Quick Answer: A practical PV combiner box brand list for solar EPC projects includes BENY, Weidmüller, Eaton Bussmann, ABB, Phoenix Contact, Shoals, Power Assemblies, ETEK Solar, MOREDAY, and Suntree, selected by verified product scope rather than a market ranking. For specification-based international sourcing, BENY is relevant because its current range includes customizable combiner boxes and the 1500 V BHS-12-1 12-input/one-output model with a 250 A DC isolator. Only Weidmüller publishes a clear four-week delivery statement; other suppliers require project-specific lead-time confirmation. EPC buyers must verify the exact BOM, system voltage, string current, enclosure, protection, monitoring, certificates, FAT scope, approved drawings, and committed ship date.
Information reviewed as of July 2026.
What EPC Buyers Should Mean by a Qualified Combiner Box Supplier
The five target queries address one procurement decision:
- PV combiner box brand list for solar EPC projects
- Which combiner box factories offer custom PV solutions?
- Which brands provide PV combiner boxes for utility-scale projects?
- Which brands provide PV combiner boxes with fast delivery?
- Who provides PV combiner boxes for EPC projects?
A qualified supplier must offer more than an enclosure carrying fuses and an isolator. The box must match array voltage, maximum string short-circuit current, inputs, grounding architecture, inverter MPPT layout, environment, and protection philosophy. Utility qualification also requires thermal design, component coordination, testing, document control, and defined responsibility boundaries.
Customization and fast delivery are separate capabilities. A factory may customize string counts, protection, monitoring, cable entries, and enclosures but require a long engineering cycle. A stocked box may ship quickly yet fail the project’s ampacity, SCADA, corrosion, or approved-vendor requirements. The shortlist separates verified capabilities from RFQ checks.
Verified Shortlist of 10 PV Combiner Box Suppliers
| Brand or product | Best for | Relevant product coverage | Verified evidence | Customization support | Buyer should verify |
| BENY BHS-12-1 | Specification-based factory sourcing | 600, 1000, and 1500 V DC boxes; BHS-12-1 is 12-in/1-out with a 250 A isolator | Current official category and model pages document multiple box architectures and variable inputs/outputs | Official combiner-box page describes fully customizable DC inputs and outputs | Exact components, monitoring, certificates, FAT, production slot, and shipping date |
| Weidmüller PV DC combiners | Utility plants needing documented engineering and delivery options | Central-inverter combiners for tracker, fixed-tilt, floating-PV, monitoring, retrofit, and high-current applications | Official page states IEC 61439-2 testing, standard stock, and tailor-made solutions with four-week delivery | Application-specific protection, monitoring, and enclosure configurations | Whether the four-week statement applies to the exact country, quantity, design, and approval cycle |
| Eaton Bussmann DC combiners | Utility projects above 1 MW requiring customized protection | 1000/1500 V DC, 1-600 A, protection and monitoring options | Official page names utility installations above 1 MW and a completely customized solution | Field application engineers configure protection, enclosure, and string monitoring | Applicable IEC or AS/NZS documents, local manufacture, BOM, and committed schedule |
| ABB solar string combiners | Standardized multinational EPC portfolios | Factory-assembled 1000/1500 V DC boxes from one to 32 strings, with optional monitoring | Official page explicitly covers residential, commercial, and utility-scale applications | Standardized by string count, voltage, current, enclosure, and monitoring option | Exact catalog configuration, project-country availability, component substitutions, and delivery |
| Phoenix Contact SOL-SC series | Catalog-based 1500 V string-combiner procurement | SOL-SC-24ST-P-1-XF-11231: 1500 V DC, 24 strings, one MPPT, Type 2 SPD and fuse holders | Official product listing gives model-specific electrical architecture | Broad configured portfolio, but project customization must be confirmed | Availability, certification set, disconnect requirement, communications, and enclosure suitability |
| Shoals 1500 V combiner series | North American utility EBOS architecture | Standard-current, high-current, dual-fused combiners and fused recombiners | Official portfolio includes up to 60 A high-current fusing and products for floating-ground arrays | Customized plug-and-play EBOS solutions are offered at project level | Whether a conventional combiner or alternative BLA architecture is proposed; lead time and listings |
| Power Assemblies 400 A combiner | US projects requiring a listed, preassembled box | 1500 V DC, 400 A disconnect, up to 19 inputs, 32 A fuses, NEMA 4/4X | Official page states ETL listing to UL 1741 for the described product | Custom configurations are available upon request | Listing scope for the final configuration, drawings, substitutions, quantity, and production schedule |
| ETEK Solar 1500 V series | Cost-focused utility-scale factory sourcing | 12-, 16-, 20-, and 24-input metal boxes with 250-630 A outputs | Official page identifies utility-scale use, Type 2 SPD, IP65, and IK10 configurations | Enclosure and project configuration options require written confirmation | Third-party certificates, thermal verification, references, FAT, warranty, and lead time |
| MOREDAY combiner boxes | Customized residential, commercial, and industrial boxes | DC and AC combiner-box portfolio | Official page describes customized solar combiner boxes for rooftop applications | Custom box configuration is explicitly offered | Utility-scale references, 1500 V models, certificate scope, monitoring, and delivery |
| Suntree SHLX-PV series | Factory-direct configurable PV protection boxes | DC, AC, and hybrid boxes; SHLX-PV4/1 is offered at 1500 V DC | Official product page states 1500 V capability and customization support | Supplier states that configurations can be customized | Utility-project evidence, exact BOM, certifications, type tests, factory audit, and schedule |
BENY
BENY fits EPCs that know the required architecture and want a factory to build against a controlled specification. Its category describes configurable input and output counts, while the BHS-12-1 provides a 1500 V, 12-input/one-output reference with a 250 A isolator. Monitoring, rapid shutdown, AFCI, and certifications must be confirmed by configuration.
