Solar photovoltaic fuse: the "safety guard" guarding the photovoltaic system

With the popularization of solar photovoltaic power generation technology, more and more families and enterprises have begun to use photovoltaic systems to generate electricity. However, photovoltaic systems may encounter electrical faults such as overload and short circuit during operation. These faults will not only affect the power generation efficiency, but also may cause safety accidents. At this time, solar photovoltaic fuses have become a key device to protect the safety of the system. So, what is a solar photovoltaic fuse? How does it work?

What is a solar photovoltaic fuse?

CNLonQcom's LQPV series of solar photovoltaic fuses is an electrical protection device specially designed for photovoltaic systems, mainly used in DC circuits. Its core function is to quickly cut off the current when an overload or short circuit occurs in the circuit, thereby protecting photovoltaic components, inverters, cables and other equipment from damage.

The operating voltage of photovoltaic systems is usually high (up to 1000V or more), and the characteristics of direct current make it more difficult to cut off the fault current. Therefore, ordinary fuses cannot meet the needs of photovoltaic systems, and photovoltaic fuses are specially designed for these characteristics. LQPV photovoltaic fuse holder can reach 1500V

Working principle of photovoltaic fuse

The core component of LQPV photovoltaic fuse is the fuse: it is made of special materials and can quickly melt when the current exceeds the rated value. Its exterior is made of ceramic, which has good stability, excellent insulator, can effectively prevent current leakage and short circuit, and is not easy to deform or melt. Provide reliable insulation protection in high voltage applications.

Its working principle is as follows:

1. During normal operation: the current is within the rated range, the fuse is in the on state, and the system operates normally.

2. When overloaded or short-circuited: when the current exceeds the rated value of the fuse (such as due to component failure or line short circuit), the fuse will melt due to overheating, thereby cutting off the circuit.

3. After troubleshooting: a new fuse needs to be replaced before the system can resume normal operation.

The photovoltaic fuse has a very fast action speed and can cut off the fault current within milliseconds, thereby minimizing damage to the system.

Application Scenarios of Photovoltaic Fuses

Photovoltaic fuses play the role of "safety guards" in photovoltaic systems and are mainly used in the following scenarios:

1. Protection of photovoltaic modules

Photovoltaic modules are the core of the system, but current abnormalities may occur due to shadows, dust or damage. Fuses can prevent modules from overloading or short-circuiting.

2. Protection of inverters

The inverter is the "heart" of the photovoltaic system and is responsible for converting direct current into alternating current. Fuses can protect the input side of the inverter from overcurrent damage.

3. Protection of energy storage batteries

If the photovoltaic system is equipped with energy storage batteries, fuses can prevent the batteries from being damaged by overcharging or short-circuiting.

4. Protection of DC combiner boxes

In large photovoltaic power stations, DC combiner boxes are used to collect currents from multiple strings. Fuses can protect combiner boxes and their downstream equipment.

Characteristics of photovoltaic fuses

Compared with ordinary fuses, photovoltaic fuses have the following unique characteristics:

1. High rated voltage

The working voltage of photovoltaic systems is relatively high, so the rated voltage of photovoltaic fuses is usually 1000V or 1500V, which can adapt to high-voltage environments.

2. High breaking capacity

When the photovoltaic system is short-circuited, a large fault current may be generated, and photovoltaic fuses can safely cut off these large currents.

3. Strong weather resistance

Photovoltaic systems are usually installed outdoors, and fuses need to be able to withstand harsh environments such as high temperature, low temperature, and humidity.

4. Low power consumption design

Photovoltaic fuses have extremely low power consumption during normal operation and will not affect the power generation efficiency of the system.

Solar photovoltaic fuses are an indispensable protection device in photovoltaic systems. It ensures the safe operation of the system by quickly cutting off the fault current. With the continuous development of photovoltaic technology, the performance of fuses is also constantly improving. CNLonQcom will also continue to innovate and develop new products to provide more reliable guarantees for the popularization of clean energy.

Let us embrace green energy and protect a better future!