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Longi Solar Brand review

LR5-54HTB-450M

450 Wp Back Contact
ComparePV verdict

Middle of its segment, short guarantee

Rank 6,550 of 14,005
Compare panels Datasheet PDF
Power (Wp)
450
Weak · bottom 4%
Efficiency (%)
23.00
Weak · bottom 13%
Density (Wp/m²)
230.4
Weak · bottom 17%
Temp (%/°C)
-0.290
Weak · bottom 5%
Weight (kg)
20.8
Typical · median 23.5 kg
Warranty (yrs)
25
Weak · bottom 3%

The Hi-MO X6 Scientist series represents a technological breakthrough, utilizing the innovative HPBC (Hybrid Passivated Back Contact) cell architecture. The key innovation is the complete elimination of front-side metallization, which allows for the full use of the cell surface for sunlight absorption. This solution effectively eliminates the problem of energy losses caused by traditional busbars, offering users maximum conversion efficiency that exceeds market standards. Models in this line are primarily dedicated to demanding residential installations and modern office buildings, where limited roof space requires the use of components with the highest power density. Thanks to their optimized structure, the panels guarantee exceptional performance in low-light conditions, which is crucial in the Polish climate. They are distinguished from the competition not only by their unique, aesthetic appearance without visible connections, but also by their increased resistance to degradation caused by atmospheric factors. By choosing Hi-MO X6 Scientist, investors receive a guarantee of stable power production for decades, while simultaneously minimizing system operating costs. This is currently one of the most advanced premium solutions, combining uncompromising science with practical financial benefits for the installation owner.

Ranking

156 panels in the segment Back Contact 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.00% 23.50% Weak · bottom 13% 1,919
Power density 230.4 235.2 Weak · bottom 17% 1,708
Temperature coefficient -0.290 -0.260 Weak · bottom 5% 2,165
Weight per kWp 46.2 48.0 Typical 1,071
Performance warranty 25 yrs 30 yrs Weak · bottom 3% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

4 positive · 5 caution
Best for

Residential and commercial.

Not ideal for

Owners who want a long output guarantee, hot climates and tight roof space.

Watch-outs
25 year performance warranty

Bottom 3% of the Back Contact 450-500 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database.

-0.290 %/°C temperature coefficient

Bottom 5% of the Back Contact 450-500 W segment, against a median of -0.260. Ranked 2,165th in the whole database.

23.00% module efficiency

Bottom 13% of the Back Contact 450-500 W segment, against a median of 23.50%.

What owners get
Best-in-class efficiency

Efficiency up to 23.3% outperforms all comparable modules in this power class - LEDVANCE M435~455N54LB-SF-F7 (22.77%), Sunlike SKT420~455M10-108D6 (22.8%), and Solitek SOLRIF D Black (22.56%). This is a real 0.5-0.7 percentage point lead over the nearest tier-1 competitors.

No busbars - high power density

Back Contact (HPBC) technology eliminates front-side metallization and busbars, and combined with the compact 1722×1134 mm (~1.95 m²) footprint delivers a power density of up to ~233 W/m² - a real advantage where roof area is limited in residential and commercial office installations.

Full 25-year product warranty

Unlike many tier-1 manufacturers offering a 10-15 year product warranty alongside a 25-year power warranty, Hi-MO X6 Scientist provides an identical, full 25-year coverage period for both product and power output - a rarity in the premium segment.

Bankable manufacturer with long track record

LONGi Solar has operated since 2000 and holds tier-1 bankable status, easing project financing through banks and leasing institutions and reducing long-term warranty-related risk.

Trade-offs
No bifacial variant available

The series is monofacial only, ruling out additional rear-side energy gain (typically 3-10% depending on ground albedo) available in some competing premium lines built on bifacial TOPCon or HJT cells.

Limited field track record for HPBC

Commercial rollout of Back Contact cells in this series began in 2023, meaning significantly less field deployment history than mature PERC or TOPCon technologies with over a decade of data - long-term real-world degradation behavior is less independently verified.

