V1G, or dynamic charge management, is the optimisation performed by Dreev. The purpose of this acronym is to emphasise the specific nature of this type of control compared with other recharging methods, which may be complementary.

What is V1G?

The V1G allows one-way control (‘1’ direction) of the vehicle’s charge (‘V’) according to needs, the local grid and national and European electricity markets (‘G’ for Grid). The core of Dreev’s added value lies in its ability to control charging as a function of different price, grid or CO2 signals. This is optimisation under constraint, with mobility needs remaining the priority at all times.
There are a number of different control methods:

Programmed charging: This is a static optimisation of charging. The vehicle is charged at a fixed time, for example at the start of off-peak hours. This is the simplest control mode.

Power control under constraints: This involves limiting the charging power so as not to exceed the power available on site. This is a relatively common service that Dreev can also provide.

Recharging priority management: This method of control makes it possible to define priorities for recharging electric vehicles according to predetermined criteria, such as the battery’s state of charge, imminent travel requirements and planned departure times. Dreev is already implementing this service for bus fleets.

Dynamic charging: Charging adapts in real time according to demand and the availability of electricity. The Dreev platform is capable of forecasting the most optimal charging curve based on changes in electricity prices. This is one of Dreev’s special features. This is what we call V1G and can include the other methods mentioned above.

Example of spot prices on the French market

V1G – optimising charging in real time with Dreev

Dreev’s main added value lies in its ability to optimise the charging of electric vehicles in real time, in line with changes in electricity prices.

This intelligent management does not require any changes to your electricity contract, just the agreement of your supplier. The Dreev platform schedules charging mainly at times when electricity prices are lowest. The gains are made thanks to the price difference between peak and off-peak hours.

Operational mobility needs remain the priority at all times. If there is a conflict between optimising recharging and charging requirements, the latter are always given priority. At any time, it is possible to ‘force’ recharging and deactivate control.

Dreev optimises charging in real time according to electricity markets. This optimisation is both predictive, by anticipating needs, and reactive, by adapting to new data transmitted in real time.

We go even further by optimising charging according to RTE’s EcoWatt electricity weather forecast. Charging is shifted to give priority to times when the energy mix contains the least carbon. Electricity is generally cheaper when low-carbon sources, particularly renewable sources, are producing at full capacity.

Controlling charging also enables vehicles to provide services to the electricity grid. Under certain conditions, it will be possible to participate in frequency regulation services via primary, secondary and tertiary reserves.

In short, Dreev’s V1G is a tool for optimising recharging that is transparent to users, and helps to reduce CO2 emissions.