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JUSTSOLAR — Solar Module Manufacturer
JUSTSOLAR automated solar module production line
Active Production · 2 factories · 3 regions

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.

Book Factory AuditCompany Profile (PDF)
2GW

Annual module capacity

130MW

Monthly throughput

100%

EL-tested modules

<1.2%

In-transit damage rate

Manufacturing Footprint

Three production regions, each with specific market purpose. Full site visits welcome.

🇨🇳Headquarters · R&D · Primary Production

Jiaxing, China

Capacity
~1.6 GW/yr
Lines
2× TOPCon fully automated (182mm + 210mm) · 1× HJT dual-glass
Products
TOPCon 600W / 640W / 730W · HJT 730W
Audit Access
Open for video call + in-person audit (with notice)
Certifications
ISO 9001:2015 · ISO 14001 · ISO 45001
🇲🇰EU-Origin Production · EPC Base

Skopje, Macedonia

Capacity
~300 MW/yr
Lines
1× TOPCon automated · assembly + QA
Products
TOPCon 600W / 640W (EU-origin for CBAM)
Audit Access
Factory visits welcomed — 1 hour from Skopje airport
Certifications
ISO 9001 · EU-origin Certificate of Origin available
🇻🇳Contract Manufacturing · US Market Access

Southeast Asia (OEM)

Capacity
~100 MW/yr allocation
Lines
Partner facility · JUSTSOLAR spec + IP
Products
TOPCon 600W / 640W (non-China origin)
Audit Access
Case-by-case, subject to partner NDA
Certifications
UL 61730 / UL 61215 ready · IEC 61215 / 61730

9-Step Production Process

From cell to container — every module passes the same 9-stage sequence with defined KPIs at each checkpoint.

01
100% cells IV-sorted

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.

02
<0.05% stringing reject rate

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.

03
POE encapsulant for HJT (anti-PID)

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.

04
≥85% EVA cross-linking target

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.

05
100% EL — every pallet, every module

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.

06
Frame pull-out ≥2400N (IEC)

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.

07
Positive power tolerance only

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.

08
No rework policy — fail = scrap

Hi-Pot + Insulation Test

Wet leakage test (IEC 61730-2). Insulation resistance ≥400 MΩ·m² verified. Modules failing reject immediately, not re-tested.

09
<1.2% in-transit damage rate

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.

EquipmentCountBrand / Spec
String Welding6 linesAutowell / 晶盛
Layup + Lamination8 stationsYAC / GP Solar
EL Inspection12 camerasBrightEye / 宏远
Flash Testing8 sun simulatorsPasan / Spire class A+A+A+
Frame Presses6G.A. Fastening / Autowell
Automated Loaders12ABB / KUKA robotic arms

Inside the Line

Real images from our Jiaxing production floor — not stock photos. For live tour, book a video call.

Robotic module assembly

Robotic module assembly

Cell stringing cleanroom

Cell stringing cleanroom

Quality control inspection

Quality control inspection

Automated production arm

Automated production arm

Full line overview

Full line overview

Headquarters + BIPV facade

Headquarters + BIPV facade

Manufacturing FAQ

Are you a real manufacturer or a trader rebadging somebody else's panels?
Manufacturer. We operate our own fully-automated TOPCon and HJT lines in Jiaxing, China, with an EU-origin line in Skopje, Macedonia. We welcome video factory tours on WhatsApp/WeChat/Zoom with 24-hour notice, and in-person audits any time. SGS, TUV, or Bureau Veritas can conduct pre-shipment or DDQ factory audits at your cost — we facilitate.
What's the realistic monthly capacity I can book?
Our China factory runs ~130 MW/month across TOPCon lines. Macedonia adds ~25 MW/month. Typical lead times: in-stock items 5–10 days, production build 2–5 weeks depending on spec and queue. For 20 MW+ orders we block line time in advance; send a firm PO + deposit and we schedule the exact production week.
Can you manufacture against OEM specs or private-label for a distributor?
Yes. Minimum OEM run is 50 MW (custom frame color, junction box spec, or label). Private-label (your brand name on the module label) is possible at any volume — we supply the engineering drawings and you approve. All OEM/private-label modules remain TUV and IEC certified under our factory's certification scope.
Do you accept third-party inspection and at whose cost?
We always welcome SGS, TUV Rheinland, Bureau Veritas, Intertek, or any agency of your choice. Pre-shipment inspection (PSI) is standard — you book and pay the agency directly, we host for free. Common scope: AQL 2.5 visual sampling, EL re-test spot check, flash test verification, packaging inspection. For utility-scale (20 MW+) we can host a residency inspector for the entire production run.
What equipment brand are your production lines using?
Stringing: Autowell and 晶盛 (Crystal Growth) — both industry standard for TOPCon. Lamination: YAC (Japan) and GP Solar (Germany). Sun simulators for flash testing: Pasan (Swiss) class A+A+A+ — the best available. EL cameras: BrightEye. Framing presses: G.A. Fastening. Loader arms: ABB and KUKA robotics. Full equipment list with serial numbers available under NDA.
What's your in-transit damage rate vs industry?
Under 1.2% vs industry average 3–5%. We use wooden-crate packaging (not cardboard), EPE foam corner protectors, FCL-only (no LCL), and All-Risk cargo insurance on every container. We supervise loading — most competitors rely on freight forwarder. If damage occurs, we handle the insurance claim paperwork for you.

Complete your due diligence

Quality & Compliance

Certifications, QC flow, third-party inspection policy

Warranty Center

25-year product + 30-year linear performance

Downloads & Compliance Pack

Datasheets, certificates, warranty docs, company profile

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.

Book Video Factory TourRequest Factory Audit Report