Electric vehicle charging: stations not charging or charging slowly

When several vehicles charge simultaneously, it may seem that some of them are not charging, or are charging slower than usual.

This is expected: the available electrical capacity is limited. The Climkit system distributes power between charging stations to avoid overloading the installation.

This distribution is managed per distribution zone (a group of charging stations sharing the same capacity limit).

How it works

The system recalculates the available charging current at regular intervals based on:

  • the maximum current configured for the distribution zone
  • the readings of the meters associated with the distribution zone
  • the number of active charging sessions
  • the minimum and maximum current allowed for each charging station

If the available current is sufficient for all active charging stations, the system applies the even split. If the current is not sufficient to provide each active station with its minimum charging current, it switches to round robin.

Even split

The even split is the default behavior when the available capacity is sufficient.

In this mode, the system divides the available current equally among all active charging stations in the same distribution zone.

Example:

  • Available current: 30 A
  • Active stations: 2
  • Result: each station receives 15 A

All connected vehicles charge at the same time.

Round robin

Round robin is used when the available current is too low to maintain the charge of all active charging stations at their minimum required current.

In this mode, the system temporarily allows only some of the active stations to charge, while others wait. After 5 minutes, the active stations automatically alternate so that the available current is shared over time.

Example:

  • Available current: 15 A
  • Active stations: 2
  • Minimum current per station: 10 A

Since 15 A is not enough to give each station at least 10 A, the system cannot maintain both charging sessions simultaneously. One station charges while the other waits. The active stations alternate automatically every 5 minutes.

When does the system switch from one mode to another?

  • If each active station can receive at least its minimum current → even split
  • Otherwise → round robin

This decision is automatically recalculated based on changes in site consumption and charging demand.

Important notes

  • Load management is calculated per distribution zone.
  • The actual charging current may still be limited by the charging station or the vehicle.
  • If meter data becomes unavailable or outdated, the system reduces the charging power as a safety measure.

How Did We Do?

Allocation of photovoltaic in the site consumption

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