Tinned copper wire has a silver appearance because tin is a silver metal. The process of tinned copper wire is a little more complicated than that of bare copper wire. At room temperature, tin is very stable in the air, because a dense oxide film will be formed on the surface of tin to prevent the continued oxidation of tin. Therefore, the copper surface is tinned, the first does not affect the resistance, and the second can improve the oxidation resistance of copper to a certain extent.
The purpose of tinning, silver plating (or even gold plating) for wire and cable conductors is to prevent copper wires from being oxidized and blackened at high temperature and humidity, and to improve conductor solderability and reliability. The operating environment of photovoltaic power plants is generally harsh, and they are often installed in deserts, barren mountains, water surfaces, roofs and other environments. It is required that the resistivity of photovoltaic cables must be good, not easy to oxidize, and can be used for a long time. Therefore, tinned copper wire is selected as the conductor will best fits the use environment and has the most stable electrical performance.
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