Supplement: Power
Powering the next generation of fast and megawatt charging
As global demand for high power EV charging accelerates, LEM is stepping forward with metering solutions designed to unlock faster deployment, greater accuracy, and trusted billing for everything from passenger EVs to megawatt class heavy duty fleets. Florent Balboni, LEM’s global product manager for EV charging and energy metering solutions, explains the motivation, technology, and future impact behind the new DCES600 and DCES1500 meters.
What was the motivation behind developing the new DCES600 and DCES1500 meters?
We developed the DCES600 and DCES1500 energy meters primarily to enable faster time-to-market for electric vehicle charging infrastructure, particularly for DC fast chargers for passenger cars and e-trucks, up to megawatt-class chargers.
Our motivation largely stemmed from the accelerating need for precise kWh billing combined with the need for robust systems next-generation electric vehicle charging. Ensuring accurate and trusted measurement across diverse charge levels and operating conditions – such as voltage, current, temperature – were essential considerations in our development work. Our goal was to help charger manufacturers accelerate time to market and focus on their own constraints, without making any compromise on meter performance under all conditions or on the trustworthiness of the measurements. The bottom line is that fast charging in megawatt class is crucial for the advancement of heavy-duty vehicles and future high- capacity EVs.
Also, real-time reporting of voltage, current, temperature, and energy, enables system diagnostics and management for ensuring equipment is within safe operating limits. Their high accuracy is maintained across the entire current range, ensuring precise measurements throughout the full charging cycle, from high currents at the start to low currents near completion.
How will these products help charger manufacturers bring fast and megawatt charging solutions to market more quickly?
The cost of transportation is directly influenced by the accurate reporting of the energy delivered during charging. Therefore, when
36 December/January 2026
LEM DCES600 (closed)
an OEM integrates a certified meter, they gain all the benefits of functionality, accuracy, and trust in the measurements which enables the safe deployment of an energy billing system across their charger fleet.
These new meters mean that charger manufacturers can cover a wide spectrum of use cases (from passenger EVs, to heavy-duty fleet charging, up to megawatt charging) without constantly having to redesign around a wide range of sometimes multiple measurement solutions.
Furthermore, OEMs don’t have to over- engineer extra protection or cooling systems, which reduces design complexity and cost.
Why is accuracy in kWh billing so important, especially when it comes to heavy-duty vehicle charging?
Let’s use an example of a passenger EV, which might take 40–80 kWh per charging session. A heavy-duty truck or bus, on the
Components in Electronics
LEM DCES1500 (open)
other hand, could consume 300–1,000+ kWh in a single charge. At those session rates, even a 1–2 per cent error can add up very quickly.
This is partly because although heavy duty vehicles draw very high initial currents, charging tapers down toward the end and it’s well known that inaccurate meters are at their worst at low current, which is where expensive inaccuracies begin to occur. However, certified meters like the DCES600/DCES1500 maintain accuracy from peak to taper, ensuring every kWh is accounted for, thus avoiding the pitfalls of under-billing, which is a direct loss of review, and over-billing which is when complaints from customers start damaging an energy supplier’s reputation.
The meters include cybersecurity features and APIs, how do these benefit customers?
The features and APIs in the DCES600 and
DCES1500 meters include data integrity and tamper protection in the form of digital signatures that prevent billing data manipulation. This ensures that all- important kWh records are accurate and legally defensible, protecting both operators and end-users.
The meters also offer secured firmware updates, which not only minimises the risk of malware or tampering but also ensures long- term compliance with evolving regulatory standards.
Equally important is that the DCES600 and DCES1500 prevent unauthorized access or data manipulation, which safeguards revenue streams, especially in high-power megawatt charging scenarios or heavy-duty vehicles fleet. Standardised APIs provide for much faster integration that in turn give access to real-time voltage, current, energy, temperature, and diagnostics information. This vastly reduces the development time
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