| DC Output Power | Common rapid-charging configurations include 20–60 kW, 60–180 kW, 180–360 kW, and higher-power systems. | The required power depends on vehicle compatibility, parking duration, grid capacity, and site traffic. | Request rated power, peak power, continuous power, power-sharing behavior, and derating curves. |
| Output Voltage Range | Many modern DC fast-charging systems support an output range approximately covering 200–1,000 V DC, depending on the model. | A broad voltage range improves compatibility with different passenger cars, buses, and commercial vehicles. | Confirm minimum and maximum output voltage, voltage accuracy, and compatibility with the target vehicle battery platform. |
| Maximum Charging Current | High-power liquid-cooled systems may support several hundred amperes; the exact current limit varies by connector, cable, and charger design. | Higher current can reduce charging time but increases thermal-management and installation requirements. | Check continuous current, peak current, cable cooling method, connector temperature monitoring, and cable length. |
| Connector and Charging Standard | Common options include GB/T for mainland China and CCS1, CCS2, or CHAdeMO for specific overseas markets. | Connector selection must match the vehicles and legal requirements in the intended market. | Confirm connector version, pin configuration, regional approval, cable rating, and availability of dual-standard configurations. |
| Communication Protocol | OCPP 1.6J remains widely deployed, while OCPP 2.0.1 supports newer device-management and security functions. | Protocol compatibility affects integration with charging-network software, payment systems, and remote operations. | Request protocol version, supported profiles, API documentation, firmware-update process, and interoperability test results. |
| Electrical Efficiency | Well-designed modern DC chargers commonly target peak efficiency above 95%, although efficiency varies with load and temperature. | Higher efficiency reduces energy losses, operating costs, and heat generation. | Ask for efficiency curves at 25%, 50%, 75%, and 100% load, along with standby power consumption. |
| Power Factor and Harmonics | Commercial fast chargers are generally expected to provide high power factor and controlled harmonic distortion when connected to public or industrial grids. | Good power quality helps reduce grid impact and supports compliance with local utility requirements. | Request power-factor data, total harmonic distortion results, and applicable grid-compliance test reports. |
| Safety Protection | Typical protection functions include overvoltage, overcurrent, short circuit, ground fault, overtemperature, surge, and emergency-stop protection. | Comprehensive protection reduces risks to users, vehicles, electrical equipment, and the site. | Review the protection list, fault-response time, emergency-stop behavior, insulation monitoring, and safety test records. |
| Ingress and Impact Protection | Outdoor cabinets are often specified with an IP rating such as IP54 or higher; the exact requirement depends on the installation environment. | Protection against dust, rain, moisture, and accidental impact is essential for outdoor reliability. | Verify IP and IK test reports, corrosion protection, drainage design, operating altitude, and temperature range. |
| Cooling Architecture | Air cooling is common for lower and medium power; liquid cooling is used for higher-current cables and high-power charging applications. | Cooling design influences noise, cable weight, maintenance, power density, and continuous output. | Confirm cooling medium, fan or pump redundancy, coolant monitoring, maintenance intervals, and noise level. |
| Grid Input Requirements | Three-phase AC input is common for commercial DC fast chargers, with voltage and frequency selected for the destination market. | The input specification determines transformer capacity, cabling, protection devices, and connection cost. | Request input voltage range, frequency, maximum input current, inrush current, breaker requirements, and recommended transformer size. |
| Certification and Market Compliance | Required approvals vary by destination and may include regional electrical, EMC, safety, metrology, and radio requirements. | A charger cannot be legally installed or operated in every market using the same documentation. | Obtain certificates, declarations, test reports, scope pages, certificate-holder details, and confirmation that the documents cover the exact model. |
| Remote Monitoring and Payments | Common functions include remote status monitoring, fault alerts, transaction records, user authentication, and tariff management. | These features support unattended operation and reduce the cost of field service. | Check dashboard functions, payment options, data ownership, cloud hosting location, cybersecurity controls, and offline operation. |
| Installation and Site Adaptability | Important factors include cabinet footprint, cable reach, foundation requirements, ventilation clearance, and service access. | A compact and serviceable design can reduce civil-work costs and improve uptime. | Request dimensional drawings, foundation plans, cable-entry details, lifting instructions, clearance requirements, and installation manuals. |
| Warranty and Spare Parts | Warranty terms should clearly define coverage for power modules, connectors, control boards, displays, cooling components, and labor. | Transparent warranty coverage limits unexpected ownership costs. | Confirm warranty duration, exclusions, replacement procedure, spare-parts availability, repair locations, and response-time commitments. |
| Factory Quality Control | A reliable production process should include incoming inspection, assembly checks, insulation testing, functional testing, burn-in, and final inspection. | Consistent testing helps reduce early failures and field installation problems. | Request quality procedures, sample test records, serial-number traceability, factory-acceptance criteria, and audit access. |
| Total Cost of Ownership | Purchase price should be evaluated together with installation, grid upgrades, energy losses, software fees, maintenance, spare parts, and downtime. | The lowest initial price does not necessarily provide the lowest lifetime operating cost. | Request a five-year cost model with energy efficiency, service, software, replacement parts, and estimated availability assumptions. |