Solar SPD for Photovoltaic Surge Protection
A solar SPD is a surge protective device used in photovoltaic systems to protect PV panels, combiner boxes, inverters, and AC distribution equipment from lightning-induced surges and transient overvoltage.
LEEYEE supplies DC and AC solar surge protective devices for rooftop, commercial, and utility-scale PV systems. Choose from 600V, 1000V, and 1500V DC solar SPDs, Type 2 and Type 1+2 PV SPDs, and AC SPDs for inverter output and distribution boards.
Quick Answer for Buyers
For most solar PV systems, surge protection should be considered on both sides of the inverter.
A DC solar SPD protects PV strings, combiner boxes, and inverter DC inputs. An AC solar SPD protects the inverter AC output, distribution board, and downstream low-voltage panel.
Answer Snapshot
DC Surge Protector for Solar PV Systems
In solar applications, a DC surge protector is a PV-rated surge protective device installed on the direct-current side of the system. It limits transient overvoltage and diverts surge current before the surge reaches the inverter or other sensitive equipment.
What should a solar buyer choose?
Choose the SPD by installation side first, then confirm voltage, SPD type, discharge current, pole configuration, certificate requirement, and applicable standard.
Key selection rule
Do not select a DC solar SPD only by the nominal PV system voltage. The maximum PV string open-circuit voltage at the minimum design temperature should be checked before selecting Ucpv.
For example, a 1000V DC PV system does not automatically mean every 1000V DC SPD is suitable. Module Voc, modules per string, low-temperature voltage rise, grounding method, and local electrical requirements should be reviewed.
Real Product Options
Solar SPD Models for 600V, 1000V, 1500V DC and AC Side Protection
These models give buyers a practical starting point for PV surge protection selection. Final selection should still be confirmed according to PV string voltage, wiring method, grounding system, lightning exposure, and project certificate requirement.
LY1-C40PV/3(S) 1500V(D4)
High-voltage DC solar SPD for utility-scale PV arrays, combiner boxes, inverter DC inputs, and DC distribution panels.
LY1-C40PV/2(S) 1000V
Two-pole pluggable Type 1+2 DC SPD for 1000V PV strings, combiner boxes, inverter DC inputs, and DC cabinets.
LY1-C40PV/2(S) 600V
Two-pole Type 2 DC SPD for 600V PV systems, residential solar, commercial PV, DC panels, and energy-storage DC circuits.
LY1-C40/4(S) AC SPD
Type 2 AC surge protective device for inverter AC output, AC distribution boards, low-voltage panels, and solar AC side protection.
*The 600V product card displays Iimp according to the current confirmed product information. For formal project submission, please match the final quotation and certificate scope with the exact selected model.
Definition
What Is a Solar SPD?
A solar SPD, also called a PV surge protective device, solar surge protector, or DC surge protector for solar PV, is used to reduce the risk of equipment damage caused by lightning, switching operations, and transient overvoltage in photovoltaic power systems.
Why It Matters
Why Solar PV Systems Need Surge Protection
Solar PV systems are usually installed outdoors, with long cable routes and sensitive inverter electronics. Surge protection is important because one surge event can damage the inverter, interrupt power generation, and increase maintenance cost.
Outdoor Exposure
PV modules, DC cables, and combiner boxes are exposed to outdoor lightning-related surge risks.
Long Cable Runs
Long DC cable routes can pick up induced surge voltage, especially in rooftop and ground-mounted PV systems.
Inverter Protection
Inverters contain sensitive electronics. Surge damage may cause downtime, replacement cost, and generation loss.
System Continuity
Correct SPD selection helps reduce unexpected failure in PV strings, DC boxes, inverter cabinets, and AC panels.
Installation Position
Where Is SPD Installed in a Solar PV System?
Solar surge protection is usually arranged on both the DC side and the AC side. DC SPDs protect the PV array and inverter input. AC SPDs protect the inverter output and downstream distribution system.
