Quick Verdict — LONGi X10 vs Canadian Solar TOPBiHiKu7 for Pakistan 2026
LONGi X10 wins on technology. It is more efficient (24.80% vs 22.7%), runs a better Pmax temperature coefficient (−0.26 vs −0.29 %/°C), carries a longer product warranty (15 vs 12 years), degrades less (0.35 vs 0.4 %/yr), is lighter (32.5 vs 37.8 kg), and adds back-contact Soft-Breakdown shading. Canadian's TOPBiHiKu7 wins on raw watts per panel (705 vs 670W) and bifaciality (80% vs 70%) — but only because it is a physically bigger 210mm panel at lower efficiency.
The honest catch: more watts means more size, not better technology (the Wattage Myth, below). Per square metre of roof, the X10 produces more. In fairness — Canadian Solar is a reputable Tier-1 manufacturer, and the TOPBiHiKu7 is a sound large-format panel that earns its place on big ground-mounts and commercial roofs where size and 80% bifaciality pay off. Either way, both brands are faked here — verify the serial.
LONGi X10 vs Canadian Solar TOPBiHiKu7 — Full Datasheet Comparison
Bifacial vs bifacial, from the official datasheets: LONGi Hi-MO X10 (LR7-72HVD, HPBC 2.0 back-contact, dual glass) vs Canadian Solar TOPBiHiKu7 (CS7N-705TB-AG, N-type TOPCon, dual glass with anti-reflective front). Note the size and format difference up front: the X10 is a 2382×1134×30mm, 32.5 kg, 144-cell module; the Canadian TOPBiHiKu7 is a much larger 2384×1303×33mm, 37.8 kg, 132-cell 210mm module. Headline electrical figures are the 670W X10 and the 705W Canadian flagship.
| Specification | LONGi Hi-MO X10 (LR7-72HVD) | Canadian TOPBiHiKu7 (CS7N-705TB-AG) | Winner |
|---|---|---|---|
| Cell Technology Determines shading response, heat behaviour & the efficiency ceiling | HPBC 2.0 — N-type back contact 0BB, no front gridlines; 144 cells (6×24) |
N-type TOPCon Front busbars present; 132 cells [2×(11×6)], 210mm |
LONGi ✓ Back-contact shade edge |
| Module Efficiency The real measure of technology — watts per m² of roof | 24.80% (670W) · 24.06% (650W) | 22.7% (705W) | LONGi ✓ ~2.1 points more per m² |
| Rated Power Watts = area × efficiency — see the Wattage Myth below | 670W (also 650W) | 705W (675–705W range) | Canadian ✓ …but it's a bigger panel |
| Dimensions / Format Bigger panel = more roof area & load per panel | 2382×1134×30mm — standard 72-cell | 2384×1303×33mm — large 210mm format ~15% wider; harder to handle |
LONGi ✓ Easier rooftop fit |
| Weight Structural load on the roof & mounting | 32.5 kg | 37.8 kg ~5.3 kg heavier per panel |
LONGi ✓ Less load |
| Voc / Isc Open-circuit voltage / short-circuit current — affects string sizing | 54.62V / 15.46A | 48.1V / 18.54A | Different by design |
| Vmp / Imp Voltage & current at max power | 45.27V / 14.80A | 40.2V / 17.55A | Different by design |
| Pmax Temp Coefficient Less negative = less power loss on hot days | −0.26%/°C | −0.29%/°C | LONGi ✓ |
| Voc Temp Coefficient Lower magnitude = steadier voltage in heat | −0.20%/°C | −0.25%/°C | LONGi ✓ |
| Shade Behaviour Partial shade from tanks, aerials, parapet walls is unavoidable on most Pakistani roofs | Cell-level Soft-Breakdown Only the shaded cell drops out; >70% less loss + >28% lower hot-spot (TÜV, June 2025) |
3 bypass diodes (1/3 each) Shading one cell can cut a whole third of the panel |
LONGi ✓ Applies on nearly every roof |
| Bifaciality Rear-vs-front cell ratio — NOT the energy gain (see Bifacial Myth) | 70 ± 5% | 80 ± 5% | Canadian ✓ Ground/flat mount only |
| Anti-Dust / Soiling Option Critical in Faisalabad textile dust, smog & industrial air | Available — X10 Guardian Anti-Dust (HVDF) | Standard glass only AR front, but no anti-dust variant in Pakistan |
