Cable selection in PV system

The main factors for cable selection in the system are as follows:

Insulation Performance of cables;

Heat-resisting and flame-retardant properties of cables;

The cables are protected against moisture and light;

Cable embedding method;

Cable core type copper core, aluminum core );

Cable Size and specification.

The connection between different components in the PV system varies depending on the environment and requirements. The following lists the technical requirements for different connections.

1. Connection Between Components

UL testing is required to prevent heat from 90 ℃, acid, chemical, moisture and exposure.

2. connection between the internal and the phalanx

It can be open or buried in the ground to prevent moisture and exposure. It is recommended to install the pipe, the catheter must be heat-resistant 90 ℃.

3. Connection Between battery and Inverter

You can use multi-strand soft wires tested by UL or electrical cables tested by UL.

4. The indoor wiring environment is dry)

You can use short DC connections.

Cable Size and specification design must follow the following principles

1. for short-distance connection from a battery to an indoor device, select the rated current of the cable as 1.25 times the calculated continuous current of the cable.

2. For the AC load connection, the rated current of the selected cable is 1.25 times the maximum continuous current of the calculated cable.

3. for inverter connection, the rated current of the selected cable is 1.25 times the maximum continuous current of the calculated cable.

4. For the connection between the square matrix and the square matrix, the rated current of the selected cable is 1.56 times the maximum continuous current of the calculated cable.

5. Consider the effect of temperature on cable performance.

6. Consider that the voltage drop should not exceed 2%.

7. Proper cable ruler diameter selection is based on two factors: current strength and circuit voltage loss. The complete formula is:

Line Loss = Current x circuit Bus length x cable voltage factor

1. Precision Level concept of cable Tester
2. Coaxial Cable and optical fiber cable detection-