--- title: "Longi Solar LR7-72HVD-645M 645W Solar Panel - Specs & Review | ComparePV" description: "Longi Solar LR7-72HVD-645M 645W solar panel: 2 shop offers from 545.38 zł. Specs: 23.90% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/longi-lr7-72hvd-645m" updated: 2026-10-03 --- # Longi Solar LR7-72HVD-645M Efficiency leader, no clear weak spot 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR7-72HVD-645M - **Series:** Hi-MO X10 Scientist (LR7-72HVD 640~665M) - **Rated power:** 645 W - **Cell technology:** N-type - **Bifacial:** yes ## Price offers Prices are the figure each shop printed, on that shop's side of VAT. | Shop | Market | Price | Per kWp | Availability | Last read | | --- | --- | --- | --- | --- | --- | | [PVhurt](https://comparepv.com/go/3323) | Poland | 545.38 zł incl. VAT | 845.55 zł/kWp | Not stated | Last read 4 Oct 01:37 | | [Sistemi Energia](https://comparepv.com/go/302539) | Italy | 145 € incl. VAT | 224.80 €/kWp | In stock | Last read 4 Oct 00:25 | ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 625 W | Strong - top 3% | | | Module efficiency | 23.90% | 22.77% | Strong - top 2% | 351 | | Power density | 238.8 | 227.7 | Strong - top 2% | 356 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 4% | 511 | | Weight (kg) | 33.5 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.90% | 22.77% | Strong - top 2% | 351 | | Power density | 238.8 | 227.7 | Strong - top 2% | 356 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 4% | 511 | | Weight per kWp | 51.9 | 52.7 | Typical | 5,361 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.90% module efficiency** - Top 2% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 351st in the whole database. - **238.8 watts per square metre** - Top 2% of the N-type 600-650 W segment, against a median of 227.7. Ranked 356th in the whole database. - **-0.260 %/°C temperature coefficient** - Top 4% of the N-type 600-650 W segment, against a median of -0.290. Ranked 511th in the whole database. - **Best for:** Commercial, utility-scale and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 23.90 % - **Voltage at Pmax (Vmp):** 44.77 V - **Current at Pmax (Imp):** 14.41 A - **Open-circuit voltage (Voc):** 54.12 V - **Short-circuit current (Isc):** 15.06 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.200 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 144 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.5 kg - **Area:** 2.70 m2 - **Power density:** 238.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 573 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 351 of 14005 | | Power density | 356 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 5361 of 14005 | | Warranty | 21 of 14005 | ## Pros - **HPBC 2.0 back-contact technology** - Cells with contacts moved to the rear eliminate front-side busbars, enabling up to 24.6% efficiency - on par with the best back-contact modules on the market (Sunpro 24.62%, Talesun 24.6%) and clearly ahead of legacy PERC and standard TOPCon. - **Built-in shading optimizer** - The dedicated HPBC 2.0 architecture reduces power loss under partial shading by about 70% compared to conventional TOPCon modules (manufacturer data), which matters for roofs with chimneys, dormers, or nearby structures. - **Low power temperature coefficient** - A -0.26%/°C coefficient is roughly 0.03 pp better than typical TOPCon modules (~-0.29%/°C), translating into smaller output losses on hot days and higher yield in warmer climates. - **30-year power warranty with low degradation** - Degradation of ≤1% in the first year and ≤0.35%/year thereafter results in about 88.85% retained power after 30 years - better than the standard 25-year warranties with ~84-85% retention typical of many competing series. - **Established Tier-1 manufacturer** - Longi Solar has operated since 2000 and holds bankable Tier-1 status, easing project financing for C&I installations and providing added confidence in long-term warranty support versus less established brands. ## Cons - **Price premium over TOPCon modules** - Back-contact HPBC modules, including Hi-MO X10, are positioned by Longi as a premium tier - priced above its own TOPCon Hi-MO 6 series and mainstream TOPCon offerings from competitors. The higher cost per Wp may not be justified in projects where LCOE, rather than maximum power density, is the primary driver. ## About this series Longi Solar Hi-MO X10 Scientist (LR7-72HVD 640-665M) is designed to maximize energy yield where every square meter counts and production predictability is key. Its foundation is **HPBC 2.0 back-contact technology**, an architecture with contacts moved to the rear side-eliminating front-side metal pathways that hinder light absorption. In practice, this translates to better real-world performance, not just in the lab. A key advantage is the **built-in shading optimizer**, which minimizes losses when shade from a chimney, branch, or rooftop installation falls on the panel. Additionally, the **0BB (zero busbar) structure** efficiently collects current and enhances aesthetics, often a crucial factor in visible rooftop installations. The applied **multilayer structure** helps