LONGi ✓ Exclusive option |
| Aesthetics — Front Face 0BB removes the visible front grid | No front gridlines (0BB) | Visible front busbars | LONGi ✓ |
| Operating Temperature Range | −40°C to +85°C | −40°C to +85°C | Equal |
| Max Series Fuse Bifacial variant | 30A | 35A | Different by design |
| Junction Box / Max System Voltage | IP68 · 1500V | IP68 (3 diodes) · 1500V | Equal |
| Product Warranty | 15 years | 12 years | LONGi ✓ 3 years longer |
| Performance Warranty | 30 years linear | 30 years linear | Equal |
| Degradation Year 1, then annual | 1% yr 1, then 0.35%/yr | 1% yr 1, then 0.4%/yr | LONGi ✓ Slower fade |
| LID / LeTID Both N-type — no light-induced degradation | Zero LID (N-type HPBC 2.0) | Zero LID (N-type TOPCon) | Equal |
| Authorised Dealer — Faisalabad Determines warranty enforcement, serial verification & counterfeit risk | Saigal Solar — LONGi Flagship Store | Verify carefully — no dedicated flagship | LONGi ✓ |
LONGi also makes the X10 in monofacial (LR7-72HVH — single 3.2mm glass, 28.5 kg, 25A fuse, same 24.80% / 24.06% efficiency class) plus Anti-Dust (Guardian HVDF) and Anti-Glare variants — even lighter at the same front efficiency, ideal for rooftops.
⚠ The "Higher Wattage = Better Panel" Myth — The Headline Here
This is the single most important point on this page, because it is exactly what the Canadian TOPBiHiKu7's 705W number triggers. The market assumes a 705W panel must be more advanced and more efficient than a 670W one. It isn't. A panel's wattage is simply its area × its efficiency — so a higher watt number very often just means a physically bigger panel, not newer technology or a better cell.
Run the actual numbers. The Canadian Solar CS7N-705TB-AG makes 705W from a 2384×1303mm body at 22.7% efficiency. The LONGi X10 makes 670W from a smaller 2382×1134mm body at 24.80% efficiency. The Canadian panel out-watts the X10 only because it is roughly 15% wider and 5.3 kg heavier — a bigger bucket, not a better one.
- Efficiency (%) is the real measure of technology — how much of the sunlight hitting each square metre becomes electricity. At 24.80% vs 22.7%, the LONGi X10 puts more kW on the same roof than the larger Canadian panel does.
- The bigger panel costs you elsewhere: 37.8 kg vs 32.5 kg is more structural load and harder handling; the larger format carries more wind load and needs more roof area per panel — so more watts per panel does not automatically mean more kW on your roof.
- Per square metre of roof — the only fair test — the X10 wins. A higher watt number genuinely means better tech only when two panels are the same physical size; these two are not.
Look at efficiency (%), then cell technology (back-contact HPBC > TOPCon > older PERC), then temperature coefficient, shading behaviour, degradation and warranty — then price. Never let a bigger watt number from a larger, lower-efficiency panel decide the purchase.
⚠ The Bifacial Myth on Pakistani Rooftops
Canadian's second headline advantage is its 80% bifaciality vs LONGi's 70%. On a datasheet that looks decisive. On a rooftop, it mostly evaporates.
A datasheet "bifaciality %" is the rear-vs-front cell-efficiency ratio, not the energy you actually gain. The real gain is bifaciality × how much light reaches the rear — and on a rooftop, very little does.
- Ground-mount (elevated racking 1–1.5 m up, wide row spacing, high-albedo ground like white gravel): real rear gain of 5–15%, up to 20–25% in optimal conditions. Here Canadian's 80% — and its large format — earn their money.
- Rooftop (panels low/flush, 0.1–0.3 m off the roof, tight rows): real rear gain is only 2–5%, often near zero.
