Autel MaxiCharger

Our EMS steers the Autel MaxiCharger AC Single (A22) over Modbus TCP: the charging power is limited together with the rest of the site, within the limit of the grid connection.

Supported devices

One integration covers the whole A22 series: every variant reports its own maximum charging power, and the EMS never allocates more than that.

How the integration works

• Charging power control: the EMS keeps the charger in power mode and writes a power limit to the connector. If the charger drops back to current mode, the EMS sets power mode again.
• Pause and resume: the AC Single has no start or stop command, so a pause writes a limit of 0 W. While the pause holds and the car stays plugged in, the connector shows as suspended by the charger.
• Load balancing: the charger takes part in the site load management, per connector.
• Monitoring: charging state, voltage, current and power per phase, and the energy counter are read back and shown on the device page and in the EV charging dashboard.
• Incidents: a lost Modbus connection, a faulted connector and a charger that does not apply the EMS limits (it stays out of power mode, or keeps a different power limit for more than 30 seconds) are raised as incidents.

Setup

1. Network

   Connect the charger to the same network as the Voltmasters Controller and give it a fixed IP address. Make sure Modbus TCP is enabled on the charger and that the controller can reach it on port 502.

2. Add the charger in the platform

   Add a device of type EV charger, with brand Autel and model MaxiCharger AC Single (A22). Fill in the IP address, port 502, and check the prefilled Slave ID 1.

3. Set a fallback power (optional)

   In the device settings, fill in the Fallback setpoint if the charger should fall back to a fixed power when it loses the connection with the EMS (see below).

4. Verify

   Start a charging session and check on the device page that the charging state and power come in, and that the charger follows a lowered limit.