Solar extension cable

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

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

Highlights at a glance

• Minimised voltage drop: The 6 mm² cross-section offers approximately 30% less resistance than 4 mm² cable, which is crucial for the yield over a length of 30 metres (60 metres total distance).
• Plug & Play installation: The cables are pre-fitted with MC4-compatible connectors at both ends, so no special crimping tools are required.
• Reliable identification: The clear colour-coding in red (+) and black (-) effectively prevents dangerous polarity mix-ups when laying the cable over such a long distance.
• Weatherproof & durable: The special cross-linked polyolefin sheath is UV-resistant, ozone-resistant and withstands extreme temperatures ranging from -40°C to +90°C.
• IP67 protection rating: When connected, the connectors are completely dust-tight and protected against temporary submersion (e.g. during heavy rain).
• High-quality conductor: Tinned electrolytic copper ensures maximum corrosion resistance and consistently excellent conductivity.

Areas of application

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

• Large ground-mounted systems
  • Ideal for positioning modules at the sun-exposed end of a large property, whilst the technical equipment is installed safely indoors.
• Agriculture & Outbuildings
  • Connecting distant barns, stables or garden sheds to the central feed-in point.
• Off-grid systems (24V / 48V)
  • Particularly with battery systems, a 6 mm² cross-section over 30 metres is essential to maintain a stable charging voltage and charge the battery efficiently.

Installation & Safety Instructions

• Cost-effectiveness from a distance
  • With a cable length of 30 metres, the extra cost of the 6 mm² cable often pays for itself within a short time due to the lower energy loss in the cable (less waste heat, more active power).
• Protection for underground installation
  • Although the cable is weatherproof, if it is laid in the ground, it must be routed through a protective conduit (e.g. a conduit or cable protection tube) to protect it from rodents and mechanical stress.
• Correct engagement
  • When connecting the cables, make sure that the MC4 connectors click audibly into place. This is the only way to ensure that the connection is permanently watertight and protected against dangerous arcing.

Features

FAQs on the 30m 6mm² solar extension cable

Is 6 mm² sufficient for 30 metres in a balcony power plant?

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

Do the connectors fit inverters from Growatt, Victron or Deye?

Yes. The connectors fitted comply with the global MC4 standard. They are a perfect mechanical and electrical fit for the connections on almost all standard solar modules and inverters.

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