Home Energy Management System

Drive on electricity – Intelligent charging

The new home energy management system (HEMS) from Hager is installed in the technical centre of the home by an electrician and connected via routers with the various devices. The home is thereby fully networked and the devices can communicate with each other. This communication calls for the use of the EEBUS standard. Specifically, EEBUS stands for a common and manufacturer-independent language for energy management. Irrespective of the device brand, it can communicate with the others in the home.

Three components – easily installed

Available in Germany, the flow System XEM600 consists of three components. The central energy management controller (6 TE), a power supply (4 TE) and an energy meter (4 TE). All modular devices are mounted on the DIN rail in the technical centre, wired via quickconnect and connected with each other via a Modbus. Before you install flow and the charging station, however, you should carry out a home check. To do this, determine the current condition of the electrical installation and the maximum available charging performance.

XEM461 energy management controller

The heart of flow: It establishes the connection to the charging station, the energy meter and the Internet and ensures continuous data communication between all components.
Transfer protocol: EEBus (supported by the German automotive industry, VDA)
ISO 15118 communication standard
Modbus interface
LAN port 1 and 2: For local and global configuration

Power supply 24 V DC, TGA200

This provides the required voltage for the energy management controller.
Operating voltage: 230 V AC
Frequency: 50/60 Hz
Output current: Max. 1 A

ECR380D energy meter

The three-phase Modbus meter measures the energy after the meter connection. With an additional energy meter, the photovoltaic current can be measured if required.
Number of poles: 3
Type of measurement device: Electronic
Direct measurement: 80 A
Modbus interface: Connection to the XEM461 energy management controller via Modbus line HTG465H


Blackout protection

During initial installation, flow is configured to the maximum connected load in the home. The electric vehicle is therefore always charged using the maximum available power – while taking into consideration the other electrical consumers that are currently active in the home. This minimises the charging times without overloading the house connection.


Cost-optimised charging

For the charging plan, the vehicle takes into consideration the current and future energy costs that are transferred by flow. I.e. it charges when electricity is at its cheapest. The prerequisite for this is flexible electricity tariffs from the energy provider, e.g. day/night or weekday/weekend tariffs. By using self-generated photovoltaic electricity, charging becomes even cheaper: Based on the weather forecast, flow predicts the expected quantity of PV electricity and charges the electric vehicle with a maximum of solar energy.


Solar energy usage

With this function, the vehicle's charging performance is automatically adapted to the currently available photovoltaic electricity supply from the private PV system. In sunshine, the charging performance increases, and on cloudy days it falls. Users can therefore increase their private consumption of their solar system and save money with every kilometre they drive.

Everything at a glance – everything within reach

The web interface of flow provides information about all electricity flows and consumption within the home. The display is divided into three sections: MyHome shows the current energy status of the home and the charging cycles of up to three different electric vehicles. Forecast predicts the expected solar values and PV electricity purchases. Performance informs the user about the performance and advantages of flow. In addition, conclusive energy reports can be compiled for any desired period of time.

Know what's what – know what's working

The user receives additional information in the Forecast and Performance sections.

Energy management for the intelligent home

Through the use of photovoltaic systems or cogeneration plants, the home of the future is increasingly becoming less of a pure consumer and more of an active "producer" of electricity. In other words, it is developing into an all-in-one electricity generation and consumption system. All energy and data highways come together in the technical centre. Thanks to intelligent energy management, the meter cabinet is to a certain extent becoming the "brain of the house" and a trendsetter for the energy revolution on a smaller scale.

Full energy control

An energy meter and visualisation from flow give the user an overview of all electricity consumption and purchases in the home at all times.

Solar energy

Photovoltaic electricity from your own rooftop can be used to charge an electric vehicle and supply household consumption as well as – for payment – be fed into the regional electricity grid.

Wind energy

The stronger the wind blows, the cheaper wind energy becomes. Significant surplus capacity even results in negative electricity prices, i.e. the purchaser gets money back.

Conventional energy

Gas and coal-fired power plants today cover the main burden of energy supply. In the wake of the German federal government's Energiekonzept 2050 energy plan, the proportion of renewable energy sources for gross final consumption of energy will be set at 60% in future, while for electricity generation, this will even be extended to 80%.

Batteries as energy accumulators

In the future, it will also be possible to integrate energy storage into flow.

On the road with Audi AG

Charging a car can push the supply to its output limits. To guard against this and allow charging with maximum output, we are developping together with Audi AG a concept for charging the Audi e-tron: flow – the intelligent Home Energy Management System. We are delighted to have a strong partner by our side for this joint project with Audi.

The new home energy management system from Hager is installed in the technical centre and connected with the Audi connect charging system via an internet router. With the Audi connect charging system, the charging performance doubles to 22 kW (compared to a conventional 400-volt three-phase socket with up to 11 kW) and the charging time is halved to four and a half hours*. Using flow, up to three different electric vehicles can be charged at the same time. The communication between the components takes place via the new EEBus standard, which is being used increasingly in the automotive industry as a manufacturer-independent energy protocol.

*Estimated average charging time for electric vehicles with a battery capacity of approx. 100 kWh (as at September 2018)


Flow Home energy management system
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