Are you worried that expensive photovoltaic solar systems might be damaged by voltage spikes? The reality is that without surge protection, even the slightest voltage spike can damage your solar panel array and related electronic equipment. Additionally, without lightning protection, your investment in energy efficiency would be pointless since lightning is one of the main causes of solar panel failure. This article provides the ultimate guide to purchasing SPD for solar, helping you provide the best protection for your photovoltaic solar system.
Solar panels are installed outdoors and are directly exposed to harsh conditions such as rain, wind, and dust. Among these weather conditions, lightning strikes require special attention as they can severely impact the safety and performance of the photovoltaic system.
When lightning strikes the ground, it releases energy and affects the electric field on the ground. For photovoltaic solar stations, this brings two main risks:
Direct impact
Lightning can physically damage solar equipment on rooftops.
Transient overvoltage
Cables transmitting through magnetic coupling can cause damage to sensitive components such as printed circuit boards (PCB).
In areas with frequent lightning strikes, unprotected photovoltaic systems will suffer repeated and severe damage, leading to enormous repair and replacement costs, system downtime, and revenue loss. SPD for solar is designed to limit transient overvoltage and divert surge currents to the ground, ensuring the safety of electrical infrastructure and switching equipment.
Since photovoltaic power stations generate direct current (DC) electricity, inverters that convert this power from DC to alternating current (AC) are essential components. Unfortunately, inverters are not only highly sensitive to lightning strikes but also very expensive.
Both AC and DC lines require the correct selection and installation of suitable SPD. The number of SPDs installed in a photovoltaic solar system depends on the distance between the panels and the inverters:
When the cable length between solar panels is less than 10 meters: Install 1 SPD at the inverter, combiner box, or near the solar panels.
When the DC cable exceeds 10 meters: More surge protectors are needed at both the inverter and the solar module end of the cable.
SPD for solar protects the system by controlling transient voltage and redirecting the current back to its source or to the ground when a transient voltage occurs in the protected circuit. The key component is the metal oxide varistor (MOV), which switches between high impedance and low impedance states under different conditions.
At typical operating voltage, SPD for solar remains in a high impedance state and has no effect on the photovoltaic solar system. When a transient voltage occurs in the circuit, SPD switches to a conduction state (or low impedance), redirecting the surge current back to its source or to the ground, keeping the voltage at a safer level. After the transient transfers, SPD automatically resets to a high impedance state.
Photovoltaic solar systems have high DC system voltages up to 1500 volts, requiring specially designed SPDs. Different SPD protections are crucial for the AC and DC sides, with specific DC surge protectors needed for the DC side and AC surge protectors for the AC side. It is dangerous to incorrectly use an AC or DC SPD in case of failure.
In photovoltaic solar applications, SPDs are categorized into three types based on their resistance:
Type 1 SPD: Counters direct strikes that bring energy surges.
Type 2 SPD: Reduces overvoltage from multiple sources.
Type 1+2 SPD: Combines the characteristics of both, providing complete protection.
When choosing a suitable SPD model for a photovoltaic solar system, keep the following points in mind:
Lightning density
System operating temperature
System voltage
System's short circuit current rating
Waveform level to be protected
Nominal discharge current.
By correctly selecting and installing suitable SPD for solar, you can ensure the long-term safety and efficient operation of the photovoltaic solar system.
The Difference Between Surge Protector and Air SwitchJuly 8, 2022Air switches and surge protectors are usually installed in the distribution box of a building, so what is the difference between them? Tiandun Thunderbolt will do a detailed analysis for you.Ⅰ. Surge...viewPower Supply Protection Devices of Smoke and Heat Exhaust Ventilation (SHEV) SystemJune 26, 2024Smoke and heat exhaust ventilation systems (SHEV) play a critical role in enhancing building fire safety by ensuring smoke-free escape routes during a fire and providing residents with more time to es...viewSurge Protector: Safeguarding Your Devices from Power FluctuationsJanuary 5, 2024The Vulnerability of Electronic DevicesIn the digital age, our lives are intricately woven with electronic devices, from smartphones to laptops and everything in between. However, these devices are no...viewThe Surge Protector Will Be Effective 100%?November 28, 2023No surge protector can provide 100% protection against all possible electrical surges or power-related issues. Surge protectors are designed to limit the voltage supplied to an electrical device by ei...viewThe Position of Installing Surge ProtectorMarch 23, 20221. Where to install surge protector？The position of the surge protector: the surge protector is an important component of the lightning protection project in a building, so the location of the surge prote...viewImportant differences between IEC 61643-01:2024 and IEC 61643-11:2011: ---Interpretation of the new standard for surge protectorsDecember 12, 2024The surge protector is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. According to its use, it can be divided into power s...view
EN
jp 
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
ro 
bg 
nl 
