> For the complete documentation index, see [llms.txt](https://docs.voltmasters.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltmasters.io/device-integrations/energy-meters/acrel.md).

# Acrel

Our EMS supports integration with energy meters from Acrel.

Acrel builds DIN-rail power measurement devices for commercial and industrial installations. The **ADL400** is a three-phase energy meter that communicates with our EMS over Modbus and provides the measurement data needed for monitoring and control.

### Supported devices

* **ADL400**: three-phase DIN-rail energy meter with Modbus communication

{% hint style="info" %}
**Default slave ID**

The ADL400 leaves the factory on slave ID 1 and accepts 1 to 254. The installations we have seen so far are commissioned on **40**, so our EMS proposes 40 when you add the meter. Make sure the value matches the address configured on the meter itself.
{% endhint %}

{% hint style="warning" %}
Set the voltage and current transformer ratios on the meter before you add it. Our EMS reads the primary-side values, so the meter has to apply the PT and CT ratios itself. A meter left on the default ratios reports the wrong power and energy figures.
{% endhint %}

### What the meter reports

* Voltage and current per phase
* Active power per phase and total active, reactive and apparent power
* Power factor per phase and total power factor
* Grid frequency
* Voltage imbalance and current imbalance
* Cumulative imported and exported active energy

### EMS functionality

With the current integration, our EMS enables:

* Accurate measurement of grid and sub-circuit energy flows
* Real-time monitoring of power, energy and power quality data
* Use of the meter as a reference point for control strategies such as peak shaving and capacity management

Additional functionality may be added over time as integration capabilities evolve.


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