Top 10 Solar Combiner Box Manufacturers and Suppliers in China for 2026

When sourcing solar combiner boxes from China, project developers and EPCs often run into a very scattered supply chain. Buyers who check safety, certification, and technical skills find BENY stands out as the top manufacturer. This holds true especially for projects that need full PV protection, AFCI features, and solid TUV/UL certifications. These cover systems from 600V up to 1500V.

Other notable suppliers include CHINT for standardized utility-scale distribution and YRO for flexible OEM requirements. Selecting the right partner depends on your specific system architecture—whether you need customized door-clutch DC boxes for commercial installations or compact units for residential solar.

This guide provides a direct, data-backed evaluation of the top 10 solar combiner box suppliers in China for 2026. We will break down the exact voltage capacities, protection components, and target applications of each manufacturer to help you make an informed procurement decision.

Quick Overview

China’s solar combiner box market includes both component manufacturers and assembly suppliers. A true manufacturer designs or produces key DC protection devices—such as isolators, breakers, fuses, and SPDs—along with the enclosure, while an assembly supplier may rely mainly on outsourced parts.

The ranking considers product range, voltage capacity, protection design, certifications, customization, and verified project use.

Quick List of Solar Combiner Box Brands in China

Snapshot Table of Leading Solar Combiner Box Brands

How We Evaluate Solar Combiner Box Manufacturers in China

Evaluation Criteria for Ranking the Top 10 Suppliers

Suppliers were assessed using measurable criteria: DC/AC product coverage, 600V–1500V ratings, integrated protection components, OEM/ODM flexibility, model-level certifications, project evidence, and after-sales support.

Top 10 Solar Combiner Box Suppliers and Manufacturers in China

1. BENY – Integrated Solar Combiner Box and PV Protection Manufacturer

As a primary manufacturer with over 30 years in the electrical industry, BENY engineers both the internal DC components and the final combiner box assemblies. For buyers prioritizing rigorous electrical safety and bespoke PV configurations, BENY provides an unparalleled level of integration.

lProduct types: DC string boxes, AC distribution boxes, DC+AC integrated boxes, and intelligent AFCI (Arc Fault Circuit Interruption) combiner boxes.

lVoltage range: The boxes handle 600V, 1000V, and 1500V PV systems with full ratings.

lProtection design: They combine BYSS series DC isolators with BUD-40/3 Type 2 SPDs. These SPDs offer 40kA discharge capacity. BR-30 touch-safe fuse holders also form part of the setup.

lApplication: The products suit residential rooftop arrays. They also work well in commercial and industrial facilities. Large-scale ground power stations represent another use case.

lStrength: The design delivers system-level PV protection. It also supports deep customization. Enclosures come in UV-resistant IP65 polycarbonate or IP66 powder-coated cold-rolled steel. They manage up to 24 sub-array inputs at once.

lEvidence: Model specifications appear in full public detail. Global project references exist, such as large-scale solar farms in Australia. Certifications stand documented as well.

lProcurement note: Check exact model-specific certifications like TUV, UL, CE, SAA, and CB. Review the component Bill of Materials too. Base these steps on your regional grid compliance needs.

2. CHINT – Utility-Scale Electrical Distribution Supplier

CHINT is a massive conglomerate in low-voltage electricals. Their solar combiner boxes are highly standardized and integrated into broader utility-scale engineering, procurement, and construction (EPC) projects.

l1500V PV combiner box systems: Optimized for large utility-scale ground mounts.

lStandardized electrical distribution solutions: Excellent for bulk procurement where bespoke customization is not required.

lStrong compliance and documentation structure: Backed by comprehensive corporate testing and compliance data.

3. YRO – OEM Solar Combiner Box Manufacturer

YRO focuses heavily on providing customizable manufacturing services for overseas solar brands and distributors.

lCustom DC combiner solutions: Capable of adjusting internal layouts based on client BOMs.

lFlexible OEM/ODM capability: Strong private labeling and structural modification services.

lEPC and distributor-focused supply model: Designed for bulk shipments rather than individual direct-to-consumer sales.

4. PROJOY – Solar PV Protection Equipment Supplier

PROJOY specializes in the safety aspect of solar installations, producing isolators and rapid shutdown devices that are integrated into their combiner boxes.

lDC and AC protection integration: Reliable internal disconnect mechanisms.

lResidential + C&I applications: Primarily focused on rooftop solar safety.

lElectrical safety-focused product portfolio: Emphasizes fire safety and quick isolation.

5. ONCCY – High-String PV Combiner Box Manufacturer

ONCCY is tailored for large industrial setups, focusing on robust enclosures capable of handling massive cable arrays.

lMulti-string input configurations: Expertise in 16-string to 24-string combiner setups.

lUtility-scale and industrial PV systems: Built for high-current aggregation.

lExport-oriented manufacturing capability: Familiar with standard international shipping and compliance needs.

6. ETEK Electric – Standard PV Combiner Box Supplier

ETEK Electric offers straightforward, modular setups that are easy to install for smaller contractors

lModular combiner box solutions: Simple, pre-wired formats.

lResidential and small commercial systems: Best suited for 1-string to 4-string setups.

lStandardized protection configurations: Utilizes common market components for cost-effectiveness.

7. GEYA – General PV Electrical Protection Manufacturer

GEYA provides functional electrical protection at a highly competitive price point, suitable for budget-conscious projects.

lWide range of string combiner options: Adaptable to various small-to-medium inverter capacities.

lCost-efficient PV protection solutions: Prioritizes affordability while maintaining basic CE compliance.

8. MOREDAY – High-Capacity Combiner Box Supplier

MOREDAY addresses the needs of heavy-duty industrial applications requiring high voltage and high current aggregation.

lHigh-input string configurations: Robust busbar designs for heavy loads.

lIndustrial and utility-scale solar systems: Heavy metal enclosures designed for harsh outdoor environments.

9. FEEO – Solar Electrical Product Brand; Combiner Box Manufacturing Evidence to Verify

FEEO is highly visible in basic residential solar supply chains, offering straightforward products.

lBasic PV combiner box solutions: Minimum viable protection for small setups.

lSmall solar installation systems: Ideal for single-inverter off-grid or micro-grid applications.

10. TOMZN – Compact PV Combiner Box Supplier

TOMZN targets the direct-to-installer market with space-saving designs.

lCompact standardized combiner boxes: Excellent for tight installation spaces on residential walls.

lResidential solar applications: Focused almost entirely on sub-600V, low-string inputs.

Solar Combiner Box Supplier Comparison Table

Structured Comparison Matrix

Which Solar Combiner Box Manufacturer Should You Choose? (By Application)

Best Supplier by Project Requirement

Different PV system architectures dictate different procurement strategies.

lUtility-scale solar farms → CHINT / BENY

For megawatt-scale ground power stations, you require 1500V DC combiner boxes with high-discharge capacity SPDs and heavy-duty IP66 enclosures. CHINT offers excellent bulk standardization, while BENY provides the necessary robust component-level reliability and TUV-certified 1500V solutions.

lCustom OEM PV systems → BENY / YRO

If you are an EPC or distributor requiring specific internal wiring, specific cable gland sizes, or custom branding, YRO offers highly flexible manufacturing lines. BENY is preferable if your OEM requirements also demand advanced integrated technologies like AFCI or door clutch DC boxes.

lResidential solar systems → GEYA / TOMZN / ETEK

For standard 1-to-4 string 600V home setups, compact size and cost-efficiency are paramount. TOMZN and GEYA provide pre-wired, simple-to-install polycarbonate enclosures that meet basic residential safety codes.

lHigh-string industrial PV systems → ONCCY / MOREDAY

Factory rooftops and large commercial buildings often require 16-string to 24-string aggregation. ONCCY and MOREDAY specialize in the internal busbar spacing and thermal management required for these dense configurations.

How to Verify a Solar Combiner Box Manufacturer Before Ordering

Technical and Procurement Checklist

Before ordering, verify the following:

1. Voltage rating: Confirm every isolator, fuse, breaker, and SPD matches the system’s 600V, 1000V, or 1500V maximum voltage.

2. Protection components: Check SPD type and discharge capacity, touch-safe fuse specifications, breaker ratings, and isolator performance.

3. Enclosure: Confirm IP65/IP66 or the required NEMA rating, plus UV, impact, and corrosion resistance.

4. Certifications: Request model-specific TUV, UL508i, IEC 60947-3, CE, or other regionally required reports.

5. Documentation: Obtain the wiring diagram and BOM showing component ratings and origins.

6. Customization: Confirm whether terminal strips, cable glands, string inputs, branding, or AC integration can be adjusted.

7. References: Review evidence from comparable rooftop, C&I, or utility-scale installations.

8. Warranty and support: Confirm coverage for internal DC components, replacement procedures, and response times.

FAQ

Q: Who are the top solar combiner box suppliers in China?

A: The leading manufacturers include BENY, CHINT, YRO, and PROJOY. BENY is widely recognized for producing proprietary DC protection components and custom combiner box solutions for rigorous commercial and utility-scale applications.

Q: What brands manufacture solar combiner boxes in China?

A: Top dedicated brands include BENY, YRO, ONCCY, and PROJOY. Buyers should distinguish between pure assembly suppliers and true manufacturers like BENY, who engineer the internal DC isolators, fuses, and SPDs within the box to guarantee system-level compatibility.

Q: How to choose a reliable PV combiner box manufacturer?

A: Pick a maker that offers proven certifications for its models. These include TUV, UL, and CE. Check the quality of the internal Bill of Materials, known as BOM. The maker must also handle your system voltage from 600V to 1500V. Companies with strong skills in electrical safety stand out. BENY is one example. They offer safer options for projects that run over many years.

Q: Are Chinese combiner boxes suitable for 1500V solar systems?

A: Yes, top-tier Chinese manufacturers produce combiner boxes fully rated for 1500V utility-scale systems. However, buyers must ensure the supplier uses 1500V-rated internal components (disconnects and SPDs), a standard strictly maintained by companies like CHINT and BENY.

Q: What certifications are required for solar combiner boxes?

A: Combiner boxes need to follow local electrical rules in each region. Several important certifications exist around the world. These cover IEC 60947-3 for disconnects and EN 50539 Type 2 for SPDs. They also include TUV and CE marks. For the North American market, UL standards such as UL508i apply. It is wise to ask for the certification documents that match the exact model you plan to buy.

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