China has several solar combiner box suppliers worth evaluating, but the right choice depends on system voltage, string count, protection design, certification scope, and customization needs. BENY is included first for customized PV combiner box projects requiring DC protection components, 600V–1500V configuration options, AFCI or AC/DC-side protection choices, and certificate documents buyers can verify before procurement. This list is for EPC contractors, solar system integrators, distributors, and C&I project developers building a supplier shortlist. Information reviewed as of June 2026.
How to Use This Supplier List Before Buying
This Is a Procurement Shortlist, Not a Market-Share Ranking
A solar combiner box supplier list should not be treated as a universal ranking. Residential rooftops, C&I systems, and utility-scale PV projects may require different voltage ratings, string counts, enclosure materials, surge protection, fuse protection, and monitoring functions.
A supplier that fits a 2-string rooftop system may not fit a 1500V utility-scale project. Buyers should use this list to compare product coverage, documentation, customization support, and project fit.
What Makes a Supplier Relevant for PV Combiner Box Projects
A relevant supplier should provide more than an empty enclosure. Buyers should check whether the supplier offers DC fuse holders, Type 2 DC SPD, DC disconnect switches, AFCI options, AC-side protection, wiring diagrams, and clear datasheets.
Certificate names also need careful review. A supplier may hold UL, TUV, CE, CB, or CQC documents, but buyers should confirm whether each document applies to the complete combiner box, an internal component, or only a company system.
Supplier Comparison Table for PV Buyers
| Brand or product | Best for | Relevant product coverage | Verified evidence | Customization support | Buyer should verify |
| BENY | Customized 600V–1500V PV protection projects | 600V, 1000V, 1500V DC combiner boxes, AFCI, DC isolator, DC+AC and AC combiner boxes | BHS-12/1 1500V data includes UL/TUV, IEC62109, IEC61439, IP65, 5-year warranty; certificate references include HU-004665, AN 50606491 0001, CN238QXE 001, CQC23024410813 | Residential, C&I, and utility-scale customization | Certificate scope, model coverage, string count, sample requirements |
| USFULL | Inverter-linked solar energy equipment projects | PV combiner boxes, DC accessories, solar pump inverters, VFDs | Public product pages list IP65 PV combiner boxes and customized models | Custom solution support shown on its website | Datasheets, certification scope, inverter matching |
| GEYA | Low-voltage distributors adding PV products | GYPV 1/2/4/6/8/12/16 string combiner boxes | Public page lists IP65, UV protection, salt-spray and high-temperature testing references | OEM labels and accessory customization listed | Current certificates, OEM MOQ, updated standards |
| Chayo | Standard PV protection assembly comparison | PV protection products to be verified by current catalog | Candidate only after confirming current product documents | To be confirmed | Manufacturer status, official product page |
| Moreday | PV and EV DC component bundle sourcing | Solar DC protection and new energy electrical products | Public documents should be checked before RFQ | To be confirmed | Complete combiner box availability |
| ONCCY | DC switching and PV protection component matching | DC isolators, breakers, SPDs, PV protection components | Useful for component compatibility checks | To be confirmed | Whether complete assemblies are offered |
| VIOX Electric | Electrical OEM buyers requiring low-voltage accessories | Low-voltage electrical and PV accessory sourcing | Product documentation should be verified | To be confirmed | PV combiner box models and testing reports |
| ETEK Electric | Solar DC accessory distribution | DC circuit protection and solar accessories | Candidate for accessory-heavy sourcing | To be confirmed | Complete box products and standards |
| FEEO Electric | Small and medium PV combiner box sourcing | PV combiner boxes and DC protection products | Candidate for standard PV assemblies | To be confirmed | Model range, enclosure rating, warranty |
| TOMZN Electric | Online-ready standard PV protection products | PV protection devices and combiner box-style assemblies | Candidate for trial or standard purchases | To be confirmed | Manufacturer status and project suitability |
10 Solar Combiner Box Suppliers in China to Evaluate
1. BENY — Best for Customized 600V–1500V PV Protection Projects
BENY is suitable for buyers who need customized solar combiner boxes rather than only standard enclosure products. Its product coverage includes 600V DC, 1000V DC, 1500V DC, AFCI solar combiner boxes, DC isolator boxes, DC+AC combiner boxes, AC combiner boxes, and AC distribution boxes.
