- Nissan becomes the first automaker to secure G99 AC certification for bidirectional onboard charging technology.
- The Sirius project demonstrated how EVs can function as integrated energy assets for grid balancing.
Nissan announced on May 20 the deployment of its Vehicle-to-Grid technology in the United Kingdom, marking a major development in bidirectional electric vehicle charging systems. The company stated that it became the first automaker to achieve G99 AC architecture certification for a bidirectional onboard charging system. This certification supports the integration of electric vehicles into wider energy infrastructure and enables vehicles to interact more effectively with electricity grids through two-way power flow capabilities.
The newly introduced system uses an AC-based architecture with a bidirectional onboard charger integrated directly into the vehicle. According to Nissan, this design reduces the need for additional charging infrastructure and simplifies installation requirements for users and energy operators. By embedding the bidirectional charging functionality within the vehicle itself, the company aims to make Vehicle-to-Grid deployment more scalable and practical for wider adoption across residential and commercial energy environments.
Comparison of Nissan Energy Transfer Technologies
| Technology | Primary Function | Energy Flow Direction |
|---|---|---|
| V2L | Supplies power to external devices | Vehicle to load |
| V2H | Powers residential homes | Vehicle to home |
| V2G | Supports electricity grid balancing | Vehicle to grid |
Nissan also outlined the distinctions between V2L, V2H, and V2G technologies. While Vehicle-to-Load and Vehicle-to-Home systems primarily deliver energy to appliances or residential properties, Vehicle-to-Grid technology enables electric vehicles to contribute directly to broader power grid balancing operations. This capability allows EV batteries to store energy during low-demand periods and return electricity to the grid when demand increases, helping utilities improve energy stability and optimize renewable energy usage.
The company further highlighted the Sirius project, which was developed together with Wallbox in Spain. The initiative involved 23 Nissan Leaf vehicles and demonstrated the practical implementation of electric vehicles as integrated energy assets. Through the project, Nissan evaluated how connected EV fleets can interact with grid infrastructure while supporting energy distribution and storage functions. The results reinforced the role of bidirectional charging technologies in future smart energy ecosystems.
Frequently Asked Questions
What is Nissan’s Vehicle-to-Grid technology?
Nissan’s Vehicle-to-Grid technology enables electric vehicles to send electricity back to the power grid using a bidirectional charging system. The technology allows EVs to function as mobile energy storage units that can support electricity demand balancing during peak consumption periods. Nissan’s latest AC-based architecture integrates the bidirectional charger directly into the vehicle, reducing infrastructure complexity and simplifying installation. The system also helps improve renewable energy integration and demonstrates how EVs can contribute to future smart grid and energy management systems.
What was the purpose of the Sirius project?
The Sirius project was developed by Nissan and Wallbox to evaluate the real-world application of Vehicle-to-Grid technology using Nissan Leaf electric vehicles. The project involved 23 vehicles operating as connected energy assets capable of interacting with power infrastructure. Its main objective was to demonstrate how EVs can store and return electricity to support grid balancing and energy optimization. The initiative also provided insights into integrating bidirectional charging systems into broader smart energy ecosystems for residential and commercial applications.
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