| 1. Product Identity and Electrical Specification |
| Module technology |
Cell architecture, cell count, module type, glass configuration, frame material, and whether the module is monofacial or bifacial. |
Commercial modules commonly use mono-crystalline silicon cells. Large-format modules may use approximately 108, 120, 132, 144, or 156 half-cells, depending on design. |
Final datasheet, product drawing, bill of materials, packing list, and photographs of the nameplate. |
Confirm that the quoted model number is identical across the quotation, datasheet, test reports, warranty, and shipping documents. |
“Equivalent model” without written approval. |
| Rated power |
Rated maximum power in watts, power tolerance, and test condition. |
Utility and commercial rooftop modules are commonly quoted in the approximate 400–700 W range, depending on module size and technology. |
Datasheet showing Pmax, tolerance, STC values, and test laboratory information. |
Compare power rating only after confirming module dimensions, voltage, current, and temperature coefficients. |
High wattage based only on a larger physical footprint. |
| Efficiency |
Module efficiency, measurement tolerance, and applicable test conditions. |
Many current mass-market crystalline-silicon modules are approximately 19%–24% efficient; the value depends on cell design and module format. |
Current datasheet and independent test report, where available. |
Calculate efficiency as rated power divided by module area; do not compare unlike module sizes. |
Efficiency advertised without rated power or dimensions. |
| Electrical operating values |
Open-circuit voltage, short-circuit current, maximum-power voltage, maximum-power current, and temperature coefficients. |
Values vary materially by design. Modern large-format modules may have operating currents above 13 A, so inverter and cable compatibility must be checked. |
Datasheet, string-sizing calculation, and inverter compatibility confirmation. |
Check maximum system voltage, maximum series fuse rating, cold-weather Voc, and inverter input-current limits. |
Only the wattage is supplied; current and voltage are omitted. |
| Mechanical dimensions and mass |
Length, width, thickness, weight, mounting-hole pattern, and allowable clamp zones. |
Large modules commonly exceed 2 m in length and may weigh approximately 20–40 kg; the exact values must be confirmed for logistics and structural design. |
Dimension drawing, installation manual, and certified mechanical-load data. |
Verify roof access, pallet handling, container loading, rail spacing, and local structural-load limits. |
Dimensions differ between the quote and the installation manual. |
| 2. Warranty and Long-Term Performance Verification |
| Product warranty |
Warranty duration, covered defects, remedy, exclusions, claim procedure, governing law, and responsible legal entity. |
Product warranty periods of 12–25 years are commonly offered in the market. A stated 25-year period must be verified in the actual warranty document. |
Signed warranty PDF, legal-entity details, sales contract, and service-contact procedure. |
Confirm whether the term starts at shipment, delivery, commissioning, or another date, and whether labor, transport, removal, and reinstallation are covered. |
Marketing page says 25 years, but the contract states a shorter period. |
| Linear performance warranty |
Guaranteed power at year 1 and the final warranty year, annual degradation rate, and measurement method. |
Common structures include approximately 98%–99% of initial power after year 1, followed by about 0.25%–0.55% annual degradation. A 30-year term is not automatically better than a 25-year term. |
Warranty curve, tolerance definition, test method, and claim threshold. |
Calculate the implied final guaranteed power and confirm whether the guarantee applies to nameplate power or measured power. |
Only “up to 30 years” is stated without a degradation curve. |
| Warranty enforceability |
Legal manufacturer or guarantor, claim jurisdiction, financial-security provisions, replacement policy, and transferability. |
Warranty length has limited value if the responsible entity, claim route, and replacement obligations are unclear. |
Executed warranty, company registration details, authorized signatory, and dispute-resolution clause. |
Match the contracting seller, invoice issuer, warranty issuer, and exporter; identify any assignment or transfer conditions. |
Warranty issuer is unnamed or different from the contracting party. |
| 3. IEC Standards, Testing, and Compliance |
| Design qualification and type approval |
Applicable design-qualification standard and the tested module construction. |
IEC 61215 is commonly used for terrestrial photovoltaic module design qualification and type approval. |
Complete test report identifying the exact model, construction, revision, laboratory, and test dates. |
Confirm that the report covers the quoted bill of materials and is not limited to a different product family. |
Only an IEC logo or certificate summary is supplied. |
| Safety qualification |
Electrical safety standard, module class, maximum system voltage, and applicable national requirements. |
IEC 61730 is the principal photovoltaic module safety qualification standard, covering construction and safety testing. |
IEC 61730 test report or valid certification record from a competent conformity-assessment body. |
Check whether the certification applies to the exact module type, voltage class, materials, and production site. |
Safety claims are based only on a factory declaration. |
| Environmental testing |
Resistance to salt mist, ammonia, dust and sand, damp heat, humidity-freeze, and potential-induced degradation where relevant. |
IEC 61701 addresses salt-mist corrosion testing; IEC 62716 addresses ammonia corrosion testing; IEC 60068-2-68 is used for dust and sand testing in applicable programs; IEC 62804 addresses PID testing. |
Full reports, test severity level, sample configuration, pass/fail criteria, and laboratory accreditation. |
Match the environmental test level to the project location, such as coastal, agricultural, desert, or high-humidity conditions. |
“Suitable for coastal use” without a test level or report. |
| Factory quality system |
Production-site quality controls, incoming-material inspection, electroluminescence testing, flash testing, traceability, and nonconformance handling. |
IEC 62941 provides a quality-system guideline for photovoltaic module manufacturing and is useful for evaluating production consistency. |
Factory audit report, process-control plan, sample EL images, flash-test records, and serial-number traceability procedure. |
