--- title: "Longi Solar LR5-54HTDB-420M Solar Panel: Specs & Datasheet | ComparePV" description: "Longi Solar LR5-54HTDB-420M solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr5-54htdb-420m" image: "https://comparepv.com/og/panel/longi-lr5-54htdb-420m.png" updated: 2026-09-11 --- # Longi Solar LR5-54HTDB-420M Solid all-round for its segment 6,992 panels in the 320-520 W band, all technologies ## Identity - **Manufacturer:** Longi Solar - **Model:** LR5-54HTDB-420M - **Series:** Hi-MO X6 Artist Ultra Black - **Rated power:** 420 W - **Cell technology:** Monocrystalline ## How it compares Compared against 320-520 W band, all technologies (6992 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 440 W | Typical | | | Module efficiency | 21.50% | 21.50% | Typical | 8,022 | | Power density | 215.1 | 214.9 | Typical | 7,946 | | Temperature coefficient | -0.290 | -0.300 | Typical | 2,220 | | Weight (kg) | 22.5 kg | 23.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 21.50% | Typical | 8,022 | | Power density | 215.1 | 214.9 | Typical | 7,946 | | Temperature coefficient | -0.290 | -0.300 | Typical | 2,220 | | Weight per kWp | 53.6 | 53.0 | Typical | 7,655 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Residential and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 33.07 V - **Current at Pmax (Imp):** 12.71 A - **Open-circuit voltage (Voc):** 39.45 V - **Short-circuit current (Isc):** 13.54 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/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 count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 22.5 kg - **Area:** 1.95 m2 - **Power density:** 215.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 86.9 % - **First-year degradation:** 1.50 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 365 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8022 of 14129 | | Power density | 7946 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 7655 of 14129 | | Warranty | 21 of 14129 | ## Pros - **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. ## Cons - **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. ## About this series 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. ## Notable figures - At 21.5% efficiency, this panel is on par with typical \*\*database\*\* modules - Power density of 215.1 W/m² is 3.0 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - Temperature coefficient of -0.29%/°C matches the \*\*database\*\* median - Weight of 22.5 kg (4.0 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - Ranked #8022 out of 14129 panels for efficiency in the database ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lr-5-54-htdb-420-435-m-1-f86ea0d32b-c94c6004f701.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, lighter, +2.3 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.3 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.2 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, lighter, +2.1 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [Longi Solar LR5-54HIB-390M](https://comparepv.com/panel/longi-lr5-54hib-390m) | 390 W | Hotter, -1.5 pp, -5 yr warranty | | [Longi Solar LR5-54HIB-395M](https://comparepv.com/panel/longi-lr5-54hib-395m) | 395 W | Hotter, -1.3 pp, -5 yr warranty | | [Longi Solar LR5-54HPB-400M](https://comparepv.com/panel/longi-lr5-54hpb-400m) | 400 W | Hotter, -1.0 pp, -5 yr warranty | | [Longi Solar LR5-54HPH-405M](https://comparepv.com/panel/longi-lr5-54hph-405m) | 405 W | Hotter, -0.8 pp, -5 yr warranty | | [Longi Solar LR5-54HPH-410M](https://comparepv.com/panel/longi-lr5-54hph-410m) | 410 W | Hotter, -0.5 pp, -5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.2 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/longi-lr5-54htdb-420m 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.