News

The photovoltaic power generation system is mainly composed of photovoltaic modules, controllers, inverters, batteries and other accessories (battery is not required for grid connection). According to whether it depends on the public grid, it is divided into two types: off-grid and grid-connected. The off-grid system operates independently and does not need to rely on the grid. The off-grid photovoltaic system is equipped with a battery with energy storage function, which can ensure the stable power of the system, and can supply power to the load when the photovoltaic system does not generate power at night or when the power generation is insufficient in cloudy and rainy days.

Regardless of the form, the working principle is that the photovoltaic module converts light energy into direct current, and the direct current is converted into alternating current under the action of the inverter, and finally realizes the functions of electricity consumption and Internet access.

1. Photovoltaic modules

Photovoltaic modules are the core part of the entire power generation system. They are composed of photovoltaic module sheets or photovoltaic modules of different specifications cut by laser cutting machines or wire cutting machines. Since the current and voltage of a single photovoltaic cell are very small, high voltage should be obtained in series first, then high current should be obtained in parallel, output through a diode (to prevent current return), and then encapsulated in a stainless steel, aluminum or other non-metallic On the frame, install the top glass and the back panel on the back, fill with nitrogen, and seal. The photovoltaic modules are combined in series and parallel to form a square array of photovoltaic modules, also called a photovoltaic array.

Working principle: Sunlight shines on the semiconductor p-n junction to form new hole-electron pairs. Under the action of the p-n junction electric field, the holes flow from the p region to the n region, and the electrons flow from the n region to the p region. form a current. Its function is to convert solar energy into electrical energy and send it to the battery for storage, or to drive the load to work.