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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
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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 Charging Testing for Vehicle Validation

Test the electric vehicle (EV) with a system that acts as its charging station. Set the charging conversation and electrical conditions, then check whether the vehicle responds as expected.

Find the right EV test system Follow the development lifecycle
EVCC developmentTest communication before the complete vehicle exists
Integrated vehicleAlign EVCC, 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

Keep the real vehicle as DUT. Make the EV charging counterpart repeatable.

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.

  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, including umlaut’s EFECT laboratory.

Application first

Start with the vehicle boundary, not a list of instruments.

During EV testing, the vehicle, EVCC or charging-related vehicle subsystem is the device under test. The controlled test partner represents the charging-station side and creates repeatable communication, signal, timing and power conditions. The appropriate boundary depends on what already exists and which decision must be proven.

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

Test whether charging negotiation, battery permission, onboard conversion, vehicle states, contactors and the high-voltage path describe one consistent vehicle decision.

Typical path: EVCA Flex, 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.

Carry the same charging requirements from the first controller to the released vehicle.

Test depth changes as integration grows. The lifecycle keeps the original requirement, controlled condition and expected response connected while the physical system becomes more complete.

  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

    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

    Turn validated charging behaviour into repeatable campaigns for software releases, vehicle variants and production-related verification.

    comframe, EVCA and BCS

Test depth and standards-aware analysis

Test every layer. Let the software show where the layers stopped agreeing.

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 Charge Playback where released to present recorded EVSE-side behaviour at the physical charging interface and repeat the case against the EV.

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

Select the technology, interface and released test depth explicitly.

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

Choose the EV test path by the DUT and required depth.

Compare the available systems by test boundary, power, fault depth and released standards scope. Specialist applications provide the deeper method where required.

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
Charging laboratory

Customer outcomeA long-running collaboration continues with another comemso hardware upgrade for the EFECT laboratory.

Christian NeidelEFECT charging laboratory · umlaut, part of Accenture

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.

Define whether you are testing controller communication, the electrical charging interface or the complete vehicle. EVCA configuration, counterparts, protocol editions and signal coverage follow that boundary.

Explore EVCC–BMS integration testingDescribe your EVCC test scope

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

Define the charging behaviour your vehicle must prove.

Specify the real vehicle-side DUT, simulated charging-station role, interfaces and required evidence.

Configure your test systemContact application engineering

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