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Longi Solar LR7-54HJBB-495M
Longi Solar Brand review

LR7-54HJBB-495M

495 Wp N-type Bifacial
ComparePV verdict

Strong in heat, no clear weak spot

Rank 1,810 of 14,005
Compare panels Datasheet PDF
Power (Wp)
495
Strong · top 4%
Efficiency (%)
24.30
Strong · top 1%
Density (Wp/m²)
242.5
Strong · top 2%
Temp (%/°C)
-0.240
Strong · top 1%
Weight (kg)
23.5
Typical · median 23.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

Longi Solar S10 Double Glass Premium Black (LR7-54HJBB) 490-505M modules are designed for maximum energy production from limited roof surfaces - without compromising on aesthetics. Their key feature is the combination of a heterojunction with back-contact (HIBC) structure, ensuring a uniformly black module front while maximizing light capture even under less-than-ideal conditions. The double glass construction enhances operational stability and resistance to environmental factors, which is especially noticeable in installations exposed to significant temperature fluctuations or challenging weather conditions.

The main advantage of this series is its high tolerance to partial shading and minimized losses, which are common issues in many homes due to chimneys, window frames, or trees. The applied technology also reduces the risk of hot spots, contributing to safety and long-term reliability. This makes it an excellent choice for demanding premium rooftop installations where maximum yield per square meter and the total-black appearance - whether for new builds or renovations - are key priorities.

Ranking

301 panels in the segment N-type 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.30% 22.52% Strong · top 1% 131
Power density 242.5 225.2 Strong · top 2% 159
Temperature coefficient -0.240 -0.290 Strong · top 1% 13
Weight per kWp 47.5 49.5 Typical 1,708
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 2 caution
Best for

Residential and shaded-installations.

Strengths
-0.240 %/°C temperature coefficient

Top 1% of the N-type 450-500 W segment, against a median of -0.290. Ranked 13th in the whole database.

24.30% module efficiency

Top 1% of the N-type 450-500 W segment, against a median of 22.52%. Ranked 131st in the whole database.

242.5 watts per square metre

Top 2% of the N-type 450-500 W segment, against a median of 225.2. Ranked 159th in the whole database.

What owners get
Record 24.7% efficiency

Maximum module efficiency (505 Wp variant) reaches 24.7%, exceeding comparable series in the segment - Sunova Tangra M Pro HD (22.7%), Q-SUN Qrystal N10 (22.7%) and Hiwatt HW-M12/100H (21%) - by 2 to 3.7 percentage points. This translates to a power density of roughly 250 W/m2, critical for limited roof space.

HIBC technology - HJT + back contact

The combination of heterojunction with back-contact architecture is LONGi's first commercialized module of this kind, with cells certified by ISFH at 28.13% and module performance verified by NREL at 26.4%. No visible busbars on the front gives a uniform black look without sacrificing performance, while the back-contact design improves partial-shade tolerance and lowers hot-spot risk.

30-year product and power warranty

The manufacturer provides a 30-year warranty on both the product and power output (minimum ~88.85% retained after 30 years), whereas most tier-1 manufacturers standardize on 12-15 years of product warranty with 25-30 years of power warranty. This represents a meaningful extension of investment protection.

Very low temperature coefficient

The Pmax temperature coefficient is -0.24%/°C, notably better than the typical -0.34% to -0.38%/°C seen on PERC modules. This means lower power losses on hot days and higher realistic annual yield, particularly during summer.

Established Tier-1 manufacturer

LONGi Solar has operated since 2000 and holds Tier-1 bankable status, reducing manufacturer default risk over the 30-year warranty horizon offered on this series.

Trade-offs
Short track record for HIBC technology

This series relies on HIBC technology commercialized only since 2025, so independent, multi-year field performance data is not yet available, unlike more mature PERC or standard TOPCon technologies that have been on the market for several years.

Heavier double-glass construction

The module weighs 23.5 kg at 1800x1134x30 mm dimensions, heavier than typical single-glass/backsheet panels of comparable power and size. For retrofits on older roofs, structural load capacity should be verified before installation.

Notes from the database
  • Efficiency of 24.3% is 1.8pp above the N-type 450-500W median (22.5%)
  • Power density of 242.5 W/m² packs 17.3 W/m² more into the same footprint vs N-type 450-500W median (225.2 W/m²)
  • Temperature coefficient of -0.24%/°C vs median -0.29%/°C means ~2% less power loss at 65°C
  • In the top 1% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 495 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.30 % Strong Segment median 22.52%
Vmpp · Impp 34.17 V · 14.49 A Operating point at max power
Voc · Isc 41.35 V · 15.15 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1800×1134×30 mm · 2.04 m² of roof
Weight 23.5 kg Typical Typical · median 23.7 kg
Cells 108 · N-type Monocrystalline
Coefficient Pmax -0.240 %/°C Strong top 1% of its segment
Coefficient Voc · Isc -0.210 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 30 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 440 W guaranteed
Degradation 1.00 → 0.35 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Longi Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 495 Wp appear here. The rest cover the whole series.

