ChargeGuru, a company that offers charging solutions, conducted a study on the charging habits of electric car drivers and the evolution of their household energy consumption. 67 households, which have installed a thick headed between January 2020 and August 2021, agreed to share their electricity consumption data.
A very large majority of participants (57) have at home a terminal with a power of 7.4 kW, the good compromise of charging solutions, which allows them to regain approximately 40 km of autonomy per hour. 8 households have a 3.7 kW terminal, a more economical solution when you drive little… or when the electricity consumption of the house is already high.
Because it is of course necessary to watch out for the peak of consumption which the recharging of its electric vehicle can generate, to avoid that all cuts out, because of an overrun of the maximum power subscribed. According to ChargeGuru’s analysis, after installing a charging station, there is a 28% increase in the value of the daily peak consumption, which goes from 2.9 to 3.7 kW.
Customers of an electric car are aware of this. 93% of participants have installed a load control system. Above all, drivers are used to scheduling charging at night, when the rest of the house consumes less. In the survey, about a third of charging sessions took place between 7 p.m. and midnight, and a third between midnight and 6 a.m. In the end, only 3% of households had to increase the power of their meter.
A third of the participants recharge their car every day at home, the rest will do so one to three times a week. With what effect on electricity consumption? According to the study, participants consume an average of 50 kWh to charge their vehicle, which corresponds to approximately 300 km travelled. ChargeGuru notes that with a 3.7 kW charging station, 75% of participants consume less than 40 kWh per week. For a 7.4 kW charging station, 75% of participants consume less than 60 kWh.
As for the total electricity consumption of the house, before and after the installation of the terminal, the study observes an average increase of 21%, from 16 kWh to 19.4 kWh. Logically, the electricity bill of the house increases in a fairly comparable way. With an average consumption of 51 kWh for recharging one’s car, recharging at home costs between 30 and 40 € per month, depending on the rates charged by the electricity supplier.