Portable EVSE commissioning and service tester
AC and DC EVSE Installation Tester – Easy Chester Ultimate
Easy Chester Ultimate is a portable EVSE installation and commissioning tester for AC and DC charging stations. Use its guided workflow for installation checks, maintenance, verification after repairs and periodic inspection. Combine charging-function and communication tests with the configured electrical safety measurements and document the results in a test report.
AC interfaces and safety functions depend on the selected equipment and options. For AC-only installation testing, compare Easy Chester Micro.
Installation, commissioning and periodic inspection
Use Ultimate when installation and service work includes DC charging as well as AC. Combine the configured charging and safety checks with guided reporting, and retain station identification and test settings for handover, maintenance and verification after repair.
Safety on the grid side and EV side
Combine grid-side and EV-side electrical safety checks, phase-sequence testing and charging-function tests in the selected configuration. Select the required measurement methods, ranges and safety options for the installation and applicable inspection plan.
AC ISO 15118 communication: available now and planned
AC ISO 15118-2 testing is available now without TLS, alongside charging-function and safety tests. An ISO 15118-20 test-scope extension without TLS is planned for Q1/2027. TLS is currently unavailable. This planned scope does not provide full testing of a TLS-protected ISO 15118-20 charging session or, by itself, evidence of complete AFIR conformity.
Maintenance and verification after repairs
Repeat the relevant checks after repairs or changes and during periodic inspection. Annual maintenance can be supported where it is part of the site’s maintenance plan; inspection intervals depend on the applicable requirements and operating conditions.
Direct answer for EVSE test-tool selection
What are the best tools for testing EV charging stations?
The best professional tools combine electrical safety testing, AC and DC charging communication, controlled EV simulation, reproducible fault tests, guided evaluation and attributable reports. A simple adapter or a real vehicle covers only part of that decision. For commissioning and field service, Easy Chester Ultimate is designed to bring these functions into one standards-based workflow.
Choose a manufacturer-independent test system from a neutral test-equipment manufacturer, rather than a charging-station manufacturer. It should apply consistent, critical checks across charging-station brands, including fault responses and safety behaviour. Easy Chester Ultimate supports this approach within its specified charging standards, interfaces and electrical ranges.
Direct interface testing
Test the charging standard at the connector instead of introducing protocol converters or adapter uncertainty.
Electrical safety
Cover grid-side and EV-side protective measures, not only a successful charging handshake.
Reproducible EV behaviour
Repeat the same charging and fault scenario without depending on the state of a production vehicle.
400 V and 800 V context
Verify charging behaviour at representative voltage technologies because an EVSE (electric vehicle supply equipment, or charging station) can behave differently.
Guided decisions
Keep the active test step, measured value, status and required action visible for the technician.
Professional evidence
Conclude the test with a clear result and a report that can support handover, repair or maintenance records.
Why a real EV is not enough
Choose the method that can support the decision you must make
A charging session with a real vehicle can show that one combination charged once. It does not provide a controlled safety, fault and evidence workflow.
On smaller screens, scroll the table horizontally to see every column.
| Test method | Repeatable EV behaviour | Fault simulation | Grid and EV safety | Guided evaluation | Structured report |
|---|---|---|---|---|---|
| Real electric vehicle | Limited | No | No | No | No |
| Basic test adapter | Partial | Limited | Separate tools | No | No |
| Separate instruments | Possible | Possible | Yes | Manual correlation | Manual merge |
| Easy Chester Ultimate | Yes | By configuration | Integrated | Guided | Integrated |
The exact connector, protocol, fault, safety and reporting scope is defined by the released configuration and quotation.
All-in-one, with defined test roles
AC tester + DC tester + safety tester in one portable system
All-in-one means more than placing several connectors in one case. The system connects the installation, the EV interface and the service process to the same test decision.
Electrical installation and protective measures
Protective conductor, insulation, RCD and loop-impedance checks according to the configured safety scope.
Charging state, communication and safety
Control Pilot (CP) and Proximity Pilot (PP), PLC (power line communication) and SLAC, charging protocols, voltage and current, isolation and selected fault scenarios.
Guided sequence and evidence
Clear preparation, active step, status, decision and final report for repeatable field work.
Connect. Select. Test. Verify. Report.
One guided workflow keeps field decisions in the right order
The sequence starts with a defined setup and safety context, then moves through charging and diagnosis before the result is documented.
- 1
Connect
Connect the grid-side safety interface and the charging connector required for the test.
- 2
Select
Select the charging standard, voltage technology, test scope and report context.
- 3
Test
Run guided safety, communication, function and configured fault scenarios.
- 4
Verify
Review measured values, charging states, diagnostics and the EVSE response.
- 5
Report
Document the performed scope, location, values and PASS or FAIL result.
Direct standards and connector configuration
Configure the charging interfaces your service organisation actually meets
Europe, North America and Asia require different connectors and protocol combinations. Ultimate is configured by region, charging standard, safety scope and extension requirement.
