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Longi Solar LR5-54HTDB-425M
Longi Solar Brand review

LR5-54HTDB-425M

425 Wp Monocrystalline
ComparePV verdict

Solid all-round for its segment

Rank 8,069 of 14,129
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.80
Typical · median 21.50%
Density (Wp/m²)
217.6
Typical · median 215.1
Temp (%/°C)
-0.290
Typical · median -0.300
Weight (kg)
22.5
Typical · median 23.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Longi Solar Hi-MO X6 Artist Ultra Black series is designed for investors who want their PV installation to appear as a single architectural element, not as an aesthetic compromise. Its key feature is the 360° black effect - achieved thanks to a special glass structure and selective cell colour matching, eliminating the “solar panel look” visible in many full-black panels. The applied HPBC (back contact) technology moves the connections to the cell rear side, resulting in a cleaner optical front and better light utilisation, especially under suboptimal sunlight conditions.

In practice, this means more stable energy production throughout the day and better performance on complex roof geometries or partially shaded surfaces. The construction with dual-glass with POE film enhances resistance to environmental factors and mechanical stress, which homeowners in high-wind and hail-prone areas will appreciate. The modules are also bifacial, making them suitable not just for roofs, but also for carports and balcony canopies, where the underside appearance matters.

Ranking

7,015 panels in the 325-525 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.80% 21.50% Typical 7,085
Power density 217.6 215.1 Typical 7,235
Temperature coefficient -0.290 -0.300 Typical 2,220
Weight per kWp 52.9 52.9 Typical 6,715
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 2 caution
Best for

Residential and shaded-installations.

What owners get
HPBC 2.0 technology with strong shade tolerance

The module uses HPBC (Hybrid Passivated Back Contact) technology, which independent testing shows generates roughly 32.6% more power than TOPCon modules under partial shading and cuts shading-related power loss by up to 70% versus standard TOPCon. The busbar-free, gridless front also increases light absorption by more than 2% over TOPCon modules of the same power class.

Uniform 360° aesthetic finish

Special textured glass and AOI-based cell sorting eliminate the 'checkerboard' effect common in many full-black modules, confirmed by the French Design Awards (Gold Winner 2024) and A' Design Award (Iron Winner 2024). This is a real advantage for projects where roof aesthetics matter.

Extended 25/30-year warranty

The 25-year product warranty and 30-year power warranty exceed the typical market standard of 12-15/25 years and align with the latest premium-segment offerings from 2024 onward, reducing long-term investment risk.

Bankable Tier-1 manufacturer with 25 years of history

Longi Solar (founded in 2000) is a recognized Tier-1 manufacturer, easing project financing and reducing the risk of unavailable warranty service in the future - important given the 25-30 year warranty period.

Dual-glass construction with POE encapsulant

Double glass and POE encapsulation improve resistance to hail, moisture, and mechanical stress compared to cheaper backsheet-based constructions, which matters for installations in regions prone to strong wind or hailstorms.

Trade-offs
Price premium for back-contact technology

HPBC/back-contact modules typically cost 5-10% more than comparable TOPCon panels (e.g., Lina Energy LEPV 108 Nexa TOPCon, SunKean SKT415-435M10-108D4) at a similar 435 Wp power class and 22.26-22.3% efficiency, which can lengthen payback for price-sensitive buyers.

Shorter field track record

The series launched in 2024, so HPBC 2.0 has a much shorter documented field history than mature PERC/TOPCon technologies deployed for over a decade; long-term real-world degradation can only be fully assessed a few years from now.

Notes from the database
  • At 21.8% efficiency, this panel is on par with typical database modules
  • At 217.6 W/m² power density, roof space requirements are typical for database panels
  • Temperature coefficient of -0.29%/°C matches the database median
  • At 22.5 kg, this panel is 4.0 kg lighter than database median (26.5 kg) - easier handling during installation
  • In the top 50% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.80 % Typical Segment median 21.50%
Vmpp · Impp 33.27 V · 12.78 A Operating point at max power
Voc · Isc 39.65 V · 13.61 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 22.5 kg Typical Typical · median 23.0 kg
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 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 86.9 % Equals 369 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 425 Wp appear here. The rest cover the whole series.

