a drop in energy via household sockets?

In its latest study, the ADAC reveals that wall sockets lead to high losses on vehicles when recharging.

In its latest study, the ADAC, a German association specializing in the automobile, shows that electric vehicles lose a significant amount of energy when recharging. An interesting findingwhile these losses sometimes cost the driver dearly, without the latter realizing it.

Electric charging, domestic outlets pointed out

To carry out this study, the ADAC tested charging on four different models. The association compared charging on a domestic socket (alternating current) and on a Wallbox-type wall socket. The models chosen are the following: Renault Zoé, Fiat 500e, Volkswagen ID.3 and Tesla Model 3. The results are as follows.



Wall box


Reduced wall box


Renault Zoe

2.3kW / 24.2%

11kW / 9,7%

no measurement

VW ID. 3

2.3kW / 13.6%

11kW / 9,0%

5.5kW / 9.2%

Tesla Model 3

2.3kW / 15.2%

11kW / 7,7%

3,5kW / 11,4%

Fiat 500e

2.3kW / 12.7%

11kW / 6,3%

3.6kW / 13.9%

Source : ADAC

According to the data recovered by the ADAC, we note that the losses are sometimes significant. Thus, on a classic household socket, the losses observed during recharging on a Renault Zoé are 24%. We note that the losses are also significant on the Wallboxes, with sometimes almost 10% loss of energy during recharging. Losses that have a cost, since this could cost up to €120 per year on the example of the Renault Zoé.

How can these losses be explained?

If household sockets lose so much energy when recharging, it is due to the nature of the current. Indeed, the batteries of electric vehicles cannot only store direct current. However, the home network only provides alternating current. The on-board charger must therefore itself convert the alternating current into direct current, which explains the considerable losses.

The study also indicates that other losses occur within the vehicle’s electrical system. Not least because of the different control units, active during recharging. These consume a lot of energy.

Finally, the ADAC specifies that a charging cable that is too long, or aging or faulty equipment can lead to additional energy losses.

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How to avoid these losses?

To avoid these losses, the ADAC recommends “to always charge on the wall box with maximum charging capacity”. Thus, the battery should always be full as quickly as possible, because the higher the power, the shorter the charging process.

The ADAC also issues three measures that manufacturers must put in place to limit these losses:

  • Manufacturers should make the load losses that occur transparent so that electric car users can act accordingly.

  • The efficiency of on-board chargers needs to be improved. AC charging mirrors the majority of charging processes, so there is great potential for energy saving.

  • The onboard 12 volt system should be turned off to an absolute minimum during a charging session.

Source : ADAC

Source: AutoplusAutoplus by www.autoplus.fr.

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