How to safeguard Solar Energy Systems with Firefighter Safety Switches?

A photovoltaic power system is a renewable energy generation system that harnesses solar energy for electricity production. With the continuous development of photovoltaic technology, the scale of photovoltaic power systems is increasing, along with higher grid capacities. However, photovoltaic power systems pose certain safety risks, such as Direct Current (DC) high voltage and fire hazards. In the solar energy system, the firefighter safety switch (also known as the string-level shutdown device) serves as a critical safety protection device. Its intelligence, rapid response, and high reliability make it an indispensable component in ensuring the secure operation of the system, effectively preventing safety incidents. This article explores the working principles, significance, features, and applications of the rapid shutdown switch for solar PV system, aiming to provide a better understanding of this key technology in the renewable energy sector.

How does it works?

At the core of the PV firefighter safety switch lies its advanced electronic components and intelligent control technology. Typically installed at the output end of solar panels, it operates by swiftly disconnecting the DC side of solar arrays from the current flowing towards the inverter system in the event of alternating current faults in the power grid or elevated system temperatures. This action is taken to prevent the occurrence of electric shock and fire incidents.

Why is it important?

Installing a rapid shutdown switch in a photovoltaic system effectively enhances safety, with specific advantages in the following areas:

Fire prevention: In solar energy systems, issues like cable aging and loose connections may lead to circuit overheating and, in extreme cases, fires. The firefighter safety switch, by monitoring system faults and temperature, promptly cuts off the circuit, preventing fires caused by circuit faults.

Personal safety assurance: Abnormal operation of a photovoltaic system can pose threats to personal safety, such as electric shocks and fires. The firefighter safety switch can promptly cut off the circuit, reducing harm to individuals in case of accidents.

Equipment protection: Various devices in a photovoltaic system require stable current and voltage. Excessive or insufficient current and voltage can damage equipment. The firefighter safety switch protects the electrical equipment in the photovoltaic system, extending the lifespan of the equipment.

What are the key features of the switch?

Intelligent: The firefighter safety switch employs advanced electronic components and intelligent control technology, enabling automatic system monitoring. This enhances the intelligence of fault detection and disconnection functions.

Rapid response: In the presence of abnormal conditions, the firefighter safety switch swiftly responds, achieving millisecond-level circuit disconnection. This ensures timely control of incidents, reducing the likelihood of safety accidents.

High reliability: By using reliable electrical components and undergoing rigorous quality testing, the firefighter safety switch exhibits high reliability and stability, adapting to various complex working environments.

Where are they applied and what should we pay attention to?

The firefighter safety switch is primarily used on the DC side of photovoltaic power systems and can be installed at the output end of each solar string to enhance the safety. When selecting a firefighter safety switch, the following factors should be considered:

Current and voltage requirements: Ensure that the chosen firefighter safety switch meets the current and voltage requirements of the photovoltaic system. The current and voltage characteristics of the system may vary based on scale, design, and installation methods.

Trigger thresholds: Setting the trigger thresholds for the firefighter safety switch is crucial. These thresholds should be determined based on the characteristics and design parameters of the system to ensure timely triggering of the switch in case of abnormal situations, protecting the system from damage.

Fast response time: Choose a switch with a fast response time to ensure quick circuit disconnection when abnormalities are detected. Millisecond-level response times reduce the risk of potential accidents.

Environmental adaptability: Consider the environmental conditions in which the photovoltaic system operates, such as temperature, humidity, and pollutants. Select a switch that is highly adaptable and can reliably operate in various environmental conditions, ensuring product reliability and stability.

How can Beny’s solutions benefit you?

The Beny BFS-S series firefighter safety switch is a DC solution that ensures the safety and reliability of photovoltaic systems, designed specifically to protect rooftop solar energy systems. It features:

Plug and Play: Adopts MC4 cables for easier installation.

Rapid Shutdown: Simultaneously connects to 1 to 4 solar panel strings and achieve rapid shutdown; compatible with system voltages up to 1500VDC and 50A current per string.

Active Response: Swiftly responds and automatically disconnects in case of AC power loss or a system temperature exceeding 85°C.

Manual Shutdown: Can be paired with a button switch for manual shutdown, creating a safe environment for system maintenance.

Strong Environmental Adaptability: IP66 protection rating with a breathing valve-equipped aluminum enclosure guarantees stable operation in harsh environments.

Industry Certified: Recognized by global authorities such as TUV Rheinland and CE; its internal isolator switch is UL and RoHS certified, ensuring quality, safety, and performance.

Long Service Life: Uses flame-retardant and UV-resistant materials to ensure stability and longevity.

The firefighter safety switch is a crucial means of safety protection for photovoltaic power systems, playing an irreplaceable role in ensuring the safe operation. Its features of intelligence, rapid response, and high reliability make it a safety assurance device in solar energy systems. In future solar energy applications, Beny will emphasize the research and application of firefighter safety switches to ensure the safe, reliable, and efficient operation of solar energy systems. Through continuous technological innovation and the accumulation of practical experience, Beny aims to develop more intelligent and superior photovoltaic components, promoting the global application of photovoltaic systems.

Contact for more information: info@beny.com