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Custom Solar Cable Assemblies and Wire Harnesses

Solar Cable

As renewable energy becomes increasingly prevalent worldwide, the demand for specialized, reliable solar cable assemblies and wire harnesses grows to meet the unique requirements of the solar industry.

Romtronic is dedicated to providing high-quality solar cable assemblies and wire harnesses designed to withstand outdoor conditions, high UV exposure, high voltage, and high temperatures typical of solar applications, helping to power a sustainable future.

Professional Solar Industry Services

We understand that the success of solar photovoltaic (PV) power plants depends on reliable, efficient, and durable performance. By choosing Romtronic as your partner, you will benefit from our precision solutions and decades of solar industry experience. All our products comply with RoHS standards, ensuring they are safe for global use. Our solar wire harnesses are ETL-certified and undergo various performance tests before leaving the factory to ensure quality and reliability.

Our customized solar wiring harness assemblies
Our customized solar wiring harness assemblies

Optimizing Costs and Enhancing Efficiency

Our pre-assembled cable harnesses and partially automated production processes produce ready-to-install products that reduce on-site labour costs and installation errors, ensuring optimal PV system efficiency. Additionally, our pre-assembled collector harness products lower installation costs and save time and money by minimizing the need for troubleshooting and corrections during operation.

Product Advantages

Our solar wire harness solutions offer the following advantages:

  • Quick and Easy Installation
  • Replaceable In-line Fuse Holders
  • ETL Standard Certification, Supporting up to 1500V
  • Reduced Cable and String Connections
  • TPV Material Overmolding for Superior Waterproofing
  • Customizable Cable Lengths and Connectors

Technical Guide to Solar Cables

Solar cables are critical components in solar systems, connecting solar panels to other parts of the PV system. Our solar cables are UV-resistant, weatherproof, and capable of withstanding extreme temperatures, ensuring reliability and durability in harsh environments.

Types and Applications of Solar Cables

PV systems convert sunlight into electricity through solar panels but rely on specialized cables to transmit power. The main types of cables used are PV Wire, USE-2 Wire, and THHN Wire, each suitable for different applications due to their unique constructions.

PV Wire

PV Wire is commonly used for interconnection wiring in PV systems. Key features include:

  • Conductors: Bare or tinned copper
  • Insulation: XLPE
  • Voltage Ratings: 600V, 1000V, or 2000V
  • Temperature Range: +90°C (wet) and +150°C (dry)
  • Applications: Suitable for grounded and ungrounded PV arrays, direct burial
  • Standard: UL 4703 compliant

USE-2 Wire

USE-2 Wire is designed specifically for grounded PV arrays with the following characteristics:

  • Conductors: Aluminum, bare, or tinned copper
  • Insulation: XLPE
  • Voltage Rating: 600V
  • Temperature Range: +90°C (dry and wet)
  • Applications: Crush and impact-resistant, ideal for industrial applications
  • Standard: UL 854 compliant


THHN Wire is a building wire commonly used for power transmission:

  • Conductors: Bare copper
  • Insulation: PVC
  • Voltage Rating: 600V
  • Temperature Range: +90°C (dry) and +75°C (wet)
  • Applications: Not suitable for applications requiring USE-2 or PV Wire
  • Standard: UL 83 compliant

Choosing the appropriate cable size is crucial for the safe and efficient operation of solar systems. We offer a variety of cable sizes and specifications to meet the needs of different systems, including connections between inverters, batteries, charge controllers, and solar panels.

Custom Solar Solutions

Whether for residential or commercial applications, our solar cables and harnesses can be customized to your specific requirements. Our product range includes:

  • MC4 Locking Connectors
  • SOLARLOK® Solar Connectors
  • MC3 Non-locking Connectors
  • Battery Connection Cables
  • Battery to Inverter Cables
  • Tray Cables
  • Solar Panel Extension Cables
  • Adapter Cables

High-Quality Manufacturing and Rigorous Testing

We are committed to delivering high-quality products. All our manufacturing processes comply with UL and CSA standards and take place in China, adhering to ISO and RoHS standards. Our production process is highly automated and intelligent, significantly improving production efficiency and product quality. Every product undergoes 100% inspection and digital marking to ensure reliability.


With 27 years of professional experience, Romtronic provides high-quality solar cable assemblies and wire harness solutions to meet the growing demand for renewable energy. Regardless of your solar system application, we offer customized, high-performance cable assemblies to ensure the long-term safety and efficient energy conversion of your system.

Contact us to learn more about our custom solar cable assemblies and wire harness products, and let’s work together to advance the future of renewable energy.