30-Year Power Warranty 30-Year Power Warranty Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.240 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR7-54HJBB-495M 495 W 24.30% -0.240 23.5 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +15 W, +0.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Hotter, lighter, +0.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +10 W, +0.4 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Hotter, lighter
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Very close match
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Hotter, lighter
LR7-54HGBB-440M 440 W 21.60% -0.280 23.6 kg -55 W, hotter, -2.7 pp
LR7-54HGBB-445M 445 W 21.80% -0.280 23.6 kg -50 W, hotter, -2.5 pp
LR7-54HGBB-450M 450 W 22.00% -0.280 23.6 kg -45 W, hotter, -2.3 pp
LR7-54HTH-455M 455 W 22.30% -0.280 21.6 kg Hotter, -2.0 pp, -5 yr warranty
LR7-54HTH-460M 460 W 22.50% -0.280 21.6 kg Hotter, -1.8 pp, -5 yr warranty
LR7-54HTH-465M 465 W 22.80% -0.280 21.6 kg Hotter, -1.5 pp, -5 yr warranty

Found 197 panels of the same or similar size to this one, within ±10 mm. See them here Found 201 panels of the same or similar size to this one, within ±25 mm. See them here Found 1712 panels of the same or similar size to this one, within ±50 mm. See them here Found 4014 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is HIBC technology in the Longi S10 LR7-54HJBB series and why does it matter?
HIBC (Heterojunction Back Contact) combines silicon heterojunction technology with a back contact architecture, moving all electrical contacts to the rear side of the cell. This keeps the front surface fully black and optically active. In practice it delivers module efficiency up to 24.7% and an ultra-low temperature coefficient of -0.24%/°C, meaning smaller power losses on hot days compared to PERC or TOPCon technology.
What warranty does the Longi S10 Double Glass Premium Black series carry and what does it cover?
The LR7-54HJBB series comes with a 30-year product warranty and a 30-year linear power warranty. First-year degradation is capped at 1%, followed by just 0.35% per year - among the best in the industry. After 30 years the module is guaranteed to retain over 87.4% of its nominal power. LONGi Solar is a Tier 1 manufacturer, which significantly reduces the risk of warranty becoming void due to insolvency.
Does the bifacial design of the Longi S10 LR7-54HJBB make sense on a typical pitched residential roof?
On a standard pitched roof with dark tiles, the rear-side bifacial gain is modest (a few percent) due to limited albedo from the substrate. The main benefit in this scenario is the dual glass construction, which eliminates the backsheet and improves long-term durability in demanding weather conditions. Full bifacial potential is realized in ground-mount systems or on white roofing membranes, where additional yield can reach 10-15%.
How does the Longi S10 490-505W series handle partial shading from a chimney or trees?
The back contact architecture of the S10 series eliminates front-side busbars, which reduces the negative interaction between shaded and unshaded cells. Combined with bypass diodes, hot-spot risk is significantly lower than in PERC panels. For installations with persistent shading (chimney, dormer), adding power optimizers or an inverter with shade management is still recommended to fully exploit this built-in shading tolerance.
What is the peak power output of the Longi LR7-54HJBB panels and what are the physical dimensions and weight?
The series covers the 490-505 Wp range with a 0/+3 Wp tolerance. Module dimensions are 1800×1134×30 mm and weight is 23.5 kg. The dual glass build (2.0 mm front, 1.6 mm rear semi-tempered glass) makes it slightly heavier than single-glass alternatives, but enables a front snow load rating of 6000 Pa (roughly 4 meters of snow cover) and wind load of 3600 Pa, making it suitable for demanding European roof installations.
Do Longi S10 LR7-54HJBB panels perform well in winter and under overcast conditions?
Yes. HIBC technology with N-type cells offers higher spectral response under diffuse light and at low irradiance angles typical of Northern European winters. The -0.24%/°C power temperature coefficient is among the lowest on the market - standard PERC modules typically reach -0.35%/°C. At +35°C ambient temperature, the S10 loses approximately 2.4% of its power output vs. nearly 3.5% for a typical PERC module, translating into measurable annual energy gains in cooler climates.
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