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Our flagship copper bar products deliver unmatched electrical conductivity and thermal performance, purpose-built for solar inverters, wind turbine generators, battery energy storage systems, and EV charging infrastructure.
As the global transition to clean energy accelerates, pure copper bars have emerged as an indispensable material across solar, wind, hydro, and battery storage sectors. With electrical conductivity exceeding 99.9% IACS, pure copper bars minimize resistive losses and maximize energy transmission efficiency in every renewable energy application.
Pure copper bus bars form the core of solar photovoltaic (PV) systems, connecting inverters, combiner boxes, and grid tie points. The global solar PV market surpassed 1.6 TW of installed capacity in 2024, driving enormous demand for high-conductivity copper bus bars in utility-scale and distributed generation projects alike.
Offshore and onshore wind turbines rely on pure copper bars within nacelle generator windings, power conversion units, and transformer connections. As wind capacity installations exceed 100 GW annually worldwide, the specification for low-resistance, corrosion-resistant copper bus bars has never been more demanding.
Grid-scale lithium-ion battery storage requires precision copper bus bars for cell interconnects, module busbars, and pack-level current collectors. Copper's superior thermal conductivity (401 W/m·K) ensures safe heat dissipation during rapid charge-discharge cycles critical to frequency regulation and peak shaving applications.
DC fast chargers and ultra-fast charging stations demand pure copper bus bars capable of handling 350+ kW continuous power delivery. Copper's combination of high conductivity, mechanical strength, and solderability makes it the material of choice for charging cabinet busbars and power distribution units.
Modern smart grid upgrades and high-voltage direct current (HVDC) transmission systems utilize pure copper bars in switchgear, transformer connections, and substation busbars. The push toward grid modernization in Europe, North America, and Asia is creating multi-billion-dollar annual procurement demand for precision copper bus bars.
Large hydroelectric generators and emerging tidal/wave energy converters use copper bus bars in stator windings, excitation systems, and power collection networks. The durability and corrosion resistance of high-purity copper ensures decades of reliable operation in high-humidity, high-vibration environments.
The renewable energy sector is the fastest-growing end market for pure copper bars globally. Key market indicators confirm accelerating demand through 2030 and beyond.
Beyond conventional wiring, pure copper bars serve critical structural and functional roles across the entire renewable energy value chain. Here we analyze the most technically demanding use cases where material quality directly impacts system efficiency, safety, and longevity.
In utility-scale solar farms (50 MW–1 GW+), central and string inverters rely on laminated pure copper bus bars to manage thousands of amperes of DC and AC current. These bus bars must maintain dimensional stability across wide temperature cycles (−40°C to +85°C), resist oxidation in outdoor environments, and provide consistent low-resistance contact at bolted joints. Oxygen-free copper (OFC) grades such as C10100 are preferred for their superior conductivity and resistance to hydrogen embrittlement.
The nacelle of a modern 15 MW offshore wind turbine houses complex power electronics including full-power converters, transformers, and switchgear — all interconnected by precision copper bus bars. These components must withstand continuous vibration, salt-spray corrosion, and thermal cycling. Chromium-zirconium copper (C18150) bus bars offer a compelling combination of 80%+ IACS conductivity with significantly enhanced mechanical strength and softening resistance at elevated temperatures, making them ideal for high-current nacelle applications.
Grid-scale battery energy storage systems (BESS) ranging from 10 MWh to 500 MWh+ use copper bus bars at cell, module, rack, and container levels. At the cell interconnect level, ultra-thin pure copper bus bars (0.2–1.0 mm) must accommodate thermal expansion while maintaining low contact resistance over 6,000+ charge cycles. Tellurium copper (C14500) and oxygen-free tellurium copper (OFT) grades provide the ideal balance of machinability for precision punching/forming and electrical performance for this demanding application.
350 kW ultra-fast EV chargers require copper bus bars engineered to handle 500A+ continuous current with minimal voltage drop. The bus bars in charging cabinets must support reliable operation across millions of connection cycles, resist arc erosion at contact points, and maintain structural integrity under thermal stress. Pure copper bars with silver plating or tin plating at contact surfaces offer the optimal solution for high-reliability EV charging infrastructure deployment.
Offshore wind farms require offshore high-voltage substations (OHVS) to step up voltage from 66 kV to 220–400 kV for HVDC transmission. The switchgear and GIS (Gas Insulated Switchgear) within these substations use precision copper bus bars rated for 1,600–4,000A continuous service in a sealed, pressurized SF6 environment. The dimensional accuracy (±0.05 mm tolerance) and surface finish requirements for these components demand the highest-grade pure copper bar stock available.
