Smart Metering Terminal for PV & EV Charging Piles | One-Stop Refined Energy Management Solution
24 Jul 2026
With the advancement of the dual-carbon strategy and large-scale construction of new energy stations, distributed photovoltaic systems and public EV charging stations are commonly plagued by inaccurate metering, cumbersome data collection, untraceable bidirectional electric energy, and difficult remote operation & maintenance. The Acrel ADW300 DIN-rail IoT wireless energy meter is specially developed for PV grid-connection and EV charging pile scenarios. Integrating high-precision metering, full electrical parameter monitoring, multi-mode wireless communication and frozen energy data storage, it has become the standard intelligent monitoring terminal for new energy projects.
Equipped with a Class 0.5S high-precision metering chip, the ADW300 supports four-quadrant bidirectional energy measurement. It perfectly adapts to the self-consumption and surplus power grid-feed mode of PV systems, accurately calculating forward mains power consumption and reverse PV power generation. It eliminates undercounting or miscounting of reverse PV power, and fully meets the data requirements of energy audits, electricity settlement and carbon accounting. The device collects real-time three-phase voltage, current, power, power factor, 2nd to 31st harmonics and three-phase unbalance ratio. It also monitors cable node temperature and residual leakage current. Once overvoltage, overload, excessive harmonics or cable overheating occurs, alarm signals will be uploaded automatically, preventing burnout of PV inverters and charging pile power modules and greatly reducing potential safety hazards of power stations.
To meet the time-of-use billing and peak-valley settlement demands of charging piles, the ADW300 features 15-minute energy freezing, with minute, daily and monthly multi-level data storage to retain complete annual power consumption records. Every kilowatt-hour of charging power can be traced precisely, completely resolving billing disputes at charging stations. Adopting standard 35mm DIN-rail mounting design with compact size, it can be directly installed inside charging pile distribution boxes and PV grid-connected cabinets. Matched with split-core current transformers, it can be quickly retrofitted without power cut, and no large-scale wiring renovation is required for new or existing stations.
Multi-mode communication is a core advantage of the ADW300. It is standardly equipped with RS485 wired communication, with optional LoRa, NB-IoT, 4G and WiFi wireless modules. For scattered rooftop PV systems and outdoor charging piles, no network cable laying is needed, and data can be stably transmitted over long distances to the energy management cloud platform. Operation and maintenance staff can remotely read meter data, adjust parameters and check faults via desktop backend or mobile mini-programs, eliminating on-site manual inspections and cutting O&M costs by over 60%. Built-in Bluetooth enables on-site parameter configuration via mobile APP without laptops, greatly improving construction efficiency.
For distributed PV power stations, the ADW300 monitors PV outgoing circuits, grid connection points and factory load loops separately, intuitively displaying PV self-consumption ratio to guide enterprises to optimize power consumption periods and maximize PV revenue. For urban public charging parks, one meter can correspond to multiple charging terminals to calculate energy consumption of each device separately, realizing automatic time-of-use tariff calculation and accurate revenue allocation. In addition, the device has passed EMC electromagnetic compatibility certification, and can operate stably for a long time under harsh outdoor conditions with wide temperature variation and strong electromagnetic interference.
From bidirectional PV power statistics to refined billing for EV charging piles, the ADW300 covers the full link of "data collection-transmission-analysis-management" with three core strengths: precise metering, wireless remote transmission and safety early warning. It enables digital and intelligent energy management for PV and charging pile projects, and provides reliable hardware support for green and low-carbon operation.
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