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BMS TestingCells, sensors, balancing and controlled faults.BMS + EVCC + OBCValidate the interaction of battery, charging controller and on-board charger.MCS TestingCommunication, signals, cooling and megawatt power.EV Charging EMCKeep charging communication observable under EMC stress.
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EVSE End-of-LineRepeatable acceptance and unit-level results.Commissioning & Field ServiceCommission, diagnose and verify installed chargers with an EV charger tester.Calibration & MetrologyTraceable energy verification at the charging point.
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EVCA
EVCA PlatformCommunication, interoperability, high-power, MCS and EMC paths.EVCA ComOnlyFocused charging communication testing.EVCA Multi MobilePortable laboratory and field analysis.EVCA InteropAnalyse interoperability between a real EV and EVSE.EVCA FlexModular high-power testing and controlled faults.EVCA MCSMegawatt charging communication, low-level signals and system testing.
Easy Chester
Easy Chester PlatformEVSE production, commissioning, service and calibration.Easy Chester MicroWallbox tester for AC chargersEasy Chester UltimateDC fast charger tester (AC/DC)Easy Chester CalimeraAC and DC EVSE calibration systemEasy Chester EOL / EOL HPCEVSE end-of-line production tester
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Battery Cell SimulatorBMS testing from compact bench to high-voltage HiL.SmartCal calibration (accessory)Automated calibration and adjustment of the Battery Cell Simulator.comframeConfiguration, synchronized analysis and automation.EMC LinkOptical charging communication through the chamber boundary.
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comframe and integration
comframeThe test software for every comemso system.Integration & APIsREST, Python, CI/CD and laboratory orchestration.Protocol & Domain ModulesSelect released domain depth.Capabilities HubConnect the capability model across EV, EVSE and BMS testing.EVCA Capability HubExplore the detailed EV charging capability stack.
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Automated Standards AnalysisMeasured behaviour, normative context and highlighted deviations.Professional SimulationConfigure nominal, boundary and non-conform behaviour.Manipulating GatewayTest a live correction hypothesis between real partners.
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Charge PlaybackReproduce the charging partner for the DUT.Charge Cycle AutomationTurn saved configurations into repeatable campaigns.Conformance Test LibrariesVersioned executable standards-based test logic.
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Start with the decisionStandards & Knowledge
Standards and test logic
Charging, Safety & EMCCharging behaviour, field safety, editions and test boundaries.Conformance Test LibrariesReleased executable test logic, verdicts and evidence.AFIR for EV ChargingRegulation, responsibility and verifiable evidence.NACS (SAE J3400)Charging communication tests for the North American Charging Standard.UL standards & EVSE field safetyUL requirements and electrical safety checks at installed charge points.
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Knowledge CenterTechnical explanations, methods and application guidance.GlossaryStable charging and BMS test terminology.EVSE Calibration MethodsCompare controlled real load and reference measurement.Testing a wallboxProcedure, standards, limits and test report for electricians.ISO 15118 explainedParts, -2 vs -20, Plug & Charge and AFIR dates.Battery Cell SimulationCells, balancing, faults, precision and BMS HiL.
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Resources LibraryCurrent brochures, webinars, guides and checklists.BMS testing whitepaperTemperature, environment, simulation and test wiring.EVSE Inspection GuidePractical commissioning and inspection workflow.Charger Uptime CalculatorEstimate downtime and field-service impact.Technical newsletterChoose product updates and events relevant to your tests.
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About comemsoEngineering purpose, history and operating companies.Development & manufacturingShort paths from development to system testingQuality & CertificationsManagement systems, validation and calibration evidence.Customer ProofNamed stories, endorsements and published configurations.SustainabilityEnvironmental management and measured progress.
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Customer Care TeamDelivery, commissioning, training and support.Sales PartnersRegional commercial and service access.CareersWork on deep e-mobility testing.
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News & EventsProjects, releases, webinars and company updates.Request a technical demoDiscuss your test task with the comemso team.ContactSales, support and locations in one place.

High-power EV and EVSE tester

Test vehicles and chargers under real power in your own lab.

EVCA Flex simulates the charging station or the vehicle. It combines communication, signals, external power equipment and fault modules in one laboratory setup – instead of separate sources, loads and analysers.1

Up to 1,500 V and 500 A as standard – 600 A or 800 A on request.

