Power recording for the integration of e-charging stations

The raise in electromobility leads to an increasing need for charging stations outside of the private sector. There is an increasing desire to install charging stations in multi-storey car parks and office car parks. The question often arises whether the existing electrical connection has sufficient power reserves or whether there is a risk of current overload.

Power measurements on charging stations

Bild von (Joenomias) Menno de Jong auf https://pixabay.com

To make this clear let’s take an example project in which we have performed a power measurement.

Figure 1 shows the electricity consumption of a typical office building (approx. 200 employees) with the usual consumers, operating conditions and canteen operation. The red border line at 200 A corresponds to the protection of the house connection.

Leistungsmessung mit PQ Box von Eberle

Figure 1: Time course of electricity consumption

The clearly recognizable midday peak already leads to the full load on the main fuse. However, it becomes clear that most of the time there is still free capacity in which electric cars can be charged without any problems.

Table 1 gives an overview of typical charging stations and their power consumption.

In our example, a parallel operation of 5 type 2 charging stations with 11 kW charging power would be possible most of the time.

Type Loading power Nominal current
Type 2 11 kW / 22 kW / 43 kW 16 A / 32 A / 63 A
CCS 50 kW 72 A
CHAdeMO 22 kW / 50 kW 32 A / 72 A
Supercharger 135 kW 200 A

Table 1: Overview of typical charging stations

Modern charging systems mostly offer the option of active load management in order to be able to optimally use the free capacities of the house connection.


We analyze and you operate!

It is obvious that a power measurement must be carried out as a basis for planning charging stations.

PQ ENGINEERING has high-quality mobile network analyzers and specially trained staff who can carry out measurements with suitable protective equipment without the need to shut-down the energy supply.

Based on our extensive graphic and written evaluations, installer companies can work out an energy management concept for your system.

In addition, when evaluating your measurement, we assess the local power quality and draw your attention to possible sources of interference in your network.

Leistungsmessung für Integration von E-Ladesäulen