When one DC SPD may be enough
A single DC SPD near the inverter DC input may be considered when the PV array is close to the inverter, cable length is short, and project risk assessment does not require additional protection at the PV array side.
When both cable ends may need protection
If the distance between the PV array or combiner box and inverter is long, surge protection may need to be considered at both ends of the DC cable route according to system design and local requirements.
DC Side vs AC Side
DC Solar SPD vs AC Solar SPD
DC and AC SPDs are not interchangeable. The arc behavior, circuit characteristics, voltage rating, and applicable testing standards are different.
DC Solar SPD
DC solar SPD is designed for photovoltaic DC circuits and is commonly used in 600V, 1000V, or 1500V DC PV systems.
- PV string combiner box
- DC distribution box
- Inverter DC input side
- Photovoltaic DC circuits
- IEC/EN 61643-31 reference
AC Solar SPD
AC solar SPD is installed after the inverter to protect AC low-voltage power circuits and distribution equipment.
- Inverter AC output
- AC distribution cabinet
- Main low-voltage panel
- Grid-connected PV systems
- IEC/EN 61643-11 reference
Type Selection
Type 2 vs Type 1+2 Solar SPD
The SPD type should be selected according to lightning exposure, external lightning protection, cable route, grounding system, and project risk assessment.
| PV Project Condition | Common SPD Direction | Buyer Notes |
|---|---|---|
| Standard rooftop or commercial PV system without direct lightning-current exposure | Type 2 PV SPD | Commonly used for induced lightning surges and switching overvoltage. |
| PV system affected by an external lightning protection system | Type 1+2 PV SPD | Consider where partial lightning current may enter the PV electrical system. |
| Utility-scale solar farm or high lightning exposure area | Project-specific Type 1+2 and Type 2 coordination | Selection should follow the full protection design, including DC, AC, grounding, and cable layout. |
| Long DC cable route between PV array and inverter | SPD protection may be required at both cable ends | Confirm according to cable length, route exposure, and local electrical rules. |
Selection Guide
How to Choose a Solar SPD
Choose a solar SPD according to the installation side, PV system voltage, SPD type, discharge capacity, wiring method, project lightning exposure, and certificate requirement.
| Selection Point | What to Check | Recommended Direction | Why It Matters |
|---|---|---|---|
| Installation Side | DC side or AC side | Use DC SPD before inverter; use AC SPD after inverter | DC and AC circuits require different SPD designs |
| PV System Voltage | Maximum calculated PV string open-circuit voltage at the minimum design temperature | Select an SPD with a suitable Ucpv above the calculated maximum string voltage | Module Voc, modules per string, and low-temperature voltage rise must be considered |
| SPD Type | Lightning exposure, external lightning protection, and risk assessment | Type 2 for induced and switching surges; Type 1+2 where partial lightning current may enter | The required SPD class depends on the actual lightning-current exposure of the installation |
| Discharge Capacity | In, Imax, or Iimp rating | Select based on project protection design | Higher surge risk may require higher discharge capacity |
| Wiring / Poles | PV wiring structure and grounding method | 2P, 3P, 4P, or project-specific configuration | Correct pole configuration supports safe surge discharge |
| Installation Method | Cabinet, combiner box, or DIN rail mounting | 35mm DIN rail pluggable SPD is commonly used | Easy replacement and maintenance reduce downtime |
| Certificate Requirement | TUV, CB, CE, test report, or project filing documents | Confirm model scope before formal submission | Certificates should match the exact model and project requirement |
| Standard Reference | PV DC side or AC power side | IEC/EN 61643-31 for PV DC SPD; IEC/EN 61643-11 for AC SPD | Standards help define testing and performance requirements |
Final SPD selection should be confirmed according to the actual PV design, grounding system, cable length, lightning risk level, and local electrical requirements.
