricity to work. All solar street lights use their own configuration of solar street light panels and solar street light batteries to cooperate with each other to convert electrical energy, store electrical energy, and release electrical energy for light output. . Therefore, the configuration of solar street lights is particularly important. How to realize the self-sufficiency of the electric energy of solar street lights is a very important thing.
The most important charging and discharging work of solar street lights are two important work points, and the most important components of charging and discharging work are solar street lamp battery panels and solar street lamp batteries, as well as the coordination and cooperation of street lamp lamp head power. The following is after many years The solar street lamp configuration parameter calculation formula summarized by the experience, use the following calculation formula to achieve a more scientific configuration, and the solar street lamp can last longer.
The following is the calculation method formula of solar street light configuration:
① Calculation method of solar street lamp current:
Such as: 24V battery system; 2 30W lamps, 1 watt in total.
Current=30W÷24V=1.25A
② Calculation method of solar street lamp battery:
For example, the accumulated lighting time of street lights every night needs to be 8 hours (h) at full load;
(For example, open at 8:00 in the evening, close 1 at 12:00 in the evening, open at 3:00 in the morning, and close at 7:00 in the morning)
Need to meet the lighting needs of 4 consecutive days of rainy and cloudy days. (5 days plus the lighting of the night before rainy day, total 5 days)
Storage battery=1.25A×8h×(4+1) days=1.25A×40h=50AH
One of the characteristics of the battery is that overcharge and overdischarge will shorten the life of the battery. Therefore, in order to protect the battery to have a longer service life, the battery is generally charged to about 90%; the remaining discharge is about 20%. So [FS:PAGE]50AH is only about 70% of the real standard in the application.
③ Calculation of peak demand for solar street light panels (WP):
The accumulative lighting time of street lights every night needs to be 8 hours (h);
★: The solar panels receive an average of 4.5 hours (h) of effective light per day; at least relax the 20% reserve for solar panels.
WP÷17.4V=(1.25A×8h×120%)÷4.5h
WP÷17.4V=2.67
WP=46.4(W)
The 4.5h daily sunshine time is the sunshine coefficient in southern China and nearby areas. If you calculate other regions, you need to adjust this parameter.
In addition, in the various components of solar street lights, the line loss of solar street lights and the electrical heating loss of controllers and other components need to be considered separately. The power consumption of ballasts or constant current sources is different. Therefore, in the actual solar street lights During work, the power loss will be about 20% (the floating value is generally about 15%). Therefore, 46.4W is only a theoretical value. If in actual conditions, the configuration of Henan solar street lights must be increased on this basis to be more scientific.