PROCUREMENT NOTES
Equipment trials, FAT and SAT for PV manufacturing equipment
Turn a supplier demonstration into a test that proves the machine on your materials, at your rate, with your acceptance rules.
By PVYard Editorial · Updated 2026-11-06
Why the trial plan comes before the price
Most PV equipment listings describe what a machine is designed to do. Very few describe how that performance was measured. A trial and acceptance plan closes that gap. It states which material is used, which result counts as good output, how long the run lasts and who signs the record. Without it, a quotation compares headline numbers that were produced under different conditions.
IEC 62381 is written for automation systems in the process industries, not for solar equipment, but its structure is useful. It separates the factory acceptance test (FAT), an optional factory integration test, the site acceptance test (SAT) and the site integration test, and its purpose is to let owner, buyer and vendor agree the scope and responsibilities of each test in advance. That division maps well onto a PV line, where a single station is often accepted at the builder's factory and the complete line is only proven after installation.
Sample trials: prove the process on your material
A sample trial answers a narrower question than FAT: can this equipment produce an acceptable result on the buyer's own wafers, cells, glass or encapsulant? It is most useful before the configuration is frozen. For a cell stringer, that means real cells of the intended thickness, ribbon and busbar pattern, with the joint and breakage criteria written down before the run. For deposition systems, it means agreed film measurements and positions on the buyer's wafer route rather than a demonstration on the supplier's standard substrate.
Our listings keep what a supplier publishes apart from what a trial should show. The Hongsheng PV connector assembly machine page, for example, asks the supplier to show, with genuine incoming parts, how the machine detects faults, how much good output it delivers, how it changes between variants and how it exchanges data with the MES. The NAURA HORIS L12 LPCVD page makes the same point for films and consumable life under traceable conditions. A trial that skips these items gives you a pleasant video and nothing you can sign off against.
Factory acceptance: what to witness before shipment
FAT is the last point at which changes are cheap. The buyer should know where it takes place, which configuration is tested and what happens to any open items. Several manufacturer profiles in this directory leave the FAT location open; the NAURA and Yiheng profiles both recommend confirming the producing legal entity and the actual FAT site during supplier review.
A useful FAT protocol lists the material quantity, the run length, the measured outputs and the fault scenarios. Fault scenarios matter as much as good output. For the Benlong DC isolator production line, the listing proposes deliberately creating four faults in a controlled way: a missing part, a failed electrical test, a duplicate identifier and a lost MES link. For a module laminator, the equivalent checks are the full cycle including loading, both chambers, unloading and cleaning, which is how our Yiheng single-level two-chamber laminator listing frames the timed run.
Site acceptance: the line as it really runs
SAT repeats part of FAT after transport and installation, then adds the connections that could not exist at the builder's factory: upstream and downstream transfers, the buyer's utilities and the factory software. The HORAD custom module line offering is a good example of why this matters; its page advises specifying approved samples, measured module results and witnessed FAT and SAT records, because an integrated line is only proven once the stations run together.
Delivery schedules should show SAT as its own step. The Benlong profile notes a 90–120 day standard-delivery statement that sits next to separate durations for design, layout, manufacture, installation and SAT. Line those figures up before signing, so that "delivery" and "accepted at site" do not get confused.
Measuring time and output consistently
Acceptance runs need agreed definitions of uptime, downtime and good output. SEMI E10 provides a common vocabulary for equipment reliability, availability, maintainability and utilization, including mutually exclusive equipment states such as productive, standby, engineering and scheduled or unscheduled downtime. Referring to those definitions in the contract avoids arguments about whether a jam, a recipe change or a material shortage counts against the machine.
For module manufacturers, IEC 62941 adds a quality-system view: identification, traceability, validation of processes and control of measuring equipment, on top of an ISO 9001 system. A FAT record that names the calibrated instruments and the material lots used is easier to defend later than a summary sheet.
A practical acceptance file
Before ordering, agree a short file that both sides keep: the configuration drawing and revision, the trial material and its lot identity, the measured results and positions, the fault scenarios tested, the open items with owners and dates, and the signatures for FAT and SAT. Use the module assembly, cell production or wafer processing stage pages to find the equipment classes involved in your line, and check each listing's "Confirm before ordering" list for items to add to the protocol. Our laminator buying guide shows how this works for one equipment class.
Sources
- webstore.iec.ch — source document
- webstore.iec.ch — source document
- store-us.semi.org — source document
Manufacturer specifications are source statements. Confirm configuration and acceptance conditions with the supplier. Our editorial standards
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