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Chargemanager

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This tool enables charging of an electric car depending on the availability of surplus energy from the photovoltaic system. Vehicles from the Volkswagen Group that can be connected and controlled by Weconnect and E3/DC home power stations are supported.

The control takes place via the software of the vehicle, independent of the wallbox used.

Depending on the available solar power, the system switches between not charging, charging with reduced or maximum power.

In addition, the house battery can support the charging process. For this purpose, a hysteresis between two SOC values can be set.

The software module requires the tools WeConnect-mqtt and rscp2mqtt.

Prerequisites

If you need to install rscp2mqtt please follow the link.

Please install WeConnect-mqtt as well.

The chargemanager needs the library libmosquitto. For installation please enter:

sudo apt-get install libmosquitto-dev

Cloning the Repository

git clone https://github.com/pvtom/chargemanager.git
cd chargemanager

Compilation

To build the program use

gcc chargemanager.c -o chargemanager -lmosquitto

Usage

Please start the program with

./chargemanager

The available parameters will be displayed.

Start WeConnect-mqtt

./weconnect-mqtt -u "test@test.de" -p "My_weconnect_password" --mqttbroker localhost --prefix weconnect --convert-times Europe/Berlin

Start Chargemanager

./chargemanager --host localhost --vin WVXZZZ12345678900 --no_hysteresis --prefix weconnect

Stop Chargemanager

The user can exit the program by pressing the Ctrl-c key. This also terminates the charging process of the vehicle.

Tested with

  • Volkswagen charger and car (ID serie)
  • E3/DC S10 E 4500 W max battery power
  • Photovoltaic modules with 11 kWp
  • Raspberry Pi 4

Disclaimer

The software is in alpha status. The use is at your own risk. This applies to damages to the hardware (PV system, vehicle), the conditions of Weconnect use and any costs incurred for the purchase of electricity from the public grid and so on. The tool is automatically terminated when the vehicle is disconnected from the wallbox or it is detected that the vehicle is driving.

Known Issues

Sometimes there are difficulties to contact the Weconnect server. Here it may be useful to restart WeConnect-mqtt.