Quick Verdict — LONGi X10 vs JA Solar for Pakistan 2026
Because both panels are the same physical size class (~144 cells, ~2333×1134 mm, 32.5 kg), the comparison is honest and direct. LONGi X10 wins on the numbers that decide output and lifetime value: higher efficiency (24.80% vs 22.7%) — roughly 70W more from the same roof area; a better Pmax temperature coefficient (−0.26 vs −0.30%/°C), which matters a lot in Pakistan's heat; a longer 15-year product warranty (vs 12); slower degradation (0.35 vs 0.4%/yr); back-contact soft-breakdown shading; and an exclusive Anti-Dust option. JA Solar wins on bifaciality (80% vs 70% — see the Bifacial Myth).
In fairness: JA Solar is a top global Tier-1 maker and the DeepBlue 4.0 Pro is a solid N-type TOPCon panel — a reasonable choice, especially for a clean, open roof where its higher bifaciality pays off. The LONGi X10 is the higher-performance, longer-warranty pick — and on most Pakistani roofs it is the smarter buy. Either way, both are faked here — verify the serial.
LONGi X10 vs JA DeepBlue 4.0 Pro — Full Datasheet Comparison
Like-for-like, from the official datasheets: LONGi Hi-MO X10 Scientist (LR7-72HVD, HPBC 2.0 back-contact) vs JA Solar DeepBlue 4.0 Pro (JAM72D40, N-type TOPCon). Both are 72-cell-class, dual-glass bifacial modules in the same physical size class — same ~144-cell footprint and 32.5 kg weight — so the electrical and efficiency figures are directly comparable. Headline numbers are shown for each module's top variant.
| Specification | LONGi Hi-MO X10 (LR7-72HVD) | JA Solar DeepBlue 4.0 Pro (JAM72D40) | Winner |
|---|---|---|---|
| Physical Size / Cells Same size = a true apples-to-apples comparison | ~2382×1134×30mm · 144 cells · 32.5 kg | ~2333×1134×30mm · 144 cells · 32.5 kg | Same class |
| Cell Technology Determines shading response, heat behaviour & the efficiency ceiling | HPBC 2.0 — N-type back contact 0BB zero-busbar, no front gridlines; TaiRay wafer |
N-type TOPCon (Mono-16BB) Tunnel-oxide passivation; front busbars present |
LONGi ✓ Soft-breakdown shade edge |
| Peak Module Efficiency Same size — so this is the real technology gap, ~70W more per panel | 24.80% (670W) 24.06% at 650W |
22.7% (600W) 21.7% at 575W |
LONGi ✓ ~2.1% more per m² |
| Rated Power (top variant) From the same physical footprint | 670W | 600W (575–600W range) | LONGi ✓ ~70W more, same area |
| Voc — top variant Open-circuit voltage — affects string sizing | 54.62V (670W) | 52.40V (600W) | Different by design |
| Isc — top variant Short-circuit current | 15.46A (670W) | 14.48A (600W) | Different by design |
| Vmp / Imp — top variant Voltage & current at max power | 45.27V / 14.80A | 43.76V / 13.71A | Different by design |
| Pmax Temp Coefficient Less negative = less power loss on hot days. PK summer cell temps hit 70–75°C. | −0.26%/°C | −0.30%/°C | LONGi ✓ Notably better in heat |
| Voc Temp Coefficient Lower magnitude = steadier voltage in heat | −0.20%/°C | −0.26%/°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 ± 10% | JA Solar ✓ 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 No anti-dust variant in Pakistan's market |
LONGi ✓ Exclusive option |
| Aesthetics — Front Face 0BB removes the visible front grid | No front gridlines (0BB) | Visible front busbars (16BB) | LONGi ✓ |
| Operating Temperature Range | −40°C to +85°C | −40°C to +85°C | Equal |
| Junction Box / Max Fuse | IP68 · 30A fuse | IP68 · 30A fuse | Equal |
| Max System Voltage | 1500V | 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 ✓ Holds more output |
| 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 | Multiple importers — verify carefully | LONGi ✓ |
LONGi also makes the X10 in monofacial (LR7-72HVH — single 3.2mm glass, 28.5 kg, same 24.80% / 24.06% efficiency class), plus Anti-Dust (Guardian HVDF) and Anti-Glare variants, across four series — Explorer, Scientist, Guardian and Artist.