Green hydrogen production via PEM (Proton Exchange Membrane) and alkaline electrolyzers represents one of the most rapidly growing applications for pure copper bus bars. Electrolyzer stacks operating at 1.6–2.0 V per cell require massive DC current supplies (up to 100,000 A for industrial-scale systems), distributed through precision copper bus bars with ultra-low resistance joints. The purity and dimensional consistency of these copper bars directly determines electrolyzer stack efficiency and hydrogen production cost.
A high-tech enterprise dedicated to advancing copper alloy materials for renewable energy and emerging industries.
Sichuan Kepai New Materials Co., Ltd., established in 2017, is a high-tech enterprise integrating research and development, production, and sales. The factory covers an area of approximately 9,000 square meters, with an office space of about 1,000 square meters.
The company primarily engages in the production of strategic emerging new materials for the national 13th Five-Year Plan, including special copper alloys such as tellurium copper, high-conductivity oxygen-free copper, silver copper, and dispersion copper, while also focusing on the research and development of high-conductivity, easy-to-machine, high-strength copper alloys.
The products are mainly applied in high-tech fields such as new energy vehicles, 5G technology, laser cutting, and lithium battery relays.
The company is located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, boasting a superior geographical location and convenient transportation, which lays a solid foundation for the rapid development of the enterprise.
Since its establishment, Kepai has adhered to the business philosophy of "innovation-driven development, quality wins the market," committed to providing customers with the highest quality high-end copper alloy materials, and promoting industrial upgrading and sustainable development. As the renewable energy sector demands ever-higher performance from conductive materials, Kepai's continuous R&D investment ensures our copper bar products remain at the forefront of technical capability and environmental responsibility.
Four pillars that make Kepai the preferred partner for pure copper bar supply in renewable energy systems worldwide.
Technological innovation is the core competitiveness of Sichuan Kepai New Materials Co., Ltd. The company has a research and development and production team composed of senior industry experts who keep pace with international cutting-edge technology trends and continuously explore the unknown boundaries in the field of new copper alloy materials. Through a combination of independent research and development and industry-university-research collaboration, Kepai has made breakthrough progress in several areas, including high-performance tellurium copper, lead copper, and sulfur copper. Many of its technological achievements have reached international advanced levels and have been successfully applied in various industries such as new energy vehicles, precision machining parts, plasma cutting, relays, and energy storage, earning widespread recognition and praise in the market.
Kepai's product line is rich and diverse, covering a comprehensive range of solutions from basic materials to high-end customization. We focus on providing customers with high-performance, high-quality high-end copper alloy products, including but not limited to pure copper, oxygen-free copper, oxygen-free high-conductivity tellurium copper, nickel tellurium copper, tin bronze, beryllium copper, lead bronze, sulfur copper, and chromium zirconium copper. These products play an important role in reducing production costs and enhancing product performance due to their excellent physical and chemical properties and environmental friendliness, creating significant economic and social benefits for customers.
In the face of global market competition, Sichuan Kepai New Materials adheres to the development strategy of "rooted in Sichuan, radiating nationwide, and moving towards the world." By continuously optimizing market layout and improving the sales network, we have established a stable customer base in multiple provinces and cities across the country and have formed long-term cooperative relationships with several internationally renowned enterprises. At the same time, the company actively expands into overseas markets, participates in international competition and cooperation, and strives to promote Kepai's brand influence on the global stage.
We understand that the long-term development of an enterprise is inseparable from an excellent corporate culture. We advocate the corporate spirit of "integrity, innovation, collaboration, and win-win," encouraging employees to explore boldly and innovate courageously, while also emphasizing teamwork and talent cultivation, striving to create a harmonious, open, and inclusive work atmosphere. We believe that only by continuously pursuing excellence and creating value can we win the trust of customers and the respect of society.
Our quality management systems and market reach are validated by internationally recognized certifications and a global distribution network serving renewable energy projects across Asia, Europe, and the Americas.
From precision smelting to rigorous quality testing, our state-of-the-art production and testing equipment ensures every pure copper bar meets the exacting standards demanded by renewable energy system integrators worldwide.
Smelting
Laying-off
Extrusion
Drawing
Straightening
Package
Eddy Current Conductance Instrument
Chemical Composition Test Room
Metallographic Sample Polishing Machine
Microcomputer Controlled Electro-hydraulic Servo Universal Testing Machine
Liquid Crystal Display Electronic Universal Testing Machine
Hardness Tester
Explore our full range of high-performance copper alloy materials engineered for solar, wind, storage, and EV charging applications.
Looking ahead, Sichuan Kepai New Materials Co., Ltd. will continue to uphold its original intention, with even greater enthusiasm and determination, to engage in research and application in the field of new materials, contributing to the development of the new copper alloy materials industry in China and globally. We look forward to working hand in hand with friends from all walks of life to create a brilliant future together!
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