Commissioning of photovoltaic equipment

Installation Instructions 

Safety First 

Personal protective equipment: The photovoltaic equipment recycling manufacturer reminds you that installers must wear appropriate personal protective equipment, including safety helmets, safety shoes, gloves, etc. When working at heights, secure the safety belt and ensure that the anchor point of the safety belt is firm and reliable. For example, when installing rooftop photovoltaic equipment, the safety belt should be fixed to the stable structure of the roof, such as the steel structure of the building or specially set anchor points. 

Electrical Safety: During the installation process, ensure that the power supply of photovoltaic modules and inverters and other equipment is disconnected to prevent electric shock accidents. When connecting electrical circuits, use insulated tools to avoid circuit short circuits. For devices with capacitors, such as inverters, perform discharge treatment before installation to eliminate potential electric shock hazards. 

Installation accuracy requirements 

Photovoltaic modules: When installing photovoltaic modules, they should be installed strictly according to the designed angle and spacing. The deviation of the module installation angle should generally not exceed ±1°, and the spacing should ensure that there is no shadow obstruction between the modules when the sunlight is at its strongest. For example, in the Northern Hemisphere, the optimal installation angle of photovoltaic modules is usually the local latitude plus a certain angle compensation (generally 10 - 15°), in order to obtain the maximum solar radiation. 

Support installation: The installation of the supports must ensure both levelness and verticality. For ground-mounted supports, the vertical deviation of the columns should not exceed 3mm per meter; for roof-mounted supports, the connection with the roof must be firm and reliable, and adjustments should be made according to the actual conditions of the roof (such as slope, load-bearing capacity, etc.) to ensure that the supports can evenly bear the weight of the photovoltaic modules. 

Sequence of equipment transportation and installation 

Equipment Handling: When transporting photovoltaic equipment, handle it with care and avoid collisions and violent vibrations. For large photovoltaic modules and inverters, use appropriate handling tools such as forklifts and cranes, and lift and transport them according to the center of gravity position of the equipment. For example, if a photovoltaic module is subjected to severe collision during transportation, it may cause the internal battery cells to crack or be damaged, thereby affecting the performance of the module. 

Installation sequence: Generally, the brackets are installed first, followed by the photovoltaic modules, and then the electrical equipment such as inverters are installed. When installing the brackets, start from the base part and gradually install each component upwards to ensure the stability of the bracket structure. When installing the photovoltaic modules, arrange them in a certain order. Usually, start from one end and install them piece by piece, and perform electrical connections while installing to reduce the workload and the possibility of errors in the subsequent work.

Consideration of environmental factors 

Weather conditions: Avoid installation during adverse weather conditions such as strong winds, heavy rain, thunderstorms, and lightning. When installing in hot weather, be sure to prevent the installation personnel from getting heatstroke. At the same time, consider the expansion coefficient of the equipment and materials under high temperatures to avoid installation being too tight or too loose due to thermal expansion and contraction. For example, when installing the bolt connections of the support during the hot summer period, appropriate gaps should be left to prevent the bolts from loosening due to contraction when the temperature drops. 

Surrounding environment: The area around the installation site should be kept clean. Installation should not be carried out near flammable or explosive materials. If the installation site is close to a water source, waterproof measures should be taken to prevent the equipment from getting wet. For example, when installing photovoltaic equipment near a river or pond, waterproof embankments or covers should be set up for electrical equipment such as inverters to ensure the safety of the equipment. 

Debugging Precautions 

Pre-check before debugging 

Equipment connection check: Before commissioning, it is necessary to recheck whether the electrical and mechanical connections between the equipment are correct and secure. For the series and parallel connections of photovoltaic modules, it is necessary to check whether each connection point is in good contact, and whether there are any looseness or false connections. For the input and output lines of the inverter, it is necessary to check whether the phase sequence and polarity are correct, and whether the insulation of the lines is good. 

Equipment status check: Check if the appearance of the equipment is damaged, and whether the display screen, indicator lights, etc. are functioning properly. For photovoltaic modules, check if the surface is clean and if there are any obstructions; for inverters, check if the cooling fans can operate normally and if there are any abnormal sounds or odors inside. 

Parameter settings and testing 

Photovoltaic module test parameters: When debugging photovoltaic equipment components, special attention should be paid to parameters such as open-circuit voltage, short-circuit current, maximum power point voltage and current. The testing of these parameters should be conducted under standard test conditions (irradiance of 1000W/m², spectrum of AM1.5, temperature of 25℃). If the actual test conditions are different from the standard conditions, corrections should be made according to the corresponding temperature coefficient and light intensity coefficient. For example, when the temperature rises, the open-circuit voltage of the photovoltaic module will decrease, and the short-circuit current will increase. Adjustments need to be made according to the temperature characteristic curve of the component. 

Inverter test parameters: For inverters, parameters such as input and output voltages, frequencies, power, and conversion efficiency need to be tested. When setting the parameters of the inverter, adjustments should be made according to the requirements of grid connection and the characteristics of the load. For example, in China, the rated voltage of the grid is 380V/220V, and the frequency is 50Hz. The output parameters of the inverter should match these requirements, and reasonable protection parameters such as overcurrent protection, overvoltage protection, and undervoltage protection should also be set. 

Safety protection and emergency measures 

Safety protection measures: During the debugging process, it is necessary to ensure that the safety protection functions of the equipment are functioning properly. For instance, the anti-islanding protection of photovoltaic modules and the over-temperature protection of inverters should be able to trigger normally. If any abnormal conditions occur in the equipment during the debugging process, such as overcurrent, overvoltage, short circuit, etc., the equipment should be able to automatically cut off the circuit to protect the safety of the equipment and personnel. 

Emergency measures: On-site debugging should be equipped with necessary emergency equipment and tools, such as fire extinguishers, first aid kits, etc. Debugging personnel should be familiar with emergency handling procedures, such as how to use fire extinguishers in case of fire, and how to perform first aid in case of injuries. At the same time, an emergency plan should be formulated, clearly stating how to carry out personnel evacuation and equipment protection in case of unexpected situations. 

Data recording and analysis 

Record content: During the debugging process, detailed records should be made of various parameters of the equipment and the problems encountered and their solutions during the debugging. For example, record the voltage, current, power and other parameters of each photovoltaic module string, and record the changes in the conversion efficiency of the inverter under different load conditions. These recorded data are extremely important for the subsequent maintenance and performance evaluation of the equipment. 

Data Analysis: Analyze the recorded data to determine if the equipment is operating normally. If any abnormal data is detected, promptly investigate the cause and take appropriate actions. For instance, if a certain photovoltaic module string shows a significantly lower power output compared to other strings, it might be due to component damage, poor connections, or shadow obstruction. Further inspection and repair are necessary.