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-grade equipment and production discipline. Our lines also support NDA-protected BNEF Tier-1 OEM programs, with full serial-numbered equipment list available 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 strict NDA for brands listed on the BNEF Tier-1 index. We do not disclose those brand names publicly. This means the equipment, QC protocols, engineering team and supply chain behind your JUSTSOLAR-brand modules have already worked under demanding OEM 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, direct JUSTSOLAR supply keeps the QC records, documentation and warranty support while reducing the retail 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.