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cFos Charging Agent

The cFos Charging Agent is aimed at operators of parking lots that are to be equipped with wallboxes for charging electric cars. The goal is to provide the individual electric cars with as much charging power as possible, taking into account the available total power - without having to increase the existing house connection capacity

Previous solutions are expensive and usually limited to a specific supplier of wallboxes

The cFos Charging Agent allows you to set up your charging infrastructure according to your needs. For this purpose, cFos Charging Agent supports a number of wallboxes from different manufacturers. We are constantly working on expanding the list of supported wallboxes

To plan your charging infrastructure, first select the desired wallboxes. For large systems, the individual wallboxes should be as inexpensive as possible so that the total costs remain manageable. For this reason, the cFos Charging Agent also supports low-cost models and will then make any missing wallbox functionality available in other ways

Supported wallboxes

(*) We tested the cFos Charging Agent for compatibility during the OCPP July 2020 Plugfest. If you want to make sure that your OCPP device works with the cFos Charging Agent, please contact us for a free remote test

The choice of wallbox determines the networking. Mixed and retrofitted wallboxes from other manufacturers are also possible. So you are not dependent on a wallbox manufacturer!

With OCPP and Keba, networking typically consists of Ethernet cabling. go-e and SMARTFOX use WLAN. EVracing (Stark-in-Strom) and SmartEVSE require 2-wire Modbus RTU cabling. The cFos Charging Agent can communicate simultaneously with Ethernet, WLAN and via Modbus RTU

Billing and Authentication

OCPP wallboxes, as well as Keba, go-e and SMARTFOX have built-in electricity meters that the cFos Charging Agent can read and make the kilowatt hours used available for billing. Wallboxes with controllers from EVracing and SmartEVSE require a separate meter. In this case, the ABB B23 112-100 pro wallbox, which is wired via Modbus RTU, is a good choice. We recommend to install a separate Modbus for networking the intermediate meters

OCPP wallboxes typically have an RFID reader for authentication. Also the go-e Home+ Mobile, SMARTFOX Car Charger and most models of the keba c- and x-series have their own RFID reader. In this case you will teach these wallboxes new RFID cards. Then these wallboxes check the RFID card and activate the charging process automatically. The cFos Charging Agent remains informed about the charging process and can regulate the charging power

For wallboxes without their own RFID reader, release can be done via a Web interface of the cFos Charging Agent by entering a PIN. You can also connect an RFID reader to the cFos Charging Agent or network it with one or more RFID readers. The cFos Charging Agent then takes over authorization and release of the wallboxes. Mixed operation of wallboxes with and without RFID readers is also possible

Control of charging power

The cFos Charging Agent tries to distribute the maximum connected load installed in the building as well as possible to the electric cars to be charged
The cFos Charging Agent calculates the available charging power from one second to the next as follows:

To record consumption (and generation), Modbus-capable intermediate meters must be installed:
Either you install an intermediate meter for each consumer and generator or you install a central meter at the house connection. In both cases, the cFos Charging Agent reads the meters via Modbus (we recommend the ABB B23 112-100 with direct measurement for powers up to 40kW and the ABB B24 112-100 with transformer measurement with corresponding transformer coils for higher powers. Both can be read out well via Modbus RTU

Many intermediate meters output so-called S0 pulses (e.g. 1000 pulses per kWh). The cFos Charging Agent can also evaluate these pulses per counter using a USB FTDI adapter

By recording consumption and generation, the cFos Charging Agent always knows how much charging power to distribute to the wallboxes in use. You can assign different priorities to the individual wallboxes. The available charging power is first distributed to the wallboxes of higher priority and the remaining power is then distributed to the wallboxes of lower priority. This way you can, for example, quickly recharge emergency vehicles while long parked users are "refuelled" during the day

The prioritization scheme also supports the temporary deactivation of wallboxes if the minimum charging power is not reached. In addition, the phase symmetry is monitored to prevent individual phases from being loaded beyond the level prescribed by the VDE during single-phase charging

Charging rules

Several charging rules can be configured per user and per wallbox, which determine the charging performance according to certain criteria. This allows you to configure e.g. certain times when the charging power is limited

Furthermore, the charging power can be changed depending on a switching input, for example, if the energy supplier signals certain tariffs by doing so. Another possibility is to control the charging power depending on the available generation capacity of a solar system

Material list

  • Wall boxes and cabling
  • 1 Raspberry PI 3 or 4 plus power supply unit or Windows PC
  • One USB <-> RS485 adapter (FTDI, virtual COM port) per Modbus RTU
  • Intermediate counter
  • Additional FTDI adapters for S0 counters
  • additional RFID readers for cFos Charging Agent (may require additional Raspberry PI)

Prerequisite is that the cFos Charging Agent is connected to the Internet and can be reached from "outside".

OCPP wallboxes typically have an RFID reader for authentication. Also the go-e Home+ Mobile, SMARTFOX Car Charger and most models of the keba c- and x-series have their own RFID reader. In this case you will teach these wallboxes new RFID cards. Then these wallboxes check the RFID card and activate the charging process automatically. The cFos Charging Agent remains informed about the charging process and can regulate the charging power

cFos Charging Agent prices

  • Non-commercial license for up to 2 EVSEs (for private use only): 29,- EURO
  • Commercial license per EVSE / charging plug: 79,- EURO + VAT

scenarios

1Single family house with solar system

1-2 wallboxes, Charging Agent, intermedita meter for home consumption measurement, S0 meter for wallbox consumption measurement

1 wallbox with 22kW and instantaneous water heater would overbook the existing house connection capacity. Thanks to charge management, the charging power for the car is shut down when someone takes a shower or cooks. With 2 wallboxes the charging power would be distributed to both cars. Solar power is used to charge the cars during the day

2Garage 50 parking spaces

with go-e boxes and central ABB B24 (Modbus to Raspberry PI) in an apartment building

In several places in the garage there are RFID readers that communicate with the cFos Charging Agent

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系統需求

  • 具有永久Internet連接的Windows 10或Raspberry Pi 3或4

Manufacturer's declaration

Download manufacturer's declaration as PDF

cFos Charging AgentcFos Charging Agent產品概述。