What is mobile EV charge point calibration?

Mobile EV charge point calibration is the process of verifying that AC and DC charging stations measure and bill energy accurately, carried out on-site at the charge point rather than in a fixed laboratory. It uses specialist equipment integrated into a service vehicle to deliver traceable, field-ready measurements.

Why does EV charge point calibration matter?

Calibration ensures that EV drivers are billed for exactly the energy they receive. As public and commercial charging networks expand, accurate measurement, regulatory compliance, and consumer trust all depend on charge points being independently verified against traceable standards.

What is the comemso Easy Chester Calimera?

The Easy Chester Calimera is a mobile in-field calibration system developed by comemso electronics GmbH for AC and DC EV charging stations. It supports calibration-compliant testing processes in accordance with ISO/IEC 17025 and is compatible with CCS1, CCS2, CHAdeMO, NACS, and AC Type 1 and Type 2 charging standards.

Who is the Czech Metrology Institute?

The Czech Metrology Institute (CMI) is the national metrology institute of the Czech Republic, established by the Czech Ministry of Industry and Trade. It is responsible for ensuring measurement accuracy and uniformity across scientific, technical, and economic sectors, including EV charging infrastructure.

How is the Easy Chester Calimera deployed in the field?

The Easy Chester Calimera integrates into a standard service vehicle, allowing calibration teams to verify AC and DC charge points on-site. CMI's system was professionally integrated into its own service vehicle by comemso and has been in active field use since February 2026.

Which charging standards does the Easy Chester Calimera support?

The Easy Chester Calimera supports CCS1, CCS2, CHAdeMO, NACS, AC Type 1, and AC Type 2 charging standards, covering the full range of common AC and DC EV charging protocols in use across public and commercial charging networks.

What standard governs EV charge point calibration?

EV charge point calibration processes are governed by ISO/IEC 17025, the international standard for testing and calibration laboratories. The Easy Chester Calimera supports calibration-compliant testing in accordance with this standard and is suitable for legal metrology applications.

How does field calibration differ from laboratory calibration for EV charging stations?

Laboratory calibration requires charge point equipment to be transported to a fixed facility, which is impractical at scale. Field calibration uses mobile systems such as the Easy Chester Calimera to verify stations in situ, reducing logistical overhead and enabling compliance programmes to scale with network growth.

What role do national metrology institutes play in EV charging infrastructure compliance?

National metrology institutes establish and maintain the measurement standards underpinning regulatory compliance for EV charging infrastructure. By deploying mobile calibration tools, institutes such as CMI can verify that charge points meet legal metrology requirements directly in the field, supporting billing accuracy and regulatory traceability at scale.

What automated capabilities does the Easy Chester Calimera provide for testing organisations?

The Easy Chester Calimera includes automated testing workflows designed for high-power AC and DC charging applications. These reduce manual intervention during calibration procedures and support consistent, repeatable measurements across distributed charging networks, meeting the operational requirements of testing organisations and regulatory authorities working at scale.

Czech Metrology Institute brings mobile EV charge point calibration to the field

Category: Charging Networks, Infrastructure & Charging, Policy & Market, Testing & Validation

June 8, 2026

comemso Easy Chester Calimera mobile EV charge point calibration system installed in service vehicle, showing integrated AC and DC calibration equipment

The Easy Chester Calimera integrates directly into a service vehicle, taking AC and DC charge point calibration out of the laboratory and into the field

(Image courtesy of comemso electronics GmbH)

The Czech Metrology Institute (CMI), the national metrology institute of the Czech Republic, has deployed comemso‘s Easy Chester Calimera mobile calibration system, bringing traceable, field-ready verification of AC and DC charging infrastructure directly to the charge point. According to comemso’s June 2026 release, the system has already been integrated into CMI’s service vehicle and is in active use.

CMI’s investment supports accurate billing and regulatory confidence as public charging infrastructure expands. For end users, the principle is straightforward: they should be billed for exactly the energy they receive. That depends on verified, calibrated charge points.

Mobile calibration brings high-power charging verification on-site

The Easy Chester Calimera is a mobile in-field calibration system designed for real-world deployment on AC and DC charging stations. It supports common charging standards including CCS1, CCS2, CHAdeMO, NACS, and AC Type 1 and Type 2, and supports calibration-compliant testing processes in accordance with ISO/IEC 17025. Automated workflows and support for high-power charging applications make it suited to modern public and commercial charging sites.

The system integrates into a service vehicle, allowing calibration teams to verify charge points where the energy actually flows rather than transporting equipment to a fixed laboratory. For charge point operators and testing authorities, that field capability extends the reach of compliance programmes across growing charging networks.

Charging infrastructure compliance deployment completed in two months

The CMI project moved from demonstration to operational deployment in approximately two months. comemso’s team visited Prague in December 2025 to demonstrate the Calimera using a demo vehicle, with CMI colleagues and international partners present. CMI then supplied its own service vehicle, which comemso professionally integrated with the Calimera system.

Handover took place in February 2026, with joint system training completed on the same day before CMI drove the vehicle back to Prague. The system has been in active use since.

“This project clearly demonstrates the importance of practical and mobile calibration solutions for the further development of charging infrastructure,” said Anita Athanasas, Chief Commercial Officer at comemso.

Metrological standards follow charging infrastructure growth

CMI’s deployment is one example of how national metrology institutes are actively shaping the quality and transparency of e-mobility infrastructure. As public and commercial charging networks continue to expand, measurement accuracy, traceability, and regulatory confidence are becoming increasingly important — a pattern comemso sees the CMI project as reflecting.

The deployment points to a broader industry direction: mobile verification tools supporting the operational demands of expanding charging networks, taking compliance work out of the laboratory and into the field.

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