PV system cable selection

Update date:2018-06-19 Source:MAXGE

 The design method of cable selection in photovoltaic system covers the factors that should be taken into consideration when selecting cables in the photovoltaic system, how to select suitable cables in different environments, and the principles that cable size specifications should follow.

PV system

1. The selection of cables in the photovoltaic system mainly considers the following factors:

a. The insulation performance of the cable;

b. Heat and flame resistance of the cable;

c. Cable moisture, light protection;

d. laying of the cable;

e. type of cable core (copper core, aluminum core);

f. The size of the cable.

photovoltaic system

2. The cable size specification design must follow the following principles:

a. Short-distance DC connection of storage battery to indoor equipment, the rated current of the selected cable is calculated as 1.25 times of the continuous current of the cable.

b. The connection between the inside of the square matrix and the square array, the selected cable rated current is 1.56 times the maximum continuous current in the calculated cable.

c. AC load connection, the selected cable rated current is 1.25 times the maximum continuous current in the calculated cable.

d. Inverter connection. The rated current of the selected cable is 1.25 times the maximum continuous current in the calculated cable.

e. Consider the effect of temperature on the performance of the cable.

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

g. The selection of the appropriate cable diameter is based on two factors, current strength and circuit voltage loss. The formula is:

Line loss = current × circuit bus length × cable voltage factor.

PV system cable

The DC cables in the photovoltaic power generation system are laid outside for me. The connection method is mainly based on joints.

With the development of solar power, the corresponding transmission and distribution lines also radiate to every corner. How to reasonably and effectively select cables, reduce construction costs, and improve the company's core competitiveness have become increasingly concerned and valued by engineering companies. A big issue.


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