Model Comparison
Solar SPD Parameter Comparison
This table helps buyers compare common LEEYEE solar SPD options by voltage, type, discharge rating, installation side, and application.
| Model | Installation Side | Type | Voltage | Poles | In / Imax | Iimp | Application |
|---|---|---|---|---|---|---|---|
| LY1-C40PV/3(S) 1500V(D4) | PV DC side | Class I+II / Type 1+2 | 1500V DC | 3P | 20kA / 40kA | 6.25kA | Utility-scale PV, combiner box, inverter DC input |
| LY1-C40PV/2(S) 1000V | PV DC side | Class I+II / Type 1+2 | 1000V DC | 2P | 20kA / 40kA | 6.25kA | PV strings, combiner boxes, inverter DC inputs |
| LY1-C40PV/2(S) 600V | PV DC side | Class II / Type 2 | 600V DC | 2P | 20kA / 40kA | 6.25kA* | Residential PV, commercial PV, DC panels, ESS DC circuits |
| LY1-C40/4(S) | Solar AC side | Type 2 AC SPD | 75V / 150V / 275V / 320V / 385V / 440V AC | 1P / 2P / 3P / 4P | 20kA / 40kA | Project-specific AC SPD selection | Inverter AC output, AC distribution board, low-voltage panel |
*For the 600V Type 2 DC SPD, Iimp is displayed according to the confirmed available product information. For certificate filing or formal tenders, confirm the final model scope and test report before submission.
Certificates & Documents
Solar SPD Verification and Download Support
For professional procurement, the product model, parameter sheet, certificate scope, and test report should be checked together. LEEYEE can provide document support for selected PV SPD and AC SPD series.
Product Selection or System Design
Do You Need a Solar SPD or a Complete PV Protection Solution?
Choose a solar SPD product when you already know the required installation side, system voltage, SPD type, and wiring configuration. A complete PV surge protection solution is recommended when the system architecture still needs to be evaluated.
Choose a Solar SPD Product
Use this page when the main task is to compare DC or AC SPD models, voltage ratings, discharge parameters, pole configurations, product pictures, and common installation positions.
- DC or AC side is already known
- System voltage and wiring are confirmed
- Required SPD type is already defined
- A product model, certificate, or quotation is needed
Choose a Complete PV Protection Solution
Use a system-level solution when you still need to determine how the DC side, AC side, cable routes, lightning protection system, and communication lines should be protected together.
- Type 2 or Type 1+2 is not yet determined
- SPD installation positions need to be planned
- Long cable routes may require protection at both ends
- RS485, Ethernet, or monitoring lines may need protection
Applications
Solar SPD Applications
LEEYEE solar SPD products are suitable for different PV protection applications, from small rooftop systems to commercial and utility-scale projects.
Residential Rooftop Solar
Protects inverter input/output and rooftop PV cable routes from transient surge voltage.
Commercial PV Systems
Suitable for factory rooftops, commercial buildings, schools, hospitals, and public facilities.
Utility-Scale Solar Farms
Supports PV string, combiner box, inverter station, and AC distribution protection design.
Solar Combiner Boxes
Commonly integrated into DC combiner boxes together with fuses, isolators, and monitoring devices.
Inverter Cabinets
Used on DC input and AC output sides to reduce surge-related inverter damage risk.
OEM Electrical Panels
Available for cabinet builders, distributors, solar EPC companies, and OEM protection assemblies.
Procurement Checklist
Information to Prepare Before Asking for a Solar SPD Quote
A clearer project description helps the supplier recommend the correct solar SPD faster and reduces the risk of choosing the wrong voltage, type, or pole configuration.
Electrical Data
- PV system voltage
- Maximum string Voc
- Modules per string
- DC or AC installation side
Installation Data
- Combiner box or inverter input
- Cable length and route
- Grounding method
- Cabinet or DIN rail space
Business Data
- Target certificate requirement
- Quantity and delivery plan
- OEM label or packaging need
- Datasheet and test report request
LEEYEE / CNSPD
Solar SPD Supplier for Safer PV Electrical Systems
LEEYEE is a specialized surge protection and low-voltage protection supplier, trusted for solar PV, power distribution, telecom, industrial, and OEM applications.
