Maturity status | Stable |
This article explains how Static Load Management (SLM) works, when to use it instead of Dynamic Load Management (DLM), and how to configure it.
What is Static Load Management?
Static Load Management (SLM) limits the total charging power of all connected EV charging stations (EVCS) to a fixed maximum value. Unlike Dynamic Load Management (DLM), SLM does not require a grid meter at the Grid Connection Point (GCP).
SLM uses the sum of power reported by all controllable EVCSs as its reference measurement instead of a GCP meter. This means SLM cannot react to changes in uncontrollable load such as building consumption.
How does SLM aggregate asset measurements?
For each controllable asset, SLM uses the maximum of the actual power measurement and the last sent setpoint as its power estimate. This conservative approach ensures the total aggregated power never underestimates actual consumption — reducing the risk of exceeding the configured limit even when measurement reporting is delayed or irregular.
When should I use SLM instead of DLM?
Use SLM only when no grid meter is installed at the GCP.
If a grid meter is available, use DLM instead. DLM provides more accurate control and has clearly defined behavior when uncontrollable loads change. If SLM is configured but a grid meter is present, the system behaves like DLM but controls against the SLM limit — this can result in very little charging power available when uncontrollable load is high.
What are the hardware requirements for SLM?
SLM uses the same general load management requirements but does not require a grid meter at the GCP.
For AC chargers, correct phase mapping is required for load management to optimize per-phase power distribution. DC chargers do not require phase mapping. See Phase Allocation per Charging Point.
What parameters do I configure for SLM?
Configure SLM parameters in the System Details tab in the XENON Dashboard.
Maximum power at Grid Connection Point
The fixed maximum power limit for all controllable assets combined
Set this below the actual fuse limit to account for expected uncontrollable load
This limit applies regardless of whether a grid meter is present
Safety margin below the maximum power at GCP
A buffer below the maximum limit — same behavior as in DLM
Recommended: 10% of the configured maximum power
Fallback in case of metering failure
Not used for SLM systems, even when a grid meter is present
Recommended: leave unset, or set to the same value as the maximum power limit to avoid confusion during troubleshooting
How do I configure SLM in XENON?
In XENON, go to the System Details tab for the site
Under the product selection, choose Static
Configure the maximum power at GCP and the safety margin
Activate the Energy Management Control toggle (see Load Management for details)
What are the limitations of SLM?
SLM cannot measure or react to uncontrollable load — building consumption is not accounted for
Overloads are not completely ruled out, since uncontrollable load is excluded from the calculation
Response time is slower than DLM — power measurements are aggregated from individual EVCS rather than a single GCP meter
SLM is suitable only for sites with minimal or predictable residual load
The conservative measurement approach (max of measurement and setpoint) may cause available charging power to be underestimated, resulting in less power being distributed than the limit would allow
For sites with multiple sub-distributions or cascaded fuses, see Load Management for Clusters.