LEM Launches High Accuracy DC Meters for Fast EV Charging

LEM, a Swiss measurement specialist, has recently unveiled a new series of DC energy meters — the DCES600 and DCES1500. These meters are specifically designed to cater to the evolving requirements of EV fast-charging and megawatt-class charging infrastructure. With a focus on high-accuracy energy billing and system management, the new meters offer precise sensing capabilities throughout the full charge cycle, enhanced cybersecurity features, and flexible integration options.

For readers of eeNews Europe involved in EV charger design, e-mobility infrastructure, or fleet electrification, the introduction of these meters presents a robust solution to the critical need for legally certified, scalable DC metering in high-current charging environments.

Enabling Next-Generation EV Charging Infrastructure

The DCES600 and DCES1500 meters have been engineered to support current levels of up to 1500 A without derating across a wide temperature range of –40°C to +85°C. This ensures accurate kilowatt-hour (kWh) billing throughout the entire charging cycle, including low-current phases often observed towards the end of a charge.

Both models comply with international metrology standards, setting the stage for regulatory approval across Europe, including MID 2014/32/EU and Germany’s Eichrecht. This compliance is particularly crucial for commercial EV fleets and megawatt charging hubs where billing accuracy and traceability are paramount.

LEM emphasizes that the meters’ full-cycle sensing performance is vital for applications such as electric trucks, where energy delivery precision directly impacts cost-per-kilometre. The company notes, “With the introduction of the DCES600 and DCES1500, LEM empowers DC charging infrastructure manufacturers to expedite time-to-market for both fast and megawatt charging solutions, complete with kilowatt-hour (kWh) billing services.”

Flexible Integration, Cybersecurity, and OEM Features

These meters connect via RS485 and are equipped with cybersecurity measures like digital signature-based measurement authentication and secure firmware update capabilities. These features are intended to facilitate secure remote maintenance and reduce charger operating costs over time.

LEM also provides APIs and software tools to streamline integration and testing processes. Optional remote display units (RDUs) enhance human-machine interface (HMI) design flexibility, enabling panel or DIN-rail mounting without the necessity for separate communication or power lines.

Mechanically, the meters are constructed for high-current usage, featuring reinforced housings and ample contact areas: the DCES600 includes M10 studs for 33 × 36 mm busbar contact, while the DCES1500 utilizes four M12 studs supporting a combined 45 × 100 mm interface.

Applications and Availability

The target applications for these meters encompass DC fast charging stations, where the DCES600 offers a compact and accurate solution for high-turnover charging points. Additionally, the DCES1500 is tailored to support heavy-duty vehicles, buses, and future ultra-high-capacity EVs at megawatt charging hubs.

• Fleet and depot charging scenarios benefit from the operational transparency and compliance features offered by both units.
• For OEM integration, the modular and secure design supports advanced system monitoring and battery storage integration.

Samples of the DCES series are currently available, with full regulatory certification anticipated by the end of the year. Manufacturers can begin the integration and certification processes promptly, as the meters will comply with major EU legal metrology requirements.