⚡ The Efficiency & Technology Gap — Same Size, So It's Real
This is what separates the JA comparison from a Canadian or Trina one. With some rivals, a higher watt number is mostly a bigger panel. Not here. JA Solar's DeepBlue 4.0 Pro and the LONGi X10 are the same physical size class — both ~144-cell, ~2333×1134 mm, 32.5 kg. So the difference in output from that identical footprint is pure technology:
- Efficiency: the X10 converts 24.80% of the sunlight hitting each square metre to electricity; the DeepBlue 4.0 Pro converts 22.7%. From the same panel area that is roughly 70W more per panel — more kilowatts on the same roof.
- Cell architecture: the X10 uses HPBC 2.0 back-contact (all contacts on the rear, no front gridlines, mass-production cell efficiency >26.6%); the DeepBlue uses mainstream N-type TOPCon with front busbars. Back-contact is the newer, higher ceiling of the two.
- Heat: the X10's −0.26%/°C Pmax coefficient holds more output than JA's −0.30%/°C on Pakistan's hottest days — and −0.30 is meaningfully worse exactly when you need the power most.
- What it means for a small roof: if your roof fits 16 panels, that 24.80% vs 22.7% is a measurable kW difference in the same area — you simply install more capacity on the same structure with the X10.
In fairness: 22.7% TOPCon is genuinely good — JA's DeepBlue 4.0 Pro is a strong, mainstream N-type module. The X10 is simply a generation ahead on the cell, and because the panels are the same size, that shows up cleanly as more watts. Source: LONGi TÜV Rheinland certification.
⚠ The Bifacial Myth on Pakistani Rooftops
JA Solar's one clear datasheet edge is bifaciality: 80% vs LONGi's 70%. On paper that looks like JA captures more rear-side energy. 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 JA's 80% earns its 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 L2/L3 tilt stands sitting close to the roof, flat shed roofs — JA's 80%-vs-70% bifacial edge is largely academic, and it does not close the 24.80% vs 22.7% front-efficiency gap that applies in full daylight on every roof. LONGi's monofacial X10 (lighter at 28.5 kg, same front efficiency) is often the smartest rooftop choice of all. Bifacial only earns its premium on elevated ground-mounts or white commercial roofs.
⚠ Why Same-Size Efficiency Is the Honest Comparison (the Wattage Myth)
A common assumption in the market is that a higher-wattage panel must be more advanced. It usually isn't. A panel's wattage is simply its area × its efficiency — so a bigger watt number very often just means a physically bigger panel, not better technology.
That is exactly why this LONGi vs JA Solar page is so clean: the two panels are the same size. There is no "JA padded the watts with a bigger panel" or "LONGi won on size" argument to make. From identical footprints, the X10's 670W comes purely from higher efficiency (24.80%) than JA's 600W (22.7%). Same area, more output — that is the only time a higher watt number genuinely means a better panel.
- Against other brands, beware: a large-format 700W+ utility panel can be older tech at ~21–22% efficiency, while a 650W LONGi X10 is 24.06% — the smaller-watt panel is the better technology.
- A bigger panel also costs you in handling: heavier, more wind load, more roof area per panel — so more watts per panel does not automatically mean more kW on your roof.
- Because JA's DeepBlue and the X10 share a footprint, none of that applies — you can read the efficiency difference straight across.
Look at efficiency (%) for the same physical size, the cell technology, then the temperature coefficient, shading behaviour and degradation — not the headline watt figure. By that measure the LONGi X10 leads the JA DeepBlue 4.0 Pro cleanly: same size, higher efficiency, better heat behaviour, longer warranty.