CNSPD is LEEYEE’s surge protection-focused brand platform, built to help global buyers source reliable SPDs and related low-voltage protection products.
For solar SPD buyers, model-specific datasheets, certificate documents, product photos, OEM support, and selection assistance can be provided according to the selected product series.
FAQ
Solar SPD FAQ
These questions help buyers understand solar SPD selection, installation position, voltage rating, certificate support, and common protection requirements for PV systems.
What does solar SPD mean?
Solar SPD means solar surge protective device. It is installed in photovoltaic systems to limit transient overvoltage and discharge surge current before it damages PV equipment.
What is a DC surge protector for solar PV?
A DC surge protector for solar PV is a PV-rated SPD installed on the DC side of the system, such as in the combiner box, DC protection box, or near the inverter DC input.
Which solar SPD model should I choose for 1500V PV systems?
For 1500V PV systems, a 1500V DC SPD such as LY1-C40PV/3(S) 1500V(D4) can be considered when its voltage rating, pole configuration, surge rating, and certificate scope match the project design.
Which solar SPD model should I choose for 1000V PV systems?
For 1000V DC PV strings and combiner boxes, LY1-C40PV/2(S) 1000V is a Type 1+2 DC SPD option with 20kA In, 40kA Imax, and 6.25kA Iimp.
Which SPD is used on the AC side of a solar inverter?
For inverter AC output or AC distribution boards, an AC SPD such as LY1-C40/4(S) can be used when the selected AC voltage and pole configuration match the system design.
Do solar panels need SPD?
Solar panels and PV systems are often installed outdoors with long DC cable routes, so SPD is strongly recommended, especially in areas with lightning activity or unstable grid conditions.
Where should SPD be installed in a solar PV system?
DC SPD is usually installed between the PV array and inverter, such as inside the combiner box or near the inverter DC input. AC SPD is usually installed after the inverter on the AC output side.
What is the difference between DC solar SPD and AC solar SPD?
DC solar SPD is designed for photovoltaic DC circuits such as 600V, 1000V, or 1500V DC systems. AC solar SPD is used after the inverter for AC low-voltage distribution circuits.
Can AC SPD be used on the DC side of a solar PV system?
No. AC SPD and DC SPD are designed for different circuit characteristics. A PV DC circuit should use a PV-rated DC SPD with a suitable Ucpv and standard reference.
How do I choose a solar SPD?
Choose a solar SPD according to system voltage, maximum string Voc, DC or AC installation side, SPD type, discharge current rating, wiring configuration, grounding method, project lightning exposure, and certificate requirement.
What voltage solar SPD should I use?
The DC SPD should be selected according to the calculated maximum PV string open-circuit voltage at the minimum design temperature. Module Voc, modules per string, and low-temperature voltage rise should be considered before selecting a suitable Ucpv.
Is Type 2 SPD enough for solar PV?
Type 2 PV SPD is commonly used where protection is mainly required against induced and switching surges. Type 1+2 PV SPD should be considered where partial lightning current may enter the electrical system, such as installations affected by an external lightning protection system or projects identified by risk assessment.
Do these solar SPD models have TUV and CB support?
Yes. TUV and CB document support is available for the solar SPD models discussed on this page. For formal tenders or project filing, please confirm the certificate scope against the exact selected model.
What information should I provide for solar SPD selection?
You can provide PV system voltage, maximum string Voc, inverter type, DC or AC side installation, grounding method, number of strings, cabinet type, project location, lightning risk level, and target certification requirement.
Related Product Topics
Related Solar SPD and Surge Protection Pages
Explore related surge protection products and solar PV protection pages to compare DC SPD, AC SPD, 1500V DC SPD, certificates, and complete PV protection solutions.
Need Help Selecting the Right Solar SPD?
Tell us your PV system voltage, maximum string Voc, inverter side, application, grounding method, cabinet requirement, quantity, and target certificate. LEEYEE can help recommend a suitable DC or AC solar SPD.