Request a pre-shipment inspection and randomly select serial numbers for document matching. |
Inspection is restricted to visual appearance and carton count. |
| Installation and commissioning documentation |
Installation manual, connector compatibility rules, grounding instructions, torque values, clamp zones, and commissioning tests. |
IEC 62446-1 is commonly referenced for grid-connected photovoltaic system documentation, commissioning tests, and inspection records. |
Installation manual, commissioning checklist, insulation-resistance results, polarity checks, and IV-curve records where required. |
Confirm local electrical-code requirements and require a final as-built record set. |
No installation manual is available before purchase. |
| 4. Commercial Quote and Incoterms® 2020 |
| Price basis |
Currency, unit price, total price, tax treatment, validity period, payment schedule, and included accessories. |
Quotes should state whether pricing is per module, watt, pallet, container, or complete system, with currency and tax treatment clearly defined. |
Formal pro forma invoice, quotation revision number, packing assumptions, and payment instructions. |
Normalize all offers to cost per watt and total landed cost, including inspection, freight, insurance, duties, taxes, and local delivery. |
A low unit price excludes major logistics or compliance costs. |
| EXW / FCA |
Named place, handover point, export-clearance responsibility, and loading responsibility. |
EXW places most transport and export obligations on the buyer. FCA generally assigns export clearance to the seller and can be clearer for containerized shipments. |
Quotation stating “EXW” or “FCA” plus the exact named place under Incoterms® 2020. |
Confirm who loads the goods, clears export customs, books the main carriage, and bears risk at handover. |
“FOB factory” or “FCA port” is used without a precise named place. |
| FOB / CFR / CIF |
Named port of shipment or destination, freight inclusion, insurance scope, and risk-transfer point. |
Under FOB, the seller delivers on board at the shipment port. Under CFR, the seller pays freight to the destination port but risk transfers at shipment. Under CIF, the seller also arranges minimum contractual cargo insurance. |
Quotation using the exact format, such as “FOB [named port], Incoterms® 2020,” plus freight and insurance terms. |
Do not confuse who pays freight with who bears transit risk. Review insurance coverage, deductible, exclusions, and claims process. |
“CIF delivered” is presented as door delivery. |
| DAP / DPU / DDP |
Exact delivery address, unloading responsibility, import-clearance responsibility, duties, taxes, and local compliance. |
DAP generally leaves unloading and import clearance to the buyer. DPU includes unloading at the named place. DDP places import clearance, duties, and taxes on the seller, subject to legal feasibility. |
Door-delivery quotation with named place, tax assumptions, customs broker, unloading scope, and proof of import responsibility. |
Check whether the seller can legally act as importer of record and whether local VAT, sales tax, duties, and permits are included. |
“DDP” is quoted without confirming importer-of-record capability. |
| Risk and title transfer |
Risk-transfer point, title-transfer point, payment milestone, and acceptance criteria. |
Incoterms® define delivery obligations and risk allocation, but they do not by themselves determine title transfer, payment terms, or product warranty. |
Sales contract, Incoterms® 2020 clause, inspection clause, and title-retention language. |
Align the Incoterm with marine insurance, cargo inspection, payment release, and damage-claim procedures. |
The quote treats Incoterms® as a substitute for a complete sales contract. |
| 5. Logistics, Inspection, and Contract Controls |
| Packing and container loading |
Modules per carton, cartons per pallet, pallets per container, gross weight, dimensions, and packaging materials. |
Loading quantity varies with module dimensions, pallet design, legal road weight, and carrier limits; it must be confirmed rather than assumed. |
Approved packing list, pallet drawings, container-loading plan, and gross/net weight declaration. |
Check container payload, pallet stability, moisture protection, corner protection, and unloading equipment at destination. |
Container quantity is stated without a packing list. |
| Pre-shipment inspection |
Inspection scope, sampling plan, acceptance criteria, timing, and remedy for nonconformity. |
A buyer may require visual inspection, packaging verification, serial-number reconciliation, EL testing, flash-test review, and document verification before final payment. |
Independent inspection report, sample-selection record, EL images, flash lists, and corrective-action report. |
Define rejection thresholds and payment holdback before production begins. |
Inspection is allowed only after shipment. |
| Traceability |
Serial-number format, production date, factory location, batch number, raw-material traceability, and digital records. |
Every delivered module should be traceable to its production batch and supporting flash-test and EL records. |
Serial-number list, barcode file, production records, and certificate-to-model cross-reference. |
Randomly select cartons and modules and verify that serial numbers match the invoice, packing list, datasheet, and test records. |
Serial numbers are unavailable until after delivery. |
| Payment protection |
Deposit, production milestone, inspection milestone, balance payment, letter of credit or escrow option, and refund terms. |
Payment structure should link the final balance to document approval and successful pre-shipment inspection rather than shipment alone. |
Signed payment schedule, bank-account verification, inspection clause, and nonconformity remedy. |
Verify bank details through an independent channel and avoid changing payment instructions based solely on email. |
Full prepayment is required before technical documents are released. |
| Contract acceptance criteria |
Exact model, rated power, tolerance, dimensions, warranty documents, standards, delivery schedule, and liquidated damages. |
The signed contract should incorporate the final datasheet, approved sample, packing specification, inspection plan, and warranty as controlled attachments. |
Purchase contract with revision-controlled technical annexes and a document hierarchy clause. |
State that the signed contract and approved annexes prevail over informal quotations, marketing materials, or verbal promises. |
The contract contains no model number, test standard, or acceptance criteria. |
