FAQ
What is a PV DC SPD?
A PV DC SPD is designed to protect the DC side of a photovoltaic system from surge voltage. It is usually installed between the PV strings and inverter, or inside PV combiner boxes.
What information is needed to select PV SPD?
You need to provide PV system voltage, inverter type, combiner box design, grounding system, installation environment, and whether the project has an external lightning protection system.
Can CRESIN provide SPD solutions for 1500V solar PV systems?
Yes. CRESIN can provide PV surge protective devices suitable for high-voltage solar PV systems, including 1000V and 1500V DC applications.
What is the difference between Type 1 and Type 2 PV SPD?
Type 1 PV SPD is used where direct lightning current may enter the system, especially in exposed installations or systems with external lightning protection. Type 2 PV SPD is used to protect against induced surges and is common in most PV applications.
Do solar PV systems need both DC SPD and AC SPD?
Yes. The DC side protects PV strings and inverter DC inputs, while the AC side protects the inverter output and grid-connected distribution system. A complete PV surge protection design usually includes both sides.
What voltage should I choose for solar PV SPD?
The voltage rating should match the maximum DC voltage of the PV system. Common PV SPD voltage ratings include 600V DC, 1000V DC, 1200V DC, and 1500V DC.
Where should SPD be installed in a solar PV system?
SPD is usually installed on the DC side of the inverter, in the PV combiner box, and on the AC output side of the inverter. For larger PV plants, SPD may also be installed in distribution cabinets and monitoring systems.
What is a solar PV surge protective device?
A solar PV surge protective device is designed to protect photovoltaic systems from transient overvoltage caused by lightning strikes, induced surges, or switching operations.
Does DC SPD require grounding?
Yes. DC SPD must be connected to a reliable grounding system to safely discharge surge energy.
Is polarity important when installing DC SPD?
Yes. For many DC SPD products, polarity and wiring direction must be checked carefully during installation. Incorrect wiring may affect protection performance or damage the SPD.
How do I choose DC SPD voltage?
The SPD rated DC voltage should be selected according to the maximum operating voltage of the DC system. For solar PV systems, typical SPD voltage ratings include 600V DC, 1000V DC, 1200V DC, and 1500V DC.
Can AC SPD be used in DC systems?
No. AC SPD should not be used in DC systems unless it is specifically rated and certified for DC applications. Using the wrong SPD may cause safety risks and protection failure.
Where is DC SPD commonly used?
DC SPD is commonly used in solar PV combiner boxes, inverter DC input sides, battery energy storage systems, DC power panels, and low-voltage DC control systems.
How is DC SPD different from AC SPD?
DC SPD is designed for direct current systems where arc extinction is more difficult than in AC systems. Therefore, DC SPD must be selected according to DC voltage, polarity, system configuration, and application conditions.
What is a DC surge protective device?
A DC surge protective device is designed to protect direct current systems from transient overvoltage. It is commonly used in solar PV systems, battery systems, DC control circuits, and other DC power applications.
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The product range includes production technologies for smart capacitors, digital display meters, surge protectors, dedicated backup protection devices for surge protectors, self-resetting over/under-voltage protectors, control and protection switches, and automatic transfer switches for dual power supplies.
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