Photovoltaic (PV) Wire Guide: High-Voltage Solutions for Solar Arrays

In solar installations, the wiring that connects the modules to the inverters is the most exposed, critical link in the entire system. This wiring must withstand constant UV exposure, extreme temperatures, and moisture for decades while maintaining optimal power transfer.

Solar Photovoltaic (PV) Wire is a dedicated single-conductor cable specifically designed to meet these harsh requirements, typically carrying the UL certification PV Wire per UL4703 or USE-2/RHH/RHW-2.

Here is some information engineers, solar installers, project managers and home owners should know before selecting the correct PV Wire (Copper or Aluminum) for your project.  

1. Unified Technical Specs & Compliance (Both CU and AL)

Both our Copper and Aluminum PV Cables are engineered to meet the same stringent compliance requirements for interconnection wiring of grounded and ungrounded photovoltaic power systems.

• High Voltage Capacity: Both types of PV cable are rated for applications up to 2000 Volts DC, which is necessary for modern, high-efficiency systems.

• NEC Cable Tray Compliance: Both cables meet the critical requirement for installation in outdoor cable trays. When installed in accordance with NEC Article 690.31(C)(2) (Photovoltaic Systems), PV source and PV output circuits using single-conductor cables of all sizes can be installed in outdoor cable trays. This simplifies installation and reduces conduit costs.

• Standard Temperature Rating: Both conductors are rated for continuous temperatures from -40°C to 90°C in wet or dry conditions.

• UL Ratings: Both conductors are UL listed PV Wire per UL4703 & RHH RHW-2 USE-2 per UL 44, UL 854

2. Construction and Durability

PV wire features construction optimized for flexibility, ease of connection, and long-term durability in solar environments.

• Insulation Material: High-performance insulation, often XLPE (Cross-Linked Polyethylene), is used for its superior temperature and moisture resistance.

• Stranded Conductors: All PV wire uses finely stranded conductors (Class B or Class C stranding). This is essential for flexibility when making tight bends and routings during installation.

• UV Resistance: The insulation must be Sunlight Resistant. This is a critical requirement for all exposed rooftop and ground-mount installations, ensuring the jacket does not crack or degrade under constant ultraviolet radiation.

3. Key Applications for Solar PV Wire

• Module Interconnection: Running conductors from the solar panels to the combiner box or string inverter.

• Inverter Feeders: Connecting the array's output (either DC or AC) to the main service panel or transformer.

• Utility-Scale and Commercial Arrays: Used in all stages of fixed-tilt and tracker-based solar installations.

4. Why Buy Solar Photovoltaic PV Wire?

The specialized construction of PV Wire is not optional—it is a mandatory investment in system longevity and safety. Choosing this dedicated cable ensures reliable power transfer and protects your entire array over its 25-year lifespan. The choice between Copper and Aluminum comes down to balancing material cost against installation needs.

Wire America is proud to offer this product by the foot or by the spool with fast shipping to your location.

Click Here to Shop Our Solar Photovoltaic PV Wire Selection

At Wire America, we believe in genuine conversation. You'll always talk with real people who understand that every project requires careful product selection. We're here to ensure you feel educated, confident, and great about your final purchase. Feel free to give us a call to discuss your project! You can reach us at: 833-268-8644

⚠️ Important Disclaimer: Safety and Compliance

Wire America provides this information as a guide only. Electrical installations must strictly adhere to the National Electrical Code (NEC) and all state, local, and jurisdictional requirements, which vary widely. Always consult a licensed electrician, electrical engineer, or the local inspecting authority before purchasing material or starting any electrical project. Wire America assumes no liability for the installation, use, or interpretation of these guides.