This article explains what load management is and how to choose between Dynamic Load Management (DLM) and Static Load Management (SLM) for your EVCI installation.
What is load management?
Load management controls the charging power of EV charging stations (EVCS) at a site. It distributes available power across all connected EVCS while keeping total consumption within configured grid import limits.
Load management is the foundation for all other eMobility features in the gridX Energy Management System (EMS). All other features — such as peak shaving and clustering — build on top of it.
Two variants are available:
Dynamic Load Management (DLM) — uses a real-time grid meter at the Grid Connection Point (GCP) to react to both controllable and uncontrollable loads. If the meter fails, the EMS estimates uncontrollable load using a configurable fallback value to ensure all limits continue to be respected.
Static Load Management (SLM) — uses a fixed power limit without a grid meter, based on aggregated EVCS power measurements
How do I choose between DLM and SLM?
Choose based on whether a grid meter is installed at the GCP.
Use DLM when:
A grid meter is installed at the GCP
The site has significant uncontrollable load (building consumption, HVAC, etc.)
Precise fuse protection is required
The site requires advanced features such as DSO signaling or battery optimization
Use SLM when:
No grid meter is available
Uncontrollable load is minimal or predictable
The configuration of a grid meter takes precedence over the product configuration in the XENON Dashboard. If SLM is configured but a grid meter is present, the system may behave as a DLM system. Always verify that the product setting matches the actual hardware setup.
What are the hardware requirements for load management?
EVCS with controllable charging power and power or current measurements
EVCS measurements available at least every 5 seconds
gridBox with internet connection (minimum 10 Mbit/s)
What are the general EV charging technical requirements?
All load management variants depend on the following EV charging behavior:
Minimum charging power
Most EVs require a minimum of 6 A per phase to charge
Some EVs require 8 A or 10 A per phase
Phase detection
The EMS has no phase information before the EV plugs in
At plug-in, a brief full-power charge runs to detect the number of phases the EV supports
Zero-power lock
Zero-power locks are only configured for some EVCS models
When the EMS reduces an EV to zero power, it remains at zero for at least 8 minutes
This prevents excessive on/off cycling on EVs
How do I configure and enable load management?
The Energy Management System (EMS) is disabled by default for all new systems.
In XENON, go to Energy Management Configuration for the system
Configure all grid connection parameters (maximum power, safety margin, fallback) under Import Power Limit
The phase rotation, maximum input power and EVSE-ID is set by clicking on each EVCS in the list view and updating its settings
Note: For AC chargers, always verify the phase rotation setting matches the physical installation. Incorrect phase rotation will cause inaccurate load measurements and may result in the connection point being overloaded.
Select the appropriate load management (Dynamic or Static) and activate EMS
Once the configuration is saved, EMS is active
What are the limitations of load management?
The EMS controls charging power indirectly by sending setpoints to each EVCS — it does not communicate with EVs directly, and cannot guarantee that an EV will follow the setpoints it receives