Go safe!

Buy our complete package with dynamic house load management so that you can be sure that your house connection will never be overloaded by charging.

Currently due to a delivery bottleneck for only € 795 if you can wait about 2 months.

Charging start per:

  • LAN
  • Start-stop knopf
  • taktilem display
  • Bluetooth
  • RFID
  • WIFI
  • Automatically if the time is programmed

In your fuse box:

Smart Meter  with RS485 Modbus, eWall charges up to 11Kw and automatically reduces when the base load including charging current exceeds the house connection value (e.g. instantaneous water heater, oven, heat pump, etc.) capacity is released

In your fuse box:

Circuit breaker

Residual current protection

Combination 20A

Space saving = 4P

Technische Daten

Instead of an external box, you can also buy our eWall module for installation in your fuse box.

Abacus eWall , the wallbox system that automatically and dynamically adapts its charging current to your current house electricity load (house DLM included, not just local DLM).

Our complete set offer: Special price due to delivery bottlenecks, only 795 € net for a short time, KFW-subsidized:

Abacus  eWall  charger with 4m charging cable and type 2 charging plug, type B circuit breaker 6ma DC, OCPP communication protocol 1.6, WIFI for communication via the Internet (e.g. for maximum charging current and charging times), mode 3 according to DIN EN IEC 61851-1 (VDE 0122-1 ), 11KW, 3-phase electricity.

Energy meter (wattmeter), three-phase, 3x100A, 3x230V, with RS485 Modbus RTU interface for DLM (dynamic load management)

We recommend laying a moisture-proof cable NYM-J 5×2.5mm2 up to a length of 25m, otherwise 4mm2 (you can get this in every hardware store); the data cable (e.g. can be ordered to the exact meter from  Conrad ) can run parallel to the power cable.

The electrician will connect the cables to your house fuse box by clicking the wattmeter and a 20A circuit breaker-FI combination into the Din rails. This is usually done quickly. Then the eWall is started and the initialization sequence is checked. Wallboxes may be subsidized by the state, your electricity provider or other institutions.

Which house connection do you have? Take a
look at the main fuses, it says :
69kW = 3x 100A; 43kW = 3x 63A; 34kW = 3x 50A; 22kW = 3x 32A

Whether this performance is sufficient always depends on what is being used at the same time – also in the future!


Safety is only ever provided by load control, taking into account the dynamic base load (oven, toaster, hair dryer, vacuum cleaner, microwave, hotplate, heat pump, electric heater, electric boiler, etc.). If you have been able to cope with the connected load up to now and charge at night, you shouldn’t usually have to upgrade thanks to the DLM.

Our intelligent solution is funded by the KFW as described below. Before ordering, you must of course be sure that you have the necessary power connection.

eWall installation site: Ideally close to the car and electrical connection, protected against rain and direct sunlight (otherwise the internal temperature in the box will rise unnecessarily).

KfW funding (as long as active)

For example, private connections to wallboxes are funded, which cost at least € 900 including the fees for installing and connecting the charging station (charging point). For example, for 12 charging points you will receive 12×900 = 10800 € with the KFW subsidy.

The prerequisite for funding is that you only use electricity from renewable energies for your charging station.

What you have to do:

  1. Apply for a grant, save the email of the KFW application confirmation.
  2. Order the Abacus eWall system and transfer the amount to our bank account, lay cables and install fuse (s) with an energy meter, test the system.
  3. Apply for a subsidy payment of € 900 per charging point by uploading our confirmation invoice and the electrician’s installation invoice to the KFW server.

The interaction of the Abacus  eWall  with the wattmeter enables cybernetic energy control of your maximum total current, as our energy meter, built into your fuse box, communicates with the Abacus eWall via RS485 data line and dynamically adapts the charge load (reduced or up to a maximum of 11KW, the more charge load allows KFW is not for this funding, and from 12KW you need the consent of the electricity supplier, with 11KW the Abacus eWall  only needs to be  registered with the provider, but he is not allowed to oppose, and with our DLM he should be reassured immediately).

Explanation of the picture: Example: House connection maximum 22KW (32A / phase), you charge your car with 11KW (16A / phase) and switch on the oven (3KW), the hotplates (5KW), the washing machine (2KW) and other consumers (5KW) . Since you are already drawing 15KW, the eWall now regulates down from 11KW to 22KW-15KW = 7KW until enough capacity is available again for more charging power.

After entering your maximum current, the Abacus  eWall regulates  the charging current automatically so that the charging process never overloads your house connection.

How is your power consumption changing and why is dynamic load balancing so important?

Default output situation:

  • Electric car, 12000km mileage
  • 50KWh battery; Charging between 20-80% = 30KWh / charge
  • 30cents / KWh energy costs
  • 20KWh / 100km BEV consumption
  • 4-person household 3500KWh / year

This results in:

100km = 20KWh; 12000km = 2400KWh; This means that around 2400KWh more are consumed annually than in the household (now 5900KWh).

