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How to decide the AC cable size for the solar system?

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Like what would be the size of 4 core aluminum cable of apx 50 M for a 15 kW system ?

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AC cable size is dependent on the total connected load that means its current carrying capacity which is decided by its number of cores and cross section area and length of cable. For above system 16 sq mm wire is recommended. The basic formula is: Wire current rating= max current x 1.56

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