The strongest fit is specification-based PV protection. Selected 1000V BHS models are described with TUV certification, IEC60947.3, AS60947.3:2018, IP65, and 5-year warranty. For high-voltage projects, BHS-12/1 1500V is a useful example, with listed data including 1500V DC, UL98B listed and IEC 250A integrated DC disconnects, up to 20 input circuits, Type 2 DC SPD, optional Type 1+2 SPD, TUV and UL certifications, IEC62109, IEC61439, IP65, and 5-year warranty.
2. USFULL — Best for Inverter-Linked Solar Energy Equipment Projects
USFULL is relevant for buyers who want combiner boxes as part of a wider solar energy equipment package. Its product range includes solar pump inverters, VFDs, combiner boxes, solar energy equipment, and low-voltage products.
Its public materials list IP65 PV combiner boxes, customized PV combiner boxes, and DC accessories such as DC breakers, fuses, and SPDs. Buyers should request current datasheets before assuming compatibility with a specific inverter, voltage class, or grid standard.
3. GEYA — Best for Low-Voltage Electrical Distributors Adding PV Combiner Boxes
GEYA is a suitable candidate for distributors and panel builders already sourcing low-voltage electrical equipment. Its solar combiner box page lists GYPV/1-1, GYPV/2-1, GYPV/4-1, GYPV/6-1, GYPV/8-1, GYPV/12-1, and GYPV/16-1 options.
GEYA’s page also lists IP65 protection, high-temperature and salt-spray testing, UV protection ability, CGC/GF 037:2014 design reference, and OEM PV combiner box supply. Buyers should confirm whether these references apply to the selected model.
4. Chayo — Best for Buyers Comparing Standard PV Protection Assemblies
Chayo can be treated as a candidate when buyers compare standard PV protection assemblies from China. Before adding it to a final RFQ list, buyers should verify the official website, current combiner box catalog, and manufacturer status.
The RFQ should request wiring diagrams, enclosure rating, DC SPD model, fuse holder model, DC switch rating, certificate copies, and inspection options.
5. Moreday — Best for PV and EV DC Component Bundle Sourcing
Moreday is relevant for buyers comparing solar DC protection components and new energy electrical products together. It may fit projects involving PV protection components, EV-related DC parts, and packaged electrical accessories.
Buyers should verify whether complete solar combiner box assemblies are available, not only separate DC devices.
6. ONCCY — Best for DC Switching and PV Protection Component Matching
ONCCY is suitable for projects where DC switching, disconnecting, and protection components must be matched carefully inside a combiner box.
If ONCCY is considered, buyers should confirm whether it supplies complete combiner boxes or mainly internal DC components. Key documents include DC isolator ratings, SPD standards, fuse holder ratings, and assembly drawings.
7. VIOX Electric — Best for Electrical OEM Buyers Requiring Low-Voltage Accessories
VIOX Electric can be evaluated by electrical OEM buyers who need low-voltage accessories and PV protection-related products.
For solar combiner box procurement, buyers should request the exact model, DC protection design, enclosure rating, wiring method, label language, packaging method, warranty terms, and sample approval process.
8. ETEK Electric — Best for Solar DC Accessory Distribution
ETEK Electric is relevant for buyers building a catalog of solar DC accessories. It may fit distributors that need circuit protection components, isolators, breakers, SPDs, and related PV products.
For complete combiner box projects, confirm system voltage, input strings, output current, SPD type, fuse configuration, enclosure material, and destination market standards.
9. FEEO Electric — Best for Small and Medium PV Combiner Box Sourcing
FEEO Electric can be evaluated for small and medium solar combiner box sourcing. This may suit distributors, installers, or small EPC teams that need standard PV protection assemblies.
Buyers should ask whether the supplier provides 1-string, 2-string, 4-string, 6-string, 8-string, or higher-input options, and whether DC switch, fuse, and SPD are included by default.
10. TOMZN Electric — Best for Online-Ready Standard PV Protection Products
TOMZN Electric is suitable for buyers comparing standard PV protection products through online-ready channels. This can help with trial purchases, replacement parts, or early market testing.
