MC4 solar extension cable: conductor: copper conductor or tinned copper conductor insulation: radiation crosslinked polyolefin insulation sheath: radiation crosslinked polyolefin insulation ordinary cable: conductor: copper conductor or tinned copper Conductor insulation: polyvinyl chloride or cross-linked polyethylene insulation sheath: polyvinyl chloride sheathed ordinary cable It can be seen from the above that the conductor used is the same as the MC4 solar extension cable. It can be seen from Table 1 that ordinary cable insulation and sheath are different from MC4 solar extension cables. Ordinary cables are only suitable for laying and using in ordinary environments. The advantages of MC4 solar extension cables: high temperature resistance, cold resistance, oil resistance, acid and alkali salt resistance, UV protection, flame retardant, and environmental protection. Photovoltaic power cables are mainly used in harsh environments with a service life of more than 25 years.
Photovoltaic power plants need to determine the cable diameter according to the current value of the string. Distributed power plants use a single string to directly connect the inverter in series. Generally, the current value of a single string does not exceed 9A, and 2.5mm2 or 4mm2 photovoltaic cables are used. .
Centralized photovoltaic power plants generally use centralized inverters, at least 100KW inverters. At this time, the strings will pass through the DC combiner box and then connected to the inverter. At this time, the wire diameter is determined according to the current.
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