Solar connector related performance and precautions

 Solar connector related performance and precautions

With the wide application of photovoltaic power generation, the international standard MC4/H4 connectors are widely used for the connection between photovoltaic modules and module strings, dc terminal connection of bus box, inverter and other equipment

1. Performance requirements of photovoltaic connectors

So what are the performance requirements of photovoltaic connectors?

First, the photovoltaic connector should conduct well, and the contact resistance should not be greater than 0.35 milliohms.

Second, it is necessary to have enough safety performance to ensure the safety performance of solar cell modules. The environment and climate of solar equipment are sometimes in very bad weather and environment, so it should be waterproof, high-temperature resistant, corrosion resistant, high insulation and other properties, and the protection grade should reach IP68.

Third, the solar connector structure should be firm and reliable, the correct insertion of male and female connectors, the connection relay of the two should not be less than 80N. For MC4 connectors connected to 4mm² cables, the temperature shall not exceed 105 ° c when carrying 39A current. MC4/H4 connector is a single core connector, which is divided into male and female heads. It has many advantages, such as good sealing, convenient connecting and inserting, convenient maintenance and so on.

2, photovoltaic connector installation matters needing attention

The purchase of plug should pay attention to the quality of the product, including the size of the internal metal conductor compliance, material thickness, elasticity and coating should meet the ability to carry large current and good contact, plug shell plastic to ensure that the surface is smooth without cracks, good interface sealing. When installing component connectors, avoid exposure to sunlight and rain to avoid aging of connectors, corrosion of internal connectors, and cables, increase of contact resistance, and even ignition, which may reduce system efficiency or cause fire.

The installation of photovoltaic connectors, crimping link is the most important, should use professional crimping tools. Before the construction of photovoltaic power station, relevant engineering installation personnel should be trained on crimping operation.

Component connectors, connector plugins connected to bus boxes and cluster inverters are trouble spots. Although the connector is small, it is very important in the photovoltaic power generation system, especially in the operation and maintenance process after the completion of the power station, we should pay attention to its operation state, and check the connection plug heating phenomenon regularly to ensure that there is no abnormality and normal work.