WiFi HaLow Energy Meter for European Energy Retrofit & Sub-metering

Language

Home > News > Solutions > ADL200W & ADL400W WiFi HaLow Meters + AWT100-AP Gateway: Wireless Energy Monitoring for European Projects

ADL200W & ADL400W WiFi HaLow Meters + AWT100-AP Gateway: Wireless Energy Monitoring for European Projects

Sep 17, 2026

Energy retrofit and sub-metering projects across Europe face common challenges: thick reinforced concrete walls, large factory premises, scattered distribution cabinets, and expensive wired cable retrofits. Traditional 2.4GHz WiFi often suffers from weak signal penetration, while wired RS485 installation requires costly cable routing and construction downtime. Acrel's ADL200W single-phase and ADL400W three-phase WiFi HaLow energy meters, paired with the AWT100-AP WiFi HaLow gateway, deliver a robust sub-GHz wireless energy monitoring solution widely adopted in European industrial, commercial and distributed PV projects.

1. Solution Overview: Sub-1GHz Wireless Energy Monitoring

(1) ADL200W & ADL400W DIN-rail meters

Acrel ADL200W and ADL400W series DIN-rail meters adopt WiFi HaLow (IEEE 802.11ah) sub-1GHz wireless technology. ADL200W is designed for single-phase circuits, and ADL400W for three-phase 230/400V systems. Both meters support dual-circuit bidirectional energy measurement, high-speed electrical parameter sampling, built-in RS485 Modbus-RTU, and wireless data transmission via WiFi HaLow. The meters track voltage, current, active/reactive power, power factor and bidirectional kWh, supporting millisecond-level anti-reverse power control for solar and energy storage systems.‘

(2) AWT100-AP EU gateway: the wireless coordinator

The AWT100-AP EU version gateway acts as the central wireless coordinator. Operating on the EU 859–894MHz sub-GHz band, it features superior wall penetration and longer transmission range compared to standard WiFi. In factory environments, stable wireless communication can reach up to 150 meters, penetrating multiple concrete walls and across several floors. One AWT100-AP gateway can network with multiple ADL200W / ADL400W meters, collecting energy data and forwarding it to local EMS or cloud IoT platforms via Modbus TCP / MQTT. All hardware is CE, CE-RED and RoHS certified, fully compliant with European electrical regulations.

2. Real European Project Applications

(1) Factory energy sub-metering & electrical retrofit

Many European manufacturing plants carry out energy audit and retrofit projects to meet EU EPBD carbon reduction requirements. Old workshops have dispersed power cabinets and complicated wiring; running new communication cables is disruptive and costly. ADL200W and ADL400W WiFi HaLow meters are installed on branch circuits of workshop distribution panels, fitted with split-core CTs for non-intrusive installation without cutting off main power. Meters transmit energy readings wirelessly to the AWT100-AP gateway placed in the main electrical room. The gateway aggregates all branch energy data and uploads to the customer's energy management platform.

Project benefits: no new communication cables, drastically cutting construction time and retrofit cost; real-time branch power consumption tracking; energy consumption split by workshop, production line and shift for carbon accounting; stable wireless connection even in metal cabinets and reinforced concrete factory buildings.

(2) Balcony PV & commercial distributed solar projects

Germany, France and other EU countries have booming balcony solar and commercial rooftop PV markets. ADL200W handles single-phase balcony solar systems, while ADL400W serves three-phase commercial PV and hybrid energy storage systems. The meters provide accurate bidirectional metering and fast anti-reverse flow control to avoid grid penalties, with MID-certified options available for official energy settlement. WiFi HaLow solves signal attenuation issues when meters are mounted in basement or outdoor distribution boxes, where regular WiFi cannot reach.

(3) Public building energy monitoring

The solution has also been deployed for municipal buildings, schools and healthcare facilities across Europe. Multi-floor buildings with thick walls often block conventional wireless signals. The long-range, strong-penetration WiFi HaLow network enables unified collection of power consumption across every floor and tenant circuit for municipal energy efficiency programmes.

3. Key Advantages of the WiFi HaLow System

(1) Superior wireless performance: Sub-1GHz WiFi HaLow, 2× longer range and 3× better wall penetration than 2.4GHz WiFi, ideal for factories and multi-storey buildings.

(2) Simple installation: DIN rail mounting, split-core CT option, wireless networking, minimal site disruption.

(3) Flexible integration: Support Modbus-RTU, Modbus TCP and MQTT, easy to connect to third-party EMS, IoT and carbon management platforms.

(4) European compliance: CE, CE-RED, RoHS; MID certified meter variants available for billing-grade metering.

(5) Scalable architecture: Single AWT100-AP gateway supports multiple ADL series meters, easy expansion for large retrofit phases.

4. Summary

Acrel ADL200W / ADL400W WiFi HaLow energy meters plus AWT100-AP gateway form a proven wireless energy monitoring stack for European factory retrofits, distributed PV and public building energy projects. This wireless sub-metering solution eliminates expensive wired cabling, maintains reliable data transmission in harsh industrial building environments, and helps European asset owners achieve energy transparency, carbon reporting and energy efficiency targets.

Contact our team for datasheets, demo access and project-specific configuration.