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Vehicle and charging station
EV TestingVehicle, EVCC and charging-release validation.EVSE TestingCharging-station development through field operation.InteroperabilityReal EV and EVSE in one synchronized test record.
Battery and advanced charging
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.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 MicroAC EVSE installation testerEasy Chester UltimateAC and DC EVSE installation testerEasy Chester CalimeraAC and DC EVSE calibration systemEasy Chester EOL / EOL HPCEVSE end-of-line production tester
Battery, software and EMC
Battery Cell SimulatorBMS testing from compact bench to high-voltage HiL.comframeConfiguration, synchronized analysis and automation.EMC LinkOptical charging communication through the chamber boundary.
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Understand and challenge
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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Capabilities HubConnect the capability model across EV, EVSE and BMS testing.EVCA Capability HubExplore the detailed EV charging capability stack.comframeThe shared test-intelligence environment.Integration & APIsREST, Python, CI/CD and laboratory orchestration.Protocol & Domain ModulesSelect released domain depth.
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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.
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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.Battery Cell SimulationCells, balancing, faults, precision and BMS HiL.
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Resources LibraryCurrent brochures, webinars, guides and checklists.Charger Uptime CalculatorEstimate downtime and field-service impact.EVSE Inspection GuidePractical commissioning and inspection workflow.BMS testing whitepaperTemperature, environment, simulation and test wiring.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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Electric vehicle connected to a comemso EV charging test system while an engineer evaluates the charging session in the laboratory

Applications / EV Testing

EV testing with controlled charging conditions

Validate how an electric vehicle (EV) responds during charging. Use a system that acts as its charging station to set the charging communication and the electrical conditions of the configured test setup. Repeat each charging test and check the vehicle’s response against its requirements.

Open Product Finder Follow the development lifecycle
EVCC developmentTest communication before the complete vehicle exists
Integrated vehicleAlign EVCC, battery management system (BMS), OBC, VCU and the power path
Real-pair evidenceCapture actual EV-to-EVSE behaviour
Release confidenceReuse scenarios across variants and regression
Test scenario: the charging station replies late

Illustrative test: let the simulated charging station delay a supported response. Check whether the vehicle waits, retries or stops as its requirements specify. The EVCC manages the charging conversation, the BMS supplies battery limits, and the OBC converts AC into DC for the battery. Their responses must agree with the measured electrical behaviour.

Decision path

EV charging testing: response to a lower DC current limit

Public chargers and prototype EVSE (electric vehicle supply equipment, or charging station) cannot hold every signal, protocol, power and fault condition constant. A controlled EVSE simulation makes vehicle-side findings reproducible from controller integration to complete-vehicle release.

DC EV test example: vehicle reaction to a lower station current limit

DC vehicle test: condition, expected reaction and evaluation
Test elementDefined condition or observation
DUT and simulated partnerA real vehicle is connected to a controlled EVSE simulation. The selected EVCA system, source and interfaces must support the DC protocol and operating point used.
Changed conditionThe simulated charging station communicates a lower available current during charging. Keep the BMS limits and other controlled conditions constant for the comparison.
Expected EV reactionCheck that the EVCC charging request reflects the changed station limit together with the applicable BMS limits, within the response required for the chosen protocol and test case.
EvaluationCorrelate the announced EVSE limit, EVCC request, available vehicle-network signals and measured electrical response in comframe. Record the defined acceptance criteria, timing and observed result.

This is a test objective, not a reported measurement result. Physical current-response testing requires the configured power path and released measurement functions. An EVCC communication bench checks messages and states; it does not establish the complete vehicle’s electrical response.

EVCC–BMS integration testing · EVCA Flex · Analysis layers and released scope

  1. 01
    Customer situation

    EVCC, BMS (battery management system), OBC and vehicle functions must agree during EV charging.

  2. 02
    Usual alternative

    Drive to changing infrastructure and infer the cause from one charging pair.

  3. 03
    Missing evidence

    Controlled boundary states, synchronised layers and repeatable regression.

  4. 04
    Controlled method

    Simulate the EVSE, define the power boundary and capture vehicle reactions in one timeline.

Matched systemsEVCA Flex · EVCA Multi Mobile · comframe
Published proofEVCA experience from complete-vehicle and charging laboratories.

Application first

EV test scope: EVCC, integrated charging system or complete vehicle

Decide whether to test the charging controller, vehicle subsystem or complete vehicle according to integration maturity and the decision you need to verify.

1

EVCC and communication

Develop the charging controller and protocol stack on the bench. Verify message content, timing, certificates, low-level states and state-machine behaviour without waiting for the complete vehicle.

Typical path: EVCA ComOnly and comframe
2

EVCC, BMS and OBC integration

Check that charging negotiation, battery permission, onboard conversion, vehicle states, contactors and the high-voltage path produce one consistent vehicle response.

