PV inverter common faults and treatment methods

Update date:2018-05-15 Source:MAXGE

PV inverter common faults and treatment methods

Photovoltaic inverter common faults and treatment methods

1. Low insulation resistance: Use exclusion method. Unplug all the strings on the input side of the inverter, and then connect them one by one. Use the function of the inverter to detect the insulation resistance, detect the problem strings, and then check whether the DC connectors have flooding short-circuit brackets after finding the problem strings. Alternatively, the shorting brackets can be melted and the components themselves can be checked to see if the components themselves have black spots burned at the edges and the components leak to the ground through the frame.


2. The bus voltage is low: If it is in the early/late hours, it is a normal problem because the inverter is trying to limit the power generation conditions. If it is in the normal daytime, the detection method is still the exclusion method, and the detection method is the same as the 1 item.


3. Leakage current failure: The root cause of this type of problem is the installation quality problem, which is caused by the wrong installation location and low quality equipment. There are many points of failure: low-quality DC connectors, low-quality components, unsatisfactory installation height of components, low quality of grid-connected equipment, or leakage of incoming water. Once similar problems occur, you can find out the Good insulation work to solve the problem, if it is the material of this province can only replace the material.

4, DC overvoltage protection: With the pursuit of high-efficiency process improvement of the components, the power level constantly updated and rising, while the component open circuit voltage and operating voltage are also rising, the temperature coefficient must be considered in the design phase, to avoid overpressure caused by low temperature equipment hard damage.


5. The inverter does not respond to power on: Make sure that the DC input circuit is not reversed. Generally, the DC connector has a fool-proof effect. However, the crimping terminal has no foolproof effect. Read the inverter instructions carefully to ensure that the positive and negative terminals are crimped. very important. Inverter built-in reverse short-circuit protection, normal start after restoring normal wiring.

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