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 around the edges 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 the choice of apoor installation 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 affectingcause damage to the 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.