Common Mistakes to Avoid When Purchasing a DC EV Charging Station
Aug 20, 2026
DC Charger Procurement Guide
Common Mistakes to Avoid When Purchasing a DC EV Charging Station
A DC EV charging station can meet its published specifications and still be unsuitable for the project. Purchasing errors usually happen when rated power is considered without checking vehicle voltage, charging current, grid capacity, simultaneous output, communication functions, installation conditions and after-sales responsibilities.
Early Warning
Twelve Purchasing Mistakes That Create Project Risk
Selecting by rated power alone
A 240kW cabinet does not guarantee that every vehicle will receive 240kW. Vehicle acceptance, voltage, current and charging curves limit actual output.
Ignoring output voltage
A charger must provide a voltage range compatible with the battery systems expected at the site, including applicable 400V and 800V platforms.
Overlooking current limits
High nameplate power may be unavailable at a lower vehicle voltage if the charger or cable reaches its maximum current first.
Assuming both ports deliver full power
Dual connectors may share cabinet output. Buyers must confirm simultaneous power, allocation rules and maximum current per connector.
Ordering before checking the grid
The transformer, switchgear, distribution cables and site peak load may not support the proposed charging capacity.
Choosing the wrong connector
CCS1, CCS2, GB/T and CHAdeMO serve different vehicles and markets. A physically incorrect interface cannot be corrected through software.
Treating "OCPP supported" as sufficient
The required version, profiles, backend compatibility, security settings and certification status must be checked individually.
Ignoring environmental derating
High temperature, low temperature, altitude, restricted airflow and direct sunlight can affect available output and equipment life.
Focusing only on equipment price
Electrical upgrades, civil work, software, payment services, maintenance and electricity tariffs can exceed the difference between charger quotations.
Leaving maintenance undefined
A warranty is not a complete service plan. Response time, labor, spare parts, remote support and repair responsibilities must be stated.
Skipping interoperability tests
Vehicle communication, payment, RFID, backend and remote-control functions should be tested before a large deployment.
Buying without an expansion plan
A charger may meet current demand while the site layout leaves no practical route for additional power, cables or parking bays.
Mistake 01
Do Not Confuse Rated Power with Vehicle Charging Power
The charger supplies power according to the request negotiated with the vehicle. Battery temperature, state of charge, battery voltage and the vehicle charging curve can all reduce actual output.
| Specification | What it tells the buyer | What it does not guarantee |
|---|---|---|
| Rated output power | The maximum cabinet output under stated operating conditions | That every vehicle accepts this power throughout the session |
| Output voltage range | Battery voltages the charger is designed to serve | That maximum power is available at every voltage |
| Maximum current | The charger or connector current ceiling | That this current can be sustained in all temperatures |
| Dual connectors | Two vehicles may be connected or charged according to the configuration | That both connectors independently receive full cabinet power |
| Peak vehicle charging rate | The vehicle's maximum under suitable battery conditions | That the vehicle maintains its peak from low to high state of charge |
Mistakes 02–03
Check Voltage and Current Together
Power is approximately equal to voltage multiplied by current. A charger rated at 200kW may require different current levels when charging vehicles with different battery voltages.
| Target power | Vehicle voltage | Approximate required current |
|---|---|---|
| 120kW | 400V | 300A |
| 200kW | 400V | 500A |
| 200kW | 800V | 250A |
| 240kW | 800V | 300A |
These simplified calculations exclude conversion losses and do not represent a specific vehicle's charging curve.
Questions for the supplier
- Voltage: What is the complete DC output range?
- Current: What is the maximum per connector?
- Power curve: Is full power available across the entire voltage range?
- Cable: Is it air-cooled or liquid-cooled?
- Derating: When is current or power reduced?
- Simultaneous use: How is output shared?
Mistake 04
Confirm What "Dual Gun" Actually Means
| Dual-port arrangement | Possible behavior | Buyer must confirm |
|---|---|---|
| One active connector at a time | Two standards or parking positions are provided, but only one charges | Whether simultaneous charging is supported |
| Fixed power split | Cabinet output is divided into predefined connector limits | Maximum output available to each vehicle |
| Equal power sharing | Available output may be divided evenly when two vehicles connect | What happens when one vehicle requests less power |
| Dynamic allocation | Power modules are reassigned according to real-time vehicle demand | Allocation increments, priorities and switching behavior |
| Different connector standards | Two connector types serve different vehicle groups | Whether both standards can operate simultaneously |
See the detailed comparison of single-gun and dual-gun DC chargers before specifying the number of charging bays.
Mistake 05
Do Not Order the Charger Before Completing a Site Power Review
Transformer capacity
Check rated capacity, existing demand, allowable loading and planned building or fleet expansion.
Switchgear and protection
Confirm the required breakers, protection coordination, isolation and available panel capacity.
Cable route
Measure the distance between the electrical source and charger, including trenches and voltage-drop considerations.
Peak demand
Compare expected charging periods with the site's existing daily and seasonal load profile.
Utility tariff
Energy, time-of-use and demand-charge structures can affect operating costs.
