Solar PV Surge Protection
Photovoltaic systems are usually installed in open outdoor environments such as rooftops, solar farms, industrial parks and remote power stations. Long DC cable runs, exposed PV arrays and outdoor inverter equipment make the system highly vulnerable to lightning-induced surges and switching transients. A complete PV surge protection design should consider both the DC side and AC side of the system. CRESIN offers DC surge protective devices for PV strings and combiner boxes, as well as AC surge protection for inverter output and low-voltage distribution systems.
String / Combiner box input
For the PV DC side, select a Type 2 (T2) SPD rated at DC 600, 1000, 1200, or 1500 V, depending on the system voltage.
PV DC SPD->DC Power SPD
Un(V) :
DC600V/1000V/1200V/1500V
Uc(V) :
DC670V/1200V/1500V/1800V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Reference Standards:
IEC 61643-31OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingInverter DC input
Suppress DC surges between the modules and the inverter.
PV DC SPD->DC Power SPD
Un(V) :
DC600V/1000V/1200V/1500V
Uc(V) :
DC670V/1200V/1500V/1800V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Reference Standards:
IEC 61643-31OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingInverter AC output / AC combiner cabinet
AC secondary protection; protects low-voltage equipment on the grid-connected side.
PV AC SPD->Type 2 / Class ll
Uc(V):
AC385V/760V/1100V/1500V
Poles:
2P,3P,3P+1(Series connection),4P
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingLow-voltage side of box-type transformer / step-up station
AC primary protection; located at the boundary between LPZ0B and LPZ1.
PV AC SPD->Type 2 / Class ll
Uc(V):
AC385V/760V/1100V/1500V
Poles:
2P,3P,3P+1(Series connection),4P
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingSurveillance camera / weather station / communication cabinet
Protects Ethernet and 24V/analog signal lines, respectively.
CCTV & Security SPD
Uc(V) :
DC40V/AC320V
Un(V) :
DC24V/AC220V
In (8/20 μs):
10kA
Imax(8/20 μs):
20kA
Reference Standards:
IEC61643OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
Signal & Data SPD
Uc(V) :
8V
Un(V) :
5V
In (8/20 μs):
10kA
Imax(8/20 μs):
20kA
Reference Standards:
IEC 61643-21OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
DC Power SPD
Un(V):
DC12/24/48/120/220/380/750/1000
Uc(V):
DC15/30/60/175/275/505/1060/1200
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingSolutions
Different systems require different SPD types, voltage levels, wiring structures and installation positions. Select your application scenario to view the recommended protection strategy.FAQ
Can CRESIN support large-scale solar farm projects?
Yes. CRESIN can provide SPD recommendations for rooftop solar, commercial PV systems, utility-scale solar farms, combiner boxes, inverters, monitoring systems, and AC distribution cabinets.
What DC voltage should be selected for PV SPD?
The SPD voltage rating should match the maximum PV system voltage. Common options include 600V DC, 1000V DC, 1200V DC, and 1500V DC.
Should solar PV systems use Type 1 or Type 2 SPD?
If the PV system has an external lightning protection system or a high risk of direct lightning current, Type 1 or Type 1+2 SPD may be required. For many common PV systems, Type 2 SPD is used to protect against induced surges.
Do I need SPD on both DC and AC sides of the inverter?
Yes. The DC side protects the PV array and inverter input, while the AC side protects the inverter output and connected distribution system.
Why do solar PV systems need surge protection?
Solar PV systems are often installed outdoors with long DC cable runs and exposed metal structures. Lightning-induced surges can enter through PV strings, inverter inputs, AC output lines, and monitoring systems.
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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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