04/21/2020
Audit Insights: How Does a Factory Audit Go?
Identifying the right factory determines the future of your products, because the capabilities and capacity of your manufacturer have to align with your needs and expectations.
1. Production Process and Common Quality Issues for EV Chargers
Click to review the detailed production process and common quality issues for EV chargers.
2. Ensuring EV Chargers' Safety & Compliance with Laboratory Testing
We arrange laboratory testing to confirm adherence to international safety and performance standards:
- IEC 61851 (EV Charging System General Requirements)
- UL 2231 (Personal Protection Devices for Electric Vehicle Supply Circuits)
- SAE J1772 (EV and PHEV Conductive Charge Coupler)
- CE Marking (European Conformity)
- RoHS (Restriction of Hazardous Substances)
- FCC Part 15 (Electromagnetic Compatibility)
- UN 38.3 (Lithium Battery Transportation Safety)
- IEC 62196 (Plugs, Socket-Outlets, Vehicle Connectors and Vehicle Inlets)
3. Common Defects in EV Chargers Inspections
Electrical & Safety Issues
- Short circuits or loose wiring
- Overheating during charging
- Ground fault interrupter (GFI) malfunction
- Inadequate insulation or poor grounding
- No interrupter when over charging
Functional & Performance Problems
- Charging interruptions or failures
- Inaccurate power delivery
- Communication errors with EV
- Display screen malfunction
- Slow charging speed
Mechanical & Structural Defects
- Damaged charging cables or connectors
- Cracked or poorly sealed enclosures
- Loose mounting hardware
- Inconsistent button or switch operation
- Water ingress due to poor sealing
Software & Firmware Issues
- Connectivity problems (Wi-Fi, Bluetooth)
- Incorrect charging protocols
- Software glitches causing system crashes
- Inaccurate data logging
Appearance & Cosmetic Flaws
- Scratches, dents, or discoloration on casing
- Misaligned components
- Poor paint finish or uneven coatings
- Damage on the cord
Packaging & Labeling Issues
- Incorrect product information on packaging
- Missing user manuals or installation guides
- Damaged or inadequate protective packaging
- Incorrect barcodes or serial numbers
4. Which EV Chargers Products Do We Have the Most Experience With?
Residential EV Chargers
- Level 1 Portable Chargers
- Level 2 Wall-Mounted Chargers
- Smart Home Integrated Chargers
Commercial & Public EV Chargers
- Level 2 Public Charging Stations
- DC Fast Chargers (Level 3)
- Fleet Charging Solutions
Specialized EV Charging Equipment
- V2G (Vehicle-to-Grid) Chargers
- Wireless EV Charging Systems
- E-Bus and Heavy-Duty Vehicle Chargers
5. Our EV Chargers Quality Control Services
Product Inspection
Verify quality, functionality, and craftsmanship at every production stage.
Laboratory Testing
Ensure compliance with global safety, regulatory, and performance standards.
Parameter and Protection Function Check
App Connection and Function Check
6. How V-Trust Helps You Find the Right EV Chargers Supplier
We conduct supplier audits to verify production capabilities and compliance before order placement.
Factory Audit
Quick verification of supplier legitimacy through:
- Factory existence and document verification
- Basic production capacity review
- Contact person verification
In-Depth Factory Audit
A comprehensive evaluation covering:
- Production capacity & facility assessment
- Quality control system evaluation
- Social compliance verification
7. How V-Trust Helps You Control the Quality of EV Chargers
V-Trust offers a comprehensive quality control solution for EV chargers, including Sample Checks, Production Monitoring, During Production Inspection, Pre-Shipment Inspection, and Container Loading Supervision, ensuring your products meet stringent safety and performance standards before they reach the market.
Sample Check
Our engineers meticulously evaluate EV charger samples for critical aspects such as power output accuracy, communication protocols (e.g., OCPP), connector compatibility, and enclosure durability. This pre-production assessment helps identify design flaws and material weaknesses, enabling buyers to select reliable suppliers and ensure the product meets all technical specifications.
