Acrel ADL200W / ADL400W WFH Wi-Fi HaLow Wireless Anti-Reverse-Flow Energy Meters

Ideal Matching Meter for Residential PV, Balcony Micro-Inverters & Household Energy Storage OEM Manufacturers

1 Industry Pain Points of Traditional PV & Storage Anti-Reverse-Flow Matching

For European & Latin American residential rooftop PV, balcony micro-PV, all-in-one PV-storage systems, strict grid codes (VDE-AR-N 4105, local anti-feed regulations) require zero power backflow to public grid, which brings huge pain points for inverter/energy storage factories and installers using conventional wired meters:

1. Wired RS485 layout brings high construction cost Old villas, apartment balcony micro-PV have reserved wiring tunnels unavailable; drilling and cable laying increase labor time and cost, delayed project delivery.
2. Slow data refresh causes reverse power penalty Ordinary wired meters refresh power data every 500ms+, slow feedback to inverters leads to power backflow to grid, triggering grid operator fines or system shutdown.
3. Complex on-site parameter debugging Technicians need to set Modbus address, baud rate, CT polarity manually; wrong settings break anti-reverse-flow closed-loop control.
4. 2.4GHz Wi-Fi poor penetration Conventional Wi-Fi signals are blocked by metal distribution boxes, concrete walls, resulting offline communication, invalid anti-reverse-flow regulation.
5. Single-loop meters cannot separate PV & grid power Cannot independently measure grid incoming load and PV generation, unable to achieve accurate power balance calculation for anti-reverse-flow logic.

To solve the above bottlenecks, Acrel launched ADL200W (single-phase) / ADL400W (three-phase) WFH Wi-Fi HaLow dual-circuit anti-reverse-flow energy meters, equipped with Sub-GHz long-distance wireless module, 50ms ultra-fast power sampling and one-click button pairing, forming closed-loop anti-reverse-flow linkage with inverters/EMS with nearly zero on-site commissioning.

2 Core: Millisecond Closed-Loop Anti-Reverse-Flow Control Function

2.1 Dual-circuit independent sampling core logic for anti-reverse-flow

The meter supports 1/2 groups of split-core CT, two independent measurement channels:

• Channel 1: Measure total grid inlet power (household total load)
• Channel 2: Measure PV/storage inverter output power Real-time compare power value and current direction, accurately judge surplus power that may flow back to grid.

2.2 50ms ultra-fast data refresh, meet EU zero backflow standard

All voltage, current, active power parameters update within 50ms, far faster than the 100ms response requirement of European grid standards. Once the meter detects reverse power trend, it instantly transmits real-time power data to the inverter via Wi-Fi HaLow Modbus-TCP, the inverter automatically reduces PV output power or triggers battery charging to consume surplus electricity, completely eliminate grid backflow risk and avoid grid penalty.

2.3 Bidirectional high-precision metering support anti-revenue settlement

Class 0.5S high accuracy, separately record forward grid consumption and reverse PV generation energy, clearly calculate self-consumption rate of household PV-storage system, provide legal billing data for distributed energy subsidy and peak-valley arbitrage.

2.4 Automatic CT polarity & phase sequence correction

Installers may reverse CT clamps or miswire phases on site; the meter self-identifies wiring error and calibrates calculation algorithm without re-disassembling wiring, guarantee anti-reverse-flow logic operates correctly under wrong wiring conditions.

3 Wi-Fi HaLow Unique Advantages for Distributed Household PV & Storage

Different from traditional 2.4G Wi-Fi and LoRa modules, 730–950MHz Sub-GHz Wi-Fi HaLow brings exclusive strengths for residential anti-reverse-flow projects:

1. Super wall & metal cabinet penetration Low-frequency signal strong diffraction, stable cross-floor transmission for multi-story villas, no signal loss in metal distribution boxes, guarantee continuous anti-reverse-flow data feedback.
2. Native Modbus-TCP/HTTP protocol, direct linkage with inverter EMS No extra protocol converter or gateway needed, simplify OEM docking development work for inverter manufacturers.
3. Low power sleep mechanism, 24h stable monitoring TWT sleep technology reduces standby power consumption, continuous real-time power sampling without offline, ensure uninterrupted anti-reverse-flow control all day.
4. Mass cluster networking capacity One AWT100-AP HaLow access point supports hundreds of household meters online simultaneously, suitable for large residential district centralized PV anti-reverse-flow management.

4 One-click Button Pairing: Nearly Zero On-site Debugging

The biggest competitive edge for inverter OEM matching: wireless one-to-one pairing without complex parameter configuration

Simple Operation Steps

1. Short press the function key on ADL meter for 3s to activate temporary HaLow hotspot (auto close after 5min);
2. Short press pairing button of AWT100-STA module pre-installed on inverter;
3. Automatic matching finish within 10 seconds, no manual setting of IP, baud rate, Modbus address;
4. After pairing completed, dual-circuit power data real-time two-way transmission, anti-reverse-flow closed-loop control activate automatically.

