Solar extension cable 3m 4mm² – red/black for reliable PV connections (set)

The solar extension cable set (3 metres, 4mm²) is the ideal solution for short distances within a photovoltaic installation. If you need to bridge short distances between your solar modules or want to connect to a nearby inverter or charge controller – for example, on a balcony, a garage roof or in the camping area – this set offers a secure and virtually loss-free connection.

The set includes two high-quality, double-insulated solar cables: one red cable for the positive terminal (+) and one black cable for the negative terminal (-). Both ends are professionally pre-assembled with MC4-compatible plugs and sockets. Thanks to the short length of 3 metres and the solid cross-section of 4mm², this set is ideally suited for almost all common PV applications (balcony systems, off-grid systems, roof systems).

Highlights at a glance

• Optimal short-distance solution: With 3 metres in length, ideal for connecting modules in a string or for direct connection of microinverters.
• Plug & Play installation: The cables are pre-assembled on both sides with MC4-compatible connectors, so that no special tools are required for crimping.
• Secure identification: The colour coding in red (+) and black (-) makes installation easier and effectively prevents incorrect polarity.
• Weatherproof & durable: The special jacket made from cross-linked polyolefin is UV-resistant, ozone-resistant and withstands extreme temperatures from -40°C to +90°C.
• Protection rating IP67: When plugged in, the connectors are absolutely dustproof and protected against splashing water and rain.
• High-quality conductor: Tinned electrolytic copper ensures excellent corrosion resistance and permanently high conductivity.

Areas of application

This 3-metre extension is designed for a wide range of application scenarios:

• Balcony systems
  • Perfect for bridging the distance between the solar modules and the microinverter mounted directly behind or below them.
• String cabling
  • Bridging gaps between rows of modules on pitched roofs or flat roof elevations.
• Motorhomes & boats
  • Connecting solar modules to the charge controller in compact spaces where long cable runs are not required.

Assembly & safety instructions

• Minimal voltage drop
  • With a length of only 3 metres, the voltage drop is negligibly small. For both 12V/24V off-grid systems and high-voltage systems, this cross-section is technically perfectly dimensioned for this length.
• Strain relief
  • Secure the cables with UV-resistant cable ties to the mounting frame. Avoid mechanical stress on the plug-in connections and the module junction boxes.
• Correct latching
  • When connecting, ensure that the MC4 connectors audibly snap into place. This is the only way the connection will remain permanently watertight and safe from arcing.

Features

FAQs about the solar extension cable 3m

Is 4mm² enough for my 800W balcony system?

Yes, absolutely. With 3 metres and a typical current of about 10–13 amperes, the resistance is so low that there are practically no measurable losses. 4mm² is standard here and is fully sufficient.

Can I also leave these cables outdoors?

Yes, that's what they're made for. The cables are certified according to standard PV norms. They are resistant to ammonia, ozone and UV radiation and can be used outdoors for decades.

Do the connectors fit modules from Trina, Jinko or JA Solar?

Yes. These manufacturers use MC4 or compatible systems (like EVO2) as standard. The connectors on this extension cable fit perfectly, both mechanically and electrically, to these module connectors.