SBOA618 December   2025 TMCS1126

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Current Ratings and Thermal
    1. 2.1 Current Ratings
    2. 2.2 Effects of PCB and Layout
  6. 3Accuracy
  7. 4Bandwidth, Response Time and Propagation Delay
    1. 4.1 Bandwidth
    2. 4.2 Response Time
    3. 4.3 Propagation Delay
  8. 5Lightning and Surge
    1. 5.1 Knowing Lighting and SPD in Solar
    2. 5.2 Understanding IEC 61643-32
    3. 5.3 Understanding IEC 61643-11
    4. 5.4 Surge Requirements in Solar Systems
    5. 5.5 Challenges and Designs for In-Package Hall Sensor
  9. 6Isolation and Reliability
  10. 7Summary
  11. 8References

5.2 Understanding IEC 61643-32

IEC 61643-32 (Low-voltage surge protective devices - Part 32: Surge protective devices connected to the DC side of photovoltaic installations - Selection and application principles) describes the principles for selection, installation and coordination of SPDs intended for use in Photovoltaic (PV) systems up to 1500 VDC and for the AC side of the PV system rated up to 1000 Vrms 50/60 Hz.

There are mainly three types of PV and corresponding SPD installation. Figure 5-2 shows one example of the installation of SPDs in the case of a building without external LPS (Lightning Protection System). Table 5-1 summarizes requirements for the three different installations from IEC 61643-32.

Installation of SPDs in the Case of a Building without External LPSFigure 5-2 Installation of SPDs in the Case of a Building without External LPS
Table 5-1 Summary from IEC 61643-32:2017 to Select the Right SPD Class
Installation LocationMain DistributionAC Side of Inverter (Cable Length to Main Distribution ≥10 m)DC Side of Inverter (Cable Length to PV Panels ≥10 m)Near PV Panels or Entrance to the Building
PV installation without external LPSClass I or II SPDClass II SPDClass II SPDClass II SPD
PV installation with external LPS, separation distance is keptClass I SPDClass II SPDClass II SPDClass II SPD
PV installation with external LPS, separation distance is not keptClass I SPDClass I SPDClass I SPDClass I SPD