Clarify who carries the product warranty and the performance warranty
Distinguish between the product warranty and the performance warranty: what you are really signing
In the quote and in the technical file, clearly separate the product warranty (material and manufacturing defects, connectors, frame, junction box) from the performance warranty (power degradation over time, often linear). The evidence required is not the same, nor are the processing times. Lock in the exact module reference and the warranty documentation at order stage; this is your contractual document.
Identify the warranty holder according to the channel (specialist wholesaler vs manufacturer) and the stated durations
With a specialist wholesaler, you are buying a service in addition to the box. With direct purchase, you sometimes gain on price, but you often manage the relationship with the manufacturer yourself. A serious solar panel distributor formalises who decides the replacement and who bears the transport cost.
| Channel | Operational warranty holder | Product warranty (years) | Performance warranty (years) |
|---|---|---|---|
| Specialist wholesaler | Wholesaler + manufacturer (depending on contract) | 12 to 25 | 25 to 30 |
| Direct purchase from manufacturer | Manufacturer | 12 to 25 | 25 to 30 |
Anticipate the risk of a supplier disappearing: the real cost of after-sales service
If your contact disappears, the warranty becomes theoretical. Price after-sales support into your margin. Administrative time, RMA, downtime, electrical re-check, and return logistics. Require an EU point of entry or an authorised representative, and a clause covering costs. That is often where the real profitability is decided.
Secure your claims when the manufacturer is outside the European Union
Understand the claims process: evidence to provide, deadlines, logistics, and exchanges
Set out a claims process from the order stage. Build a complete photo file. Serial numbers, labels, pallets, defects, flash test or I-V curve, delivery note, handover report. Specify declaration deadlines, DOA sorting, and return logistics.
Check for a representative or stock in the EU: direct impact on resolution
When the manufacturer is outside the EU, look for an economic operator established in the Union and a buffer stock. Without a local relay, the application of Regulation (EU) 2019/1020 and after-sales processing take longer. A solar panel distributor with EU stock limits downtime and secures exchanges.
Frame responsibilities contractually: credit notes, returns, replacements, and transport
In your terms and conditions or framework agreement, write down who bears the credit note, the replacement, outbound and return transport, packaging, Incoterms, and insurance. Require a written RMA, a sorting procedure, and an advance replacement option when the batch is critical. Provide for the case where the supplier ceases trading. For the administrative side, also see credit notes.
Ensure series availability and lead times that fit your sites
Avoid stockouts: tracking ongoing series and managing end-of-reference situations
Lock in the reference at the quoting stage. Ask for written notice of end of series, a stop date, and an equivalent replacement solution. Reserve an identified batch and keep traceability (reference, batch no., serial no.).
Compare real lead times: wholesaler stock, factory order, transit, and customs clearance
Do not compare an announced lead time. Compare a reliable lead time, with proof of stock at your solar panel distributor. For factory orders, frame the Incoterm, transit, customs clearance, and who bears the risk if there is a blockage.
Manage reference changes during the project: redo the design study and the filing
Any module change means the layout, strings, inverter compatibility, and technical data sheets must be redone. If the declared power or equipment changes, update the grid connection application and file documents. Set an internal rule. No swap without validation.
Calculate the discount and the real margin, beyond the price per peak watt
Identify the volume thresholds that trigger a discount and the associated conditions
On a module purchase, discounts follow logistics thresholds. Check the discount conditions before comparing. Fixed reference, Incoterm, lead time, deposit, claims handling. An announced discount can disappear if the series changes during the project.
| Threshold | Logistics threshold (pallets) | Common trade-off |
|---|---|---|
| Pallet | 1 | Faster payment, depot collection |
| Full truckload | 33 | Strict delivery window, unloading at your expense |
| 40-foot container | 24 | Transport risk, customs, documents to provide |
Factor in storage, breakage, insurance, and cashflow carrying costs in your total cost
The price per Wp does not reflect your total cost. Price in storage, breakage, transport insurance, receiving inspection, cash tied up, and time spent on claims. Bring everything back to kWp, then decide. To frame the immobilisation aspect, you can rely on payment terms.
| Item | Unit | Pricing basis |
|---|---|---|
| Storage | €/pallet/week | Floor space, handling, security |
| Breakage, scrap | % | Provisions based on history |
| Transport insurance | % of value | Depending on Incoterm and coverage |
| Cashflow carrying cost | €/€/month | Deposit, installation lead time, collection |
Choose your model: just-in-time purchases from a solar panel distributor or manufacturer batches
With just-in-time purchasing via a solar panel distributor, you buy availability and an after-sales contact. With manufacturer batches, the discount may improve, but you carry the after-sales risk if the supplier disappears or if the manufacturer is outside the European Union. Change one reference, and you must redo the study and the declaration.
Gather the traceability required for grant files and site handover
Build a solid file: invoices, delivery notes, serial numbers, and data sheets
For a complete file, require dated, nominative documents from your solar panel distributor. Make sure the quote, invoice, and as-built file are consistent.
- Detailed invoice, references, quantities, unit power, batch no. where applicable.
- Delivery notes, pallet labels, proof of receipt.
- List of serial numbers, photos of nameplates before installation.
- Technical data sheets and manufacturer declarations of conformity.
Secure module compliance: exact references, markings, and document consistency
Keep a single module reference for the whole project. If the reference changes, redo the design study, the grid filing, and update the handover file.
- Check the CE marking, exact model, and consistency between labels and technical sheet.
- Verify document consistency with the invoice and signed certificates.
Organise your internal traceability: from pallet arrival to installation, without losing information
Set up a simple document chain. At depot entry, record batch and serial numbers. On site, map the series by area and by inverter. At handover, archive the as-built file and the handover report with photos, as detailed in the handover report and quality control points.