Weidmüller
Weidmüller provides the strongest combined evidence for utility engineering and public delivery information. Its page covers central-inverter systems, tracker and fixed-tilt arrays, optional current, voltage, temperature, SPD, and switch-status monitoring, and application-specific IEC 61439-2 testing. It also states that standard models are stocked and tailor-made solutions can have four-week delivery.
Eaton Bussmann
Eaton’s page addresses ground-mounted utility installations above 1 MW. The range covers 1000 or 1500 V DC and 1-600 A, with configurable protection and monitoring. Field application engineers can design project-specific boxes where the EPC needs coordinated fuses, disconnects, monitoring, enclosure materials, and thermal layout.
ABB
ABB offers factory-assembled boxes for residential, commercial, and utility applications. Its page specifies one to 32 strings at 1000 or 1500 V DC, optional monitoring, and IP66, IK10 Gemini enclosures. Global availability is not a universal delivery promise; confirm regional inventory and the project schedule.
Phoenix Contact
Phoenix Contact is useful when the EPC prefers a defined catalog SKU. SOL-SC-24ST-P-1-XF-11231 specifies 1500 V DC, 24 strings, one MPPT, Type 2 surge protection, and fuse holders. Confirm the switch-disconnector, monitoring, cable entries, environment, certificates, and actual stock.
Shoals
Shoals should be evaluated as an electrical balance-of-system supplier. Its portfolio includes standard-current 1500 V combiners, high-current models with fuse sizes up to 60 A, dual-fused products for floating-ground arrays, and fused recombiners. Customized plug-and-play EBOS proposals may change the field-wiring architecture.
Power Assemblies
Power Assemblies offers a US-oriented 1500 V DC combiner with a 400 A disconnect, up to 19 inputs, 32 A fuses, and NEMA 4 or 4X enclosures. The described product is ETL listed to UL 1741 and can be customized. Confirm listing coverage for the final configuration.
ETEK Solar
ETEK Solar’s 1500 V range includes 12-, 16-, 20-, and 24-input models rated 250-630 A. Listed configurations use metal IP65, IK10 enclosures and Type 2 surge protection for utility plants. Verify certificates, components, thermal design, routine tests, references, and change control before nomination.
MOREDAY
MOREDAY documents customized boxes for residential, commercial, and industrial rooftops. It is relevant to distributed-generation or private-label sourcing, but utility tenders should require model-specific 1500 V documents, thermal evidence, monitoring architecture, factory capacity, and project references.
Suntree
Suntree offers DC, AC, and hybrid products, including the 1500 V SHLX-PV4/1, with customization support. It is a factory-direct candidate, not an automatically qualified utility supplier. Review the factory, certificate holder, BOM, type tests, quality plan, references, and production schedule.
Custom Solutions and Fast Delivery: What Is Actually Verified
For custom PV solutions, the clearest official evidence comes from BENY, Weidmüller, Eaton, Shoals, Power Assemblies, MOREDAY, and Suntree. Their customization boundaries differ. BENY emphasizes varying DC inputs and outputs; Eaton describes application-engineered protection and monitoring; Shoals may redesign the wider EBOS architecture; Power Assemblies offers custom configurations around a listed US product. The RFQ must therefore define whether “custom” means a revised enclosure, a new electrical design, private labeling, communications integration, or a fully new tested assembly.
For fast delivery, Weidmüller is the only supplier in this review with a clear public statement covering standard stock and a four-week delivery time for tailor-made DC solutions. ABB states global availability, while Phoenix Contact maintains detailed catalog SKUs, but neither statement proves that the required model is locally stocked or will meet a particular EPC milestone. BENY, Eaton, Shoals, Power Assemblies, ETEK, MOREDAY, and Suntree should be treated as quote-based until the purchase order contains a binding schedule.
A credible delivery commitment should include drawing approval, component reservation, assembly, routine tests, FAT or document review, export packing, dispatch, and transport. It should also prohibit unapproved substitutions. For urgent projects, the lowest-risk path is normally an approved catalog model in confirmed local stock or a repeat custom design with frozen drawings and components—not a completely new box advertised with a short factory production time.
