The meaning of balance of system (BOS) testing and certification
Balance of system (also referred to as the BOS) refers to all the components of a photovoltaic system except for the photovoltaic panels.
Testing to all applicable balance of system (BOS) standards
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: