overview

Below are some configuration examples. Click on the links below to go directly to your example:

In the examples below, a cFos Power Brain Wallbox with included cFos Charging Manager is used as the central control unit. Alternatively, you can also use a Raspberry Pi. The cFos Charging Manager (already integrated in the cFos Power Brain Wallbox) can control wallboxes and meters via LAN/WLAN (Modbus TCP/IP) and wired (twisted) two-wire connection (Modbus RTU). In addition, a Modbus proxy is supported, with which you can combine both. For more information on the connection options, see: Connection options.

In the cFos Power Brain Wallbox, the "internal" wallbox and the internal S0 meters 1 and 2 are always set up as devices and are displayed as tiles. These cannot be deleted; they can only be deactivated if necessary. Wallbox and S0 meter 1 are activated, S0 meter 2 is deactivated. So that you can see the tile of S0 counter 2 and configure it, you must activate the "Show all" checkbox under "Start" under "Devices". The IP address, port and Modbus ID are permanently set for all of these internal devices. So you don't need to configure anything here. The cFos Charging Manager is activated by default, ie the mode is "Load sharing". The cFos Power Brain Wallbox works with all functions in the standard setting. If you want to operate a cFos Power Brain Wallbox as a slave, you must set the mode to "monitor". Otherwise you do not need to configure anything in the slave wallbox as long as you use standard values 4701, 4702 and 4703 for the TCP port for the wallbox and S0 meters 1 and 2, as well as the Modbus ID 1, 2 and 3.

1 wallbox, 1 solar meter, solar excess

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As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The role of the S0 meter is "generation" because it measures the performance of the solar system.
The wallbox has, for example, 15 kW house connection power plus solar power available. The charge rule ensures that the charge is only charged from a minimum current of 6.5 A. Surplus loading.

1 wallbox, 1 e-car consumption meter, Sunspec solar system, solar excess

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As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The S0 meter 1 of the cFos Power Brain 11kW wallbox and is wired in such a way that only the current drawn by the wallbox is measured. The role of the S0 meter is "E-car consumption"
The wallbox has, for example, 15 kW house connection power plus solar power available. The charge rule ensures that the charge is only charged from a minimum current of 6.5 A. Surplus loading.
The address of the SunSpec solar inverter can be found in your router settings. 192.168.2.155:4702 was entered here as an example.

1 wallbox, 1 electric car consumption meter

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As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The S0 meter 1 of the cFos Power Brain 11kW wallbox and is wired in such a way that only the current drawn by the wallbox is measured. The role of the S0 meter is "E-car consumption".
The "house connection" has 15 kW. This power is statically available (as there is no house connection meter). You should set the phases of the S0 meter as the car actually uses them, i.e. usually L1 or L1 + L2 + L3.

1 wallbox, 1 house consumption meter

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As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The S0 meter 1 of the cFos Power Brain 11kW wallbox and is wired in such a way that only the electricity that the house draws (without the wallbox) is measured. The role of the S0 meter is "consumption".
The house connection has 15 kW. The output of the S0 meter is deducted from this output. The rest is available for charging the e-car. If brief peak loads occur in the house, the charging power is reduced. In order not to overbook the 15 kW, a reserve of 2 kW was set up.

2 wall boxes, 1 home consumption meter

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Setup master slave operation
Both wallboxes share the house connection power of 15kW minus 500 W control reserve. The S0 meter has the role of "consumption", ie it measures what the house currently needs (without wall boxes). The charging power minus house consumption is distributed across both wallboxes. With 15kW and 500 W reserve, 14.5kW are available for charging. For example, if the house still needs 3kW and both charge at the same time, each wallbox receives 5.75kW charging power.
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

For other devices: instructions for some wallboxes, meters and inverters
1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
2nd slave
The 2nd wallbox (slave) is connected to the WLAN (house network). It is operated as a Modbus (TCP/IP) slave. Hence the address e.g. 192.168.2.150:4701 and slave ID 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents a one-sided phase load when both cars are charging on L1. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). If both cars only charge single-phase, both can get full power on their phase.
S0 counter:
The S0 counter is connected to the S0-1 input of the master and therefore has standard values as described above. It could also hang in slave S0-1 and would then have the address 192.168.2.150:4702, slave ID 2, for example.

2 wall boxes, 1 home consumption meter, 1 inverter

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Setup master slave operation
Both wallboxes share the house connection power of 15kW minus 500 W control reserve. The S0 meter has the role of "consumption", ie it measures what the house currently needs (without wall boxes). The available charging power is the house connection power of 15 kW minus 500 W control reserve minus house consumption, measured with the S0 meter, plus solar power, as measured by the SMA inverter. So if the house needs 2.5 kW and the solar system generates 4 kW, the wallboxes together have 15 - 0.5 - 2.5 + 4 = 16 kW. These are split in half if both load at the same time.
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

For other devices: instructions for some wallboxes, meters and inverters
1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
2nd slave
The 2nd wallbox (slave) is connected to the WLAN (house network). It is operated as a Modbus (TCP/IP) slave. Hence the address e.g. 192.168.2.150:4701 and slave ID 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents a one-sided phase load when both cars are charging on L1. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). If both cars only charge single-phase, both can get full power on their phase.
Counter:
The first S0 counter is connected to the S0-1 input of the master and therefore has standard values as described above. It could also hang in slave S0-1 and would then have the address 192.168.2.222:502, slave ID 3, for example.
The second "counter" is therefore an SMA inverter that is connected to the WLAN (house network). He has the role of "generation".

2 wall boxes, 1 meter for house consumption, 1 meter for unknown solar systems

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Setup master slave operation
Both wallboxes share the house connection power of 15 kW minus 500 W control reserve. The current house consumption is deducted from this output and the current solar output is added. So if the house needs 2.5 kW and the solar system generates 4 kW, the wallboxes together have 15 - 0.5 - 2.5 + 4 = 16 kW available. These are split in half if both load at the same time.
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

For other devices: instructions for some wallboxes, meters and inverters
1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
2nd slave
The 2nd wallbox (slave) is connected to the WLAN (house network). It is operated as a Modbus (TCP/IP) slave. Hence the address e.g. 192.168.2.150:4701 and slave ID 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents a one-sided phase load when both cars are charging on L1. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). If both cars only charge single-phase, both can get full power on their phase.
Counter:
The first S0 counter is connected to the S0-1 input of the master and therefore has standard values as described above. It counts home consumption and therefore has the role of "consumption".
The second counter could be a Modbus counter, e.g. ABB B23, Eastron or Orno and is connected to a Modbus 2-wire connection on the Modbus terminal of the cFos Power Brain (master) and the COM parameters in the counter are 9600 baud, 8 data bits, none Parity and 1 stop bit set. Its slave ID is 1. Its role is "generation" because it measures the performance of the solar system.

2 wall boxes, static house connection

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Setup master slave operation
Both wallboxes share the statically allocated 15 kW. This means that if only one is charging, it will receive 11 kW. If both are charged at the same time, both receive 7.5 kW each (minus 500 W set control reserve).
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
2nd slave
The 2nd wallbox (slave) is connected to the WLAN (house network). It is operated as a Modbus slave. The IP address in the WLAN is specified here as the address for this wallbox (e.g. 192.168.2.150). The port for the wallbox is 4701, slave ID 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents one-sided phase loading when both cars are charging in one or two phases. If both cars only charge single-phase, both can get full power on their phase. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). The charging power is divided among the charging cars. If no meters are connected, the cFos Charging Manager assumes that the car is always using the power it is offered. Without a counter, you can set which phases are used by the car.

2 wall boxes, static house connection, 2 meters attached to the wall boxes

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Setup master slave operation
Both wallboxes share the statically allocated 15 kW. This means that if only one is charging, it will receive 11 kW. If both are charged at the same time, both receive 7.5 kW each (minus 500 W set control reserve). With the attached meters, the Charging Manager can assign more than 7.5kW to a wallbox if the other wallbox currently needs less.
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

For other devices: instructions for some wallboxes, meters and inverters
1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The first S0 meter is attached here. For the charging manager, it looks like the meter is installed. A tile for the counter in the overview window disappears.
2nd slave
The 2nd wallbox (slave) is connected to the WLAN (house network). It is operated as a Modbus slave. The IP address in the WLAN is specified here as the address for the wallboxes (e.g. 192.168.2.150). The port for the wallbox is 4701, slave ID 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents one-sided phase loading when both cars are charging in one or two phases. If both cars only charge single-phase, both can get full power on their phase. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). The charging power is divided among the charging cars. If no meters are connected, the cFos Charging Manager assumes that the car is always using the power it is offered.
The second S0 meter is attached here. For the Charging Manager it looks like the meter is installed. A tile for the counter in the overview window disappears.
Counter:
The first S0 counter is connected to the S0-1 input of the master and therefore has standard values as described above. It counts the consumption of Wallbox 1 or Master Wallbox.
The second S0 meter is connected to the S0-1 input of the slave and therefore has the address 192.168.2.150:4702, slave ID 2. Its role is "Consumption Auto" because it measures the consumption of the slave wallbox.
The second S0 meter could also be attached to the internal wallbox of the slave. Then it would look to the cFos Charging Manager as if the slave wallbox had a built-in meter and therefore no meter would need to be configured for this wallbox in the cFos Charging Manager of the master.

2 wallboxes, static house connection, 2 meters attached to the wallboxes, second Modbus RTU wallbox

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View from the Master Wallbox:

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View from the slave wallbox:

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Setup master slave operation
Both wallboxes share the statically allocated 15 kW. This means that if only one is charging, it will receive 11 kW. If both are charged at the same time, both receive 7.5 kW each (minus 500 W set control reserve). With the attached meters, the Charging Manager can assign more than 7.5kW to a wallbox if the other wallbox currently needs less.
The correct Modbus ports and slave IDs must be set:

  • Default for the wallbox: Port 4701, slave ID 1
  • Default for S0 counter 1: Port 4702, slave ID 2
  • Default for S0 meter 2: Port 4703, slave ID 3

For other devices: instructions for some wallboxes, meters and inverters
1st master
As described above, the internal wallbox and S0 meter 1 are already set up and activated in the master wallbox (cFos Power Brain).
The first S0 meter is attached here. For the Charging Manager it looks like the meter is installed. A tile for the counter in the overview window disappears.
2nd slave
The 2nd wallbox (slave) is connected to the Modbus RTU with a twisted two-wire connection to the master wallbox. It is operated as a Modbus slave. As an example, the COM port parameters were entered as the address: COM1,9600,8, n, 1 and ID is 1.
The slave is connected with a phase rotation of 120 degrees, ie the electrician has rotated the phases in relation to the master (L1 -> L2, L2 -> L3, L3 -> L1). This prevents one-sided phase loading when both cars are charging in one or two phases. If both cars only charge single-phase, both can get full power on their phase. The cFos Charging Manager can monitor this, provided it can measure individual phases (not measured here, but a phase rotation of 120 degrees has already been entered for demo purposes). The charging power is divided among the charging cars. If no meters are connected, the cFos Charging Manager assumes that the car is always using the power it is offered.
The same COM parameters must be entered in the slave.
Counter:
The first S0 counter is connected to the S0-1 input of the master and therefore has standard values as described above. It counts the consumption of Wallbox 1 or Master Wallbox.
The second S0 meter is attached to the S0-1 input of the slave and is attached to the slave and its role is set to "Consumption E-Auto" in the slave. For the charging manager, the slave wallbox looks like one with a built-in meter. There is no need to set up a meter for this wallbox in the cFos Charging Manager of the master.