--- title: "Longi Solar LR7-54HJBB-495M 495W Solar Panel - Specs & Review | ComparePV" description: "Longi Solar LR7-54HJBB-495M 495W solar panel. Specs: 24.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr7-54hjbb-495m" updated: 2026-09-11 --- # Longi Solar LR7-54HJBB-495M Strong in heat, no clear weak spot 301 panels in the segment N-type 450-500 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR7-54HJBB-495M - **Series:** S10 Double Glass Premium Black (LR7-54HJBB) 490~505M - **Rated power:** 495 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 450-500 W (301 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 495 W | 470 W | Strong - top 4% | | | 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 (kg) | 23.5 kg | 23.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### 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. - **Best for:** Residential and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 495 W - **Efficiency:** 24.30 % - **Voltage at Pmax (Vmp):** 34.17 V - **Current at Pmax (Imp):** 14.49 A - **Open-circuit voltage (Voc):** 41.35 V - **Short-circuit current (Isc):** 15.15 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.210 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 108 - **Bifacial:** yes ### Physical - **Length:** 1800 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 23.5 kg - **Area:** 2.04 m2 - **Power density:** 242.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 440 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 131 of 14005 | | Power density | 159 of 14005 | | Temperature coefficient | 13 of 14005 | | Weight | 1708 of 14005 | | Warranty | 21 of 14005 | ## Pros - **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. ## Cons - **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. ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lr-7-54-hjbb-490-505-m-30-30-and-15-frame-bgv-02-20250905-en-54c21b111570.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +15 W, +0.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Hotter, lighter, +0.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +10 W, +0.4 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Hotter, lighter | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Very close match | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Hotter, lighter | | [Longi Solar LR7-54HGBB-440M](https://comparepv.com/panel/longi-lr7-54hgbb-440m) | 440 W | -55 W, hotter, -2.7 pp | | [Longi Solar LR7-54HGBB-445M](https://comparepv.com/panel/longi-lr7-54hgbb-445m) | 445 W | -50 W, hotter, -2.5 pp | | [Longi Solar LR7-54HGBB-450M](https://comparepv.com/panel/longi-lr7-54hgbb-450m) | 450 W | -45 W, hotter, -2.3 pp | | [Longi Solar LR7-54HTH-455M](https://comparepv.com/panel/longi-lr7-54hth-455m) | 455 W | Hotter, -2.0 pp, -5 yr warranty | | [Longi Solar LR7-54HTH-460M](https://comparepv.com/panel/longi-lr7-54hth-460m) | 460 W | Hotter, -1.8 pp, -5 yr warranty | | [Longi Solar LR7-54HTH-465M](https://comparepv.com/panel/longi-lr7-54hth-465m) | 465 W | Hotter, -1.5 pp, -5 yr warranty | --- Source: https://comparepv.com/panel/longi-lr7-54hjbb-495m Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.