First, the choice of cable in the photovoltaic system mainly consider the following factors:
1, the insulation properties of the cable;
2, heat-resistant cable flame retardant properties;
3, moisture-proof cable, light;
4, laying the cable;
5, the type of cable core (copper, aluminum);
6, the size of the cable specifications.
Second, the connection between different components in the photovoltaic system, due to the different requirements of the environment, the choice of the cable is not the same. The following lists the technical requirements for different connections:
1) Connection between components and components
UL testing must be carried out, heat-resistant 90 ℃, anti-acid, anti-chemical substances, moisture-proof, anti-exposure.
2) Wiring between battery and inverter
You can use multiple strands that pass the UL test, or use a welder cable that passes the UL test.
3) inside the square and the square between the connection
Can be open-air or buried in the ground, requiring moisture-proof, anti-exposure. It is recommended to wear tube installation, the catheter must be heat 90 ℃.
4) Indoor wiring (dry environment)
You can use a shorter DC link.
Third, the cable size specification design, must follow the following principles:
1) Battery to indoor equipment short-distance DC connection, select the cable rated current 1.25 times the continuous current calculation cable.
2) The connection between the square matrix and the square matrix, the selected cable rated current calculated cable maximum continuous current of 1.56 times.
3) AC load connection, select the cable rated current calculated cable maximum continuous current of 1.25 times.
4) Inverter connection, select the cable rated current calculated cable maximum continuous current of 1.25 times.
5) Consider the effect of temperature on the performance of the cable.
6) Consider the voltage drop not more than 2%.
7) The appropriate cable size selection based on two factors, the current strength and circuit voltage loss. The formula is:
Line Loss = Current × Circuit Bus Length × Cable Voltage Factor (available from cable manufacturer)
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