utilize light more effectively and stabilize long-term performance. This is an excellent choice for demanding rooftop systems, commercial installations, and C&I projects where resilience to partial shading and high module efficiency are significant advantages. ## Notable figures - At 23.9% efficiency, this panel is 1.1pp above typical \*\*N-type 600-650W\*\* modules (median: 22.8%) - Power density of 238.8 W/m² packs 11.1 W/m² more into the same footprint vs \*\*N-type 600-650W\*\* median (227.7 W/m²) - Temperature coefficient of -0.26%/°C vs median -0.29%/°C means ~1% less power loss at 65°C - At 33.5 kg, weight matches the \*\*N-type 600-650W\*\* median - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### What is HPBC 2.0 technology in the LONGi Hi-MO X10 Scientist and how does it differ from standard modules? HPBC 2.0 is a back contact cell architecture where all electrical contacts are relocated to the rear of the cell, leaving the front surface completely free of busbars and ribbons to maximize light absorption. The LR7-72HVD reaches module efficiency up to 24.6%. The 0BB (zero busbar) design further shortens current transmission distance by 6.5%, adding approximately 5W per module — delivering real-world energy gains that go beyond lab-rated figures. ### How does the built-in shading optimizer work in the LONGi Hi-MO X10 Scientist LR7-72HVD, and when does it actually matter? Unlike conventional modules that bypass entire cell strings under shading, the HPBC 2.0 shading optimizer isolates only the shaded cells, keeping the rest of the module at full output. TÜV Rheinland-certified testing confirms power losses from point-like shading are reduced by over 70% compared to standard TOPCon modules. This translates into measurable daily energy gains on rooftops where chimneys, antennas, or branches cast partial shadows on the panel. ### Is the LONGi Hi-MO X10 Scientist LR7-72HVD bifacial, and how much additional energy can it generate? Yes, the LR7-72HVD is a bifacial dual-glass module with 80% bifaciality. The rear side captures reflected irradiance from rooftop membranes, gravel ballast, or bright ground surfaces and converts it into additional electricity. On flat commercial rooftops with a white TPO or PVC membrane, real-world bifacial gain typically ranges from a few to over ten percent compared to a monofacial module of the same rated power. ### What warranty does the LONGi Hi-MO X10 Scientist LR7-72HVD 640–665M come with? LONGi provides a 15-year product warranty covering materials and workmanship, plus a 30-year linear power output warranty. Degradation is kept to a minimum throughout the 30-year performance horizon. LONGi Solar holds Tier 1 manufacturer status, which carries weight when securing project financing and confirms the company's bankability according to independent market assessments. ### Are the LONGi Hi-MO X10 Scientist 640–665M panels a good fit for commercial C&I flat-roof installations? This series is specifically designed with C&I applications in mind. The large format (approx. 2,382 × 1,134 mm, ~33.5 kg, up to 665 Wp) reduces the number of modules, wiring runs, and mounting points needed per megawatt. Bifaciality pairs well with white flat-roof membranes to boost yield, while the built-in shading optimizer limits losses from HVAC units, skylights, and pipes — directly lowering the installation's LCOE. ### How does the LONGi Hi-MO X10 Scientist LR7-72HVD perform in high temperatures during summer? With a temperature coefficient of -0.26%/°C, the Hi-MO X10 Scientist loses significantly less power on hot days than standard PERC or TOPCon modules. Testing also showed that HPBC 2.0 cells reach a peak temperature of approximately 100°C under point-like shading, while TOPCon modules can exceed 160°C under the same conditions — improving both long-term durability and installation safety. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lr-7-72-hvd-640-665-m-30-30-and-15-scientist-bgv-03-20250313-da40e938d9e1.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Lighter, +1.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +1.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +1.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Lighter, +1.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, heavier, +1.0 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +25 W, lighter, +0.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +25 W, lighter, +0.9 pp | | [Longi Solar LR8-66HGD-595M](https://comparepv.com/panel/longi-lr8-66hgd-595m) | 595 W | -50 W, hotter, -1.9 pp | | [Longi Solar LR7-72HGD-600M](https://comparepv.com/panel/longi-lr7-72hgd-600m) | 600 W | -45 W, hotter, -1.7 pp | | [Longi Solar 600M](https://comparepv.com/panel/longi-600m) | 600 W | -45 W, -1.5 pp, -5 yr warranty | | [Longi Solar LR7-72HTH-605M](https://comparepv.com/panel/longi-lr7-72hth-605m) | 605 W | Lighter, -1.5 pp, -5 yr warranty | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +55 W, heavier, +1.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +25 W, lighter, +0.9 pp | --- Source: https://comparepv.com/panel/longi-lr7-72hvd-645m Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.