Installing a wallbox: registration, § 14a EnWG and what to check beforehand

Anyone who drives an electric car wants to charge it conveniently at home or at work. A household socket is only a stopgap for this: it is not designed for a continuous load lasting several hours and charges slowly. A wallbox charges much faster and – when correctly installed – is safe. To avoid surprises, a few points should be clarified before you buy.

11 kW or 22 kW: which power rating makes sense?

Most private wallboxes charge at 11 kW (three-phase, 16 A). That is enough to fully charge a typical electric car overnight. Wallboxes with 22 kW charge faster – but only if the vehicle can actually take this power. Many models charge at a maximum of 11 kW on AC. In addition, 22 kW requires approval from the grid operator (Netzbetreiber).

Registration with the grid operator

Under the Low Voltage Connection Ordinance (Niederspannungsanschlussverordnung, NAV), the following applies:

Registration is usually handled by the electrical contractor (Elektrofachbetrieb) carrying out the work. The responsible operator is the local distribution system operator (Verteilnetzbetreiber) – in Cologne, for example, Rheinische NETZGesellschaft.

§ 14a EnWG: the wallbox as a controllable consumer device

Since 1 January 2024, newly connected wallboxes with more than 4.2 kW have been classed as controllable consumer devices (steuerbare Verbrauchseinrichtungen) under § 14a of the German Energy Industry Act (Energiewirtschaftsgesetz, EnWG). This means:

• If the grid is at risk of overload, the grid operator may temporarily reduce the power – to no less than 4.2 kW. Charging therefore always remains possible.
• In return, the grid operator may not refuse the connection on the grounds of insufficient grid capacity.
• You pay reduced grid fees (Netzentgelte): either as a flat-rate reduction (Module 1) or as a percentage reduction of the energy rate (Arbeitspreis) with a separate metering point (Module 2). Since April 2025, Module 1 can additionally be combined with time-variable grid fees (Module 3).

Control requires suitable equipment in the meter cabinet (Zählerschrank) – usually a control box (Steuerbox) in combination with a smart metering system (intelligentes Messsystem). Whether your meter cabinet has space for this should be checked in advance.

Technical requirements for the installation

A wallbox needs its own circuit with a suitable cable cross-section and its own overcurrent protection. The following are also important:

• Residual current protection: a Type A residual current device (RCD, FI-Schutzschalter) in combination with DC residual current detection (6 mA) – often already integrated into the wallbox – or a Type B RCD.
• Cable route and cross-section: matched to the power and cable length so that nothing heats up excessively and the voltage drop remains low.
• Surge protection: protects the sensitive charging electronics and is often required for new installations anyway.
• Load management: with several charging points or limited service connection capacity, it distributes the available power intelligently.

The installation is carried out in accordance with DIN VDE 0100-722. On completion, the installation is measured and the results are documented in the test report (Prüfprotokoll).

Wallboxes in apartment buildings and owners' associations

Tenants and apartment owners have a legal right to be permitted to install a charging facility (§ 554 BGB and § 20 Abs. 2 WEG). As a rule, the costs are borne by whoever wants the wallbox. In residential complexes with several interested parties, an overall concept with load management is worthwhile: it allows many charging points to be operated without overloading the service connection (Hausanschluss).

Funding

Funding programmes for wallboxes change frequently. You should check before ordering whether grants are currently available from the federal government, the state of North Rhine-Westphalia (NRW), your municipality or your energy supplier – many programmes require the application to be submitted before the purchase.

How we work with you

1. On-site check: service connection, meter cabinet, cable route and mounting location.
2. Quotation: transparent and including all protective devices.
3. Registration: with the grid operator, including approval for more than 11 kW.
4. Installation and testing: professional installation, measurement and test report.
5. Briefing: you learn how to operate the wallbox and load management.

Find out more about our services in E-mobility & solar. For commercial properties and residential complexes, it is also worth taking a look at the charging point obligations under the GEIG.