Own factories, not a trader.
2 GW TOPCon + HJT production.
We manufacture what we sell. Fully automated TOPCon and HJT lines in Jiaxing (China) and Skopje (Macedonia), plus Southeast Asia contract manufacturing for US-market access. Video + in-person factory audits always welcome — book a call and see the line run live.
Annual module capacity
Monthly throughput
EL-tested modules
In-transit damage rate
Manufacturing Footprint
Three production regions, each with specific market purpose. Full site visits welcome.
Jiaxing, China
Skopje, Macedonia
Southeast Asia (OEM)
9-Step Production Process
From cell to container — every module passes the same 9-stage sequence with defined KPIs at each checkpoint.
Cell Incoming Inspection
N-type TOPCon / HJT cells inspected by IV curve binning, visual defect sort, electrical classification. Only binned cells above tolerance enter stringing.
Automated Cell Stringing
Robotic stringing with infrared soldering or busbar-free gluing (HJT). Tab-ribbon tension and alignment optically verified in-line. Cold-joint rejects auto-ejected.
Layup + EVA/POE Encapsulation
Glass → encapsulant → string matrix → encapsulant → backsheet/glass (dual-glass) stacked under laminar flow. Automated string placement with ±0.3mm XY tolerance.
Vacuum Lamination
14-minute cure cycle at 148°C under vacuum. Edge voids and bubbles automatically detected post-lamination. Cross-linking degree verified by inline monitor.
EL Testing (100%)
Every single module passes electroluminescence imaging to detect micro-cracks, cold joints, broken fingers, and cell mismatches invisible to the naked eye. EL images archived with serial number.
Framing + Junction Box
Anodized aluminum frames (6063-T5 or 6005-T6) pressed on with silicone sealant. IP68 junction box laser-welded. Diode thermal test before next stage.
Flash Test + Power Binning
Every module flash-tested under STC (1000 W/m², AM1.5, 25°C). IV curve recorded with module SN. Power tolerance 0 / +5W positive-only sort. Flash list included with every shipment.
Hi-Pot + Insulation Test
Wet leakage test (IEC 61730-2). Insulation resistance ≥400 MΩ·m² verified. Modules failing reject immediately, not re-tested.
Packaging + Loading Supervision
Wooden-crate packaging with EPE foam corner protection. Pallets stretch-wrapped. Loading supervised — bracing, securing, desiccant placement all checked before container sealing.
Production Equipment
Tier-1 equipment brands — same lines used by BNEF Tier-1 manufacturers. Full serial-numbered equipment list under NDA.
| Equipment | Count | Brand / Spec |
|---|---|---|
| String Welding | 6 lines | Autowell / 晶盛 |
| Layup + Lamination | 8 stations | YAC / GP Solar |
| EL Inspection | 12 cameras | BrightEye / 宏远 |
| Flash Testing | 8 sun simulators | Pasan / Spire class A+A+A+ |
| Frame Presses | 6 | G.A. Fastening / Autowell |
| Automated Loaders | 12 | ABB / KUKA robotic arms |
Our lines also produce for BNEF Tier-1 brands.
Beyond supplying the JUSTSOLAR brand, our Jiaxing production lines also manufacture finished modules under NDA for brands listed on the BNEF Tier-1 index. This means the equipment, the QC protocols, the engineering team, and the supply chain that make your JUSTSOLAR-brand modules are the same ones that meet the industry's most demanding quality gates.
For buyers whose projects require BNEF Tier-1 bankability (utility PPAs with institutional financing, government tenders), we can also supply under a Tier-1 wrap arrangement. For everyone else, our own certifications and warranty are equivalent — without the brand premium.
Inside the Line
Real images from our Jiaxing production floor — no stock photos. For a live tour, book a video call.
Production floor — main TOPCon line
Stringing & cell handling
Layup & lamination station
EL inspection bay
Frame & junction-box assembly
Flash-test & binning
Final QC & packaging
Full line overview
Solar Module Factory Audit Checklist 2026
50-point B2B buyer's checklist for solar module factory audits. Use during pre-shipment inspections, factory visits, or supplier qualification. 8 sections: Manufacturer Verification · Production Equipment · QC Process · Material Quality · Documentation & Certs · Safety · Logistics · Commercial Readiness.
Manufacturing FAQ
Are you a real manufacturer or a trader rebadging somebody else's panels?
What's the realistic monthly capacity I can book?
Can you manufacture against OEM specs or private-label for a distributor?
Do you accept third-party inspection and at whose cost?
What equipment brand are your production lines using?
What's your in-transit damage rate vs industry?
Complete your due diligence
Quality & Compliance
Certifications, QC flow, third-party inspection policy
3rd-Party Inspection Guide
SGS vs TUV vs BV vs Intertek — scope, cost, what they catch
Warranty Center
25-year product + 30-year linear performance
Downloads & Compliance Pack
Datasheets, certificates, warranty docs, company profile
Latest from our Jiaxing factory floor and the wider solar industry — see our News & Insights feed for technology updates and shipping advisories.
See the line in action
Book a 20-minute video walk-through — we open the factory floor on a live WhatsApp/Zoom call and answer any technical question on the spot. Due diligence packs, equipment lists, and production schedules available under NDA.