In a first for the EVerest ecosystem, the leading measurement technology company Isabellenhütte has become the first hardware manufacturer to contribute a fully functional, production-ready driver directly to the open source codebase. The result: seamless DC metering integration, open for the entire developer community.

So, why are we so excited about this?

DC metering in EV chargers is not just about measuring power. It is about compliance, real-world performance, and cutting down integration time. Isabellenhütte’s IEM-DCR now enables developers to plug in a certified metering solution – even compliant with German Eichrecht (legal metrology) - without hidden firmware, vendor lock-in, or guesswork.

It is open. It is tested. And it is already running in real-world charging setups.

From Challenge to Code: Building Seamless Integration Together

From day one, the collaboration between Isabellenhütte and the Pionix team pursued a clear objective: simply make the IEM-DCR work inside EVerest. No complications, no friction – the goal was to enable developers to deploy it immediately, eliminating hours spent writing drivers or fine-tuning CAN configurations.

And it paid off. The outcome exceeds expectations: a fully EVerest-compatible meter driver, developed by Isabellenhütte’s engineers and integrated directly into the open source charging software. This comprehensive solution includes extensive test cases, ready-to-use configuration templates, and detailed technical documentation.

This contribution goes beyond technical integration. It sends a signal to the industry: open collaboration works. With this milestone, Isabellenhütte strengthens its position as a forward-thinking partner for charger manufacturers, while the EVerest ecosystem continues to evolve into a powerful foundation for real-wolrd charging innovation.

Technical Integration That “Simply Works”

For developers, the integration comes with many benefits:

• Support of three different power classes (125, 1,000 and 1,500 A with up to 1,500 V) – making platform charging stations simple
• Detached voltage and shunt-based current sensing with compensation of power losses (4-Wire + parametric)
• Parameter change in the field
• Low integration effort and therefore shorter development times
• High performance CAN bus communication with 10 ms sampling rate for real time sensor data at the outlet (I, U, T, P,…)
• High performance bi-directional measurement and compensation
• Class B accuracy for precision measurement across all charging scenarios
• Full certification under German calibration law and European Measuring Instruments Directive (MID)
• Flexible installation options with up to 15 m between sensor and display unit
• Developer-friendly, fully documented, open source

In other words: it is production-ready and it has been validated in real-world setups. The IEM-DCR driver is already fully integrated in the EVCS-Cube DC development kit, delivering a real life proof of how open source and certified hardware can enable rapid deployment without compromise.

Tested and Proven Inside the EVCS-Cube DC

To validate the integration in a production environment, we implemented the IEM-DCR meter into the EVCS-Cube DC – our comprehensive hardware reference platform for DC fast charging. This development kit combines PHYTEC’s sophisticated phyVERSO-EVCS controller with BaseCamp using the Open Source LFE EVerest ecosystem as basis, creating a powerful hands-on development tool for charger manufacturers, system integrators and software teams.

Inside the Cube, the IEM-DCR handles all DC metering tasks with precision, demonstrating that accurate energy measurement, flexible hardware design, and modular open source software can work together seamlessly. This ready-to-use development kit includes all essential HW components such as DC power supply, insulation monitoring, and the IEM-DCR power meter.

For development teams, the impact is immediate:

• Accelerated development: Skip the driver-writing phase and start building
• Standards compliance: Built-in support for CCS (DIN SPEC 70121), ISO 15118-2, and OCPP 2.0.1
• Flexible expansion: Optional modules for WiFi, LTE, display, NFC and more
• Seamless scalability: Move from prototype to production without rework

For manufacturers building their own DC charger, this kind of out-of-the-box integration means they can skip the hardest parts and get straight to product development instead of losing days to debugging CAN messages or rewriting metering code.

A Blueprint for Future Hardware Collaboration

This collaboration is more than just a technical success - it is a blueprint for how hardware manufacturers can directly engage with the open source community. By contributing the driver themselves, Isabellenhütte ensures that the integration is robust, maintainable, and closely aligned with their products’ capabilities and update cycles.

For the EVerest community, this integration represents far more than a successful case. It establishes a powerful blueprint for future collaborations:

• Product-ready solution: A fully certified, standards-compliant metering platform that meets legal requirements in multiple markets
• Zero-friction implementation: Complete with driver code, documentation, and configuration templates ready for immediate deployment‍
• Field-validated reliability: Thoroughly tested in real-world charging scenarios within the EVCS-Cube DC reference platform

“Personally, I’m thrilled when a family business that is over 500 years young, like Isabellenhütte, breaks new ground and we once again demonstrate a start-up mentality. As a hardware manufacturer, it simply made sense for us to build our own driver – we know our product, our innovation cycles, and the best way to extract the data. Thanks to the great support from the Pionix team during testing and integration, we were able to make this contribution with surprisingly little effort.”

– Daniel Müller, Project Manager Isabellenhütte

See it Live at Power2Drive 2025

We will be demonstrating this powerful hardware-software combination with live demos at:

📍 Pionix Booth – B6.279

📍 Isabellenhütte Booth – B6.482

What to expect:

• Live demonstrations of the IEM-DCR integration in the EVCS-Cube DC
• Technical specialists available to discuss your specific implementation requirements
• Early access opportunities for the EVCS-Cube DC development kit

Come by, take a hands-on look inside the Cube, and see how this open source approach can accelerate your charging infrastructure project.

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