--- title: "Longi Solar LR7-54HTH-475M Solar Panel: Specs & Datasheet | ComparePV" description: "Longi Solar LR7-54HTH-475M solar panel. Specs: 23.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr7-54hth-475m" image: "https://comparepv.com/og/panel/longi-lr7-54hth-475m.png" updated: 2026-09-11 --- # Longi Solar LR7-54HTH-475M Light for its output, short guarantee 302 panels in the segment N-type 450-500 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR7-54HTH-475M - **Series:** Hi-MO X6 Scientist (LR7-54HTH 470~475M) - **Rated power:** 475 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 450-500 W (302 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 475 W | 470 W | Typical | | | Module efficiency | 23.30% | 22.52% | Strong - top 15% | 1,057 | | Power density | 232.7 | 225.3 | Strong - top 20% | 1,231 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 21% | 1,347 | | Weight (kg) | 21.6 kg | 23.7 kg | Strong - top 14% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.30% | 22.52% | Strong - top 15% | 1,057 | | Power density | 232.7 | 225.3 | Strong - top 20% | 1,231 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 21% | 1,347 | | Weight per kWp | 45.5 | 49.7 | Strong - top 14% | 743 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,912 | ### Strengths - **45.5 kg per kWp** - Top 14% of the N-type 450-500 W segment, against a median of 49.7. - **23.30% module efficiency** - Top 15% of the N-type 450-500 W segment, against a median of 22.52%. - **232.7 watts per square metre** - Top 20% of the N-type 450-500 W segment, against a median of 225.3. ### Watch out for - **25 year performance warranty** - Bottom 7% of the N-type 450-500 W segment, against a median of 30 yrs. Ranked 9,912th in the whole database. - **Best for:** Residential, commercial, hot-climate, cold-climate and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 475 W - **Efficiency:** 23.30 % - **Voltage at Pmax (Vmp):** 33.79 V - **Current at Pmax (Imp):** 14.06 A - **Open-circuit voltage (Voc):** 39.95 V - **Short-circuit current (Isc):** 15.07 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/degC - **Temperature coefficient of Voc:** -0.230 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 108 ### Physical - **Length:** 1800 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.6 kg - **Area:** 2.04 m2 - **Power density:** 232.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 89.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 415 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1057 of 14129 | | Power density | 1231 of 14129 | | Temperature coefficient | 1347 of 14129 | | Weight | 743 of 14129 | | Warranty | 9912 of 14129 | ## Pros - **HPBC+ back contact technology** - Conductive pathways are moved to the rear of the cell, eliminating visible busbars and front-side grid lines. This boosts power density on limited roof area and improves module aesthetics - a real advantage for residential installs where every square meter counts. - **Low temperature coefficient of -0.28%/°C** - Per the official datasheet, Pmax degrades only -0.28%/°C, notably better than typical PERC modules (usually -0.35 to -0.40%/°C). This translates into a real yield advantage during summer and on poorly ventilated roofs. - **Full rear-side cell soldering** - The construction reduces the risk of microcracks and degradation caused by mounting stress and thermal cycling, supporting more stable long-term module performance. - **Tier-1 bankable manufacturer since 2000** - Longi Solar is one of the world's largest monocrystalline cell manufacturers with full tier-1 bankability status, reducing counterparty risk compared to less established brands in the peer set (e.g. Sun Earth). - **25-year product and power warranty** - Minimum 89.4% guaranteed power output at year 25 (linear degradation of ~0.44%/year after an initial 99% in year one), per the official datasheet - a standard consistent with the rest of the tier-1 offering in this segment. ## Cons - **Efficiency trails peer comparables** - Maximum efficiency of 23.3% is lower than competitors at the same 475 Wp power class - JA Solar JAM54D40 LB, Astronergy ASTRO N7s 2.0, and Sun Earth TITAN Dual GLASS all reach 23.8%. This means a somewhat larger module footprint is needed for the same power, partly offsetting the power-density benefit of HPBC+. - **No bifacial variant** - The series is monofacial only, while some comparable designs (e.g. Sun Earth TITAN Dual GLASS) offer bifacial versions that capture additional yield from reflected light in ground-mount or high-albedo installations. - **Shorter warranty than Longi's newer lineup** - The 25-year power warranty on Hi-MO X6 Scientist falls short of the 30-year power warranty Longi now offers on its newer Hi-MO X6 Max Scientist / Hi-MO 9 series with HPBC 2.0 technology - within the manufacturer's own portfolio, this model is no longer the flagship option. ## About this series Longi Solar Hi-MO X6 Scientist (LR7-54HTH 470-475M) was designed for maximum energy yield on a limited rooftop surface - without compromising aesthetics. The key advantage is the application of **HPBC+ back-contact cell technology**, which moves the conductive paths to the rear of the cell. This keeps the front module visually "clean" while collecting energy more efficiently, which is crucial when every square meter of installation space counts. The modules also feature **full rear welding**, focused on higher resistance to micro-cracking and more stable performance over time - essential for operation in variable weather conditions. Additionally, the