This is essential for providing charging infrastructure and for legally compliant billing. these requirements. With the completion of the certification, the meters are now available on the market.
Isabellenhütte currently offers various versions of the DC meter.
The IEM-DCR-125, with a current measurement range of 125 A and voltage of 1,000 V, is suitable for DC wall boxes.
The IEM-DCR-1000, with up to 1,000 A and an extended voltage range of 1,500 V, is designed for high-power charging up to 1.5 MW. It is the first meter on the market to cover the 1,500 V voltage class.
The IEM-DCR-1500, with 1,500 A and also a voltage range up to 1,500 V, is ideal for megawatt charging applications and is currently undergoing certification.
The IEM-DCR meters consist of separate display and sensor units, simplifying integration into charging stations.
While the display must be externally visible to the end user, the current sensor can be installed anywhere inside the charging station. The two modules are connected and can be placed up to 15 meters apart.
Alternatively, manufacturers can use the sensor unit as a stand-alone device (DCS) or as the basis for their own metering system.
A further development compared to the first generation of meters is a CAN interface for the transmission of real-time measurement data (current, voltage, temperature and power). This allows charging station operators to monitor their systems internally with high reliability. In addition, the new generation allows bi-directional measurements and the creation of charging transactions in OCMF format.
Three additional meter variants – IEM-DCS-125, IEM-DCS-1000, and IEM-DCS-1500 – consist only of the sensor unit. These are intended for markets where legally compliant energy reading is not required.
They are also suitable for customers developing their own display solutions or needing a precise current/voltage sensor with signed values. These models share the same performance specifications as the IEM-DCR-125, IEM-DCR-1000, and IEM-DCR-1500.
The IEM-DCR-125 and IEM-DCR-1000 have been certified and meet Accuracy Class B (EN 50470) and Class 1 (IEC 62053-41). In addition to the certification under German calibration law, the meters are also certified under the EU Measuring Instruments Directive (MID).
IEM-DCR meters from Isabellenhütte are already being used in early development phases by various charging station manufacturers and in the Buffered HLL model project for e-buses in Bensheim, Hesse.
In this project, the DC meter is integrated into a fast-charging station with an intermediate storage unit and measures all energy quantities in compliance with calibration law. Thanks to the buffer storage technology, e-buses can be supplied with energy as needed via a pantograph.
