How to Verify an Original Longi Solar Panel

Can you check whether your Longi panel is original before you pay for it? Yes — and it takes about two minutes. Every genuine Longi panel carries a unique QR code and serial number on its nameplate. Scan the QR code with your phone, or type the serial number into LONGi’s official Module Authenticity page on longi.com. If the panel is genuine, the page shows its model, specifications and warranty details. If the code is not found, do not pay. This guide shows you how to verify original Longi solar panel stock step by step, what to check on the label and the box, and the red flags that mean you should walk away.

Why Fake Longi Panels Are a Problem in Pakistan

Longi is one of the most popular solar panel brands in Pakistan. That popularity has a downside: its name is misused to sell substandard panels, and LONGi itself has publicly warned about counterfeit modules carrying its name.A fake or relabelled panel can look almost identical to the real thing. The frame, the glass and the cells all look right at a glance. The difference shows up later — lower output than promised, cells that fail early, and no manufacturer warranty when something goes wrong. A panel that cannot be verified is a panel you cannot trust, however good the deal sounds.The good news is that verification is free and fast. LONGi built the check into every panel it makes, and you can run it yourself with nothing more than a phone — before you pay, and again when the panels are delivered.

What You Need Before You Start

You need three things, and none of them costs anything:

• The panel itself, or its serial number. The serial number sits on the label on the back of the panel, near the junction box. The same number is also laser-etched under the front glass, near the edge of the frame. Ask the dealer for the full serial-number list with your quotation, before you pay anything.
• A phone with a camera and internet. You will either scan the QR code on the nameplate or type the serial number into LONGi’s website.
• The panel’s paperwork. Ask for the flash test report for each panel and the purchase invoice. The flash test report is the factory sheet that records the panel’s measured output. Its serial number and wattage must match the panel in front of you.

Method 1: Scan the QR Code on the Nameplate

This is the fastest check, and the one LONGi itself recommends. Under its One Module One Code system, every module carries a unique anti-counterfeiting QR code on its nameplate — no two genuine panels share the same code.Here is how to use it:

1. Turn the panel over and find the nameplate label on the back. The QR code is printed on it.
2. Open your phone camera and point it at the code. Your phone’s own camera is enough — do not use a random QR app from an advertisement.
3. Tap the link that appears. Check the address bar first: it must open on longi.com, LONGi’s own website. If the scan opens any other website, stop — the code has been tampered with.
4. Read the product page that opens. It shows the module type and level, product certification, electrical parameters, product specification and warranty details for that exact panel.
5. Compare what the page shows with the label on the panel and with your quotation. The model name, wattage and serial number must all match.

If the QR code is missing, scratched off, or printed on a sticker that peels away easily, treat that as a warning sign. Genuine LONGi nameplates are fixed labels, not loose stickers. If the code will not scan, try the serial-number method below before you decide anything.

Method 2: Enter the Serial Number on LONGi’s Module Authenticity Page

If you cannot scan the QR code — the panel is already mounted, or the light is poor — the serial number gives you the same answer. LONGi runs an official Module Authenticity Checker where you can enter the module barcode or serial number and get the panel’s details from the company’s own database.Follow these steps:

1. Find the serial number on the back label of the panel. It is a long alphanumeric code, printed next to the barcode and marked as the serial number or “SN”. The same number is etched under the front glass — check both places, they must be identical.
2. Type longi.com into your browser yourself. Do not click a verification link sent by the dealer or found in a random advertisement. Fake verification websites exist, and they will happily tell you a fake panel is genuine.
3. On LONGi’s website, open the Module Authenticity page and enter the serial number exactly as printed. Double-check every character: one wrong letter or digit will return a “not found” result even for a genuine panel.
4. Read the result. A genuine panel returns its model, production details and warranty information. A “not found” or “invalid” result means the number is not in LONGi’s database.
5. Repeat the check for every panel in your order, not just the first one.

A single failed check is enough reason to stop the deal. If the dealer says the system is down or the panel is “too new to be in the system”, do not accept that explanation — ask for a different panel from the same batch and check that one, or buy elsewhere.