No professional electrical technician required, ordinary installers finish pairing within 2 minutes, drastically cut after-sales commissioning labor cost for PV/storage manufacturers.

5 Complete Product Portfolio for All PV & Storage Scenarios

ADL200W-CT/WFH Single-phase Wi-Fi HaLow Anti-reverse-flow Meter

• Grid: Single-phase 230V, suitable for single-family villas, balcony micro-PV, single-phase all-in-one household energy storage
• CT options: φ10 / φ16 split-core current transformer, 1 or 2 CT groups optional
• Dual-circuit sampling, 50ms power refresh, full anti-reverse-flow closed-loop linkage
• Slim 1P DIN rail design, fit compact household distribution boxes

ADL400W-CT/WFH Three-phase Wi-Fi HaLow Anti-reverse-flow Meter

• Grid: 3×230/400V three-phase, for large villas, small commercial rooftop PV, three-phase household energy storage
• Three-phase full electrical parameter measurement, dual-circuit independent power sampling
• Support heavy-load anti-reverse-flow control for high-power three-phase hybrid PV-storage system

Matching HaLow Gateway AWT100 Series

• AWT100-STA: STA module embedded inside inverter, one-click paired with ADL meter
• AWT100-AP: Centralized AP collector for residential community cluster PV, aggregate hundreds of meter data and upload to energy cloud for unified anti-reverse-flow monitoring

6 Full International Certifications for Overseas OEM Export

All ADL-WFH series pass SGS authoritative testing and global market certifications, fully meet European & Latin American grid anti-reverse-flow project acceptance requirements:

1. CE-EMC & CE-RED certified (SGS EN IEC 61326 test report attached)
2. RoHS & SVHC hazardous substance compliance, qualify EU household new energy market access
3. Class 0.5S high precision bidirectional metering, meet distributed PV grid measurement standards
4. Wide operating temperature -20℃ ~ +70℃, adapt tropical Latin America and cold European residential environments
5. IP51 front panel protection, long-term stable indoor cabinet operation

7 Core Matching Application Scenarios

1. Single-phase residential rooftop PV + storage anti-reverse-flow system
2. Balcony micro-inverter distributed small PV projects
3. All-in-one household PV-storage hybrid energy equipment
4. Three-phase villa & small commercial rooftop power self-consumption system
5. Large residential district cluster distributed PV centralized anti-backflow management
6. Off-grid/grid-tied household energy storage cabinet supporting meter

8 Why PV & Storage OEMs Choose Acrel ADL-WFH Anti-reverse-flow Meters

1. Wireless scheme eliminate wiring cost, one-click pairing zero debugging Cancel RS485 cable construction; installers complete pairing without professional parameter setting, greatly reduce project labor and after-sales troubleshooting.
2. 50ms ultra-fast sampling guarantee zero grid backflow Real-time power data instant feedback to inverter, fully comply with European anti-feed grid regulations, avoid user penalty losses caused by power reverse flow.
3. Wi-Fi HaLow solve signal shielding pain point of residential metal cabinets & multi-story buildings Compared with ordinary 2.4G Wi-Fi, Sub-GHz frequency realizes stable signal transmission in complex housing environments, anti-reverse-flow control will not fail due offline communication.
4. Complete one-stop supporting solution Meters + AWT100 Ha gateway full set matching, provide complete English datasheet, manual, test report and certification documents for OEM customs clearance and third-party inspection.
5. A-share listed stable mass supply Acrel self-owned intelligent manufacturing base, support customized model codes, communication protocols, housing printing for global inverter and energy storage brands.

Cooperation Invitation

For global PV inverter, micro-inverter and household energy storage manufacturers searching reliable anti-reverse-flow supporting metering equipment, Acrel ADL200W / ADL400W WFH Wi-Fi HaLow wireless energy meters deliver wireless wiring, one-click pairing and millisecond anti-backflow closed-loop control. We provide sample testing, protocol docking customization, full certification documents and bulk stable supply to jointly develop the booming distributed residential PV & energy storage market.

Summarize

Acrel ADL200W / ADL400W WFH Wi-Fi HaLow Anti-Reverse-Flow Meters

Perfect Supporting Meter for Residential PV & Household Energy Storage OEM

• Dual-circuit independent sampling, 50ms ultra-fast power refresh, closed-loop anti-grid backflow control
• Wi-Fi HaLow Sub-GHz long-distance wireless, strong wall penetration, no RS485 wiring required
• One-click meter-inverter button pairing, nearly zero on-site commissioning
• Class 0.5S bidirectional high-precision metering, calculate PV self-consumption accurately
• CE-RED / CE-EMC / RoHS certified, single/three-phase models available
• Matched AWT100 AP/STA gateway for community cluster PV anti-reverse-flow monitoring
• Comply with EU grid zero backflow standards, ideal matching device for global inverter manufacturers