Smart Charging & Profiles

Easee OCPP supports the smart charging feature profile within OCPP 1.6J but not in its entirety. Please see below for further information about this.

For a more conceptual understanding of smart charging please read the API section API Smart Charging.

Supported parts of OCPP Smart Charging

Easee supports the following parts of OCPP smart charging:

  • ChargePointMaxProfile
  • TxDefaultProfile

Non-supported parts of OCPP Smart Charging

Easee does not support the following part of OCPP smart charging:

  • TxProfile

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Unsupported Messages

If you send an unsupported message in OCPP we will reject it and it will not be passed down to the charger.

With additional parameters for specific cases listed below:

  • connectorId
    • cannot be > 2
  • chargingProfileKind
    • relative not supported
  • chargingProfilePurpose
    • TxProfile not supported
  • chargingProfilePeriod
    • Up to 16 periods supported

The sequence diagram below is for illustrative purposes only:

437437

A sequence diagram illustrating a few specific cases that are supported in Easee OCPP smart charging.

Set Charging Profile

The schedule/period is stored on the charger and will survive reboots (non-volatile memory storage). This allows it to function offline (without internet). As a consequence of storing on the charger, there is a maximum amount of storage writes possible in the lifetime of the charger and too frequent writes to this memory will cause wear in charger hardware.

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Lifetime write and erases: 100,000 cycles
Daily recommended maximum writes: 25 schedules

Exceeding the recommended figure will quickly approach the lifetime limits. This will void your warranty on the charger.

DynamicCircuitCurrent / DynamicChargerCurrent

These configuration keys are supported by Easee chargers to enable controlling systems to provide input for real time load balancing in addition to the local load balancing already provided by the charger through the circuit master/secondary structure.

DynamicCircuitCurrent

DynamicCircuitCurrent is a CSV string that allows OCPP central systems to set the maximum current for all phases on the charge point set as master for a circuit. A string formatted as “p1,p2,p3” is sent through OCPP where pN is the maximum current to be allocated on that circuit. This allows central systems to provide additional load balancing on a site with minimal network traffic quick response times (in most cases less than 10 seconds).

If a central system wants to limit the current delivered on the circuit where EC000123 is set as master, it would set DynamicCircuitCurrent to “16,16,16”. This would let EC000123 handle the load balancing on the circuit as normal, but limit the current it delivers to 16A on all 3 phases. To disable this limitation the central system would set this key to “32,32,32”.

DynamicChargerCurrent

DynamicChargerCurrent is a simple int set on each device to limit the maximum current delivered by that device. When set the charger cannot deliver more than the set current to the EV.

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There are multiple ways an Easee Charger can be configured to limit current. A circuit can be downrated by the electrician, the charger knows the circuit fuse settings, charging plans and so on. The charger will look at all the possible limitations and take the lowest number and consider that as its limit.

If multiple mechanisms are in use at the same time, operators need to take care when setting the limits. The lowest limit will always apply!

LockConnectorPhaseMode

Used to lock charger to certain phase modes for charging. Useful in scenarios where cars do not accept power from certain power grids, or when the car does not support 3-phase charging.

Configuration key is a string specifying the following behaviour:

  • Lock1Phase - Lock charging to single phave
  • Auto - Charger automatically determines 1 or 3 phase mode
  • Lock3Phase - Lock charging to 3-phase