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Technical Information


Technical Information


Technical Information

Due to the intelligent charging system and design-to-cost approach, there is no need to invest in the expansion of the grid connection, resulting in substantial cost and time savings during the installation of the charging infrastructure. The central control unit distributes the available charging capacity to the parked vehicles using dynamic and phase-individual load management.

chargeBIG responds flexibly to other consumers in the network and uses the electric vehicles as a controllable load. This ensures optimal utilization of the available power supply.

  • Single-phase charging in accordance with DIN EN 61851-1 „Mode 3“
    Dynamic charging power from 2.3 – 7.2kW

  • Individual charging points with 22kW possible (e.g. for visitor parking spot)

  • Dynamic and phase-individual load management with charging strategy: „first come, first serve“

  • Integrated control to avoid unbalanced load

  • Overvoltage protection and temperature monitoring in the charging cabinet

  • Size-optimized control cabinet on a small installation area

  • Cabinet version with air conditioning unit for outdoor use

  • Separate modular cabinet for measuring instruments to comply with calibration regulations

  • Central energy measuring device for load management and taxation purposes

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 load

  • Control with the charging strategy: „first come, first serve“

  • Charging fast enough with single-phase charging power between 2.3 – 7.2kW

  • Integration of uncontrolled 22kW charging points (max. two charging points together with 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 energy

  • Control and regulation on supply voltage and grid frequency (without compensation)

Load and energy management

The chargeBIG charging infrastructure can be used to control the load and energy management in a building while avoiding to exceed the maximum load limit. Thus costs for peak power can be reduced. chargeBIG can also regulate other loads by prioritizing these loads such as the kitchen or the test bench and reducing the electric vehicles as a controllable load in the charging power. If the chargeBIG system should not regulate autonomously, it can be integrated into the building management system and react to load specifications within one second.

Application of load management including other loads

Reduction of unbalanced loads

The phase individual load management of chargeBIG has an integrated active unbalanced load avoidance. It is continuously checked that no unbalanced loads of more than 20A occur on the different phases L1, L2 and L3. In order to compensate unbalanced loads the charging power on these phases are increased accordingly. Generally, in Germany unbalanced loads of less than 20A are allowed according to the “Technische Anschlussbedingungen” (TAB).

Rated current

Complete system with 18 charging points: 200A
Complete system with 36 charging points: 400A
Complete system three-phase N-conductor
(connection to low voltage main distribution)
Charging points single-phase with 6 to 32A dynamic or three-phase with 32A


Voltage 230 / 400V 3NAC
Frequency 50 Hz

Charging power

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

Fault current protection and DC current fault detection (charging cabinet)

30 mA RCD type A and 6 mA RDC-MD for every charging point

Protection class

IP55 (charging cabinet) and IP54 (plug)


Charging cabinet: wiring from above or below via modular cabinet

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 for extra charge)

Communication and Interfaces

Activation and billing via QR code scan and app (conform to the callibration law), LAN, WLAN (optional), integration into the building management system via OPC-UA, LTE, OICP (eRoaming)

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