Why rooftop bifacial gain collapses:
- Low mounting height — the rear sits inches from the roof, so almost no light reaches it. Raising height from 0.5 m to 2 m adds 10–15% rear irradiance — which rooftops simply can't do.
- Low roof albedo (~0.10–0.15 for a typical roof vs the 0.35–0.45 a bifacial panel needs to perform).
- Tight row spacing on limited roofs — rows shade each other's backs.
- Rear obstructions — purlins, rails, conduit and junction boxes block the back of the module.
Staying honest: it isn't literally zero — a white or light-coloured commercial flat roof with a real air gap and proper tilt can still capture ~5–10%.
For the way solar is actually installed on Pakistani homes and factories — low tilt stands sitting close to the roof, flat shed roofs — Canadian's 80%-vs-70% bifacial edge is largely academic. In fact LONGi's monofacial X10 is often the smarter rooftop choice: lighter (28.5 kg), the same front efficiency, and the back-contact shade advantage applies on every roof. Canadian's bifaciality only earns its premium on elevated ground-mounts or white commercial roofs.
⚡ The Real Technology Gap — HPBC 2.0 Back-Contact & "Soft-Breakdown" Shading
Beyond the efficiency number, the cell architecture is what decides real-world output on a Pakistani roof. Here is the part that matters most:
How a conventional panel fails under shade. A standard panel — including Canadian's TOPCon TOPBiHiKu7 — has 3 bypass diodes, each protecting one third of the module. Shade a single cell and that diode triggers, shutting down a whole third of the panel (~33% loss) even if the shadow covers under 1% of it. This is "hard breakdown".
How LONGi X10 behaves instead. Because HPBC 2.0 puts all contacts on the rear (back-contact), LONGi engineered a cell-level "Soft-Breakdown": current autonomously leaks through the shaded cell at a lower voltage, so only that one cell drops out — not a whole third. The string keeps generating.
- >70% less power loss under partial shade vs TOPCon — LONGi + TÜV Rheinland, certified June 2025; awarded TÜV Rheinland Class A shadow resistance
- Hot-spot temperature reduced by >28% under shade — a direct fire-safety and longevity benefit over 25 years
- Why it matters here: real Pakistani rooftops have water tanks, parapet walls, aerials and neighbouring buildings casting partial shade — so this advantage applies on essentially every roof, unlike the bifacial gain above
In fairness: Canadian's junction box also has 3 bypass diodes — that is normal. The difference is that LONGi's cell-level soft-breakdown means those diodes trigger far less often. Source: LONGi TÜV Rheinland certification.
🌨 The Anti-Dust Advantage — Exclusive to LONGi X10
Pakistan's air is hard on glass. Faisalabad's textile mills throw off fine fibre dust; farmland adds crop and soil particles; smog, exhaust and construction dust run year-round. The LONGi Hi-MO X10 Guardian Anti-Dust (LR7-72HVDF) uses a hydrophilic nano-coating that stops fine particles sticking to the glass — reducing soiling losses and cutting cleaning frequency. The Canadian TOPBiHiKu7 ships with a standard anti-reflective front only; there is no anti-dust equivalent in Pakistan's current market.
Source: LONGi Hi-MO X10 Anti-Dust Pro
The Honest Verdict — LONGi vs Canadian Solar
Where LONGi X10 Wins
The things that decide real rooftop output and lifetime value: higher efficiency (24.80% vs 22.7%) so more kW fit the same roof; HPBC 2.0 back-contact soft-breakdown shading (a shaded cell drops one cell, not a whole third — >70% less loss, >28% lower hot-spot, TÜV-certified); a better Pmax temperature coefficient (−0.26 vs −0.29) and Voc coefficient; a longer 15-year product warranty (vs 12); lower degradation (0.35 vs 0.4%/yr); lighter weight (32.5 vs 37.8 kg); the exclusive Anti-Dust option; and cleaner 0BB aesthetics.