Method 3: Match the Label, Box, Flash Report and Invoice

The online check is the strongest single test, but it works best together with a paper check. A relabelled panel can sometimes carry a copied serial number, so match every document against the panel itself:

• Model code: the full model code on the back label must match the code on the box and the code on your quotation. A genuine Longi panel is sold under the Hi-MO name with a generation number — for example, the current Longi Hi-MO X10 series. If the label says one series and the box says another, something is wrong.
• Wattage and electrical values: the wattage, open-circuit voltage (Voc) and short-circuit current (Isc) on the label must match the flash test report exactly. The flash report is the factory measurement for that exact panel, so its serial number must match the panel too.
• Production date: the date on the label should be consistent with the model generation. A panel labelled as a current series but dated years ago deserves a second look.

Photograph the label, the box and the flash report for every panel before installation. Once panels are mounted on the roof, the back label is hard to reach, and those photos are your only record if a problem appears later.

Physical Checks You Can Do in Five Minutes

Before the panels go on the roof, give each one a careful look. These checks take minutes and catch what paperwork alone can miss:

• Packaging: genuine Longi panels arrive in sealed boxes carrying the LONGi logo, a barcode and the product specifications. Torn, resealed or unbranded boxes suggest the panels were repacked.
• Frame and glass: the aluminium frame should be straight and clean, with even sealant around the glass. Uneven sealant, scratches, dents or a loose junction box point to refurbished or reject stock.
• Cells: look at the cells through the glass. They should be uniform in colour with no cracks, dark patches or finger marks.
• Junction box: the box on the back should sit firmly with no gaps, and its cables and MC4 connectors should be clean and undamaged.
• Label quality: the back label should be printed clearly, with sharp text and a clean barcode. Blurry printing, spelling mistakes, or a label that peels off easily are all warning signs.

Red Flags That Mean Walk Away

Some signs are enough on their own to end the deal. If you see any of these, do not pay:

• The serial number is not found on longi.com. This is the clearest result there is.
• The dealer will not share serial numbers before payment. A genuine seller has nothing to hide — the numbers are printed on the product.
• Two panels share the same serial number. Every genuine panel has a unique number. A duplicate means at least one of them is fake.
• The QR code opens a website that is not longi.com. Lookalike verification sites are a known trick — always type longi.com yourself.
• The label, box and flash report disagree. Different model codes, wattages or serial numbers across the documents mean the paperwork does not belong to the panel.
• No invoice or no warranty paperwork. Undocumented panels are cheaper for a reason: without documents, a warranty claim is very hard to make.
• The panel is sold as A-grade but looks used. Scratches, worn frames or a loose junction box point to B-grade or refurbished stock sold as new.

Our guide on fake vs original solar panel covers these warning signs in more detail, with the checks that apply to every brand — not just Longi.

What to Do If Verification Fails

If a panel fails the check, stay calm and follow these steps in order:

1. Double-check the number first. Retype the serial number slowly, character by character, and try the QR scan again in better light. A typing mistake is the most common reason for a false “not found”.
2. Check a second panel from the same batch. If the second panel verifies fine, the first panel may be the odd one out. If several fail, the whole batch is suspect.
3. Tell the dealer and ask for a replacement. Show the dealer the result on your phone. A genuine dealer will replace the panel or explain the problem. A dealer who argues, rushes you, or offers a discount to “settle it” is telling you everything you need to know.
4. Do not accept the panel. Refuse delivery of any panel that fails verification, and get the refusal noted on the invoice or delivery note.
5. Contact LONGi directly. If the dealer cannot resolve it, reach LONGi through the contact details on longi.com, with photos of the label, the QR code and the dealer’s invoice.

Keep every photo, message and receipt. If you paid in advance and the dealer refuses a refund, that record is what you will need to pursue the matter further.

Buying From the Right Dealer

Verification protects you after the panels arrive, but the dealer you choose matters just as much. Buy from an established dealer who gives you a proper GST invoice, shares serial numbers before payment, and lets you verify the panels at delivery. Our solar panel verification guide for Pakistan explains the same document checks for other brands.Be careful with sellers who only operate through social media messages, refuse to share a shop address, or push you to pay in full before you have seen a single serial number. A real shop with a written invoice is worth far more than a small saving from a seller you cannot find again.If you already own Longi panels, the same steps apply. For Jinko panels, the process is similar but uses Jinko’s own checker, explained in our Jinko serial number check guide.

Check Current Prices

Once your panels are verified as original, the only question left is the price. Check the current solar plate price in pakistan and solar panel price in pakistan on our homepage, where the tables are updated daily. Knowing today’s figures before you talk to a dealer helps you judge any quotation fairly — and if a quote comes in far below the market, verify the panels carefully before you pay.

Frequently Asked Questions (FAQs)