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Technical Information


Technical Information


Technical Information

The intelligent charging system and the design-to-cost approach prevent investment measures in the expansion of the network connection and save costs and time in the construction of the charging infrastructure. The available charging power is distributed to the parked vehicles by the central control unit via dynamic, phase-specific load management.

chargeBIG reacts flexibly to other consumers in the grid and uses the electric vehicles as a controllable load. This enables optimal use of the available power grid.

  • Single-phase charging according to DIN EN 61851-1 “Mode 3” dynamic
    charging power from 2.3 – 7.2kW
  • Individual charging points with 22kW can be integrated (for example for visitor parking)
  • Phase-individual load management with the charging strategy:
    “first come, first serve”
  • Integrated control to avoid unbalanced loads
  • Overvoltage protection and temperature monitoring in the charging cabinet
  • Size-optimized control cabinet in a small installation area
  • Outdoor variant with air conditioning unit for outdoor use
  • Separate bayed cabinet for measuring instruments to comply with
    the calibration regulations
  • Central energy meter for load management,
    grid efficiency and electricity tax accrual

The different variants of the load and energy management of chargeBIG

Static load management

  • Control according to fixed performance targets

Intelligent and dynamic load management


  • Consideration of the available power at the balance point (house or grid connection)
  • Integrated detection and avoidance of unbalanced loads
    Control with the charging strategy: “First come, first serve”.
  • Fast enough charging with single-phase charging power between 2.3 – 7.2kW
  • Integration of unregulated 22kW charging points (max. 2 charging points on 30 single-phase charging points in one charging cabinet)
  • Eco and premium charging (dynamic charging power between 2.3 – 7.2kW or guaranteed 7.2kW charging power)

Grid-optimized load management (under development)

  • Based on market prices or the supply of renewable energies
  • Control and regulation on grid voltage and grid frequency (without remuneration)

Load and energy management

Via controlled load and energy management, the chargeBIG charging infrastructure can be used to limit the max. total load in a building. Costs for excessive peak power can thus be avoided. chargeBIG can co-regulate other loads by prioritizing these loads, such as the kitchen or test bench, and reducing the e-vehicles as a controllable load in the charging current. If the chargeBIG system is not to regulate autonomously, it can be integrated into the building control system and react to load specifications within a second.

Application example of load and charge management with other consumers in the network

Avoidance of unbalanced loads

The phase-individual load management of chargeBIG has integrated an active unbalanced load prevention. Continuous checks are made to ensure that no unbalanced loads of more than 20A occur on the various phases L1, L2 and L3. If unbalanced loads do occur, the system actively counteracts them and regulates the charging current upwards on the less loaded phases. Unbalanced loads of less than 20A are generally permitted according to the Technical Connection Conditions (TAB).

Nominal current

Complete system with 18 charging points: 200A
Complete system with 36 charging points: 400A
Complete system three-phase with N-conductor (connection to NSHV) and single charging points
charging points single-phase with 6-32A dynamic or three-phase with 32A


Voltage 230 / 400V 3NAC
Frequency 50Hz

Charging power

Single-phase 2.3 – 7.2kW dynamically controlled depending on connected load, number of connected vehicles and control parameters

Residual current device and DC fault detection (charging cabinet)

30mA FI type A and 6mA RDC-MD for each charging point

Protection class

IP55 (charging cabinet) and IP54 (plug)


Supply line from the charging cabinet possible from above or below, star-shaped
Wiring of the single-phase or three-phase down conductors to the charging points.

Operating temperature range

Charging point: -25°C to +55°C, charging cabinet: -25°C to +35°C
(in each case without direct sunlight)
Passive cooling system (active cooling at extra charge)

Communication and interfaces

Activation and billing via QR code scan and app
LAN, WLAN (optional), integration in GLT via UPC-UALTE, OICP (eRoaming)

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