30-Year Power Warranty 30-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 LR5-54HTDB-425M 425 W 21.80% -0.290 22.5 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, lighter, +2.0 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, lighter, +2.0 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, heavier, +2.0 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, heavier, +2.0 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +2.0 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +2.0 pp
LR5-54HIB-390M 390 W 20.00% -0.340 21.5 kg Hotter, -1.8 pp, -5 yr warranty
LR5-54HIB-395M 395 W 20.20% -0.340 21.5 kg Hotter, -1.6 pp, -5 yr warranty
LR5-54HPB-400M 400 W 20.50% -0.340 20.8 kg Hotter, -1.3 pp, -5 yr warranty
LR5-54HPH-405M 405 W 20.70% -0.340 20.8 kg Hotter, -1.1 pp, -5 yr warranty
LR5-54HPH-410M 410 W 21.00% -0.340 20.8 kg Hotter, -0.8 pp, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, cooler, +3.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +80 W, cooler, +2.9 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +80 W, cooler, +2.9 pp

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1928 panels of the same or similar size to this one, within ±25 mm. See them here Found 3413 panels of the same or similar size to this one, within ±50 mm. See them here Found 4007 panels of the same or similar size to this one, within ±100 mm. See them here

About the Hi-MO X6 Artist Ultra Black series

6 answered

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

What is HPBC technology in the LONGi Hi-MO X6 Artist Ultra Black and why does it matter?
HPBC (Hybrid Passivated Back Contact) moves all electrical contacts to the rear of the cell, leaving the front face completely free of metal grids and busbars. This eliminates front-side shading losses and improves light absorption. Under real-world conditions, it delivers up to 1.54% more energy than comparable TOPCon modules of the same power class - a meaningful advantage in climates with frequent overcast days.
What warranty does the LONGi Solar Hi-MO X6 Artist Ultra Black come with?
The Hi-MO X6 Artist Ultra Black includes a 25-year product warranty covering materials and workmanship, plus a 30-year linear power output warranty guaranteeing at least 86.9% of rated power after 30 years. This places it among the longest-warranted residential PV modules currently available on the market.
Does the all-black design of the LONGi Hi-MO X6 Artist Ultra Black reduce its efficiency?
Dark modules absorb slightly more heat, which can marginally reduce instantaneous output at very high temperatures. However, HPBC cell technology brings module efficiency up to 22.3%, on par with many standard residential modules. The 360-degree ultra-black aesthetic does not involve a significant efficiency trade-off compared to conventional panels.
What are the dimensions and weight of the 435 W LONGi Hi-MO X6 Artist Ultra Black panel?
The 435 W module measures 1,722 × 1,134 × 30 mm and weighs approximately 22.5 kg. The compact width suits standard residential pitched roofs. The dual-glass construction with 3.2 mm tempered coated glass provides a front mechanical load tolerance of 6,000 Pa for snow and wind, and 3,600 Pa on the rear - suitable for regions with heavy snowfall.
Are LONGi Hi-MO X6 Artist Ultra Black panels suitable for roofs with partial shading or chimneys?
Yes. Back-contact cell design removes all front-side metal grids, reducing losses caused by diffuse irradiance and partial shading - common on roofs with chimneys, dormers, or gable walls. The Hi-MO X6 Artist Ultra Black generates over 1.5% more energy than comparable TOPCon modules under low-light conditions, resulting in a higher annual energy yield in temperate climates.
Do LONGi Hi-MO X6 Artist Ultra Black panels require special inverters or mounting hardware?
No special inverters are needed. The modules are compatible with standard single-phase and three-phase inverters with conventional MPPT voltage ranges. Mounting holes follow industry-standard spacing, so no proprietary racking systems are required. It is advisable to confirm with your installer that the roof structure and racking can handle the module weight of approximately 22.5 kg per panel.
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