Load balancing

Load balancing distributes the available power among the chargers in a zone, so the site never exceeds its grid limits while connected vehicles get the best possible power. Two distribution styles are available: Dynamic shares power across all active sessions in real time, and Sequential creates a first-come, first-served queue.

Before you start: voltage system and power configuration

Load balancing needs to know the site's electrical layout and each charger's capabilities. Set these up first.

Select the location's voltage system

The voltage system describes the electrical configuration supplying the location, and it decides whether zones and chargers are treated as single-phase or three-phase:

3-phase 400V/230V - EU
3-phase 480V/277V - US Industrial
3-phase 208V/120V - US Commercial
1-phase 240V - Residential

You are asked to select it the first time you save a charger's power configuration at a location that has none yet (the Location voltage system field). You can change it later from the location's charger list: the Voltage system panel has an Edit button.

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After changing the voltage system, review all load balancing zones at the location to ensure they are still configured correctly. Switching between single-phase and three-phase changes what the zones' limits mean.

Enable power configuration on each charger

Open the charger in the Edit Charger form and enable the Power configuration toggle. This tells the platform how the charger is wired and how much current it may draw:

Config type:
- Single: draws current from only one phase.
- Split: draws current from two phases simultaneously.
- 3-phase: uses L1, L2, and L3 evenly.
Phase wiring: which phases the charger is connected to (L1, L2, or L3 for single; L1-L2, L1-L3, or L2-L3 for split; L1+L2+L3 for 3-phase).
Max current (A): the charger's maximum current draw.
Max power (kW): calculated for you from the voltage system, max current, and phase count.

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A charger can only be added to a load balancing zone once its power configuration is enabled. If a charger is missing from the zone's charger picker, that is the first thing to check.

Getting the phase wiring right matters: if your electrician spread single-phase chargers across L1, L2, and L3, telling the platform which charger sits on which phase is what makes per-phase balancing accurate.

Creating a load balancing zone

Open the location's Load balancing tab and click Add new zone.

Choose the limit type

LIMIT TYPE selects the limit unit supported by your chargers: kW or Ampere.

kW zones

Zone name: a name for the charging area.
Meter Number: the serial number of the meter measuring the zone's consumption, provided by your electric utility. Optional; note that a zone with a meter number cannot use scheduled limits.
Maximum grid capacity: the total power available for charging in the zone, in kW.
Minimum session power: the minimum power per charging session, so no session is starved below a useful rate.
Grid capacity buffer: a percentage of capacity held back as a safety margin for grid fluctuations and other on-site consumption. We recommend at least 10%. Example: with 3600 kW capacity and a 10% buffer, 3240 kW is available for charging.

Ampere zones (phase-aware)

Ampere zones balance per electrical phase:

MAXIMUM CURRENT LIMIT: input the breaker rating. The limit applies per phase, with separate inputs for Phase 1 (L1), Phase 2 (L2), and Phase 3 (L3) on three-phase locations.
MINIMUM CURRENT LIMIT: the minimum current allowed for each charger in the zone.
Grid capacity buffer: as above, held back per phase.

The zone form shows a live per-phase allocation table as you select chargers, so you can see how their phase wiring adds up against each phase's limit before saving.

Load distribution

Dynamic: evenly shares available power across all active connectors, recalculating as sessions start and stop. Respects each connector's configured maximum and the zone's minimums.
Sequential: a first-come, first-served virtual queue. Earlier sessions receive full power (up to connector limits) until the zone limit is consumed; later sessions get any usable leftover or wait idle until capacity frees up. When a session ends, its power is reassigned to the next in line.

Example (sequential): site capacity 100 kW, 10% buffer, so the zone limit is 90 kW, with six 22 kW chargers. Sessions 1 to 4 receive 22 kW each (88 kW total), 2 kW remains, session 5 waits for capacity unless sub-rated allocation is possible, session 6 waits.

Select the chargers

Pick the chargers that belong to the zone under Select Chargers. If a charger is not listed, it may already belong to another load balancing zone, not support smart charging, or its power configuration may not be enabled in the Edit Charger form.

Zone status

Zones can be Enabled or Disabled without deleting their configuration.

Scheduled limits

Enable Set schedule to give the zone different limits at different times, for example a lower daytime limit while the site's other consumers are active and full capacity at night:

Add time rows with From and To (in the location's timezone) and the GRID CAPACITY (kW zones) or CURRENT LIMIT (Ampere zones) for that window.
Pick the weekdays under REPEAT SCHEDULE ON.
The zone's maximum grid capacity applies to all time intervals you leave unset.

Scheduling is available for zones without a Meter Number.

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Charging schedules on home and private chargers (start/stop windows for cheap tariffs) are a separate feature and have nothing to do with zone limits.

Phase monitoring

For Ampere zones, the location's Overview tab and the zone list show a live Phase monitoring strip per phase:

Load: the share of usable capacity currently allocated, and the usable amperage.
Buffer: the amperage held back by the grid capacity buffer.
Breaker: how close the allocation is to the breaker rating, and the rating itself.

A phase turns red when its load exceeds 100%, telling you at a glance which phase is the bottleneck.

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If the zone list warns that chargers are not assigned to any zone, bind them: unassigned chargers draw power outside the zone's control.

Common questions

Why can't I select my charger in the zone? It may already belong to another zone, not support smart charging, or its power configuration is not enabled in the Edit Charger form.

Should I use kW or Ampere limits? Use the unit your chargers support (the LIMIT TYPE help text in the form). Ampere zones additionally balance per phase and unlock the phase monitoring view, which is the right choice when single-phase chargers are spread across L1, L2, and L3.

What does the buffer do? It reserves a share of the capacity (we recommend at least 10%) for grid fluctuations and other consumers on the site, so charging never pushes the connection to its absolute limit.

Can the site have a lower limit during business hours? Yes: enable Set schedule on the zone and define time windows with their own capacity or current limit, repeated on the weekdays you pick.

What is the difference between dynamic and sequential? Dynamic splits available power across everyone charging; sequential gives full power in arrival order and queues the rest.

Why does my zone only show one phase? The location's voltage system is single-phase. Change it via the Voltage system panel on the location's charger list if the site is actually three-phase, then review the zone limits.