Photovoltaic panel surge protection wiring method

Do solar PV systems need surge protection?

Recent changes to the BS7671 UK Wiring Regulations 18th Edition in the form of amendment 2 have introduced requirements and considerations for surge protection on both the AC and DC side of a solar PV System.

What is a surge protection device (SPD) in a PV system?

In order to prot ect electrical equipment, surge pr otection dev ices (SPDs) are provided in the PV system. Fig. 18 shows a ty pical

Where should a surge protection device be installed on a solar inverter?

The Surge Protection device (SPD) protecting the solar inverter must be within 10m of the inverter, if this can't be achieved at the incoming mains/grid supply meterering point or the source of the circuit, then an additional SPD should be installed close to the solar inverter.

What is a DC surge protection device?

Protecting your solar power system is crucial, and a Direct Current (DC) Surge Protection Device (SPD) can play a key role. In this guide, we’ll explore the importance of a DC SPD, discuss its role in a solar system, and provide practical advice on sizing, selecting, and wiring an SPD.

How do you size a solar surge protection device?

You size the surge protection device according to the voltage of your solar array, whether its wired in series or parallel. Let’s say the combined voltage of your solar array is 500VDC; then, you need to get an SPD rated at 500VDC. There are many 1000VDC surge protection devices for sale, but this one would be oversized for your application.

Does SolarEdge provide surge protection?

Overvoltage surge protection requirements depend on the system configuration, physical parameters and geographic location, and should be implemented according to installation requirements. Internal SPDs provided by SolarEdge cannot match the surge protection capabilities provided by external protection devices.