What Is A Rapid Shutdown Device?
A Rapid Shutdown Device is a critical component in solar power systems designed to quickly and safely shut down the electrical output of a solar array. Its primary purpose is to enhance the safety of solar installations, especially in emergency situations or when maintenance work is required.
The device is typically used in photovoltaic systems and is responsible for rapidly de-energizing the solar panels to mitigate electrical hazards. This is particularly important during emergencies such as fires, where a swift shutdown can help reduce the risk of electrical shock for first responders and ensure the safety of individuals and property.
The functionality of a Rapid Shutdown Device is often integrated into solar inverters or implemented as a separate device within the solar array. It adheres to relevant safety standards and regulations, and its use is crucial for compliance with electrical and building codes in many jurisdictions.
What Are the Key Components Of A Rapid Shutdown System?
Rapid Shutdown Device (RSD)
The RSD is a type of Module-Level Power Electronics (MLPE) or microinverter installed on the backside of solar panels. Equipped with technology capable of rapidly shutting down and reducing the voltage output of the entire solar system, it complies with photovoltaic rapid shutdown regulations. An example is the Tigo TS4-A-F or 2F, which is one of our MLPEs that specifically adheres to rapid shutdown requirements. Tigo offers various MLPE options compliant with rapid shutdown regulations.
Initiator
The role of a Rapid Shutdown Initiator is just as its name implies. This device typically exists in the form of an emergency stop (e-stop) button within the inverter. Rapid shutdown can usually be initiated in two ways: manually (via an electronic stop button) or automatically (from the loss of power from the grid).
Inverter
Within the rapid shutdown system, you’ll need an inverter. The inverter is a device that converts the electricity generated by solar panels into usable energy for your home (for more information on this process, please refer to our previous blog posts). Many rapid shutdown initiators are housed within inverters.
These three components are known as Photovoltaic Rapid Shutdown Equipment (PVRSE). They are devices used within rapid shutdown systems to lower voltage to safe levels. National Electrical Code regulations in the United States stipulate that PVRSE and PVRSS must be UL-certified to achieve the purpose of rapid shutdown.
Why Is The RSD So Important?
Rapid shutdown provides a secure method for firefighters or solar installation personnel to stop or reduce the voltage and current from a photovoltaic (PV) array, allowing them to work safely and effectively, avoiding electrical hazards. Shutting down or reducing the voltage at the module level on the roof minimizes or eliminates the risk of electric shock for firefighters, which may result from high voltages associated with solar modules.
Top 10 Rapid Shutdown Device Suppliers
Here are the leading companies in the RSD market:
ABB
ABB is a technology leader in electrification and automation, enabling a more sustainable and resource-efficient future. The company’s solutions connect engineering know-how and software to optimize how things are manufactured, moved, powered and operated.
APsystems
APsystems’s module-level shutdown products are the ideal PV fire safety solution, meeting the relevant requirements of the Technical Specification for Home Rooftop Photovoltaic Power Supply Connection to the Grid. ReneSola’s module-level switch RSDs are used in conjunction with the Transmitter signal generator, so that when the system encounters an emergency situation, the Transmitter can be stopped by pulling the AC gate, thus disconnecting the output of each module and safeguarding the system. Their strengths are their safety and reliability, and their ASIC integration technology.
Tigo Energy
Tigo Energy, the worldwide leader in Flex MLPE (Module Level Power Electronics), designs innovative solar power conversion and storage products that provide customers with more choice and flexibility. The Tigo TS4 platform increases solar production, decreases operating costs, and enhances safety.
Fronius
The Fronius Rapid Shutdown Box Duo and Quattro generation has been specially developed for the demands of the North American market and is a reliable, easy-to-install solution for quickly disabling PV generators. Compliant with NEC 2014 (690.12), the Rapid Shutdown Box is suitable for all North American SnapINverters up to a maximum system voltage of 600 V.
OutBack Power
OutBack Power offers a variety of reliable PV rapid shutdown devices, supporting the safety and performance of solar energy systems.
HIITIO New Energy Co., Ltd
HIITIO is a first-tier manufacturer located in Hangzhou, China, dedicated to providing you with cutting-edge solar solutions. Our mission is to drive the development of clean energy by focusing on innovation, quality, and reliability.
HIITIO component-level photovoltaic shutdown has the component-level rapid shutdown function, and upon the rapid shutdown mechanism is triggered, the voltage between any two points of the system will not exceed 80V within 30s, and this meets NEC 2017 690.12 standard. This scheme is based on power line carrier communication.
Ginlong (Solis) Technologies
Solis’s Rapid Shutdown Devices are certified to the UL 1741 PV inverter standard and comply with all 2014 National Electrical Code 690.2 Rapid Shutdown requirements. As one of the world’s top three manufacturers of photovoltaic inverters, they are also known for their rapid shutdown devices.
Hoymiles
Hoymiles is a global MLPE (Module Level Power Electronics) solution provider, specializing in module-level products and storage systems. With a vision of a clean, sustainable future, they strive to lead the smart energy industry through our rugged technology and reliable products.
Beny Electric
Beny is a leading manufacturer of fast shut-offs in China, and their pioneering solar shut-off solutions provide a high-quality customer experience.
GoodWe
The Rapid Shutdown (RSD) Receiver from GoodWe is a key component of the RSD 2.0 solution for PV systems and can be connected with one or two modules. Functioning as a module-level rapid shutdown device, it enhances fire safety for solar rooftops and buildings.
The Receiver ensures the normal operation of modules by consistently receiving a PLC keep-alive signal from a transmitter integrated into GoodWe’s inverters or an external transmitter. During emergencies, the module-level rapid shutdown is activated when the transmitter loses power and the signal becomes absent. In addition, when the external RSD initiator is pressed, the modules can also be shut down.
Bottom Line
Rapid Shutdown Devices (RSDs) are critical for ensuring the safety of solar power systems. The top 10 manufacturers listed in the document offer innovative solutions that comply with safety regulations. To find the right RSD solution for your solar installation needs, contact us today for inquiries. Let us help you enhance the safety and efficiency of your solar system.
