Solar DC Cable Price in Pakistan 2026 — 4mm & 6mm Buyer's Guide | CNC Electric
Solar DC cable is the most under-specified component in Pakistani solar installations. Standard household AC cable is regularly (and dangerously) used on solar PV strings, where the constant DC current, exposure to UV / heat, and lack of zero-crossing make it a fire risk. This guide explains why solar DC cable is fundamentally different from AC cable, how to size 4 mm² vs 6 mm² vs 10 mm² for your system, and what CNC stocks — 100-meter rolls of UV-resistant tinned-copper DC cable in red and black at Rs. 35,000 to Rs. 50,000.
Solar DC Cable Price in Pakistan 2026 — CNC Stock
| Cross-Section | Colour | Roll Length | Per-Meter Cost | Roll Price (PKR) |
|---|---|---|---|---|
| 4 mm² (4mm) | Red (PV+) | 100 m | Rs. 350 / m | Rs. 35,000 |
| 4 mm² (4mm) | Black (PV−) | 100 m | Rs. 350 / m | Rs. 35,000 |
| 6 mm² (6mm) | Red (PV+) | 100 m | Rs. 500 / m | Rs. 50,000 |
| 6 mm² (6mm) | Black (PV−) | 100 m | Rs. 500 / m | Rs. 50,000 |
Free delivery across Pakistan. Tinned copper conductor, XLPE insulation, UV-resistant outer jacket, double-insulated. Suitable for direct sun exposure on rooftop installations. Stocked in 100-meter rolls — quantities below 100 m available on request. View product → | WhatsApp +92 326 1111376.
What Is Solar DC Cable?
Solar DC cable — sometimes called "PV cable" or "solar wire" — is a specialised electrical cable designed specifically for connecting solar photovoltaic panels to the rest of the system. Three things make it different from standard household AC cable:
- UV / weather resistance: the outer jacket is engineered to survive 25+ years of direct sun, rain, and Pakistani heat (50+ °C panel-back temperatures). Standard PVC household cable cracks and disintegrates within 2-3 years of rooftop exposure.
- Tinned-copper conductors: the copper strands are tinned (coated with a thin layer of tin) to prevent oxidation in humid and salty air. Bare-copper household cable develops green corrosion at solar junction boxes within a year.
- Double insulation: two separate insulation layers (typically XLPE inner + UV-resistant outer) for safety on DC circuits where a single insulation failure could create a continuous fault current.
The standard international specification is EN 50618 / IEC 62930 — sometimes printed on the cable jacket as "H1Z2Z2-K". CNC solar DC cable meets these specifications.
AC Cable vs DC Cable — Are They the Same?
| Feature | Standard AC Cable | Solar DC Cable |
|---|---|---|
| Voltage rating | 450 / 750 V AC | 1500 V DC |
| UV resistance | None (degrades in sun) | 25+ year UV-resistant jacket |
| Conductor | Bare copper | Tinned copper |
| Insulation | Single PVC layer | Double XLPE + UV jacket |
| Temperature range | -15 to +70 °C | -40 to +120 °C |
| Service life outdoors | 2-3 years | 25+ years |
| Used for | Indoor wiring, AC circuits | Solar PV, battery banks, DC industrial |
The biggest difference is service life under sun. Standard household cable run on a rooftop solar array becomes brittle within 2-3 years, the insulation cracks, and the bare conductor eventually shorts or earths. Solar DC cable is engineered to last the 25-year warranty life of the panels themselves.
Can I Use AC Cable for DC Application?
For indoor protected runs at low current — sometimes, with caveats. For rooftop solar installations or any outdoor / sun-exposed run — no, never.
The two main risks of using AC cable on DC:
- UV degradation: The PVC outer jacket of standard cable degrades under UV. Within 2-3 years of rooftop exposure, the jacket cracks and the conductor is exposed. This causes ground faults, short circuits, and roof fires.
- Voltage rating mismatch: Solar strings of 16-24 panels in series reach 800-1200 V DC. Standard household cable is rated 450/750 V — sufficient for AC where peak voltage is √2 × 220 = 311 V, but inadequate for DC where the rated voltage is the continuous operating voltage. Operating at twice the rated voltage breaks down the insulation over time.
For battery bank wiring (indoor, low-voltage 12-48 V DC, short runs), heavy-duty single-core flexible cable is acceptable as long as ampacity is sized for the DC current. For anything between solar panels and the inverter — always use proper solar DC cable.
4 mm² vs 6 mm² vs 10 mm² — Which Size Do I Need?
Solar DC cable sizing depends on the string current (Isc), the run length, and the acceptable voltage drop. Two factors set the minimum size:
- Ampacity: the cable's maximum continuous current rating in outdoor conditions. Must exceed 1.25 × string Isc.
