Supply Chain Transparency
Every component, sourced and traced.
Utility-scale buyers, ESG-mandated procurement, and bankability due-diligence teams need to know exactly where every gram of silicon, every pane of glass, and every cell comes from. This page is our full bill-of-materials disclosure — plus Xinjiang-free, CBAM-ready, and non-China-origin options.
Bill of Materials Traceability
Every component tier from upstream polysilicon to finished module, with primary sources, alternates for special compliance, and traceability method.
| Component | Primary source | Alternate / Compliance option | Traceability |
|---|---|---|---|
Polysilicon Upstream ISO 14001 refining partners | Approved upstream producers under our qualified supplier system | Xinjiang-free and imported-origin pathways available for compliance-driven buyers | Polysilicon lot numbers traceable to refining plant and batch. Supplier identities and cost impact are shared only under NDA and PO-stage review. |
Silicon Wafers Wafer SEMI M1 / M44 standards | Qualified wafer partners for 182mm and 210mm N-type formats | Non-China wafers (Vietnam, Taiwan, Korea) available for US-destined or Xinjiang-free projects | Wafer lot ID stamped on string sub-assembly. Traceable back to ingot grower + wafer slicer by LOT-YYWW-XXX format. |
Solar Cells Cell IEC 60904 classification | Qualified TOPCon N-type and HJT cell supply through approved internal and partner channels | Southeast Asia cells (via SE Asia assembly partnership) for US anti-dumping avoidance | Cell batch IV-curve binned on arrival. Serial-numbered cell-to-module mapping retained for 10+ years. |
Solar Glass (front) Module BOM EN 12150 / ASTM C1048 tempering | Qualified tempered and anti-reflective coated solar glass suppliers | Italian or Turkish glass on request for EU-origin compliance | Glass batch tied to lamination lot. Anti-glare / anti-reflective coating verified via in-line optical inspection. |
EVA / POE Encapsulant Module BOM IEC 61215 damp-heat 1000h validated | Qualified EVA and POE encapsulant suppliers matched to product family | — | Roll lot numbers tracked to lamination station + module SN. Cross-linking degree verified post-cure. |
Backsheet / Rear Glass (dual-glass) Module BOM UL 1703 fire classification | Dual-glass or qualified backsheet supply matched to module design | — | Backsheet roll lot tied to module SN. For dual-glass, rear tempering performed to same spec as front. |
Junction Box + Diodes Module BOM IEC 62790 J-box standard | Qualified IP68 junction box and diode suppliers | — | J-box lot number bonded to module frame. Bypass diode thermal stress test pre-installation. |
Aluminum Frame Module BOM IEC 61215 mechanical loading 5400 Pa | 6063-T5 or 6005-T6 anodized aluminum from qualified extrusion suppliers | — | Alloy composition certified per batch. Anodization layer ≥15 μm verified. |
Interconnect Ribbon Module BOM IEC 61189 solderability | Qualified tin-coated copper interconnect ribbon suppliers | — | Ribbon spec (thickness, width) matched to cell bus-bar count. Pb-free option available. |
Supplier-specific identification (company names beyond tier) available under NDA with PO commitment.
ESG & Compliance Policies
What we commit to, what we audit, and what documentation we provide.
Xinjiang-Free Supply Chain Option
For buyers with US UFLPA or EU due-diligence requirements: we offer a Xinjiang-free pathway with documentation reviewed under NDA. Cost impact depends on routing, volume and timing, and is confirmed only in a formal quote.
No Forced Labor
JUSTSOLAR and our supplier network comply with ILO fundamental conventions on forced labor, child labor, and freedom of association. Supplier audits conducted annually; non-compliance results in contract termination.
Environmental Management
Our production facilities are ISO 14001 certified. Target >30% renewable electricity for our own manufacturing by 2027 (on track with on-site rooftop solar + grid PPA). Water recycling at ingot-to-wafer partners monitored.
Conflict Minerals
We follow OECD Due Diligence Guidance for Responsible Supply Chains. Tantalum, tin, tungsten, gold (3TG) in junction boxes sourced via smelter-audited suppliers (RMI-aligned).
Carbon Footprint Disclosure
Module-level carbon footprint data available on request: currently 380–420 kgCO₂eq/kWp for China-made modules, 240–280 kgCO₂eq/kWp for Macedonia EU-origin modules. CBAM-ready documentation for EU imports.
Supplier Code of Conduct
All tier-1 and tier-2 suppliers sign our Supplier Code of Conduct covering labor, environment, ethics, and management systems. Available on request under NDA.
Xinjiang-Free / UFLPA-Compliant Option
For US buyers (UFLPA), EU utility PPAs with ESG due diligence, and corporate buyers with supply-chain mandates: we offer a fully Xinjiang-free module pathway.
Also available: Macedonia EU-origin modules (CBAM-compliant, lower carbon footprint) and Southeast Asia-origin modules (AD/CVD avoidance for US market). Talk to us about routing.
Our lines already supply BNEF Tier-1 brands
Under NDA, we manufacture finished modules for brands listed on the BNEF Tier-1 index. The same supply chain, QC, and equipment that ships JUSTSOLAR-brand modules also ships under Tier-1 labels. This is the strongest third-party validation of our manufacturing capability — and the basis for offering Tier-1 wrap arrangements to bankability-required projects.
Supply Chain FAQ
Can JUSTSOLAR provide a Xinjiang-free supply chain?
What is a Chain of Custody (CoC) document and can you provide one?
What's the module carbon footprint for CBAM / PPA disclosures?
How does JUSTSOLAR handle supplier audits?
Do you offer non-China-origin modules for USA market?
What documentation is in a bankability / DD pack for utility projects?
Request a Supply Chain / Compliance Pack
Tell us your project's ESG mandate — UFLPA, CBAM, corporate ESG, BNEF Tier-1 — and we'll send you the exact documentation you need. For 25 MW+ orders, Chain of Custody is included at no charge.