The cables used in the low-voltage DC transmission part of the photovoltaic power generation system have different requirements for the connection of different components due to different use environments and technical requirements. The overall factors to be considered are the insulation performance of the cable, the heat-resistant and flame-retardant performance, and the Aging performance and wire diameter specifications, etc. Specific requirements are as follows:
1. The connecting cable between the solar cell module and the module is generally connected directly with the connecting cable attached to the module junction box. When the length is not enough, a special extension cable can also be used. Depending on the power of the components, this type of connecting cable has three specifications with a cross-sectional area of 2.5mm2, 4mm2, and 6mm2. This type of connecting cable uses a double-layer insulation sheath, which has excellent resistance to ultraviolet rays, water, ozone, acid, and salt.
2. The connecting cable between the battery and the inverter requires the use of a multi-strand flexible wire that has passed the UL test, and it should be connected as close as possible. The rated current of the connecting cable of the inverter is 1.25 times the maximum continuous current in the calculated cable. Choosing short and thick cables can reduce the loss of the system, improve efficiency, and enhance reliability.
3. The connecting cables between the battery array and the controller or DC junction box also require the use of multi-strand flexible wires that have passed the UL test. The cross-sectional area specification is determined by the maximum current output of the square array. The rated current of the cables connected inside the square matrix and between the square matrix is 1.56 times the maximum continuous current in the calculated cable.
4. For the short-distance DC connection between the battery and the indoor equipment, the rated current of the cable is selected to be 1.25 times the connected current of the cable.
The characteristics that photovoltaic cables should have can be applied to photovoltaic power plants in different environments to ensure their long-term safe operation. Correctly selecting suitable cables for different parts can maximize the stability of the system on the basis of stable costs and ensure the good power station Long-term operational benefits.
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