Separate billing at private EV charging points through an advanced smart meter infrastructure: from technical realisation to practical use cases

The spread of e-mobility can be accelerated if private charging infrastructure could be put to wider and more flexible use. Technical and tax restrictions currently prevent the simple and seamless charging of different users or different cars at private charging points in Germany. In this paper, we present a new technical solution for the separate metering and billing of EV-charging at private charging points. Our solution is based on an advanced smart meter infrastructure and event-driven tariffs. At the beginning of each charging process, the charging infrastructure triggers a tariff event to allocate the electricity consumption to the specific tariff register of each user or EV. The accumulated energy quantities of each user are then transmitted to the electricity supplier using standard and secure BSI-processes. The paper describes the technical framework, including the enhanced smart meter infrastructure, and the required processes and signalling between the stakeholders and technical components. Results of various tests using a prototype of an enhanced SMGW of EMH metering conducted in our E-Mobility Laboratory are also shown.