Peak Shaving is a Power Management setting that helps lowering the peak usage of your building.

It's basically the same as Load Balancing, where the maximum current of a group is respected. But with Peak Shaving, you basically lower the maximum current of that group.

In some countries like Belgium, there's a tax for your peak usage, so this may come in handy.

As Power Management settings are group based, so you find them in the location settings, not in the charger settings.

So the goal is to prevent your building from using too much power at once. We need to know 3 things:

To know the second item, there must be a meter installed at the main fuse of your building. This way, we can constantly monitor your power consumption and adjust the charging speed accordingly.

When you use more power in your building, we charge slower. If more power becomes available, we can charge faster.

Let's take the scenario from our Load Balancing article.

So the scenario looks like this:

If we start charging without peak shaving, we will just stay below the 25A maximum of your building's main fuse. In fact, we are just doing Dynamic Load Balancing. This is how that looks:

But let's say you only want to consume a maximum peak of 18A. This maximum is the Peak Limit (yellow):
​

You can see the charger will always try to keep your building below the yellow line. Because the minimum charging speed of your car is 6A, this sometimes means we have to stop charging entirely.

But at 8:30, you are still consuming 20A, so past the limit of 18A. We cannot prevent this, as the charger has already stopped charging. This may happen when all other devices in your building combined are simply using 20A. The charger cannot affect this. In this case, you may want to look at a home battery system or V2G solution.