Solar power systems rely on two very different electrical environments: the direct current (DC) side that runs from the panels to the inverter, and the alternating current (AC) side that feeds the grid or the building. Because these circuits behave differently, the cables that carry them cannot simply be swapped. A DC solar cable is purpose-built for outdoor photovoltaic (PV) wiring, while a standard AC cable is designed for indoor power distribution. Choosing the wrong one is a common and costly mistake.
Photovoltaic cables carry direct current at up to 1.8kV DC and are constantly exposed to sunlight, rain, ozone and temperature swings from -40°C to +90°C. A TUV-certified PV1-F cable therefore uses a fine-stranded tinned copper conductor, dual layers of cross-linked XLPE insulation, and a halogen-free, flame-retardant sheath that resists UV degradation, water, oil and chemicals.
| Feature | DC Solar Cable | Standard AC Cable |
|---|---|---|
| Typical voltage | 1000V / 1800V DC | 300/500V or 0.6/1kV AC |
| Conductor | Tinned copper, fine stranded | Plain copper |
| Insulation | Double XLPE, halogen free | PVC |
| UV & weather resistance | Excellent (outdoor rated) | Poor (indoor use) |
| Temperature range | -40°C to +90°C | 0°C to +70°C |
| Certification | TUV / EN50618 | Basic CE |
DC solar cables are found on rooftops and ground-mount solar farms, connecting panel strings to combiners, inverters and battery banks. Their double insulation and UV stability suit exposed outdoor runs. Standard AC cables belong indoors—inside walls, conduits and distribution boards—where weather is not a factor.
Never. Using a standard AC cable on the DC side of a PV array risks overheating, insulation cracking and fire. Only a certified DC solar cable, sized to the system's rated current and voltage, should be used.
Understanding the difference between DC solar cable and AC cable protects both your installation and your investment. Always insist on certified, UV-resistant PV cable.
