The photovoltaic power supply system of the mobile energy storage power station

The photovoltaic power supply system of the mobile energy storage power station is mainly composed of the following parts:

1. The role of photovoltaic modules: converting solar energy into DC power through the photoelectric effect, which is the energy source of the entire system. Common photovoltaic modules include monocrystalline silicon, polycrystalline silicon and thin-film photovoltaic cells. Monocrystalline silicon photovoltaic modules have high conversion efficiency, polycrystalline silicon photovoltaic modules have relatively low cost, and thin-film photovoltaic cells have the characteristics of flexible bending, which are suitable for different application scenarios. Installation method: In order to better receive sunlight, photovoltaic modules are usually installed on the top or side of the mobile energy storage power station. Some mobile energy storage power stations also use foldable, expandable or rotatable installation structures so that the angle of photovoltaic modules can be adjusted in different environments and usage requirements to maximize the efficiency of light energy absorption. For example, a mobile energy storage power station that is connected to the grid and operates off the grid has rotating plates on both sides of the energy storage mobile box. The bottom of the rotating plate is equipped with an expansion mechanism. The expansion mechanism includes a first photovoltaic power generation panel and a second photovoltaic power generation panel. The photovoltaic power generation panel can be unfolded and adjusted in angle by driving a motor and other devices to increase the power generation area and efficiency.

2. Energy storage system battery: used to store the electrical energy generated by photovoltaic modules to power the load when there is insufficient light or no light. Common batteries include lead-acid batteries, lithium batteries, etc. Lithium batteries have the advantages of high energy density, low self-discharge rate, and long cycle life, and have been widely used in mobile energy storage power stations. For example, lithium iron phosphate batteries are particularly suitable for mobile energy storage power stations with high safety requirements due to their high safety and long life. Energy storage inverter: It is a key device that connects photovoltaic modules, batteries and loads. It can convert the DC power generated by photovoltaic modules into AC power for AC loads, and can also convert AC power into DC power to charge batteries. In addition, the energy storage inverter also has the functions of controlling the charging and discharging process of batteries, adjusting the output voltage and frequency, etc., to ensure the stable operation and power quality of the system.

3. Charging controller function: Control and manage the charging and discharging process of batteries to prevent overcharging and over-discharging of batteries and extend the service life of batteries. The charging controller can automatically adjust the charging current and voltage according to factors such as the battery power state, the output power of photovoltaic modules and the power demand of the load to achieve intelligent charging control. Type: Common charging controllers include PWM (pulse width modulation) charging controller and MPPT (maximum power point tracking) charging controller. MPPT charging controller can track the maximum power point of photovoltaic modules in real time and improve the power generation efficiency of photovoltaic systems. Therefore, it is widely used in mobile energy storage power stations.

4. Inverter function: Convert the DC power output by the battery into AC power to meet the needs of the AC load. The performance of the inverter directly affects the power supply quality and efficiency of the system, so it needs to have the characteristics of high efficiency, stability and reliability. Type: According to the different output waveforms, the inverter can be divided into square wave inverter, modified wave inverter and sine wave inverter. The AC waveform output by the sine wave inverter is similar to the mains power, which can better meet the requirements of most AC loads. Therefore, sine wave inverters are usually selected in mobile energy storage power stations.

5. Monitoring and management system Monitoring function: Real-time monitoring of the output power of photovoltaic modules, battery voltage, current, power and other parameters, as well as the power consumption of the load, etc., and these data are transmitted to the monitoring center through sensors and data acquisition equipment. Control and management function: According to the monitored data, the system is intelligently controlled and managed, such as automatically adjusting the angle of the photovoltaic module, controlling the charging and discharging process of the battery, and realizing intelligent scheduling of the load, so as to optimize the performance and operation efficiency of the system and ensure the safe and stable operation of the system. At the same time, the monitoring and management system can also realize remote monitoring and operation, which is convenient for users to manage and maintain the mobile energy storage power station in real time.

6. Other auxiliary equipment distribution box: used to distribute and control electric energy, distribute the AC power output by the inverter to each load circuit, and have overload protection, short circuit protection and other functions to ensure the safety of electricity use. Cables and connectors: used to connect photovoltaic modules, energy storage systems, charging controllers, inverters, loads and other equipment to transmit electric energy. The selection of cables should be reasonably selected according to the voltage, current and other parameters of the system to ensure the efficiency and safety of power transmission. The connector needs to have good conductivity, waterproofness and reliability to ensure the stability and durability of the connection.