Solar extension cable 30m 6mm² - red/black for reliable PV applications (set)

The solar extension cable set (30 metres, 6mm²) is the professional solution for photovoltaic projects that require maximum efficiency over very long distances. If your solar modules are installed on a remote open space, a carport or a barn and the distance to the inverter is 30 metres, this generous cross-section of 6mm² offers the necessary capacity to effectively minimise power losses.

The set includes two high-quality, double-insulated solar cables: one red cable for the positive pole (+) and one black cable for the negative pole (-). Both ends are professionally pre-assembled with MC4-compatible plugs and sockets. Whereas a 4mm² cable already reaches its efficiency limits at a length of 30 metres, the 6mm² variant guarantees a more stable voltage and thus a higher overall yield from your system.

Highlights at a glance

• Minimised voltage drop: The cross-section of 6mm² offers approximately 30% less resistance than 4mm² cables, which is decisive for the yield for a length of 30 metres (60m total path).
• Plug & Play installation: The cables are fully pre-assembled with MC4-compatible connectors on both sides, so no special crimping tool is required.
• Safe identification: The clear colour coding in red (+) and black (-) effectively prevents dangerous polarity mix-ups over this long distance during installation.
• Weatherproof & durable: The special sheath, made of cross-linked polyolefin, is UV-resistant, ozone-resistant and withstands extreme temperatures from -40°C to +90°C.
• Protection class IP67: The connectors are absolutely dustproof and protected against temporary submersion (e.g. in heavy rain) when plugged together.
• High-quality conductor: Tinned electrolytic copper ensures maximum corrosion resistance and permanently excellent conductivity.

Areas of application

This 30-metre extension is optimised for demanding long-distance connections:

• Large ground-mounted systems
  • Ideal for positioning modules at the shade-free end of a large plot while the technology is protected indoors.
• Agriculture & outbuildings
  • Connecting distant barns, stables or garden sheds to the central feed-in point.
• Stand-alone systems (24V / 48V)
  • For battery systems in particular, the 6mm² cross-section over 30 metres is essential to keep the charging voltage stable and efficiently charge the battery.

Assembly & safety instructions

• Efficiency at a distance
  • With a cable length of 30 metres, the extra cost for 6mm² often pays for itself in a short time due to the reduced energy loss in the cable (less heat, more active power).
• Protection for underground installation
  • Although the cable is weatherproof, it must be laid in a protective conduit (e.g. empty conduit or cable protection pipe) when laid in the ground to protect it from rodents and mechanical pressure.
• Correct latching
  • When connecting, make sure you hear the MC4 connectors engage audibly. Only then is the connection permanently watertight and safe against dangerous arcing.

Features

FAQs about the solar extension cable 30m 6mm²

Is 6mm² sufficient for 30 metres for a balcony power station?

Yes, it is the recommended choice. While a 4mm² cable at this length can already cause losses of approximately 6-8% (depending on current), the 6mm² cable significantly reduces this loss. It is the technically most sensible solution for this distance.

Are the connectors compatible with inverters from Growatt, Victron or Deye?

Yes. The connectors used comply with the worldwide MC4 standard. They fit perfectly mechanically and electrically to the terminals of almost all common solar modules and inverters.

Can I shorten the cable if 30m is too long?