Solar extension cable 8m 4mm² - red/black for efficient PV installations (set)

The solar extension cable set (8 metres, 4mm²) is the ideal solution for moderate distances within a photovoltaic installation. If you need to bridge the gap between your solar modules or connect to an inverter or charge controller nearby – for example on a balcony, garage roof or in the garden – this set offers a secure and efficient connection.

The set includes two high-quality, double-insulated solar cables: a red cable for the positive pole (+) and a black cable for the negative pole (-). Both ends are professionally pre-assembled with MC4-compatible plugs and sockets. Thanks to the compact cable length of 8 metres and robust cross section of 4mm², this set is technically an excellent choice for almost all common PV applications (balcony systems, off-grid systems, roof installations).

Highlights at a glance

• Optimum reach: With a length of 8 metres, ideal for connecting modules in a string or for connecting microinverters at moderate distances.
• Plug & Play installation: The cables are pre-assembled at both ends with MC4-compatible connectors, so no special crimping tool is required.
• Safe identification: The colour coding in red (+) and black (-) makes installation easier and effectively prevents polarity errors.
• Weatherproof & durable: The special cross-linked polyolefin sheath is UV-resistant, ozone-resistant and withstands extreme temperatures from -40°C to +90°C.
• IP67 rating: When plugged in, the connectors are completely dustproof and protected against splashing water and rain.
• High-quality conductor: Tinned electrolytic copper provides excellent corrosion resistance and permanently high conductivity.

Areas of application

This 8-metre extension is designed for a variety of scenarios:

• Balcony PV systems
  • Perfect for bridging the distance between solar panels and the inverter when the inverter is mounted slightly offset.
• String cabling
  • Bridging gaps between module arrays on pitched roofs or flat roof mounts.
• Motorhomes & camping
  • Connecting solar modules to the charge controller so the vehicle can be parked in the shade while the panels are in the sun.

Installation & safety information

• Minimal voltage drop
  • At 8 metres in length, the voltage drop is negligibly low. For both 12V/24V standalone systems and high voltage systems, this cross section at this length is technically optimal.
• Strain relief
  • Secure the cables to the mounting frame with UV-resistant cable ties. Avoid mechanical strain on the connectors and module junction boxes.
• Correct latching
  • When plugging together, make sure the MC4 connectors click audibly into place. Only then will the connection remain permanently watertight and safe against arcing.

Features

FAQs about the Solar Extension Cable 8m

Is 4mm² sufficient for my 800W balcony PV system?

Yes, absolutely. At 8 metres length and a typical current of around 10–13 amperes, there are practically no measurable power losses. 4mm² is the industry standard for this and is perfectly sufficient.

Can I leave these cables outdoors?

Yes, that’s what they’re designed for. The cables are certified to current PV standards. They are resistant to ammonia, ozone and UV radiation and can be used outdoors for decades.

Do the connectors fit modules from all common manufacturers?