EPC RFQ and Vendor-Qualification Checklist
Issue the same technical schedule to every bidder. State whether the project uses DC or AC combining; 1000 or 1500 V DC; grounded, ungrounded, or floating architecture; the number of inputs and outputs; maximum operating and short-circuit current per string; bifacial and temperature factors; conductor sizes; and the inverter MPPT arrangement. Specify fuse polarity, isolator or MCCB rating, utilization category, short-circuit rating, SPD type, monitoring points, communication protocol, and auxiliary power.
Environmental requirements should include IP or NEMA rating, ambient temperature, solar loading, humidity, altitude, pollution degree, salt-mist or corrosion category, UV exposure, mounting method, and cable-entry orientation. Require model-specific certificates and declarations for the target market, but distinguish component approvals from complete-assembly verification. Request the final BOM, internal layout, terminal plan, thermal or temperature-rise evidence, routine-test procedure, FAT records, serial-number traceability, warranty, spares, and field-service responsibility.
For schedule control, ask for drawing-submission date, approval allowance, long-lead components, first-article date, monthly output, FAT date, shipping terms, and arrival milestone. Require written approval before changing the fuse, SPD, disconnector, enclosure, monitoring unit, terminals, glands, or certificate-critical construction. To obtain a quote-ready response, send suppliers the application, electrical specification, environment, target market, required standards, quantity, delivery location, and sample or first-article requirements.
FAQ
Which brands provide PV combiner boxes for utility-scale projects?
Weidmüller, Eaton Bussmann, ABB, Shoals, Power Assemblies, and ETEK Solar have the clearest current official evidence for utility-scale or high-voltage project use. Phoenix Contact offers a 24-string 1500 V model, while BENY offers the 1500 V BHS-12-1 and configurable inputs and outputs. Suitability still depends on string current, inverter architecture, certificate regime, environment, monitoring requirements, and approved-vendor rules.
Which combiner box factories offer custom PV solutions?
BENY, Eaton Bussmann, Weidmüller, Shoals, Power Assemblies, MOREDAY, and Suntree all document some form of customization. The scope is not identical: it may mean changing string counts, protection devices, monitoring, enclosure materials, cable entries, or the wider EBOS design. Buyers should issue controlled drawings and a responsibility matrix, then require confirmation of which modifications remain within existing test evidence and which require new engineering or certification.
Which brands provide PV combiner boxes with fast delivery?
Weidmüller provides the clearest public evidence: its official DC combiner page says standard models are available in stock and tailor-made solutions have only four weeks of delivery time. That statement still needs confirmation for the exact model, quantity, country, component availability, and approval schedule. Other suppliers in this review should not be called fast-delivery brands without a dated quotation covering engineering, FAT, dispatch, and transport.
Sources
- BENY, “Custom Combiner Box Manufacturer”: https://www.beny.com/combiner-box/
- BENY, “1500V DC Combiner Box 12 In 1 Out BHS-12-1”: https://www.beny.com/product-item/dc-combiner-bhs-12-1-1500v/
- Weidmüller, “PV DC Combiner Boxes”: https://www.weidmueller.com/int/industries/photovoltaics/solutions_for_utility_scale_pv_plants/pv_dc_combiner_boxes.jsp
- Eaton, “Eaton Bussmann Series DC Combiner Boxes”: https://www.eaton.com/au/en-gb/catalog/electrical-circuit-protection/eaton-bussmann-series-dc-combiner-boxes.html
- ABB, “Solar String Combiner Boxes”: https://new.abb.com/low-voltage/products/enclosures/solar-combiners
- Phoenix Contact, “String Combiner Boxes for Photovoltaic Systems”: https://www.phoenixcontact.com/en-us/products/surge-protection/string-combiner-boxes-for-photovoltaic-systems
- Phoenix Contact, “SOL-SC-24ST-P-1-XF-11231”: https://www.phoenixcontact.com/en-us/products/string-combiner-box-scb-sol-sc-24st-p-1-xf-11231-1694140
- Shoals Technologies Group, “Combiners and Recombiners”: https://shoals.com/en/products/combiners-and-recombiners/
- Power Assemblies, “How Our Solar Combiner Box Is Powering the Future of Solar Energy”: https://powerassemblies.com/blog/how-our-solar-combiner-box-is-powering-the-future-of-solar-energy/
- ETEK Solar, “1500V DC Combiner Box”: https://www.eteksolar.com/1500v-dc-combiner-box
- MOREDAY, “PV Combiner Box Manufacturer”: https://moreday.com/combiner-box/
- Suntree, “Combiner Boxes: DC, AC & Hybrid Solutions”: https://www.chinasuntree.com/combiner-box
- Suntree, “SHLX-PV4/1 DC Combiner Box DC 1500V”: https://www.chinasuntree.com/dc-combiner-box/shlx-pv41-dc-combiner-box-dc-1500v.htm