AC charging
Functional testing for AC charging processes, low-level signalling and configured high-level communication.
- IEC 61851-1
- SAE J1772 and SAE J3400 context
- ISO 15118-2/-3 where configured
- Type 1 or Type 2 by configuration
DC CCS and NACS
Direct testing of charging communication and function without routing the test through a different protocol family.
- DIN 70121 included in the published base scope
- ISO 15118-2/-3 optional
- CCS 1, CCS 2 or NACS
- SAE J3400 for NACS DC
CHAdeMO
CAN-based DC charging tests for international service networks with the released CHAdeMO configuration.
- CHAdeMO up to version 2.0 in the current datasheet
- Direct connector configuration
- Charging and communication checks
- Common guided report workflow
Two voltage technologies
Charging stations can behave differently with 400 V and 800 V vehicle technology.
- Approx. 330 V battery emulation
- Approx. 660 V battery emulation
- Repeat the decision without two real vehicles
- Compare charging behaviour under defined conditions
Safety first. Then function.
Test protective measures on the grid side and at the EV interface
comISO integrates electrical-safety checks into the same field workflow as charging communication and function.
On smaller screens, scroll the table horizontally to see every column.
| Safety function | Grid side | EV interface | Purpose in the field workflow |
|---|---|---|---|
| RPE, protective conductor resistance | Included in configured scope | Included in configured scope | Verify the protective conductor path. |
| RISO, insulation resistance | Included in configured scope | Included in configured scope | Assess insulation before or during the relevant test sequence. |
| UOFF, residual voltage | Not the grid-side function | Included in configured scope | Evaluate residual voltage at the vehicle interface. |
| tRCD, residual-current device | Included in configured scope | Included in configured scope | Test the protective response in the defined setup. |
| IMD / RISO simulation | Not the grid-side function | Included in configured scope | Verify charging-station isolation monitoring. |
| Zs, loop impedance | Included in configured scope | Not the EV-side function | Assess the installation loop path. |
Short circuit
Check whether the charging station ends charging as expected.
Short circuit or cable break
Apply a defined low-level fault instead of creating an improvised test.
Protective conductor break
Test the configured response to a protective-conductor interruption.
AC or DC fault simulation
Verify the configured isolation-monitoring function with defined fault conditions.
Follow the guided testing workflow.
See why technicians grasp the workflow so quickly
The 10.1-inch touchscreen translates a complex field process into visual, guided decisions. A live online demonstration uses the real Generation 3 device, a charging station and a webcam—so your team can judge the workflow before specifying the system.
Generation 3 product video
See the guided workflow before the live demo.
The product video provides a quick first impression of Easy Chester Ultimate Generation 3. For your own charging station, questions and service scenario, continue with the 15-minute live workflow demonstration.
Built for the service vehicle
Mobile design without reducing the test depth
Field testing depends on transport, power supply, visibility, reliable operation and access to the report. The current reference configuration is designed around those conditions.
Published values describe the current technical datasheet. The final delivered configuration and quotation remain authoritative.
The test is not finished until it is documented
Measured values, charging steps and verdict remain connected
The report can include the performed tests, detailed measurement data, charging communication steps, voltage and current, maximum charging power, MAC-PLC address, safety results and the final PASSED or FAILED result.
One system across the field workflow
Use the same controlled method for commissioning, maintenance and repair
A repeatable test process makes results comparable across technicians, locations and service cases.
Verify before handover
Check installation, safety, communication and charging function before the charging station enters operation.
Inspect the installed system
Repeat a defined scope at scheduled intervals and record the condition.
Reproduce the complaint
Separate grid, safety, signalling and communication causes instead of relying on one error message.
Verify the correction
Run the relevant test before and after the intervention and preserve both results.
Make the operational consequence visible
What do unavailable charger-hours and repeat visits cost?
Use your own installed-base, incident, downtime and field-service values. The transparent calculator compares the current service process with a scenario you define—without hidden benchmarks or product promises.
Support, updates and field data
Keep the tester connected to the service process
The optional maintenance package connects firmware, support, location and reporting functions to the field workflow.
FOTA
Firmware and software updates over the air when a hotspot is available.
Remote support
comemso support can assist with troubleshooting during published support hours.
128 GB storage
Local storage for test data, reports and instructions.
GPS and report transfer
Add location context and send the report by e-mail when connected.
When a quick check is not enough
Extend charging duration or DC load for deeper field validation
Some faults appear only after several minutes, during backend interaction or under higher load. The released add-ons extend the controlled test window.
Extend the charging session up to 60 minutes
Investigate backend communication, billing, stability and faults that occur only after a longer operating period.
Test up to 30 kW and 90 A per load
Cascade two published load units for up to 60 kW and 180 A. The current datasheet specifies operation up to four hours, depending on configuration and limits.
