The inverter serves as the sensing center of the entire power plant, with DC components on top and grid-connected equipment on the bottom. Basically all parameters of the power plant can be detected through the inverter. Generally, as long as the inverter is connected to the grid, the power curve displayed by the monitor is a normal "mountain" line, which proves that the power station is working stably. If an anomaly occurs, the health status of the power plant. Supporting equipment can be verified using information returned from the inverter. Growatt has compiled some information on common faults and handling methods for photovoltaic inverters below:
1. Low insulation resistance: Use the elimination method. Disconnect all strings from the input side of the inverter, then connect them one by one. Use the impedance detection functioninsulation when the inverter is turned on to detect the problem string. After finding the problematic channel, focus on checking the problematic channel. The DC connector has a water-immersed shorting socket. Or melt the short circuit support. Additionally, you can also check if the component itself has black spots on the edge and is burnt, causing the component to leak through the frame. the grate on the ground.
2. Low Bus Voltage: If this happens in the morning or late at night, it is a normal problem because the inverter is trying extreme power production conditions. If it happens during the normal day, the detection method is still the elimination method and the detection method is the same as point 1.
3. Leakage current fault: The root cause of this type of problem is the installation quality problem, caused by choosing the wrong einstallation location and poor quality equipment. There are many fault points: poor-quality DC connectors, poor-quality components, unqualified component installation heights, poor-quality network-connected equipment or water leakage. Once similar problems occur, you can find out the fault points by spraying powder and correct them. A good insulation job can solve the problem. If the problem is caused by the material itself, the material cannot be replaced.
4. DC Surge Protection: As components seek high-efficiency process improvements, power levels are constantly updated and increase at the same time, the open circuit voltage and operating voltage of components also increase. must be taken into account from the design phase to prevent low temperatures from causingdamage to equipment.
5. Inverter does not respond when turned on: Please make sure the DC input line is not connected backwards. Generally, the DC connector has anti-cheating effect, but the crimp terminals do not. have an anti-fouling effect. Read the inverter manual carefully to make sure it is correct. It is important to crimp the terminal after the negative terminal. The inverter has built-in reverse connection short circuit protection and will start normally after restoring normal wiring.
Unpack the package, read the product instruction manual carefully, and check whether the product model and parameters are correct and match the equipment. Installation must be carried out by personnel (instructors) with professional and technical knowledge. When installing wiring to the sun, photovoltaic solar panels must becovered to prevent high-voltage electric shock from photovoltaic cells and injury to people;
When installing, insert the removable movable mounting plates (4 pieces in total) into the housing respectively into the socket of the mounting plate at the bottom of the body, and fix it with two M8*8 screws, then use expansion screws to fix it at the installation position.
After the photovoltaic lightning protection combiner box is connected to the photovoltaic power generation system according to the installation principle and wiring diagram, the ground terminal of the lightning protection box Lightning should be reliably connected to the lightning protection ground wire or busbar, and the connecting wire should be as far away as possible. It can be short and straight, and the cross section of the connecting wire is not less than 16mm2 of stranded copper core. The value ofthe grounding resistance should not be greater than 4 ohms,Otherwise, the ground network must be rectified to ensure the lightning protection effect. It can only be put into service once the installation has been completed and verified.
The input terminal is located in the lower part of the chassis. Note that the connection with the positive output of the photovoltaic module is on the left side of the bottom, and the connection with the negative output of the photovoltaic module. The photovoltaic module is on the right side of the bottom. Users need to unscrew the waterproof terminal when wiring, then connect the cable to the fuse socket, then tighten the screws to fix the cable, and finally tighten the outer waterproof terminal.
The output includes the combined DC positive pole, DC negative pole and ground. There are four terminals for selection, and the ground wire is a yellow-green wire. When wiring, the user needs to unscrew the waterproof terminal, then insert the connectornconnection, then tighten the screw to secure the connection, and finally tighten the outer waterproof terminal.
This photovoltaic lightning protection combination box does not require any special maintenance. In order to avoid any failure of the lightning protection module, its operational status must be checked regularly. Especially after thunder and lightning, a quick inspection should be carried out. If you find that the fault indicator light on the panel changes from "green" to "red", please contact the seller or manufacturer in time.
The fuse should be checked regularly to prevent the panel from being in an open circuit state after the fuse blows, and the power of the photovoltaic battery cannot be output;
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The input and output cannot be connected reversely, otherwise the subsequent equipment may not be able to operate normally and may even damage other equipment.ents;
The electrical components installed in the box are specially customized products for photovoltaic lightning protection combination boxes and cannot be mixed with ordinary products. If you need to replace them, please contact the seller or manufacturer. When replacing the fuse core (special DC high voltage core), be careful to prevent high voltage electric shock from photovoltaic solar cells from causing injury to people; /p>
When testing or servicing this equipment, be aware that the input and output may be loaded to prevent electric shock or damage to other equipment;
The wire Input wire should be 4mm2 soft copper wire, and the output wire and ground wire should not be less than 16mm2 soft copper wire.
User units must formulate a management system for protection facilities againstlightning and designate dedicated management staff; Photovoltaic lightning protection combination boxes are electrical products and non-professionals should not dismantle them without authorization.
Case size (8 circuits): 500*412*188, installation size: 438*370
Attached photo (taking 8 circuits as an example):< /p>
Figure 1: Input and output line layout diagram
Input and output line layout diagram of photovoltaic combiner box
The following is the actual view of the patented product:
< p>Actual view of the photovoltaic combiner box p>