Where Canadian Solar TOPBiHiKu7 Wins (genuinely)
Be fair — Canadian Solar is a reputable Tier-1 manufacturer and the TOPBiHiKu7 is a strong panel, not a strawman. It makes more raw watts per panel (705 vs 670W), runs a higher bifaciality (80% vs 70%), and its large 210mm format means fewer panels and rails per kW on a big array. On an elevated ground-mount or a high-albedo commercial roof, that combination of large format and high bifaciality is a sensible choice.
Our Recommendation
Match the panel to the install. Typical Pakistani home or factory roof (low stands, some shade, dust) → LONGi Hi-MO X10 from Saigal Solar — and consider the lighter monofacial X10 for less structural load at the same efficiency. Big open ground-mount or large commercial roof → the Canadian TOPBiHiKu7 is a strong option where its size and 80% bifaciality pay off. Whichever you pick, the one mistake that actually ruins a project is buying a fake — verify the serial on the official portal either way.
Which Should You Choose — LONGi X10 or Canadian TOPBiHiKu7?
Run the install through these questions and the answer is usually obvious:
- Is it a rooftop with limited space where you want maximum kW from the area? → LONGi X10. Higher efficiency fits more kW per square metre.
- Does the roof have partial shade from a water tank, aerial, parapet wall or neighbouring building? → LONGi X10. Back-contact soft-breakdown loses far less under shade.
- Is it a dusty belt — textile area, near a road, farmland — and you won't clean often? → LONGi X10 Guardian Anti-Dust.
- Is it a low rooftop stand close to the roof (the usual Pakistani install)? → LONGi X10, ideally the lighter monofacial — Canadian's bifacial edge won't show here, and the lighter panel reduces load.
- Is it a big open ground-mount or a white, high-albedo commercial roof with a real air gap and wide rows? → the large-format Canadian TOPBiHiKu7 is a strong option where its size and bifaciality genuinely pay off.
- Do you want one local point of contact for warranty and serial verification in Faisalabad? → LONGi X10 via Saigal Solar's flagship store.
Not sure how many panels of either brand your home or factory needs? Build your exact system online → — pick the panel and see the real system size and monthly generation.
⚠ The Pakistan Fake Panel Reality — True for Both X10 and Canadian Solar
Both LONGi and Canadian Solar are counterfeited in Pakistan's grey market (around 15–20% counterfeit in developing markets). Picking the "better" panel means nothing if the panel on your roof is a fake of either one.
The verification website that wasn't
A homeowner told us he'd done his homework — checked his serials online before buying, found what looked like the official portal through Google, got a green "Verified ✓". Six months later his 6kW system peaked at 3.2kW on full sun. Re-run through the actual manufacturer portal: nothing. The site he'd used was a professional clone, one character off the real URL — a working lookup system feeding fake data.
The scratch test
A factory owner came in furious his 35kW rooftop was reading half the expected output on a clear day. The brand stamps looked perfect. We asked one thing: "Scratch the barcode on the back with your fingernail." It peeled — a paper sticker on top of the glass. Genuine LONGi, Canadian Solar and all Tier-1 panels have their barcodes laser-etched inside the glass laminate. You cannot scratch them off. A sticker that peels is a 100% confirmed counterfeit.
The wattage flash
The most sophisticated fraud: lower-grade cells re-labelled at a higher wattage and flash-tested to briefly hit the stamped rating. Quick multimeter checks pass; output looks fine for 6–8 months — right until the return window closes. By year two they degrade 5–8% a year instead of the warranted ~0.4%; by year five they make 60–70% of rating. No warranty, no recourse.
When independent investigations put 15–20% of solar panels in developing markets at substandard or counterfeit, the burden of proof sits with the seller. An honest dealer verifies in front of you — on the real portal, typed directly — without hesitation. Any reluctance is your answer.
At Saigal Solar: every LONGi panel we supply is verified by serial number on the official LONGi portal, in front of you, before it goes on your roof. We are the authorised Flagship Dealer with the documentation. If a panel doesn't verify, it doesn't get installed.
Sources: ARY News — Counterfeit panels investigation · Jinko Solar Pakistan official fraud warning
FAQ — LONGi X10 vs Canadian Solar TOPBiHiKu7
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