What are B-grade and refurbished solar panels in Pakistan?

B-grade panels are factory rejects that failed quality control due to micro-cracks, uneven cell busbars, or low electrical insulation resistance. Unscrupulous traders in Pakistan import these at heavy discounts, affix counterfeit Grade-A stickers, and sell them at slightly reduced prices. They degrade rapidly and lose 20–40% output within 2–3 years.

What is a solar flash test report?

A flash test report is a laboratory test sheet generated during factory manufacturing using simulated sunlight. It shows the exact maximum power (Pmax), open circuit voltage (Voc), short circuit current (Isc), and fill factor (FF) for each specific serial numbered panel.

Buyer Protection

How to Check Original Solar Panels in Pakistan 2026: Avoid Counterfeits & B-Grade

Q: How can I verify if a Jinko or LONGi solar panel is original in Pakistan?

Locate the QR code embedded under the front glass at the top corner of the module. Open the official verification portal on your smartphone (e.g., Jinko Solar Customer Portal or LONGi Verification App) and scan the code. Authentic panels will instantly return the factory production date, wattage, flash test curve, and unique serial number matching the outer frame barcode.

By PSI Editorial · 8 min read · Updated September 2026

Scanning QR code under glass to verify original solar panels in Pakistan — PakSolarInsights

Atomic Summary: Buying counterfeit or B-grade solar panels in Pakistan can reduce your system's power generation by 30% and void your 25-year warranty. Always verify the internal QR code laminated inside the front tempered glass, match the frame serial barcode with the flash test report, check for clean silicone corner seals, and insist on sales tax invoices from AEDB-authorized distributors.

The 5-Step Verification Checklist for Pakistani Buyers

1. The In-Glass Laminated QR Code Test

Every genuine Tier-1 manufacturer (Jinko, LONGi, Canadian Solar, Trina, JA Solar) laminates a high-resolution QR code directly under the front tempered glass during cell encapsulation. If the QR code is a sticker glued on top of the glass or can be scraped off with a fingernail, the panel is 100% counterfeit or relabeled.

2. Official Manufacturer Portal Scan

Use your phone browser to visit the official brand verification page:

Jinko Solar: Scan via the official Jinko Global Verification Portal (returns exact serial number, wattage, and factory date).
LONGi Solar: Scan using the LONGi Solar Product Authentication app.
Canadian Solar: Cross-check serial number on Canadian Solar warranty portal.

3. Physical Inspection of Busbars & Cells

Hold the panel in daylight and examine the silicon cells closely:

Cell Colour Uniformity: Grade-A monocrystalline cells have a uniform, deep black/dark blue shade. B-grade panels have blotchy, rainbow, or mismatched cell shades.
Busbar Alignment: The silver ribbon conductors (busbars) must be perfectly straight with zero wavy lines or stray solder drops.
Silicon Corner Glue: Inspect the junction between the aluminium frame and glass. Authentic panels have machine-applied, spotless silicone sealant without messy overflows or gaps.

4. Matching Barcode on Frame and Junction Box

The barcode etched on the side aluminium frame must match the barcode inside the front glass and the barcode sticker on the rear IP68 junction box. If any number differs by even one digit, the module is a relabeled reject.

Frequently Asked Questions

How can I verify if a Jinko or LONGi solar panel is original in Pakistan?

Scan the internal QR code located under the top corner of the front glass through the manufacturer's official verification portal. It will confirm model specifications and warranty status.

What is the risk of buying B-grade solar panels?

B-grade panels suffer from high internal resistance, hot-spot generation, rapid degradation (losing up to 40% generation in 3 years), and have zero manufacturer warranty support.