Serial-number and warranty tracking for solar panels, inverters and batteries
Warranty claims fail when nobody can prove which unit went where, and when it started. A simple chain from supplier invoice to customer roof, and the minimum fields to capture.
- The chain is supplier invoice, goods receipt, project issue, site installation, commissioning, warranty clock.
- Scan serials twice: at receipt and at installation. The match proves what was installed.
- Warranty starts and terms differ by manufacturer. Record the terms from the documents, not from memory.
- Serial numbers also feed subsidy and commissioning uploads, so capturing them once saves rework.
- A spreadsheet with eight columns beats nothing. Start there.
Quick answer
Capture each component's serial number at goods receipt and again at installation, link it to the project, the customer and the commissioning date, and store the warranty term from the supplier documents. That chain lets you answer three questions in a minute: which unit is on this roof, when did its warranty start and end, and which supplier do we claim from. Start with a scanned serial at receipt and a photo at site.
Why do warranty claims fail?
Usually for a paperwork reason, not a product one. The inverter fails in year three. The customer calls. Someone has to find which inverter it was, which supplier invoice it came from, when it was commissioned and what the warranty term is. If that takes a day of digging through chat photos and old folders, many claims never get filed.
What is the chain to build?
Serial-number chain from supplier to roof
What should you capture per component?
| Component | Capture | Why |
|---|---|---|
| Module | Make, model, wattage, serial, batch if given | Subsidy uploads, performance claims |
| Inverter | Make, model, serial, firmware if relevant | Most frequent claims; links to monitoring |
| Battery | Make, model, serial, capacity | Higher value, stricter handling |
| Meter | Serial, installer, date | Net-metering evidence |
| Structure | Supplier, batch or lot | Corrosion or wind-load disputes |
For each: supplier invoice number, date received, project, site, installed date, warranty term and expiry date, and where the proof (photo, document) is stored.
How do you capture without slowing the crew?
- At receipt: scan the barcode or QR on the carton or unit with a phone and match it to the PO line. Do not retype 200 module serials by hand.
- On site: the installer scans or photographs each inverter and a representative set of modules against the project. A required step in the site checklist, not an optional one.
- At commissioning: the system stamps the warranty start from the commissioning date and calculates expiry from the stored term.
If scanning is not possible yet, take one clear photo of the serial plate per unit, named by project. A folder of correctly named photos is better than none.
How do you use it when a claim arrives?
- Search by customer, site or serial.
- See the unit, the supplier invoice, the commissioning date and the term.
- Generate an evidence pack: invoice, serial photo, commissioning report, fault description.
- Log the claim with the supplier reference and a follow-up date.
- Keep the replacement’s new serial linked to the same site.
Track claims by supplier. Over time you see which supplier’s units fail and how long each takes to respond. That is leverage in the next purchase negotiation.
Why does this tie into compliance work?
Subsidy and commissioning uploads for scheme projects ask for module and inverter details, as described in PM Surya Ghar for EPCs. If serials are captured once at receipt and installation, the upload is a lookup instead of a hunt, and the numbers match across forms.
Where does this not apply?
If you install a handful of systems a year and always keep the paperwork in one folder per customer, a folder structure is enough. Serial tracking becomes worth it when volume grows, when staff change, or when you take on O&M contracts that outlast the people who did the install. See O&M and AMC.
What to do this week
- Build the eight-column sheet and fill it for your next three projects.
- Add serial capture to the site checklist as mandatory.
- For your last five completed jobs, check whether you could produce serial, invoice and commissioning date in five minutes.
Part of the guide Running a solar EPC business on connected systems.
The chain and field list are our own model. The statement that scheme uploads ask for module and inverter serial numbers is from a vendor practitioner guide (SurgePV); check the current portal. Warranty terms and start rules vary by manufacturer and are not stated here.
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