Etrel Wallbox

Use cases

• Monitor real-time charging status and per-phase power consumption on a live ModbusCloud dashboard.
• Log session energy and duration data over time to generate monthly charging reports for customers.
• Set target charging current remotely to implement basic load management during peak hours.
• Create an alert when charging status changes unexpectedly or a phase voltage drops below threshold.
• Restart the charger remotely via ModbusCloud after a fault without requiring a site visit.
• Track power factor and per-phase current to identify potential wiring or load balancing issues.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the Etrel wallbox.
2. 2Ensure Modbus TCP is enabled on the Etrel wallbox and note its IP address and Modbus TCP port.
3. 3Verify the firmware version on the Etrel wallbox, as byte order for 32-bit floating values changed in v1.0.2.
4. 4In the ModbusCloud portal, import the Etrel Wallbox template and configure the IP address and port of the wallbox.
5. 5Confirm that live readings such as charging status, voltage, and current appear correctly on the dashboard.
6. 6If readings appear incorrect, check that the template version matches the wallbox firmware version regarding byte order.

Things to watch for

01

Voltage or power readings appear as very large or very small incorrect numbers. What is wrong?

The register byte order for 32-bit floating point values changed in Etrel firmware v1.0.2. Ensure your wallbox firmware version and your ModbusCloud template version match. A byte order mismatch causes garbled float values.

02

Can I adjust the charging current remotely?

Yes. The target current and EV max phase current registers are writable. You can set these values from ModbusCloud to control the charging rate dynamically.

03

Which Etrel models are supported by this template?

The template is compatible with the Etrel Inch Home and Etrel Inch Pro. Both models use the same Modbus TCP register map.

04

The gateway cannot connect to the wallbox over Modbus TCP. What should I check?

Verify that the wallbox and the ModbusCloud gateway are on the same network or VLAN. Confirm that Modbus TCP is enabled in the wallbox settings and that the correct IP address and port are configured in the template.

Registers (21)

19 read / 7 write

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