The main components of a photovoltaic system include:
Inverter. An inverter converts the direct current (DC) energy generated by photovoltaic (PV) cell modules into alternating current (AC) energy to power household or industrial equipment. Inverters also have multiple functions such as power control, voltage protection, and communication monitoring.
Support system. A support system is used to support and secure photovoltaic cell modules, ensuring they can effectively capture and utilize sunlight.
Cables and distribution boxes. This part is responsible for connecting the photovoltaic cell modules, inverters, and the power grid, including high-quality, low-loss cables and distribution boxes with waterproof, dustproof, and temperature-controlled functions.
Monitoring systems are typically used in large-scale photovoltaic power plants to monitor and record data such as the performance, output power, and temperature of photovoltaic modules, helping administrators to detect and handle faults in a timely manner.
In addition, photovoltaic systems also include components such as DC combiner boxes, DC distribution cabinets, AC distribution cabinets, and step-up transformers. These components together constitute different types of photovoltaic power generation systems, such as off-grid systems, grid-connected systems, and distributed systems.
A typical photovoltaic (PV) power generation system consists of modules, inverters, grid-connected boxes, support structures, and AC/DC cables. The modules are the core component of the system; they form an array to convert solar energy into electrical energy, thus generating PV power. The diagram below illustrates the process of a PV power station from power generation to grid connection. The module array is fixed to the roof using a support structure. The DC current generated by the array is transmitted through DC cables, converted to AC by the inverter, and then fed into the grid via the grid-connected box.
photovoltaic modules
As the core component of a photovoltaic power generation system, the important parameters of the module include power, voltage, current, length and width dimensions, and weight. Among them, the voltage and current of the module determine the type of inverter, and the length and width dimensions determine the number of modules that can be installed on a roof.
As can be seen, sunlight passes through the glass backsheet of the module, the N-type semiconductor inside the module moves towards the negative electrode, the P-type semiconductor moves towards the positive electrode, and current flows through after the external load forms a circuit.
Photovoltaic inverter
Inverters convert the direct current output from solar panels into alternating current (AC) that can be used by general electrical appliances. They also maximize the performance of solar cells and provide system fault protection. The selection of inverters for photovoltaic power plants must consider parameters such as the installed capacity of the power plant, the voltage and current of the solar panels, and the number of panels.
Photovoltaic grid-connected box
The grid-connected box mainly consists of disconnectors, circuit breakers and related control components. As the end of the photovoltaic power generation system, it connects the power grid and the power generation system, protects and measures the total amount of photovoltaic power generation, facilitates fault repair and management, and improves the safety and economic efficiency of the power generation system.
Photovoltaic support
As an important component of photovoltaic power generation systems, photovoltaic brackets mainly serve to connect the components to the roof. Taking a flat roof as an example, under the premise of ensuring the power station's load-bearing capacity and wind resistance are safe, the power station can be installed at an angle to maximize power generation and increase the owner's income.
TRW original guide rails feature a U-shaped cross-section design, providing compressive and bending resistance to meet the load-bearing requirements of power plants. Made of zinc-aluminum-magnesium galvanized steel, they have the advantage of self-repairing when rusted, making them not only corrosion-resistant but also aesthetically pleasing.
For photovoltaic power plants to have an operational lifespan of over 25 years, rigorous quality control is essential at every stage of construction. Trina Smart Distributed, a leading brand of distributed photovoltaics in China, consistently adheres to original equipment standards. Through systematic operation and management, standardized original equipment systems, and 24/7 remote monitoring and maintenance, it forms a closed-loop quality control system to ensure stable and continuous operation throughout the entire power generation lifespan. This creates tangible economic benefits for users, aligns with national strategies, and supports county-wide development, driving high-quality development of the industry through concrete actions!
Photovoltaic modules are the core component of the entire power generation system. They are composed of photovoltaic modules of different specifications, either individually cut by a laser cutter or a wire cutter, and then assembled together. Since the current and voltage of a single photovoltaic cell are very small, they are first connected in series to obtain a high voltage, then connected in parallel to obtain a high current. This current is output through a diode (to prevent current backflow), and then encapsulated in a stainless steel, aluminum, or other non-metallic frame. The top glass and backsheet are then installed, nitrogen is injected, and the system is sealed. Combining photovoltaic modules in series and parallel forms a photovoltaic module array, also known as a photovoltaic array.
Working principle: Sunlight shines on a semiconductor PN junction, forming new electron-hole pairs. Under the influence of the PN junction's electric field, holes flow from the P-region to the N-region, and electrons flow from the N-region to the P-region, forming a current when the circuit is connected. Its function is to convert solar energy into electrical energy, which is then stored in a battery or used to power a load.
Component type:
① Monocrystalline silicon: Photovoltaic conversion efficiency ≈18%, up to 24%, which is the highest among all photovoltaic modules. It is generally encapsulated with tempered glass and waterproof resin, making it sturdy and durable, with a service life of up to 25 years.
Photovoltaic power generation is based on the photovoltaic effect, using solar cells to directly convert sunlight into electrical energy. Whether off-grid or grid-connected, a photovoltaic power generation system mainly consists of four parts: photovoltaic modules, photovoltaic inverters, control cabinets, and cables. Off-grid power generation also requires batteries to store excess electrical energy for use during periods of insufficient sunlight or at night. These components are primarily electronic and do not involve mechanical parts; therefore, photovoltaic power generation equipment is extremely sophisticated, reliable, stable, long-lasting, and easy to install and maintain.
1. Photovoltaic modules:
Photovoltaic modules (also called solar panels) are the core and most important component of a solar power generation system. Their function is to convert solar energy into electrical energy, which is then stored in batteries or used to power loads.
2. Photovoltaic inverter:
An inverter is a device that converts direct current (DC) generated by photovoltaic (PV) power generation into alternating current (AC). PV inverters play a crucial role in maintaining balance within a PV system and can be used in conjunction with general AC power supply equipment.
Photovoltaic inverters can be broadly classified into the following three categories:
① Standalone inverter: Used in standalone systems, where the photovoltaic array charges the battery and the inverter uses the battery's DC voltage as its energy source.
② Grid-connected inverter: The inverter's output voltage can be fed back to commercial AC power, so the output sine wave needs to be the same as the phase, frequency and voltage of the power supply.
③ Backup battery inverter: A special type of inverter that uses a battery as its power source and charges the battery with a built-in battery charger. If there is excess power, it will be fed back to the AC power source.
3. Control cabinet:
It regulates and controls the charging and discharging conditions of the battery, and controls the power output of the solar cell modules and battery to the load according to the power demand of the load. It is the core control part of the entire system. With the development of the solar photovoltaic industry, the controller is becoming more and more powerful, and there is a trend to integrate the traditional control part, inverter and monitoring system.