Request a 15-minute demo Find your test system
EVCA Flex test rack with charging interfaces and cables
EV and EVSE testingSimulates the counterpart your DUT needs
Scalable power pathIntegrates source, load or bidirectional equipment
Controlled fault depthChallenge protocol, signals, switching and electrical paths
Standards-based resultsMeasurements and evaluation correlated for the agreed test configuration
In 30 seconds
What for
Laboratories that test vehicles or chargers under real power.
What it does
Up to 1,500 V and 500 A as standard, 600 A or 800 A on request. EV or EVSE simulation, external power equipment and fault modules in one setup.
Not for
Installation checks in the field – that is Easy Chester; megawatt truck charging – that is EVCA MCS.

A high-power charging fault that first shows up at a customer's site means damaged hardware and lost trust.

EVCA Flex at a glance

Published Flex voltage, current and fault configurations

Separate operating ratings from the short-circuit configuration
ParameterPublished scopeConfiguration condition
CCS / NACS voltageUp to 1,500 V.The selected interface and complete system define the final voltage range.
Charging currentUp to 500 A standard; 600 A or 800 A on customer request.Customization, voltage, duration and cooling must be specified together.
Short-circuit configurationUp to 1,000 V / 500 A.Only the approved fault topology, hardware, energy limits and operating conditions apply.
Actual operating pointExternal source, load or bidirectional power system.Power, continuous and peak duration, cooling, switching energy and facility limits are confirmed for your project. The listed maxima do not establish a continuous power rating.

IEC TestLib software status

Your Flex configuration

The standard sets the test requirements; we agree hardware, software release and test cases for the delivered system on that basis.

Text updated:

Discuss your Flex configuration

One platform tests both sides of the charging interface.

EV testing with EVSE simulation; EVSE testing with EV simulation

Complete electric vehicle connected to EVCA Flex for laboratory EV testing
EV testing

The vehicle, tested against EVSE simulation

EVSE (charging station) communication, low-level states and the selected source work together. EVCC (vehicle-side charging communication controller), charging inlet, onboard systems and the complete vehicle are tested under controlled conditions.

  • AC and DC EVSE simulation
  • Source and grid-emulator integration
  • EVCC, battery management system (BMS), OBC and vehicle-state correlation
  • Conformance, robustness and regression campaigns
DC charging station connected to an EVCA Flex laboratory setup for EVSE testing
EVSE testing

The station, tested against EV and battery simulation

EV communication and battery requests drive the selected load or bidirectional supply and the released fault modules for charger development and verification.

  • Configurable EV and battery behaviour
  • Load or battery-emulator integration
  • Output control, protection and shutdown reaction
  • IEC 61851-23 and project-specific electrical testing

Modular system architecture

Flex test architecture: simulation, charging interface, power and analysis

Replace or expand rack and cassette hardware without returning the complete test environment when connectors, standards, voltage classes or test objectives change.

EVCA Flex system architecture: DUT, charging interface, signals, optional fault modules, external power and comframe
A configurable stack around the charging interface.
1. Charging counterpartEV or EVSE simulation

You choose protocol, low-level states, connector and operating behaviour for the DUT.

2. Physical interfaceCharging connectors and measurement

Connector, voltage class, current path and measurement channels follow the project.

3. Power and faultsExternal source, load and optional switching

Power equipment and fault hardware integrate without changing the charging-specific software workflow.

4. comframe analysiscomframe, Test Libraries and automation

comframe configures the test, analyses the charging event and automates supported sequences. comframe keeps complete session records for review.

EVCA Flex with the IEC 61851-23 rack

Provoke the electrical fault. Measure how the EVSE responds.

EVCA Flex with dedicated IEC 61851-23 switching and fault hardware addresses the full Annex CC.7.5 test scope in the matching system configuration. comemso demonstrated these test cases on a customer’s charging station in its own laboratory.

DC short-circuit test objective: record the charging station’s protection response
Configured electrical test: setup, fault condition and evaluation
Test elementConfiguration and observation
Real DUT and setupA DC charging station is the DUT. EVCA Flex simulates the vehicle; the selected external load or bidirectional system covers the planned charging condition.
Configured faultUse the approved short-circuit hardware path and test sequence for the selected operating point. Confirm voltage, current, fault energy, protection and switching scope before the test.
Observed response and verdictRecord the fault trigger, charging communication, voltage and current waveforms, and the EVSE protection or shutdown response. Compare the captured response with the acceptance criteria of the applicable test case.
Measurement and softwareSpecify oscilloscope channels, probes, bandwidth and trigger with the TestLib. The existing IEC 61851-23 demonstration used CANoe; its comframe port is not yet released. comframe remains available for the separately released simulation and analysis functions.

Illustrative test objective for planning your configuration. We define the electrical fault path, measurement equipment and operating conditions for the approved setup.

