Load management wallbox for multiple users

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The Heidelberg Wallbox Energy Control 

The demand for electric vehicles will continue to grow enormously in the future, and it will be impossible to avoid having to provide a wallbox for several users. Various aspects need to be taken into account here. These include, for example, access control to prevent strangers from gaining access to the wallbox - identification via RFID card is popular and at this point we would like to refer you to our Amperfied Wallbox connect.home reference. But the topic of load management will also become increasingly important if several users are provided with different charging points.

Why? Most buildings are not prepared for high charging capacities with their existing electrical infrastructure. Without suitable load management, this can quickly lead to overloads in the power grid as well as rising load peaks and electricity prices. The Heidelberg Wallbox Energy Control provides a remedy here and distributesthe electricity optimally and precisely to up to 16 vehicles. It is therefore particularly suitable, for example, for company fleets, hotels, the catering trade, or retailers who need an efficient charging infrastructure for several parking spaces.

The advantages of your wallbox with load management system

Local load management for up to 16 wallboxes
Suitable for apartment buildings as well as company and hotel parking lots
Connection to Home Energy Management (HEMS)
Your electrician can install the wallbox without any problems
Without follow-up costs, since maintenance-free
Environmentally friendly and efficient use of electricity

Technical Highlights of the Heidelberg Wallbox Energy Control

  • Enables local load management from two networked wallboxes.
  • A maximum of 16 wallboxes can be networked without any problems.
  • Features Modbus RTU for external load management control (e.g. via a HEMS).
  • Convinces with a high-quality, robust stainless steel front.
  • The rated current is adjustable from 6 to 16 amps.
  • The connection is made to 230 volts (single-phase) or 400 volts (three-phase).
  • With integrated residual current detection: DC 6 mA according to IEC62955.
  • Optional access control via switching element, e.g. RFID, key switch, etc.
  • Connection charging cable: Type 2.

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Wallbox with load management:

That's what it means.

How the wallbox with integrated load management works

In principle, the power resources at a charging station are limited. At peak times - for example, when several hotel guests, restaurant visitors, employees or customers want to charge their electric and hybrid vehicles - this could theoretically become a problem and not all vehicles could be charged directly. This would cause frustration and discontent, which one would naturally like to avoid.

The solution: a load management system in the wallbox. It distributes the available charging energy to all vehicles to be charged. An example: In a parking lot with 10 charging stations and 5 charging vehicles, another vehicle is added. Without load management, newly added vehicle owners might have to wait until other vehicles release the charging energy to be able to charge themselves - the maximum possible charging energy would ultimately be occupied.

With load management, on the other hand, the wallbox is simply connected to the vehicle and the energy supply of the other wallboxes is distributed to the new vehicle. As soon as an e-car is fully charged, it is supplied with sufficient charging energy in standby mode - to continue operating the auxiliary heating or air conditioning system, for example.

These load management options are possible with Heidelberg Wallbox Energy Control

With Heidelberg Wallbox Energy Control , static and dynamic load management - the latter, however, only in combination with the Heidelberg Combox Lite) - possible.

  • Static load management: Here, a defined maximum charging power is distributed among the charging points.
  • Dynamic load management: Depending on the power consumption in the building, the power available for the charging stations can be flexibly adjusted up to the level of the grid connection power and distributed to electric and hybrid vehicles as needed. For this control, the Heidelberg Combox Lite is connected to the back end via OCPP 1.6. The information on the maximum charging current is passed on to Combox Lite via the LAN interface and distributed to the wallboxes that are currently charging a vehicle.
  • Our blogger Christian describes more information about the respective advantages and areas of application. here.

Load management

Example: 5 wallboxes

Example 22 kW for 5 wallboxes - load management when charging ends

The wallbox for efficient and sustainable charging

Connect the wallbox to your PV system

Do you have a photovoltaic system and a home energy management system, a so-called HEMS? The Heidelberg Wallbox Energy Control can be easily connected to this system via Modbus RTU. In this way, you can use your own surplus electricity from the PV system to charge your electric or hybrid vehicle. At the same time, the system only feeds as much solar power into the wallbox as is currently available. In this way, you protect the climate and your wallet twice over.

The wallbox for multiple users in the apartment building

With its integrated load management system, the wallbox is ideal for the multi-family house, as it enables simultaneous and on-demand charging of up to 16 electric or hybrid vehicles. But on the subject of charging infrastructure in apartment buildings, the question often arises as to the rights and obligations of tenants and landlords with regard to the installation of charging solutions. Generally speaking, in a multi-family house, the path to one's own wallbox is not quite as uncomplicated as in a single-family house. But the legislator has done a lot to ensure that the path to a charging option in a multi-party building is nevertheless as simple as possible. In the AMPERFIED blog, our expert Christian has taken a closer look at this topic.

Charging technology made in Germany

For more than 170 years, the HEIDELBERG brand has stood for quality and sustainability in the global printing industry. But we are also convincing in electromobility with innovative, customer-oriented solutions. We have now given this commitment, which has been in place since 2014, a name: AMPERFIED. The wholly owned subsidiary, founded in April 2022, stands for smart charging technology made in Germany and aims to be a trustworthy and reliable partner on the road to the future of electromobility.



RegulationsEN61851-1; EN61439-7
Charging poweradjustable up to 11 kW
Rated voltage230 V - 400 V
Rated currentup to 16 A (adjustable from 6 A to 16 A in 2 A steps)
Nominal frequency50 Hz
Charging mode1-, 2- or 3-phase
Net shapesTT/TN
Connection technologySpring clamp technology (2.5 mm² to 6 mm²)
Cable feed/cable entrySurface or flush mount - 9 to 17 mm
Connection cross section1 mm² to 10 mm² - Solid conductor (rigid)
1 mm² to 10 mm² - Flexible conductor (flexible)
1 mm² to 6 mm² - Flexible conductor with ferrule (flexible)
The respective national regulations for installation must be observed.
Charging port/couplingType 2
Length charging cable (m)5 m / 7.5 m
Status informationFront lighting
Data interfaceRS485/ModBus RTU
External enable/disable of the wallboxExternal RFID module, key switch, ripple control signal grid-serving charging
(maximum charging current/reduced charging 8A) or via Modbus RTU.
Protection classIP54 (splash-proof)
Residual current detectionDC 6 mA according to IEC62955
Protection against mechanical shockIK08
Operating temperature range (°C)-25°C to +40°C
Temperature behaviorWithin the operating temperature range, the charging current is permanently provided
. If the temperature is exceeded, the charging process is interrupted. After
a cooling phase, the charging process is restarted automatically.
Storage temperature range (°C)-25 °C to +80 °C
Permissible relative humidity (%)5 % to 95
Altitude (m)Max. 3000 meters above sea level
Protection classI
Overvoltage categoryIII
Dimensions (W × H × D) (mm)386 mm × 295 mm × 112 mm
Weightapprox. 8 kg

Wallbox with an individual look?

You can also customize the front screens of our wallboxes. Whether for the Heidelberg Wallbox Home Eco or the Heidelberg Wallbox Energy Control, you decide on the look. Sounds cool?


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