Solar wire is specially formulated electrical conductor rated for direct burial and outdoor exposure in photovoltaic systems. Unlike standard THHN copper wire, solar wire features tinned copper strands and UV-resistant insulation rated to 90°C under normal conditions. Common sizes include 10 AWG, 8 AWG, and 6 AWG, with ampacity ratings that vary between 30 to 65 amps depending on wire gauge and environmental temperature derating factors.
Material Composition
Solar wire must comply with UL 4703 standards, featuring chlorine-free, cross-linked polyethylene (XLPE) insulation that resists cracking in intense UV conditions. The tinned copper construction prevents corrosion in high-moisture environments and extends wire lifespan significantly compared to bare copper alternatives used in traditional electrical systems.
System Integration
Solar wire connects photovoltaic modules to combiner boxes, inverters, and disconnect switches throughout the array. Proper wire sizing prevents voltage drop beyond 3% in DC circuits and 5% combined AC/DC systems, maintaining optimal energy conversion efficiency and system performance across all weather conditions and temperature ranges.