Skip to main content
JUSTSOLAR — Solar Module Manufacturer
Free B2B Resource · 50 Points · 8 Sections · 18 KB PDF

Solar Module Factory Audit Checklist
50-Point B2B Buyer's Guide (2026)

Use this on YOUR audit of any solar module manufacturer — including us. Built from 14 years of being on both sides of solar shipments. Every item is actionable: tick on-site, request docs, or escalate.

50
Points
8
Sections
100%
B2B Focus
FREE
To Use

Use cases: Pre-shipment inspection (PSI) · Factory visits · Supplier qualification · Module RFP evaluation · Internal procurement standard · EPC due diligence pack

Get your free PDF

Drop your work email + we send the 50-point checklist + add you to our weekly B2B solar insights (unsubscribe any time, address never shared).

Frank Yang signs every weekly email. Unsubscribe any time. We never share your address.

What's inside the checklist

Eight categories covering every dimension procurement and engineering teams verify. Sample items shown — full 50 in the PDF.

Section 018 items

Manufacturer Verification

Verify the company is a real factory — not a trader rebadging panels.

☐Business license valid + matches PI entity
☐Production output matches claims (12-month volume audit)
☐Independent factory audit (SGS/TUV/BV) ≤12 months old
☐Same address on PI, license, and factory map
+ 4 more in PDF
Section 027 items

Production Equipment

Walk the line. Real manufacturers are proud to show equipment brands + serial numbers.

☐Stringer brand visible (Autowell, 晶盛 industry standard)
☐Lamination press brand (YAC, GP Solar — not generic)
☐Flash tester is class A+A+A+ sun simulator (Pasan/Spire)
☐Calibration records ≤12 months for ALL test equipment
+ 3 more in PDF
Section 038 items

Quality Control Process

100% testing per module — not sample-based. Critical pass/fail items.

☐100% EL test post-lamination, archived per serial number
☐Hi-Pot insulation test, fail = scrap policy (no rework)
☐Flash test under STC, IV curve recorded with SN
☐Power tolerance is 0/+5W positive only
+ 4 more in PDF
Section 046 items

Material Quality

What goes into the module — provenance + spec + brand.

☐Cell brand documented (Tongwei, Aiko, LONGi tier-1)
☐Encapsulant: EVA or POE (POE for HJT mandatory)
☐Backsheet: TPT/PVDF brand (DuPont Tedlar / Krempel)
☐Frame: anodized 6063-T5 / 6005-T6 (not mill-finish)
+ 2 more in PDF
Section 057 items

Documentation & Certifications

Paper trail proves real compliance — no paper means no warranty defense.

☐IEC 61215 design qualification report (your exact SKU)
☐IEC 61730 safety cert (Class A or Class II)
☐ISO 9001/14001/45001 (all three, valid date)
☐Insurance-rated bankability letter (Atradius/Coface/Sinosure)
+ 3 more in PDF
Section 065 items

Safety & Compliance

Worker safety + environmental compliance — table-stakes for ESG-aligned procurement.

☐PPE on factory floor (eye protection, gloves, anti-static)
☐Fire safety + sprinklers + emergency exits unblocked
☐Wastewater treatment / environmental certifications
☐Worker welfare (legal age, hours, dorms, wages)
+ 1 more in PDF
Section 075 items

Logistics & Packaging

How modules are crated + shipped determines arrival quality.

☐Wooden crate packaging (NOT cardboard) — 1.2% vs 5% damage
☐FCL only, never LCL — vibration damage in co-loading
☐All-Risk cargo insurance ≥110% of CIF value per shipment
☐Loading supervised + photo-documented
+ 1 more in PDF
Section 084 items

Commercial Readiness

Payment, lead time, warranty handling — ground truth for the relationship.

☐Payment terms not 100% pre-payment (30/70 reasonable)
☐Lead time documented (2-5 weeks production realistic)
☐Warranty claim process specified in PO
☐Legal jurisdiction: HK/Singapore arbitration preferred
+ 0 more in PDF
Transparency

How does JUSTSOLAR score against this checklist?

Honest answer: 50/50. We built our processes specifically to pass exactly this audit. Verify it yourself — we welcome SGS/TUV/Bureau Veritas at your cost.

SectionScore
Manufacturer Verification8/8 ✓
Production Equipment7/7 ✓
Quality Control Process8/8 ✓
Material Quality6/6 ✓
Documentation & Certs7/7 ✓
Safety & Compliance5/5 ✓
Logistics & Packaging5/5 ✓
Commercial Readiness4/4 ✓
TOTAL50/50
See JUSTSOLAR factory details →

Common questions

Is this checklist really free? What's the catch?
Yes, free. Drop your email and we send the PDF. We use the email to send relevant solar B2B insights ~once a week. Unsubscribe any time. Your address is never shared. We use it to identify if you're a procurement decision-maker — that's it.
Can I use this checklist when auditing JUSTSOLAR ourselves?
Absolutely — that's the point. This checklist works on any solar module manufacturer including us. We score 50/50 because we built our processes to pass exactly this audit. Verify it yourself: book a video factory tour or hire SGS/TUV/Bureau Veritas at your cost. We host inspectors free.
Who built this checklist?
Frank Yang, Director at JUST SOLAR GROUP LIMITED. 14 years supplying modules to 50+ countries — both shipping AND receiving from competitors. The checklist captures the dimensions buyers actually need to verify, not what marketing teams want to highlight.
Does this work for utility-scale 100+ MW projects?
Yes — items 30 (IEC 61215), 36 (insurance-rated bankability letter), and 47 (commercial terms) are critical for project finance. For utility-scale, also request module-level Tier-1 wrap arrangement if your tender requires BNEF Tier-1 strict. We offer this at +$0.01-0.025/W.
Will the PDF link expire or change?
No. Once you download, the PDF is yours. We versioned this as 2026 — we'll release an updated 2027 edition reflecting any new IEC standards or industry changes. Existing 2026 download remains valid.
Can I share this checklist with my team or distribute internally?
Yes — please. Internal team distribution is encouraged. The only thing we ask is don't strip the JUSTSOLAR branding when sharing externally. If you want to white-label for your firm's use with partners, contact frank@jusolar.com.

Related B2B resources

Manufacturing & Factory

2GW capacity · 9-step QC · video tours · audit access

Quality & Compliance

Certifications, QC flow, third-party inspection policy

Bankability & DD Pack

For institutional financing · insurance-rated letters

SGS / TUV / BV Inspection Guide

How to commission third-party PSI

Solar RFP Template

10 sections + 80 items · use with audit checklist

B2B Buyer's Guide

40-page comprehensive procurement guide

Have specific procurement questions?

Director-level direct line. Solar module sourcing across 50+ countries since 2011. We respond within hours.

WhatsApp Frank — +86 177 1730 3786Submit RFQ