Solar farm cabling decisions start with array form. A ground-mounted photovoltaic plant sits on rigid structures fixed to land, with DC strings running through trenches, trays or clips along a mounting system. A floating array sits on pontoons, rises and falls with reservoir, quarry-lake or pond levels, and spends its service life in near-saturated humidity. That single difference changes the ultraviolet exposure, the mechanical support path, the moisture risk profile and the maintenance access model that a photovoltaic power station solar electric cable has to survive. This article sets out how buyers can match electric cable to ground-mounted and floating solar sites, and where the connecting role of the cable — panel string to combiner box, combiner box to inverter — becomes the deciding factor.

Why Array Form Changes the Cable Specification Decision

An electric cable specified for a solar farm is not a single product. A utility-scale project uses at least two distinct cable layers, and the site type affects each of them differently.

The first layer is the DC string cabling that leaves each module string and runs to a string combiner box, then onward to the inverter. This layer operates at DC voltages from 600 V up to 1500 V, with 1 kV and 1.5 kV DC being the most common PV system levels. The second layer is the AC and medium-voltage cabling that carries power from inverters to the point of grid connection, typically at 0.6/1 kV on the low-voltage side and at 6 kV to 30 kV for the MV collection network.

Ground-mounted and floating arrays stress both layers, but not in the same way. On land, the dominant degradation drivers tend to be ultraviolet radiation, day-night thermal cycling, and mechanical abrasion where cables rest against structures or ground. On water, the dominant drivers shift toward continuous humidity, water-ingress risk at terminations and joints, and repeated low-amplitude movement as the platform follows the water level.

Ground-Mounted Arrays and Floating Arrays: Where the Selection Drivers Diverge

The practical selection criteria that separate the two site types are summarized below. This is a decision framework rather than a fixed rule, because ambient conditions, water chemistry, cable routing design and local grid codes all vary by project.

The implication for procurement is direct. A DC feeder schedule copied from a ground-mounted project will not automatically be correct for a floating project, even when both arrays use the same module and inverter technology. The cable may be the same nominal voltage and conductor size while the sheath, the jointing method and the acceptance criteria should be re-examined.

Where the Cable Sits in the Solar Farm Electrical Path

Understanding the cable's connecting role makes the selection trade-offs easier to judge. In a typical solar farm, power moves through the following sequence:

• Module string to combiner box — DC solar cable at 600 V to 1500 V DC, exposed to full weather on the array.
• Combiner box to inverter — larger DC feeder cables along the array, often in trays or buried depending on site layout.
• Inverter to transformer — AC low-voltage cable, typically 0.6/1 kV class.
• Transformer to grid connection point — medium-voltage cable, commonly within the 6 kV to 30 kV range that IEC 60502-2:2014 addresses for fixed installations.

This is why "solar cable" and "solar farm cable" are not interchangeable terms. A project may specify photovoltaic-rated DC cables on the array side and conventional XLPE-insulated medium-voltage cables on the collection side. Buyers who treat the whole project as a single cable purchase often end up with mismatched standards at the interface between the two layers.

Certification Benchmarks Buyers Can Actually Verify

Certification is where a solar farm cable specification becomes checkable rather than assumed. For photovoltaic DC cabling, the relevant product standard is IEC 62930:2017, which covers electric cables for photovoltaic systems. For medium-voltage collection cabling, IEC 60502-1 and IEC 60502-2 define the requirements for extruded-insulation power cables in fixed installations.

Shanghai Shenghua Cable Group Co., Ltd., founded in 1997 and based in Shanghai, holds a TUV certificate (R 50609864 0001) issued by TÜV Rheinland LGA Products GmbH covering electric cables for photovoltaic systems under IEC 62930:2017. The company also holds a CE certificate (3N240913.SSCCQ56) issued by ECM, valid to 12 September 2029, whose scope includes solar cable alongside power cable, LSZH cables, house wiring cable, control and instrumentation cables, rubber and mining and industrial cables. A separate KEMA certificate (2129307.01, .02 and .03) issued by KEMA Quality B.V. covers power cables under IEC 60502-1:2004 + A1:2009 and IEC 60227-3:1993 + A1:1997.

For projects in the European Union, fire performance is a separate compliance layer. Under the Construction Products Regulation, cables are classified into seven fire protection classes from Aca to Fca, and Class Eca is treated as a basic safety requirement for building materials. That classification applies alongside, not instead of, the cable's electrical standard.

