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Explore our top-selected bare stranded copper wire products designed specifically for solar PV array wiring, grounding, and interconnection applications.
High-Performance Flexible Stranded Copper Wire for Solar Panel Array Wiring
Soft Connection Conductive Tape Copper Flat Wire for Solar Array Grounding
Soft Connection Welding Wire Segment Soft Copper Stranded Wire for PV Systems
Soft Copper Stranded Wire for Solar Panel Flexible Connection Solutions
As global solar capacity surpasses 1.6 terawatts and continues to grow exponentially, the demand for reliable, high-conductivity bare stranded copper wire has never been greater. From rooftop residential systems to multi-megawatt utility-scale solar farms, bare stranded copper wire serves as the critical backbone of every solar panel array — ensuring maximum energy transfer efficiency, long-term corrosion resistance, and compliance with international electrical safety standards.
Understanding the technical and commercial significance of bare stranded copper wire in modern photovoltaic (PV) installations is key to selecting the right materials for your solar project.
Copper is the gold standard for electrical conductivity, with a conductivity rating of approximately 58 MS/m — nearly 60% higher than aluminum. In solar panel array wiring, this translates directly into reduced resistive losses, higher energy yield per panel, and lower operational costs over the system's 25–30 year lifespan. Bare stranded copper wire, composed of multiple fine copper strands twisted together, further enhances flexibility and current-carrying capacity compared to solid wire.
Solar arrays are permanently exposed to UV radiation, moisture, temperature extremes, and atmospheric pollutants. Bare copper naturally forms a thin oxide layer that protects against deep corrosion, making it highly suitable for outdoor grounding conductors, equipment bonding, and array interconnection in both dry and humid climates. For coastal or high-humidity environments, tinned copper variants offer additional protection while maintaining excellent conductivity.
The multi-strand construction of bare stranded copper wire provides exceptional flexibility, allowing installers to route wiring through conduits, around racking structures, and across complex rooftop geometries with ease. This flexibility reduces installation time, minimizes the risk of wire breakage during handling, and accommodates the thermal expansion and contraction cycles that solar arrays experience daily.
Bare stranded copper wire used in solar panel array wiring must comply with standards such as IEC 60228, NEC Article 690, UL 4703, and EN 50618. These standards define conductor cross-sections, strand counts, temperature ratings, and installation requirements. Sourcing wire from certified manufacturers like Zhejiang Xingma Copper Industry ensures compliance, system safety, and eligibility for grid-connection approvals and insurance coverage.
Our bare stranded copper wire is engineered to meet the demanding requirements of solar panel array wiring across all installation types and climatic conditions.
Rated for operation from -40°C to +90°C, our bare stranded copper wire maintains stable electrical performance across all climatic zones — from desert solar farms to cold-climate rooftop arrays.
Precision-drawn copper strands with tight tolerances ensure minimal resistive losses in DC circuits, maximizing the energy output of every solar panel in the array and improving overall system ROI.
Bare copper wire is the preferred conductor for solar array grounding and bonding systems. Its bare surface provides optimal metal-to-metal contact with grounding clamps, lugs, and rods, ensuring effective fault current dissipation.
Available in AWG 6 to AWG 2/0 and metric sizes from 4mm² to 95mm², with custom strand counts, lengths, and packaging options to meet project-specific requirements for residential, commercial, and utility applications.
Manufactured under ISO 9001 quality management and ISO 14001 environmental management systems, with full RoHS compliance and third-party test reports available upon request.
With over 300 advanced manufacturing machines and 2,000+ tons annual capacity, we ensure reliable supply with fast lead times and worldwide export capabilities from our Zhejiang facility.
Common specifications for bare stranded copper wire used in solar panel array wiring applications. Custom specifications are available upon request.
| Conductor Size | Strand Count | Conductor OD (mm) | DC Resistance (Ω/km) | Current Capacity (A) | Primary Solar Application |
|---|---|---|---|---|---|
| 6 AWG (16mm²) | 19/1.03mm | 5.2 | 1.15 | 75–95 | String-to-combiner wiring |
| 4 AWG (25mm²) | 19/1.30mm | 6.6 | 0.727 | 95–120 | Combiner-to-inverter runs |
| 2 AWG (35mm²) | 19/1.53mm | 7.8 | 0.524 | 120–150 | Main DC feeder cables |
| 1/0 AWG (50mm²) | 19/1.83mm | 9.3 | 0.387 | 150–185 | Large-scale array interconnection |
| 2/0 AWG (70mm²) | 19/2.14mm | 10.9 | 0.268 | 185–230 | Utility-scale grounding & bonding |
| 4/0 AWG (95mm²) | 19/2.52mm | 12.8 | 0.193 | 230–280 | Substation & transformer connections |
The global solar energy transition is reshaping demand patterns for bare stranded copper wire. Here are the key commercial and industrial trends driving growth in this sector.
Global solar PV installations are projected to exceed 500 GW annually by 2030, according to the International Energy Agency. Each megawatt of solar capacity requires approximately 4–6 tons of copper wiring, creating enormous demand for bare stranded copper wire from solar developers, EPC contractors, and equipment manufacturers worldwide.
Utility-scale solar projects — ranging from 50 MW to multi-gigawatt solar parks — are the fastest-growing segment of the solar market. These projects require large quantities of heavy-gauge bare stranded copper wire for DC collection systems, equipment grounding networks, and substation connections, creating significant procurement opportunities for high-volume copper wire suppliers.
The residential and commercial rooftop solar segment continues to expand rapidly in Asia, Europe, and North America. Smaller-gauge bare stranded copper wire is essential for grounding conductors, equipment bonding jumpers, and array-to-inverter DC wiring in these distributed systems, creating high-volume demand for standardized wire products.