Additional costs per year: 2400KWh x 30cents / KWh = 720 €.

How often do you have to charge? 2400KWh / 30KWh / charge = 80 charges annually or every 4-5 days.

How long does a charge last? 30kWh / 11KW charging capacity / hour = approx. 3 hours.

However, the wave of electric cars has an impact on network operators, because only a good 20% of the energy is consumed by electricity, but the mineral oils currently make up  much more:

At the same time, petroleum products are still used almost exclusively for propulsion in traffic:

Source: Federal Environment Agency

Switching to electric drives will therefore increase electricity consumption.

Will we soon have enough electricity? The good news: For a year now, we have been producing more electricity from renewable energies than from fossil and nuclear materials. The bad news: The other half should be replaced as soon as possible, plus the electric cars. Another problem, however, is the situation at the road transformer and the house connection, i.e. at the transition from medium to low voltage and in the house fuse box. The capacities will not be sufficient in many places, which is why intelligent charging will soon become unavoidable.

What is the difference between static, local and dynamic loading?

  • With static, the box is entered as to how much current it is allowed to pass through. For example, if the house has a 22kW connection and 15kW are drawn from time to time in the house, the box should never draw more than 7kW. If there were additional capacities in the house (e.g. at night), the box would still only charge slowly with a maximum of 7kW. A completely useless system for a network.
  • With local “dynamic” loading, the box is given the maximum amount of current it can pass through to its slaves. For example, if the house has a 34kW connection and 22 kW of it are drawn from the water heater from time to time, the master box should never pass more than 12kW through. With a minimum current of 6A according to the IEC 61581-1 standard, almost three BEVs can be charged per three-phase phase 6A x 3 x 230V = 4.14kW per car, which can be enough for a small network. If there were additional capacities in the house (e.g. at night), the box would NOT use them. Usually an unusable system for a network in an underground car park.
  • With global dynamic house charging, the charging system is given the maximum amount of electricity available to the house / building. The charging system would use the entire maximum household connection current for charging if no other consumer was active in the house. If a water heater were to start up briefly, the charging system would reduce the current drawn for as long as necessary in order to increase it to the maximum value again after the capacity has been released. For example, if the house has a 34kW connection, it doesn’t matter how much the house consumes, the charging system would always provide the difference between the house connection value and house consumption for charging. This means that up to eight cars can be charged at the same time with the same connection value as in the example of local dynamic charging (34kW).

Both DC Fast Charging and Mode3 AC 22kW – and mostly 11kW – ​​are impossible if many cars (BEV = battery-powered electric vehicles) are to be charged at the same time.

Fast charging has to be carried out on the autobahn, the battery will suffer here, according to the ADAC, but it just has to be charged quickly. During the work phase, but especially at home, 8-16 hours are available for charging. Charging slowly, carefully, because time usually allows it, and not overloading the house connection value, is often the most sensible or usually the only way if several BEVs are to be charged.

Each parking space should have a charging port, so that annoying reparking after the charging process is no longer necessary. What is important here is the intelligence of the system, which ends the charging process and immediately distributes the released charging capacity across the entire network.

In particular, it must be ensured that the house electricity capacity is used in an optimized manner. The Abacus  eWall  DLM system is precisely specialized so that a large number of cars can be optimally charged over a period of time specified individually by the user as well as by the distribution network operator in relation to the house connection options mostly without the electrical connection of the house or house having to be enlarged, because here there would be considerable costs.

Private households use the power distribution networks very differently:

Now it quickly becomes clear why load balancing, i.e. house dynamic load distribution (DLM), is necessary: ​​If households switch to electromobility, the network distributors may have to enlarge the lines if the considerable charging load is generated at an inopportune time.

But bottlenecks can also arise within a household’s power distribution system: The load exceeds the house connection value, the fuses are blown out to protect the cables from overheating and possible cable fires.

To prevent this from happening, the load must always remain below the maximum permissible house connection value.

The car battery should be charged between 22-7h as shown in the picture above. The electricity supplier is also happy to support this attitude self-interested by providing the

If so, then often offers electricity at a lower tariff, at least that’s what politicians want.

Studies assume over € 20 billion for infrastructure expansion, if charging is carried out as it suits you. However, if the EVs are charged intelligently, these expenses can be saved. For this reason alone, the promotion of intelligent wallboxes also makes political sense!

Another question is, of course, how many kW of charging power must be made available for charging. Our simulator for 60 EV shows you that you can get by with around 1kW per EV. According to these calculations, a 3x 100A line (69kW) can charge well over 50 EV.

Abacus  eWall s charging time as well as the maximum house load is entered by you via the app or via the tactile display, so you can always use other large consumers, the Abacus  eWall  would reduce their electricity accordingly.

We are convinced that our Abacus  eWall  , including the included RS485 energy meter, offers the optimal solution to keep the house load within the permitted range (also important from an insurance perspective!). Of  course, the Abacus  eWall only regulates its own electricity consumption, not that of other consumers.