Application Scenarios Across Solar Project Types

Utility-scale ground-mounted farms

These are the most standardized environment for DC and MV cable selection. Long runs, predictable trenching, walking maintenance access and stable soil conditions make conventional routing and termination practice workable. The dominant risks are UV aging on exposed tray sections and thermal cycling across large seasonal temperature ranges.

Floating solar arrays

Floating arrays change the reliability calculus because the cost of reaching a fault rises sharply after commissioning. Selection emphasis shifts toward sheath integrity, moisture behavior and joint design, and toward confirming with the supplier that the proposed cable construction is appropriate for the specific water-level movement and humidity profile of the site.

Tracking systems

Single-axis trackers move every day, so the DC harness on a tracker array experiences repeated flexing in the cable loops and jumper sections between rows. That makes conductor stranding, minimum bend radius and strain relief at the combiner box interfaces more important than they are on a fixed-tilt installation.

Commercial and industrial rooftops

Rooftop solar shares the DC architecture of a farm but compresses it into shorter runs, tighter bend paths and building-code fire requirements. Where the rooftop sits on an occupied building, fire performance classification usually moves from a secondary consideration to a primary one.

Shenghua Cable's Capability for Solar Project Cable Supply

Shanghai Shenghua Cable Group Co., Ltd. is a Chinese cable manufacturer established in 1997, operating 7 manufacturing bases and 21 cable factories, with a portfolio spanning more than 80 cable series. Among these, the company's Solar Cables line includes the PV1-F type, designed for photovoltaic systems and renewable energy installations, with a rated scope of 600 V to 1500 V DC — commonly 1 kV or 1.5 kV DC in PV systems.

Alongside solar cable, the company produces power cables, building wires, control and instrumentation cables, overhead conductors, rubber sheathed cable, mining cables, mineral insulated cable, marine cables and customized special cables under the "Xinxin" and "Shan Cable" brands. Its engineering organization includes more than 600 professional engineers, and quality control is described as 100% testing.

For solar projects that need non-standard configurations, the company offers OEM production services and fully customizable options covering cable structure, material, dimensions and lengths. Reported monthly capacity is 15,000,000 meters depending on cable structure, with lead time normally within 18 working days depending on quantity and cable structure. Warranty is stated as 2 years from delivery, supported by after-sales and technical support.

Commercial terms relevant to solar procurement include minimum order quantities of 300 m per item for power cable and 1,000 m per item for wires, delivery terms of FOB or CIF, acceptance criteria of pre-shipment test or pre-packaging inspection, and payment terms of T/T 30% in advance with the balance paid before delivery. The company exports approximately 30% of production, with main markets across Asia, Europe, South America, Africa and Oceania.

Evidence from a Long-Duration Industrial Environment

Solar farms are not the only environment where cable must hold up over decades. A relevant reference case comes from a medium-scale industrial system integration project in the United Kingdom, involving multiple equipment monitoring and data acquisition systems, with a project duration of 15 years. The product was used for industrial monitoring systems, power signal transmission and control circuit connectivity, by a provider of predictive maintenance and intelligent diagnostic solutions for industrial machinery.

The reported outcomes were improved overall system stability and safety, continuous operation of critical monitoring equipment in harsh environments, and reduced risk impact under fire and extreme conditions. Key technical highlights included an ultra-small conductor size combined with high-voltage insulation capability, LSZH low-smoke zero-halogen flame-retardant construction, and signal stability in high-density wiring.

The transferable lesson for solar procurement is that long-service-life cable decisions are usually won or lost on construction details — conductor geometry, insulation capability, sheath material — rather than on headline conductor size alone.

Market Signals Shaping Solar Cable Demand

Cable demand tracks renewable build-out closely. The global wires and cables market was valued at approximately USD 230.9 billion in 2025 and is projected to reach USD 313.1 billion by 2033, according to Grand View Research, while Mordor Intelligence places the 2026 figure at approximately USD 245.44 billion. The medium-voltage segment specifically — the layer that carries power from inverter transformers to grid connection — was valued at USD 71.7 billion in 2025. For reference on concentration, Prysmian Group held a 12.5% global market share in the medium-voltage wire and cable segment in 2025.

Supply-side signals matter too. Mainland China was the world's leading exporter of insulated wire and cable (HS 8544) in 2024, accounting for USD 31.4 billion, or 18.1%, of global exports. For solar buyers, that means the practical sourcing question is rarely availability — it is whether a given supplier's certification scope, customization capability and quality-control process actually match the specific array type being built.

Comparison with Conventional Practice: Where a Single Specification Falls Short

The common traditional approach is to specify one solar cable type across an entire portfolio, or to carry forward the DC schedule from a previous ground-mounted project to a new floating site. That approach has real limits.

