DC Cables

This range covers 4mm, 6mm, 10mm, and 35mm cross-section solar cables in red and black, plus single-core earth wires in 6mm, 10mm, and 16mm yellow/green. Each size suits different string lengths, current ratings, and voltage drop tolerances. Larger cross-sections reduce resistance over longer cable runs, improving overall system energy performance significantly.

Cable selection depends on the maximum current your string or array produces and the total cable length between panels and inverter. As current increases or cable runs extend, a larger cross-section is required to keep voltage drop within acceptable limits. A 4mm cable suits shorter runs at lower current; 10mm or 35mm is appropriate for higher-output arrays or long distances.

Voltage drop is the reduction in electrical potential that occurs as current travels through a cable. In a solar system, excessive voltage drop between panels and the inverter reduces the power delivered, lowering overall yield. Selecting the correct cable cross-section for the run length and current rating keeps voltage drop below 1%, preserving system performance.

Tinned copper refers to copper conductors coated with a thin layer of tin. This coating resists oxidation and corrosion, which is particularly important in outdoor photovoltaic installations exposed to humidity, heat, and UV radiation over many years. Conductors made from high-purity tinned copper maintain low resistance and reliable conductivity throughout the cable's service life.

Single core DC cable carries current in one direction along a single conductor, making it the standard choice for photovoltaic string wiring. Red cables carry positive current from panels to the inverter; black cables carry the negative return. Yellow/green single wire serves as the earth conductor, bonding metal components to protect against fault currents and electric shock.

Cables should be secured using UV-resistant cable ties or clips, routed away from sharp edges, and protected inside conduit where they pass through walls or across rooftops with heavy foot traffic. Avoid bundling positive and negative cables tightly together over long distances, as this can increase inductance. Always use the correct current rating and observe minimum bend radius to prevent insulation damage.

Standard electrical cables are designed for AC circuits at fixed indoor or buried installation conditions. Solar DC cables differ in their double insulation layer, higher voltage rating, UV and heat resistance, and tinned copper conductors. Using standard wiring in a photovoltaic system creates safety risks and may void equipment warranties; certified solar cable is always the correct choice for any PV installation.