⚡ The Real Difference — HPBC 2.0 Back-Contact & "Soft-Breakdown" Shading
Beyond raw efficiency, the cell architecture decides how each panel behaves when a shadow falls on it — and on a Pakistani roof, something always does. Here is the part that matters most:
How a conventional panel fails under shade. A standard panel — including JA's TOPCon DeepBlue — 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 30 years
- HPBC 2.0 = BC × Bipolar Hybrid Passivation × TaiRay Wafer × 0BB, mass-production cell efficiency >26.6%; LONGi's global simulation shows +8.7% generation vs TOPCon (~30W more power than an equivalent TOPCon module)
- 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: JA's junction box also has 3 bypass diodes — that is normal and not a flaw. 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 JA Solar DeepBlue 4.0 Pro ships with standard glass 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 JA Solar
Where LONGi X10 Wins
From the same physical footprint: higher efficiency (24.80% vs 22.7%) — about 70W more per panel and more kW on the same roof; a better Pmax temperature coefficient (−0.26 vs −0.30%/°C) that holds output in Pakistan's heat; HPBC 2.0 back-contact soft-breakdown shading (>70% less loss, >28% lower hot-spot, TÜV-certified); a longer 15-year product warranty (vs 12); slower degradation (0.35 vs 0.4%/yr); the exclusive Anti-Dust option; and cleaner 0BB aesthetics. The efficiency, heat and shade advantages apply on essentially every Pakistani roof.
Where JA Solar DeepBlue Wins (genuinely)
JA Solar is a top global Tier-1 manufacturer and the DeepBlue 4.0 Pro is not a strawman — it is a solid, mature N-type TOPCon module with a real 22.7% efficiency, the same size and 32.5 kg weight, IP68 junction box and 30-year linear warranty. It runs a higher bifaciality (80% vs 70%). On an elevated ground-mount or a high-albedo commercial roof — where its bifacial edge is actually realizable — genuine JA DeepBlue 4.0 Pro is a perfectly reasonable choice.
Our Recommendation
Because the panels are the same size, the X10's higher efficiency, better heat behaviour and longer warranty come with no size penalty — so for a typical Pakistani home or factory roof (limited area, some shade, dust, summer heat) the LONGi Hi-MO X10 from Saigal Solar is the smarter long-term buy; consider the lighter monofacial X10 for less structural load. Choose genuine JA DeepBlue 4.0 Pro for an elevated ground-mount or open commercial roof where its 80% bifaciality is genuinely realizable. Whichever you pick, the one mistake that ruins a project is buying a fake — verify the serial either way.
Which Should You Choose — LONGi X10 or JA DeepBlue 4.0 Pro?
Run the install through these questions and the answer is usually obvious:
- Is roof space limited and you want the most kW on it? → LONGi X10. Same panel size, 24.80% vs 22.7% — more capacity in the same area.
- Does the roof get hot (most Pakistani roofs in summer, cell temps 70–75°C)? → LONGi X10. Its −0.26%/°C loses less than JA's −0.30%/°C on peak days.
- 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 the roof a clean, open, unshaded elevated ground-mount where rear gain is realizable? → genuine JA DeepBlue 4.0 Pro from a verified authorised source is a reasonable choice for its 80% bifaciality.
- Is it an elevated ground-mount or a white, high-albedo commercial roof with a real air gap and wide rows? → JA's 80% bifaciality genuinely pays off there.
- 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 DeepBlue
Both LONGi and JA Solar are counterfeited in Pakistan's grey market (around 15–20% counterfeit in developing markets) — and because JA Solar is one of the most widely-sold panels in this market, it is among the most counterfeited brands here. 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, JA 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 — and one of the most common against widely-traded brands like JA: lower-grade cells are 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. If a JA Solar street price looks far below the authorised level, you are almost certainly looking at counterfeits. 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 · Solar industry fraud warnings, Pakistan
FAQ — LONGi X10 vs JA Solar DeepBlue 4.0 Pro
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