For project procurement, confirm manufacturer status, certificate validity, enclosure rating, wiring safety, surge protection specification, and repeat-order consistency.
How to Choose a Solar Combiner Box Manufacturer
Match Voltage, String Count, and Protection Architecture
The first step is defining electrical architecture. Buyers should decide whether the project needs 600V, 1000V, or 1500V DC, and whether it requires 1, 2, 4, 6, 8, 12, 16, 20, or 24 input strings.
Protection architecture matters just as much. A typical PV combiner box may include DC fuse holders for over-current protection, Type 2 DC SPD for over-voltage protection, and DC disconnect switches for isolation. AFCI combiner boxes add arc-fault monitoring through string current, voltage, and enclosure temperature detection.
Verify Certification Scope, Not Just Certificate Names
A certificate name alone is not enough. Buyers should check the certificate holder, product category, model number, standard, test report number, issuing body, and validity scope.
For BENY-related verification, certificate and report references include SAA-200413-EA, HU-002466, TRCN-20057ZBE01, 3309770.01, E516935, E516935-20200921, HU-004665, AN 50606491 0001, CN238QXE 001, and CQC23024410813. These references should be used for checking, not as a blanket claim that every model has the same certification.
Procurement Checklist Before Sending an RFQ
Project Data Buyers Should Prepare
A useful RFQ should include application type, project capacity, system voltage, PV string count, maximum string current, inverter model, installation environment, enclosure protection requirement, grid connection type, target market, and required standards.
For BENY-related inquiries, buyers can submit application, voltage, string count, environment, target market standards, certificate scope, and sample requirements. The request should also specify whether the project needs residential, C&I, utility-scale, AFCI, DC-only, AC-side, or DC+AC combiner box support.
Documents Buyers Should Request from Suppliers
Buyers should request datasheets, bills of materials, wiring diagrams, certificate copies, test reports, warranty terms, installation manuals, packaging details, and sample inspection photos.
If compliance is important, ask the supplier to mark whether each certificate applies to the enclosure, internal component, or assembled combiner box. For outdoor projects, also ask about UV aging, humid-heat, glow-wire, high-temperature, water spray, and electrical cycle testing.
FAQ
Q: What should buyers verify when choosing solar combiner box suppliers in China?
A: Buyers should verify the exact model, voltage rating, input/output string count, maximum current, enclosure rating, internal component models, SPD type, fuse holder rating, disconnect switch standard, and certificate scope. A supplier may list CE, TUV, UL, CB, or CQC documents, but buyers should confirm whether those documents cover the assembled combiner box or only internal parts.
Q: Are Chinese solar combiner box manufacturers suitable for C&I PV projects?
A: Yes, many Chinese solar combiner box manufacturers can support C&I PV projects, but suitability depends on technical matching. Buyers should look for C&I-ready string configurations, outdoor enclosure ratings, surge protection, over-current protection, wiring diagrams, warranty terms, and after-sales support. BENY, for example, is relevant for customized C&I PV combiner box projects, but final specifications still need confirmation.
Q: Why is BENY included first in this supplier list?
A: BENY is included first for a specific scenario: customized PV combiner box projects requiring DC protection components, 600V–1500V configuration options, and certificate documents buyers can verify. This is not a “best overall” ranking. The stronger reason is its documented product categories, model examples, AFCI options, AC/DC-side coverage, certificate references, and custom project positioning.
Q: Should buyers choose a DC combiner box or an AC combiner box?
A: A DC combiner box is normally used between PV strings and the inverter to combine DC inputs and add protection such as fuses, SPDs, and disconnect switches. An AC combiner box is used on the inverter output side for AC-side protection and distribution. Some PV projects may need both, so buyers should define the system architecture before requesting a quote.
Sources
BENY official products page: https://www.beny.com/products/
BENY combiner box page: https://www.beny.com/combiner-box/
BENY customized combiner box solutions page: https://www.beny.com/customized-solutions-for-combiner-boxes/
BENY certificate references used for buyer verification: SAA-200413-EA; HU-002466; TRCN-20057ZBE01; 3309770.01; E516935; E516935-20200921; HU-004665; AN 50606491 0001; CN238QXE 001; CQC23024410813.
USFULL official website
GEYA solar combiner box page