In the household photovoltaic system, you may often encounter a choice question: photovoltaic modules, inverters and grid connection switches should be connected by cables. Is it cheaper to use aluminum cables or expensive copper cables? Today we will talk about this problem.
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Compared with copper wire, aluminum wire connection is more dangerous due to the following reasons:
1. Copper aluminum joints are prone to electrochemical corrosion;
2. The surface of aluminum wire is easy to be oxidized in air;
3. Easily corroded by hydrogen chloride;
4. High expansion coefficient;
In addition, copper has absolute advantages over aluminum in conductor performance. The conductivity of aluminum is only about 60% of that of copper conductor, and that of aluminum alloy conductor is even worse;
In terms of oxidation and corrosion resistance, the chemical property of aluminum is much more active than that of copper, so the oxidation and corrosion resistance of aluminum conductor is much worse than that of copper conductor, and the fire probability of aluminum conductor is about 10 times that of copper conductor;
From the perspective of thermal expansion, the linear expansion coefficient of aluminum conductor is far greater than that of copper conductor, and the use of aluminum questions will lead to poor contact after thermal expansion and cold contraction, or even accidents such as loose contact, oxidation and heating, and will lead to a vicious cycle;
Although it is much cheaper to use aluminum cable than copper cable from the perspective of initial cost, we need to consider that the service life of household photovoltaic power station is more than 25 years. From the perspective of reducing power consumption, ensuring the safety of life and property of friends, and extending the service life of household photovoltaic system, we strongly recommend to use dedicated PV cable
