Balance of System (BOS) refers to the electrical components of a PV system other than the solar modules and major equipment such as inverters and medium voltage transformers. Traditionally, these components consist of cables/wires, switches, grounding and power connectors, cable management solutions, as well as the software that integrate the entire system together. It also includes the combiner boxes and disconnect enclosures. Essentially, BOS describes all parts of the system that work together to bring the DC power produced by the solar modules to the inverter.

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