- Voltage drop: the resistive loss along the cable. Should be below 2% of the string voltage for inverter performance.
| Cable Size | Ampacity (outdoor) | String Current | Run Length (≤ 2% drop) | Typical Use |
|---|---|---|---|---|
| 2.5 mm² | ~32 A | up to 25 A | ≤ 5 m | Module-to-module jumpers only |
| 4 mm² | ~41 A | up to 32 A | ≤ 15 m | Most residential strings (≤ 10 kW) |
| 6 mm² | ~52 A | up to 40 A | ≤ 25 m | Longer residential, mid-commercial |
| 10 mm² | ~70 A | up to 55 A | ≤ 40 m | Commercial, long runs to inverter |
| 16 mm² | ~94 A | up to 75 A | ≤ 60 m | Utility-scale, very long runs |
For a typical 5 kW Pakistani residential installation (12 panels in 1 string, ~12 A Isc, 10-15 m cable run from rooftop to inverter), 4 mm² is the right size. Step up to 6 mm² for longer runs, multiple parallel strings, or 10 kW+ systems.
Solar Cable Colour Code — Red and Black
Pakistani and international convention for solar PV wiring:
- Red cable — Positive (PV+) — the leg with higher potential relative to ground, runs from the panel's + terminal through the combiner to the inverter PV+ input.
- Black cable — Negative (PV−) — the lower-potential leg, runs from the panel's − terminal through the combiner to the inverter PV− input.
Using the correct colour code is critical for two reasons: (1) electricians servicing the system can immediately identify polarity without testing; (2) reversed polarity at the inverter input typically destroys the inverter's MPPT power-stage. Always order both red and black cable in equal quantities.
How to Calculate Cable Length for Your System
- Measure the run distance from the panel junction box to the combiner box, and from the combiner to the inverter. Multiply by 2 (you need both PV+ and PV− cables).
- Add 10-15% margin for routing through cable trays, conduit bends, and termination loops.
- For 5 kW residential (single string, 15 m one-way to inverter): 15 × 2 (red + black) × 1.15 = ~35 m. Order one 100-meter roll of each colour for flexibility.
- For 10 kW residential (2 strings, 15 m one-way): 15 × 4 cables × 1.15 = ~70 m of each colour.
- For 25 kW commercial (4 strings, 25 m one-way): 25 × 8 cables × 1.15 = ~230 m of each colour.
CNC stocks 4 mm² and 6 mm² in 100-meter rolls. For commercial systems requiring 200 m+ per colour, order multiple rolls — same-day dispatch from Lahore.
MC4 Connectors & Termination
Solar DC cable terminates at MC4 connectors — the standard industry-wide push-and-click plug used on every modern solar panel. Each cable end gets either a male or female MC4 connector crimped on. Use the correct crimping tool — a generic pliers crimp will work loose under thermal cycling and cause arcing.
For combiner-box and inverter terminations, the cable is stripped and bolted into screw terminals. Always tighten to the manufacturer's torque specification (typically 1.5-3 Nm for 4-6 mm² cable on 6 mm² terminal blocks). Under-torque causes loose connections that overheat; over-torque crushes the conductor strands.
Where to Install & Routing Best Practices
Rooftop runs: Use UV-rated cable trays or solar-rated conduit. Avoid running cable directly on the roof surface where it can be damaged by foot traffic or maintenance work. Secure with stainless steel cable ties every 600 mm.
Wall penetrations: Use proper IP65-rated wall glands. Avoid direct conduit-to-wall holes without sealing — water ingress is the #1 failure mode of rooftop solar installations.
Cable separation: PV+ and PV− should be run as twisted pairs to minimise induced loop area (helps with lightning surge protection). Avoid running solar DC cable parallel to AC supply cable for more than 1 m — induced voltages can damage MPPT controllers.
Combiner-to-inverter run: Use proper UV-rated trunking from the combiner box (typically rooftop) down the side of the building to the inverter location (typically indoor or shaded outdoor wall). This is the longest cable run in most residential systems.
CNC vs Pakistan Cables vs Fast Cables — Brand Comparison
| Brand | Origin | UV Rated | Conductor | Voltage Rating | 6 mm² Price per Meter |
|---|---|---|---|---|---|
| CNC Solar DC Cable | Imported, Lahore-stocked | Yes (25-yr) | Tinned copper | 1500 V DC | Rs. 500 |
| Pakistan Cables | PK manufacturer | Some lines | Bare/tinned | 1500 V DC | Rs. 450 – 600 |
| Fast Cables | PK manufacturer | Some lines | Bare/tinned | 1500 V DC | Rs. 480 – 650 |
| Newage | PK manufacturer | Some lines | Bare/tinned | 1500 V DC | Rs. 400 – 550 |
| GM Cables | PK manufacturer | Mixed | Bare | Often 750 V (not solar-rated) | Rs. 320 – 420 |
| Imported (LAPP, Helukabel) | European premium | Yes (TÜV) | Tinned | 1500 V DC | Rs. 800 – 1,500 |
Critical: when ordering "solar cable" from local manufacturers, always verify the UV rating and conductor type. Many cheaper offerings use bare copper conductor under a thin PVC jacket and call themselves "solar" — they are not. Look for the EN 50618 / IEC 62930 marking on the cable jacket. CNC ships with full traceability documentation.
Bulk & Installer Pricing
CNC solar DC cable is stocked in 100-meter rolls in Lahore with same-day dispatch nationwide. Solar installer dealer rates for 10+ rolls. Custom lengths (50 m, 200 m, 500 m) on request — typically 5-day lead time. Solar contractor bundles (cable + MC4 connectors + DC breakers + SPD) priced together. WhatsApp +92 326 1111376 with system size and quantity.
Frequently Asked Questions — Solar DC Cable Pakistan
What is solar DC cable?
Solar DC cable is a UV-resistant, double-insulated electrical cable engineered for connecting solar photovoltaic panels to the rest of a solar system. It uses tinned copper conductors and an outer jacket designed to survive 25+ years of direct sun exposure. The international specification is EN 50618 / IEC 62930.
What is the price of solar DC cable in Pakistan?
CNC 4 mm² solar DC cable: Rs. 35,000 per 100-meter roll (Rs. 350 per meter). CNC 6 mm² solar DC cable: Rs. 50,000 per 100-meter roll (Rs. 500 per meter). Both available in red (PV+) and black (PV−). Premium European brands (LAPP, Helukabel) cost Rs. 800 – 1,500 per meter for equivalent specifications.
Can I use AC cable for DC solar application?
No — not for outdoor rooftop runs. Standard AC cable lacks UV resistance and degrades within 2-3 years of sun exposure. It is also typically rated only 450/750 V, while solar strings can reach 1200 V DC. Always use proper solar DC cable for any run between panels and inverter. For indoor short-run battery wiring at low voltage, heavy-duty AC cable is acceptable with proper ampacity sizing.
What is the difference between AC and DC cable?
AC cable is designed for indoor wiring at 450/750 V with a single PVC insulation layer and bare copper conductor — 2-3 year outdoor service life. Solar DC cable is designed for outdoor PV use at 1500 V DC with double XLPE insulation, UV-resistant jacket, and tinned copper conductor — 25+ year service life. Different voltage rating, different insulation, different conductor protection.
What size solar DC cable do I need?
For most residential 5 kW Pakistani installations (single string, 12 A Isc, 10-15 m run), 4 mm² solar DC cable is sufficient. Step up to 6 mm² for runs over 15 m, multiple parallel strings, or 10 kW+ systems. Use 10 mm² for commercial systems with long runs to a centralised inverter. Match cable ampacity to 1.25 × string Isc minimum, keeping voltage drop below 2%.
What is the difference between 4mm and 6mm solar cable?
4 mm² has ~41 A ampacity and supports runs up to ~15 m at 12 A string current with < 2% voltage drop — ideal for typical 5 kW residential. 6 mm² has ~52 A ampacity and supports runs up to ~25 m — ideal for longer residential runs, 10 kW+ systems, or parallel-string commercial. The cost difference is roughly 40% (Rs. 350/m vs Rs. 500/m).
What is the colour code for solar DC cable?
Pakistani and international convention: Red cable for Positive (PV+), Black cable for Negative (PV−). Always order both colours in equal quantities. Correct colour-coding is critical for safe servicing — reversed polarity at the inverter input typically destroys the MPPT power stage.
How many meters of solar DC cable do I need?
Measure the run distance from panel junction box to combiner box and from combiner to inverter. Multiply by 2 (you need both PV+ and PV−). Add 10-15% routing margin. For 5 kW residential with 15 m one-way: ~35 m total per colour. For 10 kW with 2 strings: ~70 m per colour. CNC stocks 100-meter rolls — order one roll of each colour for typical residential systems.
Is solar DC cable safe for buried installation?
Yes — for direct burial below frost line, the CNC solar DC cable is rated for damp / wet conditions. However, for buried runs longer than 5 m, run the cable through proper UV-rated conduit for mechanical protection. Always provide a pull-box every 10 m for future serviceability. Mark the cable route on as-built drawings for safe excavation later.
How long does solar DC cable last?
The CNC solar DC cable carries a 25-year service life rating in outdoor exposed installations — matching typical solar panel warranty periods. The UV-resistant jacket is the key durability component. Cables run inside conduit or buried last even longer (often 30+ years). Cheap "solar" cables with non-UV-rated jackets typically fail in 3-5 years of Pakistani rooftop exposure.
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