Due to the unique characteristics of photovoltaic systems, it is necessary to use surge protectors specially designed for photovoltaic systems. To determine how to choose the right surge protector module for your PV system and its installations, you need to know:

1. The operating temperature of the system;

2. The voltage of the system;

3. The rated short-circuit current of the system.

4. Type of lightning strike (direct or indirect)

5. Nominal discharge current

Selection of surge protector on AC side

The surge protector used to protect the AC measurement of photovoltaic systems shall comply with the requirements of IEC 60364-5-53. In particular, it is indicated that the working voltage between the AC transmission line and the ground is due to the technical nature of the inverter power supply, and the sinusoidal AC working voltage is not always standardized. The selection of the surge protector on the AC side should consider the waveform distortion of the working voltage. Significant peaks, commonly referred to as harmonic current effects. Therefore, when selecting an SPD, not only the various main parameters available, but also the SPD with anti-harmonic current effect should be selected.