Solar extension cable 45m 6mm² - red/black for reliable PV applications (set)

The solar extension cable set (45 metres, 6mm²) is the specialised solution for photovoltaic projects with extreme distances. If your solar modules need to be positioned in the sunniest part of the property – for example, at the end of a very large garden or on a distant barn – and the inverter is centrally located in the building, this generous cross-section of 6mm² provides the necessary capacity to effectively minimise power losses across the full 45-metre distance.

The set contains 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. Thanks to the substantial cross-section, this set is especially future-proof and ideal for modern high-performance modules, where standard cables (4mm²) would already show significant losses in efficiency over such an enormous distance.

Highlights at a glance

• Optimised for long distances: The 6mm² cross-section considerably reduces electrical resistance, which is crucial for high levels of energy yield at 45 metres (90m round-trip distance).
• Plug & Play installation: The cables are pre-assembled on both ends with MC4-compatible connectors, so no special crimping tools are required.
• Secure identification: The clear colour coding in red (+) and black (−) effectively prevents dangerous polarity mix-ups on this extremely long cable run.
• Weatherproof & durable: The special cross-linked polyolefin sheath is UV-resistant, ozone-resistant, and withstands extreme temperatures from −40°C to +90°C.
• IP67 protection rating: The connectors are absolutely dust-tight and protected against temporary immersion (e.g., during heavy rain) when plugged in.
• High-quality conductor: Tinned electrolytic copper provides maximum corrosion resistance and lasting excellent conductivity even under challenging conditions.

Areas of application

This 45-metre extension is designed for demanding long-range links:

• Large open-area systems
  • Ideal for locating modules far away in a garden or meadow, where there is no shading from buildings.
• Annexe buildings & agriculture
  • Connecting remote garages, carports or barns to the main building or central meter cabinet.
• Off-grid systems (24V / 48V)
  • In particular for battery systems, the 6mm² cross-section over 45 metres is essential to maintain charging voltage stability and keep losses low.

Assembly & safety information

• Efficiency over distance
  • With 45 metres of cable length, 6mm² offers a significant advantage over 4mm². Lower resistance results in higher system voltage at the inverter and thus measurably greater yield over the years.
• Protection when buried
  • Although the cable is weatherproof, if it is to be laid underground it must always be run in a suitable protective conduit to protect it from mechanical effects and rodents.
• Correct latching
  • When connecting, make sure the MC4 connectors click audibly into place. Only then will the connection be reliably waterproof and safe from dangerous arcing.

Features

FAQs about the solar extension cable 45m 6mm²

Why is 6mm² at 45 metres better than 4mm²?

Due to the lower voltage drop. Over a total distance of 90 metres (to and fro), the electrical resistance adds up. A 6mm² cable reduces this resistance by around a third compared to a 4mm² cable, which can mean several percent more yield for typical balcony power systems or module strings.

Do the connectors fit my inverter from Hoymiles, Deye or Growatt?

Yes. The supplied connectors meet the global MC4 standard. They fit mechanically and electrically without issue to almost all standard solar modules and inverters.

Can I shorten the cable if 45 metres is too long?