series' construction supports **high reliability** and minimizes the risk of performance degradation due to typical mounting stresses. This is the choice for demanding residential and small commercial installations where power density, roof appearance, and predictable energy yield over years are top priorities. Compared to many standard modules, the Scientist series offers a more refined cell architecture and better quality control in details that make a practical difference. ## Notable figures - Efficiency of 23.3% is 0.8pp above the \*\*N-type 450-500W\*\* median (22.5%) - Power density of 232.7 W/m² packs 7.4 W/m² more into the same footprint vs \*\*N-type 450-500W\*\* median (225.3 W/m²) - Temperature coefficient of -0.28%/°C matches the \*\*N-type 450-500W\*\* median - At 21.6 kg, this panel is 2.1 kg lighter than \*\*N-type 450-500W\*\* median (23.7 kg) - easier handling during installation - In the top 7% for efficiency among all N-type panels ## Questions ### What is the HPBC+ technology used in the LONGi Hi-MO X6 Scientist series, and what does it mean in practice? HPBC+ (Hybrid Passivated Back Contact) relocates all busbars and conductive paths to the rear of the cell, leaving the entire front surface available for light absorption. In the LR7-54HTH series, this translates to module efficiency of 23.0-23.3% at up to 475 Wp - figures that standard PERC or TOPCon cells of the same format cannot match. For the installer, it means more kWh per square meter of roof area without requiring additional power optimizers. ### What warranty does the LONGi Hi-MO X6 Scientist LR7-54HTH 470-475M come with? LONGi provides two independent warranties: a 25-year product warranty covering materials and workmanship, and a 25-year linear power output warranty. According to the official datasheet, the panel should retain at least 87.4% of its rated power after 25 years of operation. Both warranties run from the date of purchase and are honored through LONGi's authorized distribution network. ### Are LONGi Hi-MO X6 Scientist panels a good fit for a roof with limited available space? Yes - the Hi-MO X6 Scientist series is specifically engineered for space-constrained rooftop installations. At 1800×1134×30 mm and 21.6 kg, each module delivers 475 Wp at up to 23.3% efficiency, among the highest values for the 108-cell format. On a 20 m² roof section you can fit a system exceeding 4.5 kWp, making a meaningful difference in annual energy yield under typical Central European irradiance conditions. ### How does the Hi-MO X6 Scientist LR7-54HTH series perform in winter and under overcast conditions? The LR7-54HTH temperature coefficient is just -0.28%/°C - noticeably better than the -0.34 to -0.36%/°C typical of PERC cells. In practice, when outdoor temperatures drop to -10°C, the module produces proportionally more energy relative to its STC rating. N-type cells are also less susceptible to light-induced degradation (LID/LeTID), ensuring stable output across the entire service life of the system, even in variable climates. ### Is the LONGi Hi-MO X6 Scientist a bifacial module? No - the LR7-54HTH 470-475M is a monofacial module. Energy is collected exclusively from the front face, which is fully optically active thanks to the back contact HPBC+ cell architecture. In typical rooftop installations where the panel sits close to the roof surface, bifacial gain would be negligible. LONGi instead focused on maximizing front-side efficiency, a clean all-black aesthetic, and improved resistance to microcracks through full rear-side soldering. ### How does the LONGi Hi-MO X6 Scientist differ from the standard Hi-MO X6 lineup? The Scientist series uses N-type HPBC+ cells instead of the p-type cells found in standard Hi-MO X6 modules, pushing module efficiency to 23.0-23.3% versus roughly 22% for conventional variants. An additional differentiator is full rear-side soldering of cell interconnects, which increases resistance to mounting stress and microcracks. The Scientist line represents LONGi's premium residential and small-commercial tier - chosen when every percentage point of efficiency matters. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lr-7-54-hth-470-475-m-30-30-and-15-frame-scientist-20240529-1449101e9aa2.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +1.7 pp, +5 yr warranty | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, +1.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, +1.4 pp, +5 yr warranty | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | Heavier, +1.4 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, +1.2 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, +1.2 pp, +5 yr warranty | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +25 W, +1.2 pp, +5 yr warranty | | [Longi Solar LR7-54HGBB-440M](https://comparepv.com/panel/longi-lr7-54hgbb-440m) | 440 W | -35 W, -1.7 pp, +5 yr warranty | | [Longi Solar LR7-54HGBB-445M](https://comparepv.com/panel/longi-lr7-54hgbb-445m) | 445 W | -30 W, -1.5 pp, +5 yr warranty | | [Longi Solar LR7-54HGBB-450M](https://comparepv.com/panel/longi-lr7-54hgbb-450m) | 450 W | -25 W, -1.3 pp, +5 yr warranty | | [Longi Solar LR7-54HTH-455M](https://comparepv.com/panel/longi-lr7-54hth-455m) | 455 W | -20 W, -1.0 pp | | [Longi Solar LR7-54HTH-460M](https://comparepv.com/panel/longi-lr7-54hth-460m) | 460 W | -15 W, -0.8 pp | | [Longi Solar LR7-54HTH-465M](https://comparepv.com/panel/longi-lr7-54hth-465m) | 465 W | -10 W, -0.5 pp | --- Source: https://comparepv.com/panel/longi-lr7-54hth-475m 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.