Typical path: EVCA Flex, Battery Cell Simulator (BCS) and comframe
3

Complete vehicle and high power

Validate the real vehicle under controlled AC, DC CCS, CHAdeMO, GB/T DC or MCS conditions. Correlate protocol, signals, voltage, current, safety and thermal reactions.

Typical path: EVCA Flex, Multi Mobile or MCS
EV versus EVSE testingEV testing keeps the vehicle-side DUT real and simulates the charging station. EVSE testing keeps the charging-station DUT real and simulates the vehicle.
EV test setup: DC power supply, Connector Box and EV Charging Analyzer connected to the vehicle.
Example DC EV test setup. A controlled charging-station simulation lets you reproduce conditions at the vehicle’s charging interface.Open full-size diagram

One vehicle. Different test objectives at every stage.

EV charging requirements from controller development to vehicle release

As you integrate more of the physical system, keep each original requirement linked to the controlled condition and expected response used to test it.

  1. 1
    Component development

    EVCC, BMS, OBC and charging-related control functions before the complete vehicle is available.

    EVCA ComOnly, BCS, comframe
  2. 2
    EVCC, BMS and OBC integration stage

    Charging requests, battery limits, AC conversion, direct DC charging and vehicle execution on one timeline.

    EVCA Flex, BCS, comframe
  3. 3
    Conformance and robustness

    Standards-based behaviour plus boundaries, missing messages, timing changes and deliberately difficult partner behaviour.

    EVCA and Test Libraries
  4. 4
    Vehicle and high-power validation

    Complete-vehicle testing across communication, low-level signals, physical power, safety, thermal behaviour and EMC.

    EVCA Flex, EVCA MCS, EMC Link
  5. 5
    Interoperability and field validation

    Test the real vehicle with real charging stations and preserve the exact interaction that produced a failure.

    EVCA Interop and Multi Mobile
  6. 6
    Regression, release and production

    Use the validated charging behaviour to build repeatable test campaigns for software releases, vehicle variants and production-related verification.

    comframe, EVCA and BCS

Test depth and standards-aware analysis

Charging-process analysis: EVCC, BMS, OBC, signals and power

Showing decoded data is not the same as analysing the charging process. comframe can correlate protocol, low-level states, vehicle-network information and electrical behaviour. Automated Standards Analysis and Cross-Layer State Monitoring add expected context where released.

Measured charging data evaluated automatically against normative expectations View the analysis diagram at full size
Automation and regression

Saved configurations, unattended campaigns, reports and variant evidence.

EVCC, BMS and OBC coordination

Requests, limits, state of charge, thermal constraints and fault reactions.

Protocol and state machine

Expected, optional, delayed, missing and unexpected messages.

High-level communication

DIN 70121, ISO 15118, certificates, TLS and timing.

Low-level signals

Control Pilot (CP), Proximity Pilot (PP) and technology-specific connection and control states.

Power and safety

Voltage, current, energy transfer, contactors, isolation and controlled faults.

Cross-Layer State Monitoring is available for applicable DC CCS, CHAdeMO and DC China / GB/T DC configurations. Exact protocol versions, channels and released functions remain product-specific.

EVCA Interop and Charge Playback

Turn real charging-station behaviour into a controlled EV test.

A vehicle must work with charging-station implementations that cannot all remain in the laboratory. EVCA Interop captures the real EV-to-EVSE interaction. Charge Playback then converts supported EVSE-side PLC (power line communication) content and timing into an active physical charging partner for the EV under test.

  1. Real charging session

    A real EV and EVSE interact under the field or interoperability condition that matters.

  2. Record

    Capture the EVSE-side PLC content, timing and related charging measurements from the real session.

  3. Extract

    Extract the behaviour needed for a supported EVSE simulation configuration and preserve its origin.

  4. Active simulation

    Present the recorded charging-station behaviour actively to the EV through the physical charging interface.

  5. Repeat and modify

    Repeat the vehicle test and vary one charging-partner condition at a time. Use the recorded vehicle response to define automated regression cases.

Replay reproduces data for the engineer.
Charge Playback reproduces charging behaviour for the device under test.

Investigate the real pair

For a real vehicle connected to a real charging station, EVCA Interop provides focused access and synchronised evidence. Choose EVCA Multi Mobile when vehicle testing also needs broader portable measurement and charging-partner simulation within the selected configuration.

Explore EVCA Interop

Reproduce the charging station

Use released Charge Playback functions to repeat recorded charging-station behaviour at the vehicle’s physical charging interface.