Short-circuit configuration · Current IEC TestLib workflow · Synchronised test-action and response analysis

EVCA Flex rack for charging simulation, communication, measurement and external power integration
Core laboratory rackEVCA Flex

Charging simulation, interfaces, synchronised measurement, power coordination and comframe.

Dedicated IEC 61851-23 rack for selected electrical EVSE verification tests
Electrical verification extensionIEC 61851-23 rack

Dedicated switching and fault paths for the selected released test scope.

The IEC rack extends EVCA Flex. It does not replace it. The final system definition identifies the Test Library version, required electrical paths, external load, oscilloscope, protection concept and responsibility for the complete test setup.

Test setup and responsibilities

Plan the hardware and measurement path for IEC 61851-23
Test functionPrimary system elementProject definition
EV simulation and charging communicationEVCA Flex and comframeCharging family, protocol edition, certificates, messages and low-level behaviour
Voltage, current and power coordinationEVCA Flex with external source, load or bidirectional systemOperating quadrant, dynamics, maximum and continuous envelope, cooling and facility limits
Selected IEC 61851-23 electrical pathsIEC 61851-23 rack where requiredReleased switching and fault modules mapped to the applicable test cases
Waveform acquisitionExternal oscilloscope and measurement equipmentChannels, probes, bandwidth, trigger conditions, isolation and data handover
Test sequence and verdictIEC 61851-23 TestLib; CANoe in the demonstrationStandard edition, annex, Test Library release, project parameters and report requirements
Power absorptionExternal load or bidirectional power systemThe load must cover the charger power required by the planned test condition
Current IEC TestLib workflow The demonstration used comemso’s own IEC 61851-23 TestLib in CANoe. ISO 15118-4/-5 SECC tests are already released in comframe.View the released comframe workflow
Test your charging station in the laboratory

Agree fault cases, voltage, current, power, switching and protection, source or load, measurement channels and TestLib version. Then assess your EVSE in the demonstrated laboratory setup.

Discuss the test scope and demonstration

Synchronised records of communication and electrical behaviour

Fault-response analysis: trigger, communication and electrical measurements

EVCA Flex and comframe put communication signals, electrical measurements, fault commands and DUT responses on a common time base. The test compares the response with the test requirement, and controlled tests confirm the suspected cause.

  • High-level communicationMessages, sequence, timing, TLS and certificate context.
  • Low-level interfaceCharging states, connection conditions and released signal measurements.
  • Power behaviourRequested and measured voltage, current, source or load response and shutdown.
  • Test actionFault trigger, switching command, test step, expected condition and actual reaction.
Analysis
Automated Standards Analysis

comframe relates measurements and protocol events to expected limits and highlights deviations automatically.

Simulation
Professional Simulation

Supported message content, timing and deliberately nonconforming partner behaviour are configurable.

Conformance
Conformance Test Libraries

Versioned procedures run with automated steps, verdicts and reports according to the scope.

Regression
Charge Cycle Automation

Saved charging cycles, variants, endurance sequences and unattended campaigns run automatically.

 Field to lab
Charge Playback

The system reproduces supported field behaviour actively at the physical charging interface.
Integration
APIs and laboratory orchestration

Supported source, load, HiL and automation systems work together while the charging-domain workflow stays the same.

Charging standards and product selection

AC and DC charging tests with EVCA Flex. Dedicated MCS testing with EVCA MCS.

CCS and NACS

AC and DC charging

IEC 61851-1, IEC 61851-23, DIN 70121, ISO 15118 including applicable ISO 15118-20 scope, SAE J1772 and selected NACS interfaces.

CHAdeMO

CAN-based DC charging

EV and EVSE simulation, communication analysis, measurement and Test Libraries according to the supported release.

GB/T

Chinese DC charging

GB/T 18487.1 and GB/T 27930 variants according to the selected product and project configuration.

Dedicated product path

Megawatt Charging System

EVCA MCS covers 10BASE-T1S, MCS low-level states, cooled interfaces and megawatt power integration in its dedicated MCS test architecture.

View EVCA MCS

Application first

When does an end-of-line test need EVCA Flex?

Easy Chester covers repeatable production acceptance. EVCA Flex fits when your acceptance plan calls for laboratory power integration, advanced electrical conditions or controlled fault tests.

Open EVSE End-of-Line Testing

The delivered system, planned with you

Flex configuration: device under test, interfaces, external power and test scope

Work with the application engineers to define Flex, IEC-rack, external-power and software scope. Agree supplied and external equipment, safety responsibilities and the integration tasks of each party.