Expansion allowance
Reserve capacity for additional vehicles and chargers where future demand is reasonably expected.
Mistake 06
Select Connectors from the Destination Market and Vehicle Fleet
| Connector standard | Typical purchasing context | Checks before ordering |
|---|---|---|
| CCS1 | Projects serving compatible North American vehicles | Local regulations, vehicle population, communication and cable rating |
| CCS2 | Many European and other CCS2 markets | Required standards, vehicle voltage, current and payment requirements |
| GB/T | Vehicles designed for applicable Chinese charging standards | Communication protocol, auxiliary supply and destination-market acceptance |
| CHAdeMO | Existing compatible Japanese and selected legacy vehicle populations | Actual local demand and whether a dedicated or mixed-standard connector is justified |
| Mixed connector station | Sites serving more than one established vehicle group | Simultaneous operation, power sharing, labeling and backend reporting |
Mistake 07
Do Not Accept a General "OCPP Compatible" Statement
- Protocol version: specify OCPP 1.6, 2.0.1 or another required version.
- Transport format: confirm the required implementation and backend connection method.
- Required functions: list authorization, transactions, reservations, smart charging, diagnostics and firmware management.
- Security: define certificates, encryption, credentials and update procedures.
- Backend platform: test the charger with the management system selected for the project.
- Offline behavior: determine what the charger should do when network communication fails.
- Certification: distinguish official independent certification from a supplier's self-declaration.
Official OCPP certificates should be checked against the Open Charge Alliance certified-product records. The charger model, software and certified profiles should match the equipment being offered.
Software acceptance test
- Connect: charger registers with the backend
- Authorize: RFID or selected access method works
- Start: transaction begins correctly
- Report: energy and status data are received
- Control: remote start, stop and reset operate
- Recover: charger handles network loss
- Update: firmware process is verified
Mistake 08
Check the Real Installation Environment
| Environmental factor | Why it matters | Information to verify |
|---|---|---|
| Ambient temperature | High or low temperatures may affect output and component operation | Operating range and power-derating curve |
| Direct sunlight | Solar heat can increase internal cabinet temperature | Placement, shading and ventilation requirements |
| Altitude | Reduced air density can affect cooling and insulation design | Maximum altitude without derating and correction requirements |
| Water and dust | Outdoor exposure affects enclosure and component protection | IP rating, drainage, cabinet seals and maintenance |
| Humidity and condensation | Moisture can affect insulation and electronic components | Permitted humidity range and condensation controls |
| Corrosive environment | Salt, chemicals or industrial pollutants may damage the enclosure | Coating, material and maintenance requirements |
| Restricted airflow | Walls, other cabinets or debris can interfere with cooling | Required clearance around air inlets and service panels |
For outdoor projects, review DC charger IP ratings and indoor versus outdoor installation.
Mistake 09
Compare Total Project Cost, Not Only Charger Price
| Cost category | Examples | Common purchasing oversight |
|---|---|---|
| Charging equipment | Cabinet, dispensers, cables, connectors and payment hardware | Comparing quotations with different configurations |
| Electrical infrastructure | Transformer, switchgear, protection, meters and distribution cables | Assuming the existing electrical supply is sufficient |
| Civil construction | Foundation, trenching, conduits, drainage, barriers and markings | Excluding restoration and site-access work |
| Software and network | Backend, SIM data, payment processing and software support | Considering only the first-year fee |
| Commissioning | Configuration, vehicle tests, backend integration and staff training | Assuming installation automatically includes complete testing |
| Operation | Electricity, demand charges, transaction fees and customer support | Using only the energy price in the operating model |
| Maintenance | Inspection, filters, cables, cooling parts, labor and spare modules | Assuming warranty covers every service cost |
Mistake 10
Define Warranty and Service Responsibilities Before Ordering
Warranty scope
Identify covered components, exclusions, labor, travel, shipping and consumable items.
Response time
Define when remote diagnosis begins after a fault is reported.
Repair target
Separate initial response time from the time required to restore charging service.
Spare parts
Confirm recommended stock, replacement lead times and expected support period.
Technical access
Clarify fault logs, service software, passwords, manuals and technician training.
Firmware support
Define compatibility maintenance, security updates and responsibility for backend changes.
Mistake 11
Require Factory and Site Acceptance Tests
| Test stage | Recommended checks | Required evidence |
|---|---|---|
| Document review | Model, power, voltage, current, connectors, options and software version | Approved datasheet and configuration list |
| Factory inspection | Assembly, wiring, labels, protection and ordered customization | Inspection record and photographs |
| Electrical testing | Insulation, protection, output and applicable safety checks | Test report linked to the supplied unit |
| Vehicle simulation | Communication, voltage, current and charging-state transitions | Recorded test results |
| Backend integration | Authorization, transactions, meter values, remote commands and alarms | Completed acceptance checklist |
| Site commissioning | Installation, communication, target vehicles and emergency functions | Signed commissioning report |
Mistake 12
Do Not Leave Future Expansion Until the Parking Lot Is Finished
- Transformer: allow space or a defined route for additional supply capacity.