Production Monitoring
During the manufacturing process, our inspectors provide continuous on-site monitoring of EV charger production. This includes verifying correct assembly of internal components, proper wiring, and adherence to soldering standards. Real-time oversight helps to promptly address issues like component misplacement or faulty connections, minimizing defect rates and ensuring consistent quality throughout the production run.
During Production Inspection
When at least 10% of the EV charger order is completed, our team conducts a detailed mid-production inspection. This critical check focuses on identifying early-stage problems such as incorrect PCB assembly, power module defects, or enclosure sealing issues. Catching these problems early allows for timely corrective actions, preventing widespread defects and potential production delays.
Pre-Shipment Inspection
Before shipment, a thorough final inspection is performed on your EV Chargers. This comprehensive check verifies overall product quality, functionality (e.g., successful charging cycles, display accuracy), and compliance with all specified standards. We also confirm cosmetic integrity, proper labeling, accurate quantity, and secure packaging to ensure the products are ready for market.
Container Loading Supervision
Our team supervises the container loading process to ensure EV Chargers are handled with care, correctly stacked, and securely packed within the container. This service prevents damage during transit, verifying that protective materials are properly used and that the correct quantity and type of chargers are loaded, safeguarding your investment until delivery.
8. The Most Related Sourcing Fairs in Asia
November, 2026 (based on past patterns)
Asia PVSC System and Charging Facility Industry Expo (EVSE China Shenzhen)
Shenzhen World Exhibition & Convention Center, Shenzhen, ChinaShowcases smart and high-power charging stations, PV+ESS integration, EV battery technologies, energy management platforms, and smart city infrastructure.
https://www.evsechina.com/en/
November 10-12, 2026
EVM Asia
Malaysia International Trade and Exhibition Centre (MITEC), Kuala Lumpur, MalaysiaHighlighting the latest in electric vehicles, hybrid technologies, charging infrastructure, and smart mobility solutions.
https://www.smartnationexpo.org/evm-asia/
July 1-3, 2026
Electric Vehicle Asia
Queen Sirikit National Convention Center, Bangkok, ThailandCovering electric trains and components, battery management systems, monitoring and control equipment, and crucially, charging stations.
https://www.asew-expo.com/
Why Choose V-Trust for EV Chargers Quality Control?
20
Years of Experience
650+
Trained Inspectors
10
Asian Countries
13.000
Satisfied Clients
Asia's leading product inspection company with full-time, professionally trained inspectors and comprehensive accreditation for inspection, audit, and lab testing services.
EV Chargers Quality Control: Frequently Asked Questions (FAQ)
Why do I need product inspections for EV chargers?
If you are worried about or have experienced problems such as poor quality, incorrect shipments, or wrong packaging for goods imported from Asia, product inspection services is your solution. V-Trust product inspection service can help you have accurate understanding about the quality of the goods without going to the factory by yourself.
Do I need to send you an approved sample for EV chargers?
It would be great if you can send the approved sample to V-Trust before the inspection for reference. Compared with product photos or specification documents, a real product sample allows V-Trust engineers to do a more thorough comparison check.
How many days in advance should I book the inspection?
Though sometimes it's possible to book next-day inspections for many manufacturing clusters where V-Trust has a large team of full-time inspectors, we recommend booking with us at least three days in advance. Early booking is important for appropriate scheduling and good preparation before the inspection.
Who will I be in contact with throughout the whole process?
There will be one dedicated account manager who will be assigned as your main contact point at V-Trust. You will receive prompt responses whenever you have any questions regarding the inspection arrangement.
How long does it take to know the inspection result?
The official report, reviewed and signed by an authorized V-Trust technical manager, will be available within 24 hours after each inspection. Same day report is available if you would like to know about the inspection findings on the same day. V-Trust has the highest same day report rate in the inspection industry.
What if I have questions after I check my V-Trust report?
Please don’t hesitate to contact us whenever you have any questions. V-Trust team is always available even after the inspection is completed.
Request Your Inspection Today
Ready to ensure the quality of your products? Contact our team to discuss your specific requirements.