Bidirectional wallbox

Bidirectionality is a term that is currently frequently encountered in the field of electromobility. Bidirectional charging covers the areas of Vehicle to Grid (V2G), Vehicle to Home (V2H), and Vehicle to Load (V2L). Each of these use cases requires different framework conditions. The ghostONE platform is already technically prepared for some of these use cases.

Vehicle to Grid

Vehicle to Grid seems to be the most relevant use case in the current debate on the energy transition, because the large battery capacity of e-vehicles is expected to have a supporting effect for the energy grid as a very quickly controllable power storage (the e-car). However, there is still a lack of suitable cars for this purpose – individual car manufacturers are currently in the process of developing vehicles with a power supply function. The technical standard for this is called ISO 15118-20 and is already in preparation as a software update for the ghostONE platform. Of course, the framework conditions for the other side – the grid – must also be defined. A prerequisite for this is already being developed within the framework of §14a EnWG. There, it is defined how a communication channel can be established via the smart meter gateway. Only through this infrastructure will a controllable, grid-serving feature become possible: bidirectional charging to support the grid.

Vehicle to Home

Vehicle to Home is also relevant for the ghostONE platform. We classify it into two use cases here:

Use case 1: Self-consumption optimisation and dynamic electricity tariffs.

We have been able to charge the e-vehicle cheaply with electricity – either with a dynamic electricity tariff or through our own PV system – and now want to use the cheap electricity for our house at a later time. This would already be technically possible today with the ghostONE platform, but there are still no legal regulations to prevent abuse. Abuse could occur, for example, if an e-vehicle was charged free of charge (tax-free) at the company and was then profitably fed back into the grid via the private home or otherwise not used as traction current. 

Use case 2: Emergency power supply

We have a power failure and want to “emergency supply” the house with the battery of the vehicle. Here, a mains disconnection device is needed at the house connection to prevent the emergency power supply from feeding the external power grid backwards while perhaps repair work is being carried out on the power lines. The necessary technical adaptations in the wallbox that enable a so-called “black start capability” will be implemented in a future generation of the ghostONE platform.

The ghostONE platform is already technically prepared for some of these use cases.

Vehicle to Load

Vehicle to Load is not relevant for the ghostONE platform, but it is a real enrichment for every camper and festival-goer. Here, the car has a special adapter and this makes it possible to operate the camping cooker or the music system with the car’s electric storage. Don’t worry – you’ll still be able to drive home – for the car, this is a minimal amount of energy.


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