- Switchgear: reserve sections, breakers or connection points where appropriate.
- Conduits: install spare pathways before paving and landscaping are complete.
- Foundations: identify future cabinet and dispenser positions.
- Communications: reserve network capacity and cable routes.
- Parking: maintain usable vehicle movement and accessible bay planning.
- Software: check whether the platform can manage additional chargers and user accounts.
- Power allocation: consider modular or distributed architectures for multi-bay growth.
Expansion questions
- Year 1: How many vehicles and sessions?
- Year 3: How many charging bays?
- Power: What is the future site limit?
- Vehicles: Will voltage platforms change?
- Connectors: Will another standard be required?
- Software: Can the backend scale?
- Construction: What can be reserved now?
Procurement Workflow
A Safer Sequence for Purchasing a DC EV Charging Station
Identify vehicles, energy requirements, dwell time and peak traffic.
Check transformer, load profile, cable routes, parking and environment.
Define power, voltage, current, connectors, software and service.
Compare configurations, certificates, tests and lifecycle costs.
Complete factory, backend, vehicle and site commissioning checks.
Quotation Checklist
Information to Send Before Requesting a Charger Recommendation
- Destination: country and applicable charging standards.
- Application: public, fleet, highway, commercial parking or another use.
- Vehicles: models, battery voltage, battery capacity and daily quantity.
- Charging target: required energy per vehicle and available time.
- Peak demand: maximum vehicles expected to charge simultaneously.
- Electrical supply: voltage, transformer capacity and spare site capacity.
- Connectors: CCS1, CCS2, GB/T, CHAdeMO or mixed requirements.
- Power sharing: required output per connector during simultaneous charging.
- Management: OCPP version, backend, payment and RFID requirements.
- Environment: indoor or outdoor, temperature, altitude and weather exposure.
- Installation: cable distance, foundation and parking layout.
- Customization: color, logo, interface language and labeling.
Newcom's NEDF series includes 40–240kW configurations, DC200–1000V output, 0–300A series current, two standard connectors, IP54 protection and remote-operation support. The exact ordered configuration must be confirmed against the project specification.
Documents to request
- Datasheet: ordered model and options
- Drawing: dimensions and installation points
- Diagram: electrical connection requirements
- Power curve: voltage and current relationship
- Derating: temperature and altitude conditions
- Protocol: OCPP version and functions
- Certificates: applicable and verifiable records
- Warranty: scope and exclusions
- Service: support and spare-parts plan
Related Products and Guides
Compare Equipment Before Finalizing the Purchase
Buyer Questions
DC EV Charging Station Purchasing FAQ
What is the biggest mistake when buying a DC EV charging station?
The most common mistake is selecting equipment by rated power before checking vehicle demand and site electrical capacity. The charger should be specified after the vehicles, required energy, dwell time, simultaneous sessions and grid conditions are understood.
Does a 200kW charger always deliver 200kW?
No. Actual output depends on battery voltage, vehicle current limits, state of charge, temperature, charging curve, cable capacity, simultaneous charging and charger derating conditions.
Can a dual-gun charger deliver full power to both vehicles?
Not necessarily. Some chargers divide total cabinet output, while others dynamically allocate power. Buyers must confirm total cabinet power, maximum power per connector and simultaneous charging behavior.
How do I choose the correct DC charging connector?
Review the destination market and vehicles expected to use the station. CCS1, CCS2, GB/T and CHAdeMO are not interchangeable, so the connector and communication standard must match the target vehicles.
Is an OCPP-compatible charger guaranteed to work with any backend?
No. The OCPP version, implemented functions, security settings and backend requirements must match. Integration and transaction tests should be completed before full deployment.
Should OCPP certification be verified?
Yes. If official certification is required, buyers should verify the certificate, model, software and profiles through the Open Charge Alliance records rather than relying only on a logo or supplier statement.
What costs should be considered beyond the charger price?
Include transformer and switchgear upgrades, cabling, trenching, foundations, permits, networking, payment fees, backend services, electricity tariffs, demand charges, commissioning, maintenance and spare parts.
What should be included in a DC charger warranty?
The warranty should identify the covered components, duration, exclusions, labor, travel, shipping, remote support and spare-part responsibilities. Response and repair targets should be addressed separately.
What information is needed before requesting a DC charger quotation?
Provide the country, application, vehicle types, battery voltage, required energy, dwell time, peak traffic, simultaneous sessions, electrical capacity, connector standards, target power, OCPP platform, environment and expansion plan.
Review the Vehicle, Site and Software Before Ordering the Charger
Send the target vehicles, energy requirement, charging window, connector standards, simultaneous sessions, transformer capacity, OCPP platform and installation conditions.
Project Inquiry
DC EV Charging Station Purchasing Request
Include the destination country, application, target vehicles, battery voltage, required energy per vehicle, charging window, peak traffic, simultaneous connector requirements, electrical capacity, connector standards, OCPP platform, installation environment and expansion plan.
