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Longi Solar Brand review

LR5-54HTH-445M

445 Wp Monocrystalline
ComparePV verdict

Light for its output, short guarantee

Rank 6,974 of 14,005
Compare panels Datasheet PDF
Power (Wp)
445
Typical for its class
Efficiency (%)
22.80
Strong · top 13%
Density (Wp/m²)
227.9
Strong · top 12%
Temp (%/°C)
-0.290
Typical · median -0.300
Weight (kg)
20.8
Strong · 2.7 kg below median
Warranty (yrs)
25
Weak · bottom 17%

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

7,294 panels in the 345-545 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 22.80% 21.50% Strong · top 13% 2,714
Power density 227.9 215.1 Strong · top 12% 2,790
Temperature coefficient -0.290 -0.300 Typical 2,165
Weight per kWp 46.7 52.7 Strong · top 11% 1,339
Performance warranty 25 yrs 30 yrs Weak · bottom 17% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

7 positive · 3 caution
Best for

Residential and commercial.

Not ideal for

Owners who want a long output guarantee.

Strengths
46.7 kg per kWp

Top 11% of the 345-545 W band, against a median of 52.7.

227.9 watts per square metre

Top 12% of the 345-545 W band, against a median of 215.1.

22.80% module efficiency

Top 13% of the 345-545 W band, against a median of 21.50%.

Watch-outs
25 year performance warranty

Bottom 17% of the 345-545 W band, against a median of 30 yrs.

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
  • 22.8% module efficiency - 1.0pp better than the database median of 21.8%
  • Power density of 227.9 W/m² packs 9.8 W/m² more into the same footprint vs database median (218.1 W/m²)
  • Temperature coefficient of -0.29%/°C matches the database median
  • 20.8 kg weight - 5.7 kg lighter than database median (26.5 kg), reducing installation effort
  • Ranked #2714 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 445 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.80 % Strong Segment median 21.50%
Vmpp · Impp 33.44 V · 13.31 A Operating point at max power
Voc · Isc 39.73 V · 14.37 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 Strong Strong · 2.7 kg below median
Cells 108 Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.300 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 17% · median 30 yrs
End-of-warranty output 88.9 % Equals 387 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 445 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 -0.300
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR5-54HTH-445M 445 W 22.80% -0.290 20.8 kg You are here
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +50 W, +2.0 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +45 W, +1.7 pp, +5 yr warranty
STP-NT11/48QGSF-490 490 W 24.50% -0.260 21.5 kg +45 W, +1.7 pp, +5 yr warranty
JAT54S40-485/LR 485 W 24.30% -0.260 19.3 kg +40 W, +1.5 pp, +5 yr warranty
AIKO-A485-MCE54Mw 485 W 24.30% -0.260 21.0 kg +40 W, +1.5 pp, +5 yr warranty
LR7-54HJD-495M 495 W 24.30% -0.240 23.5 kg +50 W, +1.5 pp, +5 yr warranty
AIKO-A485-MAH54Mw 485 W 24.30% -0.260 21.5 kg +40 W, +1.5 pp, +5 yr warranty
LR5-54HIB-390M 390 W 20.00% -0.340 21.5 kg -55 W, hotter, -2.8 pp
LR5-54HIB-395M 395 W 20.20% -0.340 21.5 kg -50 W, hotter, -2.6 pp
LR5-54HPB-400M 400 W 20.50% -0.340 20.8 kg -45 W, hotter, -2.3 pp
LR5-54HPH-405M 405 W 20.70% -0.340 20.8 kg -40 W, hotter, -2.1 pp
LR5-54HPH-410M 410 W 21.00% -0.340 20.8 kg -35 W, hotter, -1.8 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +65 W, +2.2 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +60 W, +1.9 pp, +5 yr warranty
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +55 W, +1.7 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 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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