Emerging solar installation types — including floating solar on reservoirs and agrivoltaic systems over agricultural land — present unique wiring challenges. These environments demand bare stranded copper wire with enhanced corrosion resistance, UV stability, and mechanical flexibility, driving innovation in wire construction and surface treatment technologies.
The integration of battery energy storage systems (BESS) with solar arrays is becoming standard practice. This increases the complexity of DC wiring systems and expands the range of bare stranded copper wire specifications required — from fine-strand flexible wire for battery connections to heavy-gauge bare copper for high-current DC bus connections.
China accounts for over 40% of global copper wire and cable production, with manufacturers like Zhejiang Xingma Copper Industry Co., Ltd. supplying high-quality bare stranded copper wire to solar projects across Asia, the Middle East, Africa, Europe, and the Americas. Competitive pricing, large production capacity, and improving quality standards are accelerating China's dominance in this market.
Bare stranded copper wire serves multiple critical functions within a solar panel array system. Understanding each application scenario helps engineers and procurement teams specify the correct wire type and gauge.
Bare stranded copper wire is the industry-standard choice for equipment grounding conductors in solar arrays. EGCs bond all metal racking components, module frames, inverter enclosures, and combiner boxes to a common ground reference, ensuring that fault currents are safely conducted to earth. NEC 690.43 and IEC 62548 specify minimum conductor sizes based on overcurrent protection ratings, typically ranging from 6 AWG to 2 AWG for residential and commercial systems.
In utility-scale solar farms, bare stranded copper wire forms the backbone of the grounding grid — a network of conductors buried beneath the array that provides a low-impedance path for lightning-induced surge currents. Properly designed grounding grids using bare copper wire significantly reduce the risk of equipment damage, fire, and personnel injury from direct and indirect lightning strikes.
Individual solar modules require bonding to the mounting structure to eliminate potential differences between adjacent metal components. Short sections of bare stranded copper wire — typically 6 AWG or 8 AWG — are used as bonding jumpers between module frames and racking rails, ensuring electrical continuity throughout the array structure.
Inside DC combiner boxes, bare stranded copper wire connects multiple string inputs to the common DC bus. The flexibility of stranded construction is essential in this application, as wires must be routed through tight spaces and connected to terminal blocks, fuses, and disconnect switches. Fine-stranded Class 5 or Class 6 copper wire is typically specified for these internal connections.
String inverters, central inverters, and microinverters all require robust grounding connections to comply with safety standards and utility interconnection requirements. Bare stranded copper wire provides the reliable, low-resistance grounding path needed to protect against ground faults, arc-fault conditions, and rapid shutdown system activation in modern solar installations.
Floating solar installations on lakes, reservoirs, and coastal areas present extreme corrosion challenges for electrical wiring. Bare stranded copper wire, optionally with tinned coating, is selected for its superior resistance to moisture, salt spray, and biological fouling. The flexibility of stranded construction also accommodates the constant movement of floating platforms without fatigue failure.
Our bare stranded copper wire products serve diverse industries and application environments, from solar energy to automotive, communications, and heavy industry.
Solar / New Energy
Automotive Industry
Communication Industry
Electrical Switch
Heavy Industry
5 Years of Excellence in Copper Wire Manufacturing for Solar, Industrial & Commercial Applications
Zhejiang Xingma Co., Ltd. was established in 2019 and is located in Liushi — the capital of electrical appliances in China. The company is primarily engaged in metal products, wire and cable processing and sales, as well as import and export of goods and technology. Revolving around modern enterprise mechanisms and mass production through mechanical automation, Xingma has rapidly grown into a leading supplier of copper wire products for solar, industrial, and commercial markets worldwide.
The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, and is committed to scientific and technological innovation as the foundation of sustainable growth. With a factory building exceeding 10,000 square meters, more than 100 employees, and over 300 domestic top-level manufacturing machines, Xingma delivers consistent quality at scale.
Leading products include copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection series products, and metal stamping parts — all best-selling at home and abroad, deeply trusted and welcomed by customers in the solar energy sector and beyond.
Zhejiang Xingma Copper Industry Co., Ltd. operates a comprehensive manufacturing facility equipped with over 300 state-of-the-art machines, enabling precision production of bare stranded copper wire in a wide range of specifications for solar panel array wiring and other demanding applications.
Key manufacturing equipment includes: Dingtian wire drawing machines, Fuchuan beam machines, pipe twisting machines, braiding machines, annealing furnaces, middle drawing machines, automatic cutting machines, welding machines, air dryers, microscope hardness testers, automatic punching machines, 160-ton punching machines, wire dividing machines, flattening machines, large polishing machines, stamping parts cleaning machines, bench drills, and packing machines.
With an annual production capacity exceeding 2,000 tons, Xingma is well-positioned to fulfill large-volume orders for solar EPC contractors, distributors, and OEM customers worldwide — with fast lead times and reliable delivery performance.
Browse our full range of copper wire and cable products — all engineered for superior performance in solar panel array wiring, industrial automation, and electrical connection applications.
High-Performance Flexible Stranded Copper Wire for Solar Panel Array Wiring
Soft Connection Conductive Tape Copper Flat Wire for Solar Array Grounding
Soft Connection Welding Wire Segment Soft Copper Stranded Wire for PV Systems
Soft Copper Stranded Wire for Solar Panel Flexible Connection Solutions
Customizable Bend-Resistant Plastic-Coated Copper Stranded Wire for Solar Array Wiring
Flexible Bend-Resistant Plastic-Coated Copper Stranded Wire for Solar PV Installations
Tinned Copper Braided Tape for Solar Panel High-Temperature Anti-Corrosion Applications
Soft Connection Conductive Tape Copper Flat Wire for Solar Array Reliable Electrical Connections