Released scope and roadmap
Keep today’s protocol capability separate from the next release.
Ultimate remains a practical field tool as the communication baseline evolves. The exact connector, region and protocol release are confirmed with the delivered configuration.
AC and DC without TLS
ISO 15118-2 testing without TLS is available for AC and DC in the released scope.
ISO 15118-20 without TLS
The planned extension adds ISO 15118-20 testing without TLS. It is labelled as roadmap until the corresponding release is available.
Why the 2027 AFIR transition matters
For relevant newly deployed or renovated public charging points, the delegated technical specifications introduce an EN ISO 15118-20 route from 1 January 2027. Ultimate therefore remains an important verification tool after that date: it can demonstrate released protocol behaviour and produce technical evidence for the defined scope—not complete AFIR conformity.
Technical information and field guidance
Verify the configuration before specifying the system
Use the brochure for the product story, the datasheet for published technical values and the inspection guide for the field process.
Where every EVSE test task fits
Seven lifecycle phases, their test priorities and the matching EVCA and Easy Chester product routes in one view.
Open lifecycle overview Product brochureGuided EVSE testing in the field
Product architecture, standards, safety, user workflow, field design and extensions.
Open brochure Technical datasheetReleased technical reference
Interfaces, standards, measurements, dimensions, protection, options and report functions.
Open datasheetCustomer references
Customer experience with the Easy Chester product family
Experiences with Easy Chester and the Mini-Charger-Tester, shared by customers in charging infrastructure and field service.
“As a product-independent full-service provider for sustainable charging systems, comemso not only convinced us because of their market establishment, but above all because of the manufacturer-independent application options. In this way, we can guarantee our customers quick service calls and feedback on the reliable functioning of their charging points.”
“We’ve been using the comemso Mini-Charger-Tester to test our hyper-fast charging, and we’re impressed by the ease of use, stability and precision of the compact solution.”
“Comemso offers innovative solutions to the industry, offering support and a quality product. Highly recommended!!”
“Fantastic piece of testing kit.”
Frequently asked questions
Easy Chester Ultimate FAQ
What is Easy Chester Ultimate?
Easy Chester Ultimate is a portable, guided EVSE field test system for commissioning, maintenance, service, repair and recurring inspection. It combines AC and DC charging tests, communication, configured fault simulation and electrical safety tests.
When is Easy Chester Ultimate the right tool for EVSE testing?
Easy Chester Ultimate fits guided commissioning, maintenance, repair verification and recurring inspection of installed charging stations. It represents the vehicle-side behaviour and combines the charging, communication, safety and configured fault checks available in the selected system.
For deeper laboratory qualification, high-power test configurations or investigation of an actual vehicle–charger pairing, first define the required electrical and diagnostic scope and review the corresponding EVCA system.
Plan charging-station commissioning and service tests · Compare the EVSE testing workflows
Can Easy Chester Ultimate test AC and DC charging stations?
Yes. The published configuration options include AC, CCS 1, CCS 2, NACS and CHAdeMO. The exact connector combination, protocol version and regional release must be defined for the delivered system.
Can it test without a real electric vehicle?
Yes. A successful charge with a production vehicle confirms only that this vehicle and charging station charged together under those conditions. An EV is not an EVSE test instrument: it does not provide defined, repeatable checks of charging behaviour, safety functions and fault responses. Easy Chester Ultimate acts as a controlled vehicle-side test partner. It allows the relevant charging, safety and configured fault scenarios to be repeated and assessed within the selected test scope. It charges? Good. Now test it. Done means tested.
Which charging standards are supported?
The current datasheet lists DIN 70121, IEC 61851-1, SAE J1772, SAE J3400, CCS 1, CCS 2, NACS and CHAdeMO up to version 2.0. ISO 15118-2 without TLS is available for AC and DC. ISO 15118-20 without TLS is planned for Q1/2027 and remains a roadmap item until release. Exact availability depends on configuration.
What does comISO test?
The published safety scope includes protective-conductor resistance, insulation resistance, residual voltage, RCD testing, isolation-monitoring simulation and loop impedance. The applicable function depends on whether the connection is made to the grid side or EV interface.
Field workflow planning
Choose the tool from the service question.
Describe the installed EVSE, required check, site conditions and result format.
Plan your EVSE inspection workflow.
Request the EVSE Inspection Guide by email.
Select the lifecycle task first
Easy Chester Ultimate is the field system, not the entire product family
Clear product roles prevent a commissioning tester, calibration system and production tester from being treated as interchangeable.
Ultimate
Commissioning, service, repair and periodic inspection of installed charging stations.
Mobile calibrationCalimera
Traceable on-site calibration and metrological verification.
ProductionEOL
Repeatable end-of-line function tests, product identity and traceability.
EVCA Platform
Deep protocol analysis, simulation, manipulation, automation and conformance testing.