The core function of photovoltaic DC cables is to transmit the DC power generated by solar modules and ensure long-term stable and safe operation in harsh outdoor environments.
They are mainly used to connect DC-side equipment in photovoltaic systems, specifically including:
Series connection between modules
Connection between strings and inverters
Parallel connection between strings and DC distribution boxes (combiner boxes)
Connection from DC distribution boxes to inverters. These cables need to be exposed to harsh environments such as high temperatures, ultraviolet radiation, humidity, sandstorms, and drastic temperature changes for extended periods.
Therefore, they use tin-plated oxygen-free copper conductors and irradiated cross-linked polyolefin insulation sheath materials, possessing excellent weather resistance, UV resistance, high and low temperature resistance (-40℃ to 90℃ or even higher), and low-smoke halogen-free flame-retardant properties.
Compared to ordinary cables, photovoltaic DC cables have stronger resistance to potential-induced degradation (PID) and higher insulation withstand voltage ratings (such as DC 1100V or DC 1500V), effectively reducing line losses, improving system power generation efficiency, and ensuring reliable operation for over 25 years, the same lifespan as photovoltaic modules.
Furthermore, their double-layer insulation structure and color coding (red for positive, black for negative) enhance installation safety and maintenance convenience.
