V2G project i-rEzEPT impresses with first interim review


The 'i-rEzEPT' project for the integration of electric cars into public and private power grids has delivered convincing interim results.


For a year now, the project's participants have not only been meeting their mobility needs with a Nissan LEAF, but have also been using the electric car as a temporary storage system in their homes as a power grid for self-produced electricity. In a short film, the project partners provide an initial interim review.

As part of the field test, electric car pioneer Nissan has equipped 13 homeowners from all over Germany, who already have a photovoltaic system, with a 100% electric Nissan LEAF and a suitable charging station. The aim is to make the best possible use of the household’s supply of self-generated solar power, relieve the public power grid and at the same time reduce the operating costs of the electric vehicle.

Making use of the Nissan LEAF’s unique bidirectional charging capability, often referred to as vehicle-to-grid technology (V2G for short), participants can use the vehicles to store solar energy generated on the roof of their house in the battery and, if necessary, transfer it to the household or feed it into the public grid.

Nissan launched the "i-rEzEPT" project together with Bosch.IO and the Fraunhofer Institutes IAO and IFAM. The venture is also supported by the Federal Ministry of Transport and Digital Infrastructure as part of the electromobility funding guideline with a total of €2.39 million.

"Electric cars should be charged when electricity from wind or solar energy is available", says Stefan Sonntag, Program Manager E-Mobility at NOW GmbH, a subsidiary of the Federal Ministry of Transport. "i-rEzEPT is testing just that and enables using the energy not only for green driving, but also for powering your own home." 

The interaction between the Nissan LEAF and the domestic power grid is managed by a local energy manager from the project partner Bosch.IO and is based on the Bosch IoT Gateway Software. It ensures, for example, that the range of the vehicle is only slightly affected, as a maximum of 10 to 30 per cent of the battery capacity is used to power the household. If necessary, a full charge of the vehicle can also be prioritised – for example, before starting a longer journey.

The data obtained on electricity usage is evaluated anonymously by the Fraunhofer Institutes IFAM in Bremen and IAO in Stuttgart. In this context, Fraunhofer IAO uses a data platform which was developed specifically for this purpose and determines forecasts for the availability of the vehicles.  “The data is necessary to obtain a scientifically supported statement about the business model of bidirectional charging and to identify potential user groups", says Stefan Lösch from Fraunhofer IFAM.

"Especially due to the fact that more and more people are working from home offers great potential for using renewable energy efficiently and reducing emissions in transport", adds Vincent Ricoux from Nissan Center Europe. "We therefore expect interest in this technology to continue to grow in the future."

The project name "i-rEzEPT" stands for "intelligent regenerative electric vehicles for self-power maximisation and primary control market participation". It aims to further promote the spread and acceptance of electric vehicles and also highlight the role that electric cars can play in stabilising public and private power grids.

Until the realisation of an affordable V2G system for users, the legal basis in particular is still outstanding. In order for the systems to be economically worthwhile for the user, higher subsidies for charging infrastructure and the charging energy management system are also necessary in order to be competitive with stationary battery storage systems.

Nissan LEAF (ZE1) MY20 with 40-kWh battery: combined electricity consumption (kWh/100 km): 17.1; CO2 emissions: combined 0 g/km; efficiency class A+.

Nissan LEAF e+ with 62-kWh battery: combined electricity consumption (kWh/100 km): 18.5; CO2 emissions: combined 0 g/km; efficiency class A+.

The values stated were determined in accordance with the prescribed measurement procedures pursuant to VO(EG) 715/2007 in the currently applicable version 2017/1347 (WLTP).

Zero CO2 emissions in use (when using energy from renewable sources). Wear parts not included. The data does not refer to an individual vehicle and is not part of the offer, but is solely for comparison purposes between the different vehicle types. Further information on the official fuel consumption, official specific CO2 emissions and electricity consumption of new passenger cars can be found in the "Guide to Fuel Consumption, CO2 Emissions and Electricity Consumption of New Passenger Cars", which is available free of charge from Deutsche Automobil Treuhand (DAT). The fuel consumption/electricity consumption and CO2 emissions of an electric vehicle depend on the efficient use of the fuel/energy content of the battery by the electric vehicle and are influenced by driving behavior and other non-technical factors (e.g. ambient conditions).

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