The maximum number of concurrent charging sessions supported by a single OCPP 1.6J Charge Point is determined by the implementation and hardware capabilities, but typically ranges from 1 to 4 sessions simultaneously. This limit is not strictly defined by the OCPP 1.6J standard itself, but rather by the charge point manufacturer’s design and the underlying communication infrastructure.
How Concurrent Sessions Work in Practice
In real-world deployments, a charge point may support multiple sessions if it has the necessary hardware and software capabilities. For example, a high-end charge point might allow two or more vehicles to connect and start charging at the same time, provided the power supply and communication channels can handle the load. The exact number depends on the charge point’s internal architecture and the number of physical connectors it supports.
Each session operates independently, with its own communication channel to the Central System. This means that even if multiple vehicles are charging, each session maintains its own status updates, transaction data, and control signals. The system must manage these sessions efficiently to avoid conflicts or communication bottlenecks.
What This Means for Charge Point Operators
For operators managing charge points, understanding concurrent session limits is essential for optimizing deployment and avoiding performance issues. If a charge point is expected to handle more sessions than it supports, it may lead to dropped connections or delayed responses. Operators should verify the specifications of their charge points to ensure they meet the demands of their charging network.
When planning a fleet or commercial installation, operators must consider how many vehicles might attempt to charge simultaneously. A charge point that supports only one concurrent session may become a bottleneck in high-traffic areas, while one that supports four could better accommodate peak usage times.
Related Reading
For more on related topics, see: Effortless EV Charger Testing: Tecell’s Free OCPP 1.6 Compatibility Suite – Tecell.
Further reading: EV Charging Software Features | Tecell CMS (UnityCharge) – OCPP, Billing, Mobile
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