# Autel MaxiCharger

> Supported devices: Autel MaxiCharger AC Single (A22), steered on power over Modbus TCP, with an optional fallback power when communication is lost.

Source: https://voltmasters.io/en/docs/device-integrations/ev-chargers/autel/

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.

> **Note**
>
> The MaxiCharger AC Single is available from EMS controller version **0.0.339**.

## Supported devices

| Model | Power | Current type | Connectors |
| --- | --- | --- | --- |
| MaxiCharger AC Single (A22) | 7.4 to 22 kW | AC | 1 |

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.

> **Note**
>
> **Fallback on a lost connection**
> 
> The fallback is optional. With a **Fallback setpoint** filled in, the EMS writes that power as the offline limit of the charger, together with a communication timeout of 60 seconds. When the charger hears nothing from the EMS for 60 seconds, it charges at that power until the EMS takes over again. Without a fallback setpoint, the EMS leaves the offline settings of the charger as they are.