How does controlling a charging plaza work?

At the back end of our charging plaza management, you can clearly see how we can now control sessions. In this blog post we explain the technology we've recently been working on.

How does controlling a charging plaza work?

At Stekker we have worked hard over the past year on Stekker Charging Plaza Management – that’s our software solution for companies that struggle with the consequences of the full power grid and still want the charging stations on their charging plaza to predictably continue charging cars. Quite a challenge in times of grid congestion, but one we were happy to take on. And we’d like to share how we can now control charging sessions within all kinds of constraints.

In this blog post we give a glimpse into our kitchen, where you can see how we can control individual charging stations to get the entire charging plaza under control. Users and administrators can specify their own preferences here. The screenshots on this page come from an admin page of our own, where we can monitor the sessions. We will show more of the front end of the software soon – here mainly a visualization of the control of the charging sessions.

Control charging sessions within a limit

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In this graph you can see all charging sessions of a day at a charging plaza called ‚Head Office‘. You can see how two early birds plug in at 7 o’clock and that the charging plaza then fills up considerably between 8 and 9 o’clock in the morning.
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These are the limits of the location: The green line indicates the total limit of the building location. The red line indicates the limit of the charging plaza specifically. The orange line meanwhile indicates how high the total consumption is of the location.

It may seem on the image above as if the total consumption (the orange line) exceeds the maximum limit of the location (the green line). That’s just a shortcoming of this specific visualization at the moment, which uses data that looks back and therefore contains some ‚rounding errors‘. From customer data we can see that the total consumption never goes over the limit. We mainly want to explain the principle of our new technology in this post.

Individually ’squeeze‘ sessions

Our charging plaza management can scale back some charging sessions during the time that little electricity is available. This can differ per vehicle, depending on preferences set by the user or the administrator.

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In this image an individual session is isolated and therefore clearly visible. This charging station starts charging at 11kW around 8:30 but is soon ’squeezed‘ by the algorithm. This creates space for charging sessions that have been given a higher priority.

It could well be that this charging station, for example, is set as a ‚guest charging station‘, where visitors can charge – but it goes a bit slower when necessary, so that essential business processes and services such as free charging for guests don’t get in each other’s way.

From 13:30 we see that this session again gets the space to charge at regular speed. Apparently there is then again enough room to also charge vehicles at a low priority at 11kW.

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And yet this charging session during the same hours may continue charging at 11kW. It could be, for example, that this vehicle is charged using a charging card that always indicates that charging should be done with priority.

Only around 11:00 we see that this vehicle also has to adapt to the congestion on the local charging plaza. But from lunch there is again enough space to resume charging at regular speed.

Available limits

Stekker is ready with Charging Plaza Management to control large numbers of vehicles within different types of limits and constraints. We show that in these two images.

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Stekker is compatible with a sensor in the meter cupboard of a location, so that our software is always aware of the maximum of a location, and can switch charging up and down in no time per charging station, vehicle or charging card.
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Administrators of the charging plaza can also raise the limit of a site themselves. Account can also be taken of an existing PV installation, dynamic limits or additional requirements of, for example, a capacity-limiting contract.

This was just a preview of what we are currently working on at Stekker. Interested or have questions about our charging plaza management and curious what it can mean for your location? Contact [email protected] for more information.