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Solar Balance of System Certification

UL provides balance of system (BOS) equipment certification for fuses, holders, combiner boxes and end products such as meters.

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Balance of system

Example of cable managementBalance of system (also referred to as the BOS) refers to all the components of a photovoltaic system except for the photovoltaic panels.

UL’s balance of system (BOS) equipment certification helps you evaluate fuses, holders, combiner boxes and end products such as meters. We test and, if applicable, certify BOS to: 

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