Rapid Shutdown Devices: Indispensable Safety Solutions for Photovoltaic Systems

Amidst the continuous expansion of photovoltaic systems’ applications and scale, safety remains of paramount importance. Reports indicate that the majority of accidents in photovoltaic systems are fire-related, with 80% of these fires being caused by direct current (DC) arcs generated by high DC voltages. When problems arise, they can result in immeasurable losses in terms of both human life and property. Therefore, the rapid shutdown of high DC voltage sources within photovoltaic systems has become an indispensable requirement, ensuring the safety of personnel and the systems themselves.

In traditional photovoltaic systems, multiple solar panels are connected in series, allowing voltages to add up, potentially reaching up to 1500V, which is considered high DC voltage. With increased operating time, system components may experience failures, insulation aging, loose electrical connections, and other issues. These problems can lead to poor electrical contact, damaged insulation materials, reduced insulation impedance, and an increased risk of DC arc faults, thereby elevating the risks of fire and electric shock. In response to these challenges, the National Electrical Code (NEC) introduced requirements for rapid shutdown of photovoltaic systems as early as 2014, with even stricter requirements presented in the 2020 NEC edition. The new standards mandate that photovoltaic systems must be equipped with a “Photovoltaic Hazard Control System,” enabling controlled shutdown in critical situations and achieving component-level shutdown. The control system is required to reduce voltages within the boundary range to below 80V within 30 seconds after activation.

Traditional disconnect methods often involve complex and time-consuming procedures, leading to unnecessary risks. However, Rapid Shutdown Devices offer a solution that is both swift and reliable, fundamentally transforming the landscape. As the name suggests, photovoltaic Rapid Shutdown Devices can swiftly and safely interrupt the flow of electricity within solar panel arrays or circuits. Their primary advantage lies in enhancing the reliability and safety of photovoltaic systems while providing a secure working environment for installation and maintenance personnel.

Drawing upon 30 years of practical experience in the electrical industry, BENY offers secure and reliable rapid shutdown solutions to customers. BFS-21 can operate a single standard PV module or two modules while BFS-22 is capable of operating not just one, but two standard PV modules or up to four modules. This not only reduces equipment costs but also enhances system design flexibility. These devices are capable of reducing voltages to safe levels within microseconds and employ Power Line Communication (PLC) technology to swiftly transmit abnormal signals during emergencies or maintenance operations. Additionally, they feature proactive measures such as automatic component-level shutdown in cases of over-temperature or alternating current power loss, effectively preventing system overheating and reducing the risks of damage or failure. By monitoring system temperature and operational status, they can safeguard your investments, ensuring that your solar system operates stably and efficiently over the long term. Both BFS-21 and BFS-22 have obtained certifications from authoritative bodies such as SUNSPEC, UL, and NEC, attesting to their outstanding quality and performance. Moreover, by simplifying installation processes, they are more user-friendly and help users to save time and effort.

In summary, photovoltaic rapid shutdown devices play a pivotal role in ensuring the safety and reliability of solar energy systems. They offer a swift means of cutting off power in emergency situations and find extensive applications, making them an indispensable component for creating safer photovoltaic systems. BENY is dedicated to safety, reliability, and innovation, providing cutting-edge safety solutions that contribute to the development of photovoltaic systems and a sustainable future.