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 Solutions’ 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:
- UL Subject 248-19 and UL Subject 2579 for fuses
- UL 98B and UL 508I for disconnects
- UL 489B circuit breakers
- UL Subject 4248-18 and UL Subject 4248-19 for fuse holders
- UL 1741, the Standard for combiner boxes
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