comemso Introduces Easy Chester Ultimate: Comprehensive EVSE Testing in One Mobile System

Built for standards. Designed for people.

comemso electronics GmbH introduces Easy Chester Ultimate, a new generation of mobile test systems for EV charging infrastructure. The system combines functional testing of AC, DC CCS, and CHAdeMO charging stations with charging communication analysis and electrical safety testing on both the grid side and the vehicle-facing interface.

Easy Chester Ultimate brings together testing tasks that previously often required several test instruments, different operating concepts, and separate documentation processes.

An integrated 10.1-inch touchscreen guides users systematically through each test. Measurements, communication sequences, and test results are documented in a shared, configurable pdf test report.

Despite its expanded range of functions, Easy Chester Ultimate weighs only 15.7 kilograms, making it significantly lighter than its predecessor. The mobile system was developed for commissioning, maintenance, repair, and periodic inspection directly at the charging station.

“Standards define what charging infrastructure must deliver. Our customers define how testing should feel. Easy Chester Ultimate brings both together. Built for standards. Designed for people,” says Dr.-Ing. Kiriakos Athanasas, CEO of comemso electronics GmbH.

Three Levels of Testing in One System

A charging station may communicate correctly while still presenting an electrical safety issue. It may be installed correctly but still fail to start or stop a charging session reliably. A sound assessment therefore requires functionality, communication, and electrical safety to be examined together.

Depending on its configuration, Easy Chester Ultimate supports:

• Functional testing of AC, DC CCS, and CHAdeMO charging stations
• Testing of Control Pilot and Proximity Pilot
• Testing of PLC communication, including SLAC
• Analysis of digital charging communication according to DIN 70121, ISO 15118-2, and ISO 15118-3
• Simulation of defined faults on CP, PP, and PE lines
• Verification of the charging station’s response to insulation faults
• Electrical safety testing on the grid side and vehicle-facing interface
• Voltage and current measurements

Depending on the test direction and system configuration, electrical safety testing includes protective conductor resistance, insulation resistance, residual voltage, residual current devices, insulation monitoring, and loop impedance.

The system therefore evaluates charging infrastructure from three perspectives: the grid side, the vehicle-facing interface, and the complete charging process.

Guided Testing and Clear Documentation

Easy Chester Ultimate guides users step by step through the selected test process. Status indicators, measurement values, and instructions clearly show which test is active and how its result has been assessed.

The test process follows four structured steps:

1. Connect the system to the charging station (and the grid side).
2. Select the charging standard and test process.
3. Perform safety, functional, and communication tests.
4. Analyze deviations and document the results.

The systematic user guidance supports repeatable testing and makes results easier to interpret. Measurements and test results are automatically transferred into configurable PDF reports. “Passed” or “Failed” assessments refer to the individual test steps that were performed.

Reports can be sent by email directly from the system. Wireless firmware updates, integrated device checks, and optional remote support further simplify field use.

For Commissioning, Service, and Periodic Inspection

Easy Chester Ultimate supports installation, service, and inspection teams throughout the charging station lifecycle. Typical applications include:

• Initial testing and commissioning of new charging points
• Functional checks following maintenance or repair
• Diagnosis of charging and communication problems
• Verification of electrical protection functions
• Periodic inspections
• Testing following firmware or configuration changes

By combining all three testing levels, the system helps users identify whether a deviation originates from the electrical installation, charging communication, protection functions, or general charging behavior.

International Charging Standards and Flexible Extensions

Depending on its configuration, Easy Chester Ultimate supports AC Type 1 and Type 2, CCS Combo 1 and CCS Combo 2, NACS according to SAE J3400, and CHAdeMO.

Supported standards and communication protocols include IEC 61851-1, DIN 70121, ISO 15118-2, and ISO 15118-3. The relevant interfaces are tested directly within the selected system configuration.

Optional extensions are available for additional applications. A Long Duration Unit enables longer charging cycles and the analysis of time-dependent faults. External DC loads allow for testing with higher charging power over a longer period of time.

Ten Years of Easy Chester

The Easy Chester product family has been on the market since 2016. Since then, it has supported manufacturers, operators, installers, testing organizations, and service technicians worldwide in testing and troubleshooting charging infrastructure.

Easy Chester Ultimate represents the next stage in this development. It combines a significantly expanded testing scope with lower weight, systematic user guidance, and integrated documentation.

Product Information

A product video shows Easy Chester Ultimate and its guided testing process in practical use:

https://www.youtube.com/watch?v=mNd1JJHLuNw

Product demonstrations and system configurations are available from comemso.