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6mm² single core is the size most installers settle on for the DC side, because it is the one that survives distance. 46 A of capacity, and 7.3 mV/A/m against 11 on 4mm² — a third less voltage lost per metre, which is what you are buying when the array is on the roof and the inverter is two floors down in a store room. Class 5 flexible copper, 84 strands of 0.30 mm, 3.30 Ω/km. Drawn on the Pilone line in Lahore.
Prices track the daily copper rate. Bulk and coil pricing on request.
Check the coil before you pay for it
Every coil leaves our factory with a QR code printed on the packaging. Scan it and the factory record for that batch opens: brand, cable size, batch number, year of manufacture and conductor. Compare the batch number on screen with the one printed on your coil — if the two do not match, it did not come from us.
| Property | Value |
|---|---|
| Conductor | Plain annealed copper, class 5 flexible stranded |
| Nominal area | 6 mm² × 1 core |
| Strand construction | 84 / 0.30 mm (typical) |
| Max conductor resistance at 20°C | 3.30 Ω/km |
| Current capacity (single conductor, DC reference) | 46 A |
| Voltage drop | 7.3 mV/A/m |
| Voltage rating | 1000 V DC |
| Insulation / sheath | PVC / PVC, 70°C conductor rating |
| Conductor copper weight | ≈ 53.3 kg/km |
| Reference standards | IEC 60228 (conductors), IEC 60227 (PVC cables) |
Worked example, from the voltage-drop figure in the table. A 20 A DC feed over a 40 m route from a rooftop array down to the inverter loses 20 × 40 × 7.3 ÷ 1000 = 5.8 V. The tabulated 7.3 mV/A/m covers both legs of the circuit, so the route length counts once, not twice. The same run on 4mm² would lose 20 × 40 × 11 ÷ 1000 = 8.8 V — three volts more, for the sake of about 18 kg less copper per kilometre (53.3 against 35.6). Once a DC run passes roughly 30 m it is the drop, not the amps, that picks the size.
The positive and negative pair from a roof array down to an inverter on a lower floor, where the metres force the size before the current does.
Two or three strings joined into one run, 24–36 A, still inside the 46 A this conductor carries.
Ground-mount and commercial rooftop arrays where the DC side is longer and the current higher than a house system.
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