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Longi Solar LR7-54HTH-475M
Longi Solar Brand review

LR7-54HTH-475M

475 Wp N-type
ComparePV verdict

Light for its output, short guarantee

Rank 5,370 of 14,129
Compare panels Datasheet PDF
Power (Wp)
475
Typical for its class
Efficiency (%)
23.30
Strong · top 15%
Density (Wp/m²)
232.7
Strong · top 20%
Temp (%/°C)
-0.280
Strong · top 21%
Weight (kg)
21.6
Strong · 2.1 kg below median
Warranty (yrs)
25
Weak · bottom 7%

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.

Ranking

302 panels in the segment N-type 450-500 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 4 caution
Best for

Residential, commercial, hot-climate, cold-climate and shaded-installations.

Not ideal for

Owners who want a long output guarantee.

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-outs
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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 475 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.30 % Strong Segment median 22.52%
Vmpp · Impp 33.79 V · 14.06 A Operating point at max power
Voc · Isc 39.95 V · 15.07 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 21.6 kg Strong Strong · 2.1 kg below median
Cells 108 · N-type Monocrystalline
Coefficient Pmax -0.280 %/°C Strong top 21% of its segment
Coefficient Voc · Isc -0.230 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 25 years Weak bottom 7% · median 30 yrs
End-of-warranty output 89.4 % Equals 415 W guaranteed
Degradation 1.00 → 0.40 % 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 475 Wp appear here. The rest cover the whole series.

25-Year Power Warranty 25-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
-0.280 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR7-54HTH-475M 475 W 23.30% -0.280 21.6 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, +1.7 pp, +5 yr warranty
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, +1.5 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, +1.4 pp, +5 yr warranty
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg Heavier, +1.4 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, +1.2 pp, +5 yr warranty
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, +1.2 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +25 W, +1.2 pp, +5 yr warranty
LR7-54HGBB-440M 440 W 21.60% -0.280 23.6 kg -35 W, -1.7 pp, +5 yr warranty
LR7-54HGBB-445M 445 W 21.80% -0.280 23.6 kg -30 W, -1.5 pp, +5 yr warranty
LR7-54HGBB-450M 450 W 22.00% -0.280 23.6 kg -25 W, -1.3 pp, +5 yr warranty
LR7-54HTH-455M 455 W 22.30% -0.280 21.6 kg -20 W, -1.0 pp
LR7-54HTH-460M 460 W 22.50% -0.280 21.6 kg -15 W, -0.8 pp
LR7-54HTH-465M 465 W 22.80% -0.280 21.6 kg -10 W, -0.5 pp

Found 213 panels of the same or similar size to this one, within ±10 mm. See them here Found 217 panels of the same or similar size to this one, within ±25 mm. See them here Found 1735 panels of the same or similar size to this one, within ±50 mm. See them here Found 4051 panels of the same or similar size to this one, within ±100 mm. See them here

About the Hi-MO X6 Scientist (LR7-54HTH 470~475M) series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

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.
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