ABSTRACT
The marking and labeling requirements for photovoltaic (PV) systems are included in this book. There are also other marking systems required for energy storage systems in Article 706 Energy Storage Systems and in Article 480 Battery Storage Systems. Modules and ac modules shall be marked in accordance with their listing. Recall that an ac module is, in effect, a microinverter and PV module combined together before testing as a complete ac power-producing unit. The dc wiring, however, is considered as part of the listing and is not subject to the requirements of the National Electrical Code. PV system output circuit conductors shall have the polarity marked when connected to energy storage systems. Self-regulated PV systems have the benefit of not needing a charge controller but have the drawback of not being able to work at the optimal part of the IV curve.