Explore Charge Playback
Continue from evidence to reproductionUse Interoperability and Charging Analysis to investigate the real pair, then confirm the supported EVCA Interop and Charge Playback scope for laboratory reproduction.
Open Interoperability and Charging Analysis

Global charging technologies

EV charging interfaces: AC, DC CCS / NACS, CHAdeMO, GB/T and MCS

The application method remains consistent, but standards, communication, low-level signals, power hardware and released software functions differ by charging technology.

AC

AC charging

IEC 61851-1, SAE J1772 and ISO 15118 where applicable. Test EVCC and OBC interaction with the charging-station side.

CCS / NACS

DC CCS and NACS

DIN 70121, ISO 15118-2, ISO 15118-3 and ISO 15118-20 according to the configured system and release.

CHAdeMO

CHAdeMO

CAN-based charging communication, low-level states and functional workflows for supported versions.

GB/T

DC China / GB/T

GB/T 18487.1 and GB/T 27930 variants with technology-specific communication and state evaluation.

MCS

Megawatt Charging

10BASE-T1S, ISO 15118-20, CE and ID, thermal interfaces, safety and high-power validation in the dedicated MCS path.

Product pages, datasheets and Standards & Knowledge define the exact standard editions, Test Libraries, interfaces and released function scope.

From objective to implementation

EV test equipment for communication, integration and complete vehicles

Communication first
EVCA ComOnly

EVCC and protocol development without full-power laboratory equipment.

 Integrated laboratory
EVCA Flex

Communication, low-level signals, external power, faults and automation.

 Vehicle and field
EVCA Multi Mobile

Portable simulation, measurement and multi-standard field workflows.

 Megawatt Charging
EVCA MCS

Dedicated MCS communication, signals, cooling and high-power architecture.
Battery states
Battery Cell Simulator

Virtual cells, sensors, balancing, isolation and fault conditions for BMS integration.

EMC environment
EMC Link

Optically isolated charging communication across the chamber boundary.

 Software and evidence
comframe

Configuration, synchronised analysis, automation, reporting and integration.
Formal verification
Conformance Test Libraries

Defined test cases, standard editions, DUT roles, verdicts and evidence.

Customer references

Vehicle-side charging validation in practice.

The following customer experiences relate to testing with our EVCA systems.

Digital laboratory

Customer outcomeThe team describes EVCA as its most complete vehicle simulation, sniffer and man-in-the-middle system.

Montagna GiampieroHead of Digital Lab · KEMA Labs

What does EVCC mean in an EV charging test?

Here, EVCC means Electric Vehicle Communication Controller: the vehicle-side charging controller that communicates with the charging station’s SECC (Supply Equipment Communication Controller). It is distinct from the separate energy-management application named evcc.

The selected boundary determines EVCA configuration, counterparts, protocol editions and signal coverage.

Explore EVCC–BMS integration testingOpen Product Finder

Frequently asked questions

EV testing

What is EV testing?

EV testing verifies how an electric vehicle, EV communication controller or charging-related vehicle subsystem behaves with a controlled simulated charging station. The vehicle side is the device under test.

What is the difference between EV testing and EVSE testing?

During EV testing, the vehicle or EVCC is the device under test and the test system simulates a charging station. During EVSE testing, the charging station is the device under test and the system simulates the vehicle.

Can an EVCC be tested before the complete vehicle exists?

Yes. A communication-focused EVSE simulator can operate an EVCC on the bench, provide the relevant charging interfaces and expose message content, timing, certificates and state transitions before full vehicle integration.

Why test EVCC, BMS and OBC together?

The EVCC negotiates charging, the BMS defines battery limits and the OBC executes AC energy conversion. Joint testing reveals inconsistent limits, states, timing and physical reactions that isolated ECU tests cannot expose.

How is direct DC charging different from AC OBC testing?

During AC charging, the onboard charger is part of the vehicle power path. During DC CCS, CHAdeMO and GB/T DC charging, the OBC is bypassed and the external charger supplies the high-voltage battery path through the vehicle inlet and contactors.

How does EVCA Interop support EV testing?

EVCA Interop captures the real interaction between a vehicle and charging station on one synchronised time base. The resulting evidence can isolate a field problem and support controlled validation or laboratory reproduction.

What is an EVCC, and what should an EVCC test verify?

The EVCC is the vehicle-side controller for charging communication with the charging station. EVCC testing checks relevant messages, state transitions and timing against a controlled station counterpart.

Integration tests also correlate its requests with BMS limits, contactor and precharge states, and the measured electrical response. AC tests include the OBC power path; direct DC charging bypasses the OBC in the energy path. The required test interfaces and functions depend on the charging technology and configured system.

Explore EVCC, BMS and OBC integration testing · Review controller communication testing

Vehicle-side test planning

Plan vehicle charging validation.

Define the vehicle or controller under test, the charging-station behaviour to simulate, operating points and acceptance criteria. Select the EVCA configuration after the test method is clear.

Open Product FinderContact application engineering

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