Maturity status | Stable |
This article explains what power limit schedules are, how they work, and how to configure them in the XENON Dashboard.
What are power limit schedules?
Power limit schedules let operators configure a maximum power import limit for specific times of day. The limits are automatically applied by the EMS.
Power limit schedules are an extension of load management. The scheduled limit can only reduce the available charging power. If the scheduled limit is higher than any other limit applied to the system, the most constraining limit takes effect.
How do power limit schedules work?
The scheduled limit is applied as a total power limit. All EVCSs are controlled to ensure that the limit is respected.
Multiple schedules:
If multiple schedules are active at the same time, the lowest limit applies
Safety margin calculation:
When a schedule reduces the import limit, the safety margin is calculated to 10% of the scheduled limit
This prevents the margin from consuming a disproportionate share of the reduced limit
Example: a site that receives a 100 kVA scheduled limit will apply a 10 kVA margin, allowing up to 90 kVA total import power
Offline behavior:
If the gridBox loses connection to XENON, all previously fetched schedule intervals remain valid
By default, schedule intervals are fetched 14 days ahead
Meter failure behavior:
During a grid meter failure, scheduled limits continue to apply. The EMS substitutes the aggregated EV measurement and the estimated uncontrollable load — derived from the DLM fallback value — in place of the real GCP measurement. This ensures the scheduled limit is still respected even when meter visibility is lost.
How do I configure power limit schedules?
In XENON, go to Energy Management Configuration for the system
Navigate to the Power Limit Schedules icon and click on the + to add a schedule
Configure the details of the schedule
Save the schedule
