Application of photovoltaic DC fuses

As the global energy structure accelerates its transformation to green and low-carbon, photovoltaic power generation, as an important part of renewable energy, has ushered in rapid development. In order to ensure the efficient and safe operation of photovoltaic systems, protection measures on the DC side are particularly critical. Photovoltaic DC fuses came into being in this context and play a vital role in various photovoltaic applications.

Basic functions of photovoltaic DC fuses

The main task of photovoltaic DC fuses is to quickly cut off the circuit when an abnormal overload or short-circuit fault occurs in the DC circuit to prevent the accident from further expanding and protect photovoltaic modules, junction boxes, inverters and back-end equipment from damage.

Unlike traditional AC fuses, photovoltaic special fuses are designed to focus more on the rapid extinction of DC arcs and high current breaking capacity, which can effectively deal with the common high voltage and low current fault characteristics in photovoltaic systems.

Application scenario analysis

1. Photovoltaic module protection

In large ground power stations or distributed rooftop systems, single photovoltaic modules or photovoltaic strings may be abnormal due to manufacturing defects, aging, local shadowing, etc. When a string group fails, the fuse can disconnect the faulty branch immediately to prevent the hot spot effect from further damaging other normal components and ensure stable power generation of the entire array.

2. Combiner box protection

The photovoltaic combiner box is responsible for collecting the current of multiple photovoltaic branches together and is an important node connecting the components and the inverter.

Inside the combiner box, each branch is usually equipped with an independent DC fuse. In this way, when a short circuit occurs in a branch, the fuse can quickly cut off the fault current to prevent the bus from being damaged more widely due to overload.

3. Inverter input protection

As the core device in the photovoltaic system that converts DC power into AC power, the input side of the inverter also needs strict protection. Reasonable configuration of DC fuses can not only protect the internal components of the inverter from high current shock when the system is abnormal, but also effectively extend the service life of the inverter and improve the overall reliability of the system.

4. Energy storage system protection

With the rise of photovoltaic + energy storage projects, DC fuses also play a key role in energy storage systems. Especially between the battery array and the converter, the fuse can prevent high current damage caused by internal faults in the battery pack, adding a solid barrier to the safe operation of the system.

Key points for selecting photovoltaic DC fuses

In practical applications, correct selection is crucial. Generally, the following aspects need to be considered:

- Rated voltage and current: Match the appropriate specifications according to the photovoltaic system design parameters to ensure that the fuse can effectively disconnect the circuit in the event of a fault.

- Breaking capacity: Select products that can withstand the maximum short-circuit current and fuse reliably.

- Environmental adaptability: High temperature resistance, UV resistance, corrosion resistance, adaptability to complex outdoor environments.

- Certification standards: Prefer products that comply with international standards such as IEC and UL to ensure reliable quality.

Although the photovoltaic DC fuse is small in size, it bears important safety protection responsibilities in the entire photovoltaic power generation system. Reasonable configuration and reliable quality can provide strong guarantee for the long-term stable operation of photovoltaic systems.

We focus on providing high-performance, standardized DC fuse products for the photovoltaic industry, and are committed to protecting every degree of green energy with professionalism. If you have more selection or application questions, please feel free to contact us at vickyxu@zhrdq.com, we will provide you with comprehensive and professional solutions.