Project no. 213
Visualizing Environmental Impact of Electric Vehicles
DTU Electrical Engineering, Technical University of Denmark
A new technology called V2G charging allows you not only to charge your electric vehicle,
but also to discharge it. In other words, the technology makes it possible to let an electric
vehicle deliver electric power back into your household power plug, and thereby back into
the power system. Why would you ever charge your electric vehicle, just to discharge it
through the power system? Simply because charging and discharging many electric vehicles
at the right moments can help stabilize the power system, which allows more renewable
power sources to be implemented. The goal of this project is to create a device, that
visualises when an electric vehicle is charging and discharging through the power system. In
addition, the environmental impact of the power used for charging is visualised
simultaneously. All to help the user of the electric vehicle to understand the environmental
impact of the charging, and the fact that charging and discharging an electric vehicle can
help to reduce CO2 emissions.
The device for visualization is designed to be mounted directly of the charging cable used to
charge an electric vehicle. Figure 1 illustrates a sketch of the device, which consists of two
cases, each equipped with a display, and this project delivers a prototype of this device. The
cases are mounted to the charging cable using standard cable ties. The small squares
arranged in a butterfly shape in Figure 1 are all LED units that altogether make up a display,
capable of visualizing whether the electric vehicle is charging or discharging. The
environmental impact is indicated by the color shown on the display, and the actual impact is
calculated based on data gathered wirelessly from the website www.electricitymap.org.
Figure 1: A sketch illustrating the design of the device for visualization.