Voldt Booster EV Set

No noticeable power loss, even with longer cables

No, Voldt charging cables do not experience any significant power loss due to their length. Voldt uses only high-quality copper conductors with low resistance, ensuring that even longer cables (such as 10 or 15 metres) can efficiently transmit current without noticeable voltage drop. The cables are designed according to international standards (such as IEC 61851 and IEC 62196), which specify maximum allowable voltage drop and heat development, so charging performance remains optimal.

Optimal conductor size prevents voltage drop

In theory, longer charging cables could lead to some power loss, particularly if the cable has a thin conductor or is made from lower-quality materials. Voldt prevents this by using conductors with appropriate cross-sectional area depending on the cable’s maximum current rating (e.g. 6 mm² for 32A 3-phase cables). This keeps voltage drop to negligible levels—typically less than 1%—which is well within regulatory limits. This is crucial for both safety and charging efficiency.

Tested for performance and safety

Finally, all Voldt cables are rigorously tested for electrical performance, temperature rise, and reliability under load. Customers can trust that even a 15-metre cable performs just as well as a shorter one. This makes Voldt cables ideal for situations where the charging point is further away from the vehicle, without compromising on speed or safety.

No, you should never extend an EV charging cable using a regular extension cord or by adding a cable between the charging station and the vehicle. EV charging cables are engineered to handle high electrical loads safely and must comply with strict international standards such as IEC 62196 and IEC 61851. Using an extension cord not designed for EV charging can lead to overheating, voltage drops, or even serious safety hazards like electrical fires. Therefore, extending an EV charging cable is both technically unsound and not legally allowed in many regions.

If your current EV cable is too short, the safest and most technically appropriate solution is to purchase a longer certified EV charging cable. At Voldt®, for instance, we offer cables in various lengths, ranging from 2 metres up to 40 metres. Our cables are CE and TÜV certified, meaning they meet the highest European safety standards. They are also made in Europe and equipped with extremely weather-resistant connectors suitable for outdoor use throughout all seasons.

It’s also important to note that most mobile EV chargers (like the Voldt® Type 2 to Schuko or Type 2 to CEE models) include features such as temperature sensors, overcurrent protection, and smart communication between the vehicle and the cable. If you add an extension cord, these safety systems may no longer function correctly, which could prevent your vehicle from charging or cause malfunctions. If you need more flexibility, the best approach is to choose a mobile charger with a longer fixed cable length tailored to your needs—without any unsafe extensions in between.

It is technically possible to extend mobile EV charging cables that plug into a standard household socket, but this is strongly discouraged for safety reasons. Extension cables are often not designed to handle the continuous high currents required for EV charging—typically between 10A and 16A. Using an unsuitable extension lead increases the risk of overheating, cable damage, or even fire, especially when charging over several hours. The connectors and wiring of most standard extension cords are simply not built for this kind of prolonged electrical load.

If you do choose to use an extension cable, it’s essential to use a high-quality outdoor-rated extension lead with a minimum conductor thickness of 1.5 mm²—ideally 2.5 mm²—for safe current handling. The extension cable should be properly grounded and have a high IP rating, such as IP44 or higher, to protect against moisture, dust, and other environmental hazards. A rugged, heat-resistant cable housing is also important to reduce the risk of electrical faults or insulation failure.

Still, even with the best extension cord, charging performance and safety can be compromised. That’s why Voldt® recommends selecting a mobile charger with the correct cable length from the outset. Our mobile charging cables are available in lengths up to 20 metres and are specifically engineered to handle EV charging loads safely—without relying on third-party extensions. This ensures maximum safety, full compliance with CE and TÜV certifications, and peace of mind while charging.