The cable size (square) required for a photovoltaic project mainly depends on the scale of the project, current requirements, cable length, and the material and type of cable selected.

In photovoltaic projects, common cable types include photovoltaic DC cables and AC cables. Photovoltaic DC cables are mostly laid under harsh outdoor conditions, and need to have certain moisture, high temperature, anti-freeze, anti-ultraviolet and other characteristics. Common photovoltaic DC cable specifications are 4 square, 6 square and 8 square. Among them, the 4 square cable is one of the commonly used specifications, but with the increase of the photovoltaic module current and the increase of the power of a single inverter, the application of 6 square and 8 square cables is also increasing.

For AC cables, the commonly used models are BVR and YJV, etc. When selecting specifications, attention should be paid to the voltage level, temperature level and whether the cable is flame retardant. Cable specifications are generally expressed by the number of cores, nominal cross section and voltage level.

Please note that the above is only a general recommendation, the actual cable size selection needs to be calculated and determined according to the specific needs of the project, the relevant PV system designer or cable supplier is recommended to obtain accurate information. In addition, considering the loss of the cable during use, it is recommended to choose a slightly larger cable specification to leave a certain amount of redundancy space to ensure the stable operation of the system.

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