Device under test and direction

EV, EVCC, complete vehicle, EVSE, SECC (station-side charging communication controller), power module or charging subsystem.

Charging technologies and connectors

AC, CCS, NACS, CHAdeMO or GB/T, including regional connector and protocol variants.

Power and facility requirements

Voltage, current, operating quadrant, continuous and peak power, dynamics, cooling and facility constraints.

Fault and IEC 61851-23 scope

Protocol, signals, switching, short circuit, standard edition, annex, Test Library and required IEC-rack paths.

Measurement and results

Voltage, current, oscilloscope channels, trigger, time base, reports and data handover.

Automation and upgrade path

comframe licences, APIs, external systems, campaign throughput, training, maintenance and future expansion.

Trusted charging tester for EVSE manufacturers, OEMs and certification labs
  • ABB
  • Alpitronic
  • ChargePoint
  • Ionity
  • EnBW
  • BMW
  • Mercedes-Benz
  • Volvo
  • Honda
  • VDE
  • TÜV Austria
  • UL Solutions
Customer experience

“Currently the best and most complete vehicle simulator / sniffer / man in the middle we have used.”

Montagna GiampieroHead of Digital Lab, KEMA Labs

Frequently asked questions

EVCA Flex and IEC 61851-23 FAQ

What is EVCA Flex?

EVCA Flex is a modular high-power laboratory system in the comemso EV Charging Analyzer/Simulator platform. It combines charging communication, low-level signals, measurement, external power integration, configured fault functions and comframe for EV and EVSE development.

Can EVCA Flex test both electric vehicles and charging stations?

Yes. For EV testing, it represents the charging-station side and coordinates the selected source and interface. For EVSE testing, it represents the vehicle and battery side and coordinates the selected load or bidirectional system.

Is the IEC 61851-23 rack included in every EVCA Flex system?

No. The IEC rack is an additional hardware path for selected electrical verification tests. A communication, development or general high-power Flex configuration does not automatically include it. The project scope must define the applicable test cases, switching paths and external measurement equipment.

Which IEC 61851-23 annexes are relevant?

IEC 61851-23:2023 has one annex per system: AA for System A (CHAdeMO), BB for System B (GB/T DC) and CC for System C (DC CCS). Further general annexes complete it. The delivered system and Test Library must state which annex and test cases are released. The current combined Flex and IEC-rack project path is positioned primarily around DC CCS Annex CC verification.

More on this topic

Practical examples and further reading

Customer projects, success stories and technical articles related to this page.

EVCA system planning

Define your EVCA Flex laboratory system.

The required source or load, charging interfaces, measurement channels and fault modules come together for the agreed Flex test scope.

Published project examples: July 2025: EVCA Flex in a certification laboratory. The articles document the configuration used in each project at that time.

From the demo to your first test:

  1. 15-minute demo. An engineer shows your vehicle or charger test case on a real EVCA Flex system.
  2. Written quotation. Flex rack, IEC rack, external power, fault modules and software for your task – then you order.
  3. Delivery and start. Commissioning and training are agreed in the quotation.
Find your test systemRequest a 15-minute demo

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EVCA systems by test role

Choose Flex for modular laboratory power and electrical fault tests

Controller development
EVCA ComOnly

Controller communication development, simulation and protocol analysis.
Portable laboratory and field
EVCA Multi Mobile

Mobile simulation, measurement and field-to-lab workflows.

Real EV and real EVSE
EVCA Interop

For the charging interaction between a real vehicle and station: EVCA Interop.

Modular high-power laboratory

EVCA Flex

Modular power integration and electrical fault testing.

Dedicated megawatt architecture
EVCA MCS

10BASE-T1S, MCS signaling, cooled interfaces and megawatt power.
Compare the EVCA Platform EV Testing EVSE Testing Standards & Knowledge
¹ Scope

Functions, charging standards, interfaces, power ratings and Test Libraries depend on the EVCA system, the software release and your project configuration. Automated standards analysis supports, but does not replace, formal conformance testing. The quotation confirms the scope for your project.

    • Confirm the supported CHAdeMO release and hardware configuration.
      • Define continuous and peak operating points for the complete system.
        • Specify connector hardware, protocol releases, TLS and certificates, power class, fault modules and Test Libraries independently in the quotation.
        • Confirm the applicable edition, system, Test Library and released hardware; annex coverage is configuration-specific.
        • Independent validation and Test Library scope. comemso is listed by CharIN for defined DC EVSE application profiles. This does not mean that every EVCA Flex configuration contains every test case or every optional capability.