How to Verify a Chinese Solar Supplier: Entity, Factory, Certificates and Claims

Short answer. Verify five things separately, identify the entity behind each, and reconcile how those entities are related: (1) the legal entity, using its 18-character unified social credit code; (2) the public registration record; (3) the factory that will make your order; (4) model-level certificates from the certification body's own database; and (5) any marketing claim such as "Tier 1", checked against the original source. The contracting entity, the brand owner, the manufacturer and the certificate holder can legitimately be different companies in one group; what must match exactly is the entity on the contract, the invoice and the receiving bank account. (Editorial method.) A sales deck, a PDF certificate sent by email or a press release is a starting point, not evidence.

Key terms

• Unified social credit code (USCC, 统一社会信用代码) — China's 18-character identifier for legal persons and other organisations, introduced under State Council notice Guofa [2015] No. 33.
• National Enterprise Credit Information Publicity System (国家企业信用信息公示系统) — the public system through which registration data, pledges, penalties and company annual reports are published under the Interim Regulation on Enterprise Information Disclosure (2014, revised 2024).
• Design qualification (IEC 61215) and safety qualification (IEC 61730) — two IEC standard families for terrestrial PV modules; both apply to crystalline silicon and thin-film module types.

Step 1 — Pin down the legal entity

Ask for the contracting entity's full Chinese name and its USCC, exactly as on the business licence. The code has 18 characters in five parts: registration-authority code, entity-type code, the registration authority's administrative-division code (characters 3–8), a 9-character subject identifier (characters 9–17) and a check character (character 18). One entity can hold only one code, and one code belongs to only one entity.

What this gives you:

• a stable key for matching the contract, invoices and bank details to the same entity, and for telling related group companies apart;
• a rough location check: characters 3–8 encode where the registering authority sits.

Common mismatch: the brand on the datasheet belongs to a group company, while the contract is signed by a trading subsidiary in a different city. That may be legitimate, but every later check must then be done on the entity that actually signs and the entity that actually manufactures. (Editorial method.)

Step 2 — Read the public registration record

Under the Interim Regulation (as revised in 2024), the market regulation authority publishes registration and filing information, chattel-mortgage registrations, equity-pledge registrations and administrative penalties through the National Enterprise Credit Information Publicity System, within 20 working days of the information arising. Companies must also file and publish the previous year's annual report through the system between 1 January and 30 June.

Know the limits: financial items in that annual report — headcount, total assets and liabilities, guarantees, revenue, profit, tax paid — are made public only if the company chooses to. A blank financial section is therefore not, by itself, a red flag, and a filled one is self-reported.

Check at least: registration status, registered capital and shareholders, business scope (does it include manufacturing, or only trading?), pledges over equity or movable assets, and administrative penalties.

Note: this guide does not reproduce the system's interface or URL (the site could not be retrieved by our checker). The cited articles are from the current consolidated text, revised by the State Council on 10 March 2024.

Step 3 — Identify the factory

Ask which factory (address and operating entity) will produce your order, and whether any production is outsourced. Then confirm that the certificates in Step 4 name that factory or that manufacturer. Certificates and audit reports can name a specific manufacturer and production site, so a certificate for another site or entity does not cover your order. (Editorial method.)

Step 4 — Verify model-level certificates at the source

For PV modules, the core IEC references are:

Table note: scope wording from the IEC webstore abstracts; the standards' full texts were not read.

How to check a certificate:

1. Look up the certificate number in the issuing body's own database, not only the PDF the supplier sent. TÜV Rheinland, for example, runs the public Certipedia database; its navigation links to a TÜV Rheinland warning list of test-mark misuse and falsified certificates and test reports, which TÜV says is not exhaustive.
2. Match the certificate holder, the factory address and the model list to Steps 1 and 3.
3. Check the standard edition and the validity dates on the database record.

If you sell into California, the California Energy Commission's Solar Equipment Lists cover PV modules, inverters, meters, batteries and storage systems and are updated three times a month. The CEC notes that manufacturers' self-reported information is not confirmed and that it makes no claim or warranty on listed equipment's safety, performance or durability. A listing is an eligibility check, not a quality endorsement.

Step 5 — Treat claims as claims

"Tier 1", "top 10" and "No. 1 in shipments" need their original source. For example, BNEF states that press releases and company claims are not evidence that a firm meets its Tier 1 criteria, and only the latest quarter's list is valid. See our guide on what “Tier 1” means (linked below).

For rankings, ask: which metric (shipments, capacity, revenue), which year, which consolidation scope, and who published it.

Verification checklist

Rows 3 and 7 are CNWattHub editorial method.