When it comes to inverters, many people care about its conversion efficiency. This is very important. At the same time, it is also determined by many factors. Wire is one factor. When choosing copper wires, pay attention to these points:
The first point: color
At present, a lot of copper on the market basically contains impurities. The more impurities contained, the worse the conductivity of the conductor. The amount of impurities contained in the conductor will generally be reflected in the color.
The color of the best quality copper is reddish, purple, purplish red, dark red.
The worse the copper, the lighter the color and the more yellow it is. Some copper is light yellow-the impurity content of this copper is very high.
Some of them are white. This is a very high-grade wire. The copper wire is plated with a layer of tin. The main reason is to prevent the copper from oxidizing to form patina. The conductivity of patina is very poor, which will increase resistance and increase heat dissipation; it can be improved Conductivity, improve wire performance. At the same time, tinning the copper wire can also prevent the insulating rubber from sticking, the core of the wire will become black and brittle, and improve its solderability. DC cables are basically tinned copper wires.
The second point: thickness
When the wire diameter is the same, the thicker the conductor, the stronger the conductivity-when comparing the thickness, only compare the conductor and add the thickness of the insulating layer.
Try to use multiple strands of flexible wire, and there is only one core wire in a cable, which is called a single core wire. There are multiple core wires in a cable, which is called multi-core wire; each core wire is composed of multiple copper wires and is called multi-strand wire, which is relatively soft and suitable for photovoltaic systems. The single-stranded wire can be directly crimped on the terminal, but the single-stranded wire is relatively hard and is not suitable for installation in places with a small turning radius.