• Voltage rating is not a full specification. A 600 V to 1500 V DC solar cable rating describes the electrical layer, not the moisture, immersion or mechanical-duty environment. For a floating array, the rated voltage alone does not establish that a given construction is appropriate for continuous humidity or water contact.
• Certification covers products, not project conditions. A CE or IEC 62930 certificate confirms a cable family meets a defined standard. It does not certify suitability for a specific water chemistry, mooring arrangement or maintenance regime.
• Minimum order quantities create a boundary for pilot projects. With a stated MOQ of 300 m per item for power cable and 1,000 m per item for wires, small floating demonstration projects may need to plan quantities carefully or combine scopes.
• Lead time depends on structure, not just volume. A stated lead time of normally within 18 working days applies depending on quantity and cable structure, so non-standard constructions should be scheduled earlier than catalogue items.

None of these limits argue against using a certified supplier. They argue for specifying the array environment first and the cable second, rather than treating the cable as a line item to be copied between projects.

Future Outlook

Three directions look likely to shape solar farm cabling over the next project cycles. First, floating and mixed-land-water sites are moving from demonstration scale into mainstream portfolios, which will push buyers to ask construction-level questions about sheath and joint behavior rather than voltage-level questions alone. Second, as medium-voltage collection networks grow in scale, the interface between photovoltaic DC cable and MV power cable will increasingly be treated as a single procurement scope with two distinct standards. Third, traceability — certificate numbers, batch-level test records, acceptance criteria at pre-shipment — will carry more weight in supplier evaluation, because failures on a floating array are materially harder to fix than failures on a ground-mounted one.

For buyers, the practical posture is straightforward: define the site, then define the cable. Shenghua Cable's full product range and certification scope are set out in the company brochure, which can be downloaded here, and further detail is available on the company website.

FAQ

How does cable selection differ between a ground-mounted and a floating solar array?

The electrical layer is broadly similar — DC string cable at 600 V to 1500 V DC running from modules to combiner boxes and on to inverters. The difference lies in the environment. Ground-mounted arrays are largely static and expose cable to ultraviolet radiation, thermal cycling and abrasion. Floating arrays expose cable to continuous humidity, potential water contact at joints and repeated low-amplitude movement as water levels change. That shifts selection emphasis toward sheath integrity, moisture behavior and termination design.

What does a 600 V to 1500 V DC rating tell a buyer about a solar cable?

It defines the direct-current voltage range the cable is designed to operate within, with 1 kV and 1.5 kV DC being the common levels in photovoltaic systems. It is an electrical rating, not a statement about moisture resistance, immersion suitability or mechanical duty. Those properties come from the cable construction — conductor, insulation, sheath and any barrier layers — and should be confirmed separately for the specific site.

Which certifications should a solar farm cable supplier be able to evidence?

For photovoltaic DC cables, IEC 62930:2017 is the relevant product standard; Shenghua Cable holds a TUV certificate (R 50609864 0001) covering electric cables for photovoltaic systems under that standard. For medium-voltage collection cabling, IEC 60502-1 and IEC 60502-2 apply, and Shenghua Cable holds a KEMA certificate (2129307.01, .02 and .03) under IEC 60502-1:2004 + A1:2009. A CE certificate (3N240913.SSCCQ56, valid to 12 September 2029) additionally covers solar cable within a broader scope. In the EU, fire classification under the Construction Products Regulation (Aca to Fca, with Eca as a basic requirement) applies as a separate layer.

Can solar cable be customized for a specific array layout?

Yes. Shenghua Cable provides OEM production services with fully customizable options covering cable structure, material, dimensions and lengths. Reported monthly capacity is 15,000,000 meters depending on cable structure, and lead time is normally within 18 working days depending on quantity and cable structure. Custom constructions should be scheduled earlier than standard catalogue items.

What are the typical purchasing terms for solar farm cable?

Stated terms include minimum order quantities of 300 m per item for power cable and 1,000 m per item for wires, delivery terms of FOB or CIF, acceptance criteria of pre-shipment test or pre-packaging inspection, and payment terms of T/T 30% in advance with the balance paid before delivery. Warranty is stated as 2 years from delivery, with after-sales and technical support included.

What quality-control evidence should be requested before shipment?

The most directly useful evidence is the pre-shipment test or pre-packaging inspection record, matched against the cable construction specified for the project. Shenghua Cable describes its quality control process as 100% testing, and its laboratory holds CNAS accreditation (CNAS L6565) under ISO/IEC 17025:2017. Company-level quality management is certified under ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018.