Solar LED lighting system technologies and engineering design
The Solar LED lighting is a practical knowledge website that organically combines the design of LED solar lighting system with lighting technologies engineering application
1. Photoelectric characteristics of solar cells When light shines on the solar cell, currents IR and IJ flow through the battery load resistance R and inside the battery respectively, where IJ is the forward current passing through the PN junction. When the light is constant, the photocurrent IP=IR+IJ is also constant. The flow of photocurrent inside and outside the…
The solar cell is the smallest unit of photoelectric conversion, and its size generally ranges from 4 to 100 cm2. The working voltage of a single solar cell is about 0.5V, and the working current is 20~25mA/cm2. Generally, it cannot be used as a photovoltaic power source alone. After the solar battery cells are packaged…
Solar cells are mostly made of semiconductor materials. So far, they have been developed in various types and forms. Various methods can be used to classify solar cells, such as different classifications according to different structures, different classifications according to different materials, different classifications according to different uses, and different classifications according to different working…
In 1839, the French Becqueral observed the photovoltaic effect in a chemical cell for the first time. In 1876, the photovoltaic effect was also observed in solid selenium (Se), and Se/Cuo photovoltaic cells were subsequently developed. Reports about silicon photovoltaic cells appeared in 1941. Bell Labs Chapin and others developed monocrystalline silicon solar cells with…
The lighting time of the current solar LED lighting system in sunny weather can be set according to user requirements, and for the same location, it is directly related to the selection and ratio of solar cell components and storage batteries. On the premise that the power of the light source is determined, the larger…
At present, the electricity consumed by lighting accounts for about 20% of the entire electricity consumption. Reducing the electricity consumption for lighting is an important way to save energy. In order to achieve this goal, the industry has researched and developed a variety of energy-saving lighting appliances, and achieved certain results. However, the requirements for…
When comparing the characteristics of silicon crystal solar cells and LEDs, it can be found that they have many similarities as follows: (1) All are semiconductor devices. Solar cells, like LEDs, are semiconductor devices, which are diodes made of PN structure. It’s just that solar cells convert light into electrical energy, and LEDs convert electrical…
(1) Controller. The function of the controller is to make the solar cells and storage batteries work efficiently, safely and reliably to obtain the highest efficiency and prolong the service life of the storage batteries. The controller controls the charging and discharging of the battery, and according to the power demand of the load, controls…
Solar LED lighting systems have different scales and application forms. The system scale spans a large range, ranging from 0.3~2W lawn lights to hundreds of watts of solar LED high-pole lights. Its application forms are also diverse, and can be widely used in many fields such as household, transportation, communication, space and so on. Although…
The principle of solar LED lighting The principle of solar LED lighting is shown in Figure 1. When light irradiates the surface of the solar cell, part of the photons are absorbed by the silicon material, and the energy of the photons is transferred to the silicon atoms, causing the electrons to undergo transitions, becoming…