Solar Inverter Quality Inspections

Hire our specialized quality engineers on-site at the solar inverter factories in Asia

10+ Years

At the PV and BESS Factories in Asia

17.6+ GW

Zero Risk Solar® Projects




PV & BESS Factories Audited

Why Choose Sinovoltaics Solar Inverter Quality Inspections?

Our specialised quality engineers will monitor production, and perform conformity checks, and validations throughout the inverter production cycle. This allows us to detect and address inverter quality issues at an early stage. Our deliverables include prompt communication of any abnormalities identified during manufacturing, and on-site quality issue-solving prior to shipment.

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On-site Solar Inverter Quality Inspection

Service includes:

  • Pre-Production Factory Audit
  • On-Site Inverter Production Monitoring and Raw Material Verification:

      1. Bill of Materials (BOM) verification

      2. Standards compliance:

          - International standards and directives

          - National grid standards & codes

          - System standards

      3. Factory Acceptance Testing (FAT)

          Perform over a dozen tests, including:

          - Inverter body and structure test    - Dielectric strength                           

          - Grounding resistance test              - Normal input and output

          - Soft start-up                                      - Automatic startup/ shutdown

          - Communication test                        - Maximum efficiency test

          - Grid-tied THDi                                   - DC input overvoltage test

          - Anti-islanding test                            - Grid-tied recovering

          - Continuous aging test                     - Restoring factory defaults

          - AC output over-frequency/ under-frequency test

          - AC output overvoltage/under-voltage

  • Pre-Shipment Inspection (PSI), Inverter Testing, and Final Report
  • Packing and Loading Supervision: quality assured inverters are shipped

Our inspection services ensure that your solar inverter meet and exceed the industry's most stringent standards:

  • EN 50524 (Data Sheet and Name Plate for Photovoltaic Inverters)
  • EN 50530 (Overall Efficiency of Photovoltaic Inverters)
  • UL 1741 (Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources)
  • IEC 61683 (Power conditioners – Procedure for measuring efficiency)
  • IEC 62109-1 (Safety of Power Converters for Use in Photovoltaic Power Systems – Part 1: General Requirements)
  • IEC 62109-2 (Safety of Power Converters for Use in Photovoltaic Power Systems – Part 2: Particular Requirements for Inverters)

A selection of inverter factories where our inspection team has been active:

  • Chint Power
  • Growatt
  • Huawei
  • INVT Solar
  • Sofar solar
  • Solax Power
  • Solis 
  • Sungrow
  • Goodwe

Sinovoltaics uses ISO 2859-2:1999 as the sampling standard

ISO sampling is applied to make sure that your shipment adheres to our strict quality standards. The right sampling quantity is important; with a statically representative sample rate, you can rest assured that our inspection findings are conclusive.

Interested? Please select ‘Inverters’ under ‘Product to inspect’ on the Order Inspection form on the right side of this page, to receive fitting information for your inquiry.

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Quality Inspection Expertise

  • PV Modules (solar modules)
  • Mounting Systems
  • Inverters
  • Solar Cells
  • Trackers
  • Transformers
  • Turnkey Stations

  • Cables
  • Charge Controllers
  • Cleaning Robots
  • Combiner Boxes
  • DC Disconnects
  • Floats (Floating PV)
  • Solar Street Lights

Assuring solar PV and energy storage quality on-site in Asia-Pacific for over 10 years...

Since 2009, Sinovoltaics has audited over 300+ solar PV and battery energy storage factories across Asia-Pacific.

Our solar PV and battery energy storage component-specialized auditors are accredited with the International Register of Certificated Auditors (IRCA) and are proud to support you with a comprehensive and insightful assessment of prospective suppliers by using their extensive experience in the operations management of PV and BESS factories in Asia.

Headquartered in Hong Kong, and with offices in Shanghai, Switzerland, USA, and Vietnam and local quality inspection and audit teams in India, South Korea, Thailand, and Türkiye, we are strategically located close to all solar PV component and battery energy storage manufacturing bases and shipping ports in Asia and North America.

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