Notes from the database
  • At 23.0% efficiency, this panel is on par with typical Back Contact 450-500W modules
  • Power density of 230.4 W/m² is 4.8 W/m² below Back Contact 450-500W median (235.2 W/m²) - needs more roof space
  • -0.29%/°C temperature coefficient - 0.03pp worse than Back Contact 450-500W median (-0.26%/°C), expect higher hot weather losses
  • 20.8 kg weight - 2.7 kg lighter than Back Contact 450-500W median (23.5 kg), reducing installation effort
  • Ranked #1919 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 450 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.00 % Weak Segment median 23.50%
Vmpp · Impp 33.96 V · 13.27 A Operating point at max power
Voc · Isc 40.23 V · 14.31 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 20.8 kg Typical Typical · median 23.5 kg
Cells 108 · Back Contact Monocrystalline
Coefficient Pmax -0.290 %/°C Weak bottom 5% 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 3% · median 30 yrs
End-of-warranty output 88.9 % Equals 391 W guaranteed
Degradation 1.50 → 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 450 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
-0.290 %/°C against a segment median of -0.260
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR5-54HTB-450M 450 W 23.00% -0.290 20.8 kg You are here
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +45 W, +1.8 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +40 W, +1.5 pp, +5 yr warranty
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +50 W, +1.5 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +50 W, +1.5 pp, +5 yr warranty
GK-3-54HGb-500M 500 W 24.50% -0.260 21.4 kg +50 W, +1.5 pp, +5 yr warranty
GCL-NR10R/54BGDF 500 W 24.50% -0.260 24.6 kg +50 W, +1.5 pp, +5 yr warranty
LR5-54HIB-390M 390 W 20.00% -0.340 21.5 kg -60 W, hotter, -3.0 pp
LR5-54HIB-395M 395 W 20.20% -0.340 21.5 kg -55 W, hotter, -2.8 pp
LR5-54HPB-400M 400 W 20.50% -0.340 20.8 kg -50 W, hotter, -2.5 pp
LR5-54HPH-405M 405 W 20.70% -0.340 20.8 kg -45 W, hotter, -2.3 pp
LR5-54HPH-410M 410 W 21.00% -0.340 20.8 kg -40 W, hotter, -2.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +60 W, +2.0 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +55 W, +1.7 pp, +5 yr warranty

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is HPBC technology and how does it differ from standard PERC cells in the Hi-MO X6 Scientist?
HPBC (Hybrid Passivated Back Contact) moves all cell metallization to the rear side, making the entire front surface available for light absorption. Eliminating front busbars raises cell efficiency beyond 25.8% and module efficiency up to 23.3% — well above the ~21–22% typical of PERC panels. The absence of front metallization also reduces micro-crack risk and gives the panel its distinctive all-black aesthetic.
What warranty does the LONGi Hi-MO X6 Scientist come with and what does it cover?
LONGi Solar backs the Hi-MO X6 Scientist with a 25-year product warranty covering material and manufacturing defects, plus a 25-year linear power warranty guaranteeing at least 87.4% of rated output after 25 years of operation. These are among the strongest warranty terms in the premium segment, providing solid investment security over the full system lifetime.
Is the Hi-MO X6 Scientist 455 W panel compatible with a standard residential pitched roof?
Yes. The LR5-54HTH model (455 Wp) measures 1722×1134×30 mm and weighs approximately 21.6 kg — dimensions fully compatible with standard residential mounting systems such as aluminum rails and roof hooks. The compact 54-cell format is easy to handle on pitched roofs and works well on complex roof layouts with dormers, chimneys, or limited usable area.
How do Hi-MO X6 Scientist panels perform in overcast conditions and low-light environments?
The back-contact HPBC architecture combined with a low temperature coefficient of just -0.29%/°C (better than the typical -0.35%/°C for PERC modules) enables the Hi-MO X6 Scientist to generate noticeably more energy under diffuse and low-irradiance conditions. This is a key advantage in climates with limited peak-sun hours, where a significant share of annual yield comes from overcast days.
Is the Hi-MO X6 Scientist a bifacial panel, and should I choose it over cheaper bifacial alternatives?
No — the Hi-MO X6 Scientist (455 Wp) is a monofacial module. It has no rear glass or transparent backsheet to collect reflected albedo light. On a standard rooftop (dark felt or roof tiles), the lack of bifaciality is not a drawback since albedo gain would be negligible anyway. Instead, you get industry-leading single-side module efficiency above 23%, a clean busbar-free appearance, and superior power density per square meter of roof space.
How does the Hi-MO X6 Scientist compare to the Hi-MO X6 Explorer, and which one should I choose?
The Hi-MO X6 Scientist uses HPBC+ cells delivering module efficiency up to 23.3%, while the Hi-MO X6 Explorer relies on standard HPBC cells at around 22.8%. The Scientist also offers higher power density, a cleaner appearance without visible front busbars, and a slightly better temperature coefficient. If your roof space is limited and maximizing energy output per square meter is the priority, the Scientist is the justified premium choice.
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