3- to 1-phase switching with Zaptec Go 2

✅
Zaptec Go 2 chargers support switching between three-phase and one-phase charging.

The charger must be wired with 3 phases and be part of a three phase installation

The charger must be online

The charger must not be in standalone mode

The charger must not have OCPP 1.6J Native authentication enabled

Automatic switching behavior using Zaptec power management

When starting a charging session

If the Available current on all three phases is above the 3 to 1-phase switch current, the charger will commence charging on all three phases.
Else, the charger will commence charging on one phase, using the phase connected to the charger's L1 terminal.

During a charging session

If the Available current on any phase drops below the 3 to 1-phase switch current, the charger will switch from three phase to one phase, and resume charging on the phase connected to the charger's L1 terminal.
If Allow chargers to return to three phase charging is enabled and the Available current on all phases rises above the 3 to 1-phase switch current, the charger will resume charging on all three phases.

🚧
some vehicles are unable to successfully switch from one to three phase charging during a session. If the_ charging circuit breaker operates, this feature must be disabled.

There is a limit on the number of times during a session that charging can be switched back to three phase. This is set by Switches allowed before locking to single phase.

The default limit is 5. The maximum limit is 20.

Controlling phase switching behavior in the Zaptec Portal

The Installation settings can be found in the Zaptec Portal under Installation > Settings > Power management
The Charger settings can be found in the Zaptec Portal under Charger > Settings

To enable automatic 3- to 1-phase switching

Set Installation *3 to 1-phase switch current to a value between 6A and 31A (default 8A)
Set Charger Max phases to 3

To enable automatic 1- to 3-phase switching

Check Installation Allow chargers to return to three phase charging

To adjust the automatic 3- to 1-phase switching threshold

Set Installation *3 to 1-phase switch current to the desired value

🚧
To avoid repeated switching between one phase and three phases when charging from a solar, the switching threshold should be set to a value above the maximum expected solar charging current. For example, for a 3-phase 6kW solar array, set this value to Maximum current per phase = 6000W / (230V × 3) ≈ 9A . In this case, setting the threshold to 9 will ensure that single-phase mode is always used when solar charging.
If the maximum expected solar charging current is unknown, we recommend setting this value to 8A.

To disable 3- to 1- phase switching at the installation level (and always make three phases available to the chargers)

Set Installation *3 to 1-phase switch current to 0A

To disable 1- to 3- phase switching at the installation level (and only make one phase available to the chargers)

Set Installation *3 to 1-phase switch current to 32A

To disable phase switching at the charger level and always charge with one phase

Set Charger Max phases to 1

Controlling phase switching behavior with the Zaptec API

Charger Max phases must be set to 3 in the Zaptec Portal, as described above

To allow chargers to return to 3-phase charging during a session, Allow chargers to return to three phase charging must be enabled in the Zaptec Portal, as described above
To ensure a stable charging experience, we recommend updating these settings no more than once every 15 minutes. Frequent changes may cause the vehicle to interrupt the charging session.
To control the phase switching behaviour dynamically, you can use the Zaptec API to update the installation settings. This will allow the Zaptec load balancer to act based on the values set.
Refer to the official documentation for a detailed description of the API endpoints.
To charge with three phases
Use https://api.zaptec.com/api/installation/{id}/update to set threeToOnePhaseSwitchCurrent to 0
To charge with one phase
Use https://api.zaptec.com/api/installation/{id}/update to set threeToOnePhaseSwitchCurrent to 32
To allow the Zaptec load balancer to automatically select 1- or 3- phase charging
Use https://api.zaptec.com/api/installation/{id}/update to set threeToOnePhaseSwitchCurrent to a value between 6 and 31

🚧
To avoid repeated switching between one phase and three phases when charging from solar, the switching threshold should be set to a value above the maximum expected solar charging current. For example, for a 3-phase 6kW solar array, set this value to Maximum current per phase = 6000W / (230V × 3) ≈ 9A . In this case, setting the threshold to 9 will ensure that single-phase mode is always used when solar charging.
If the maximum expected solar charging current is unknown, we recommend setting this value to 8.