r-tec WCU-22 Wallbox

Overview

WCU-22 Wallbox is the fixed main product of the r-tec EV charging portfolio. With 22 kW maximum charging power from a 3-phase 400 VAC mains input, it powers electric vehicles — fully charging a typical EV battery in 3-4 hours (Tesla, BMW i, VW ID. and other 3-phase charging-supported models). With its fixed wall-mounted structure, it provides long-life infrastructure in commercial car park, office garage, estate entrance area and premium car park projects.

Why 22 kW?

22 kW is the top capacity of the AC charging segment. Comparison with the other powers offered in the sector:

Power	Use	Full charge time (60 kWh battery)
3.7 kW (single-phase 16 A)	Home / basic use	16 hours
7.4 kW (single-phase 32 A)	Premium home / small workplace	8 hours
11 kW (3-phase 16 A)	Office / medium-level estate	5.5 hours
22 kW (3-phase 32 A)	Commercial + premium car park	3 hours

22 kW offers the most suitable capacity for the average parking time (3-4 hours) at shopping centre and plaza car parks. If faster charging (DC) is required, the infrastructure investment goes up 5-10 times; slower (11 kW) falls short of the shopping centre visit duration.

Target projects

• Car park chains — Shopping centre, plaza, hospital, university, airport.
• Office garages — Service offered by building management to employees + visitors.
• Residential estates — Apartment common area or villa garage.
• Hotel + restaurant car parks — Guest service + within the Green Key certification scope.
• Factory service garage — Company vehicle fleet (usually 8+ wallboxes).

Multi-wallbox installation — load management

When more than one WCU-22 is installed at a single point, mains load balancing is critical. Example: 5 wallboxes × 22 kW = 110 kW potential momentary load — most existing facility transformers cannot handle this.

Load management module (optional):

• Static load management — Total facility capacity is fixed limit (e.g. 50 kW); wallboxes share this capacity. 1 vehicle charging → 22 kW; 5 vehicles → 10 kW each.
• Dynamic load management — The facility’s actual instantaneous load is measured (production, air conditioning, lighting); EV charging operates from the remaining capacity. Optimal so that the transformer is neither fully loaded nor idle.

Standards and compliance

• IEC 62196-2 — Type 2 connector standard.
• IEC 61851-1 — Mode 3 AC charging communication protocol.
• EN 60364-7-722 — EV charging electrical installation.
• EN 61851-22 — Above-ground Mode 3 AC charging device safety.
• EMC: EN 61000-6-3 / 6-2 — Industrial + residential EMC.

Field discipline

Before installation, absolutely:

• Electrical project — Transformer capacity, distribution panel capacity, cable cross-section (min 5 × 6 mm² Cu).
• Earthing ring — Local earthing resistance < 4 Ω.
• RCCB selection — The device has no built-in residual current protection; a minimum 30 mA Type-A RCCB must be fitted in the panel (manufacturer requirement). It can be upgraded to Type B on installations that need DC fault detection.
• Fuse — 32 A C-type breaker (separate for each wallbox).
• EPDK licence — Licence must be obtained for commercial charging point operation (operator side).
• Location — Cable length max 5 m is recommended to the location where the vehicle parks; if longer cable is run, there is a socket wear risk.

Model notes

Installation height and cable entry direction should be selected according to the IP54 class; too high installation (above 1.5 m) is contrary to user accessibility standards, too low (below 0.5 m) is difficult use for women/small users. Typically 1.1 – 1.3 m height from the ground.