--- title: "Longi Solar LR7-72HVHF-660M 660W Solar Panel - Specs & Review | ComparePV" description: "Longi Solar LR7-72HVHF-660M 660W solar panel. Specs: 24.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr7-72hvhf-660m" updated: 2026-09-11 --- # Longi Solar LR7-72HVHF-660M Light for its output, no clear weak spot 109 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR7-72HVHF-660M - **Series:** Hi-MO X10 Guardian (Anti-Dust) - **Rated power:** 660 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 650-700 W (109 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 660 W | Typical | | | Module efficiency | 24.40% | 23.30% | Strong - top 17% | 99 | | Power density | 244.3 | 233.2 | Strong - top 17% | 88 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 24% | 511 | | Weight (kg) | 28.5 kg | 33.5 kg | Strong - top 5% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 24.40% | 23.30% | Strong - top 17% | 99 | | Power density | 244.3 | 233.2 | Strong - top 17% | 88 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 24% | 511 | | Weight per kWp | 43.2 | 50.9 | Strong - top 5% | 268 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **43.2 kg per kWp** - Top 5% of the N-type 650-700 W segment, against a median of 50.9. Ranked 268th in the whole database. - **244.3 watts per square metre** - Top 17% of the N-type 650-700 W segment, against a median of 233.2. - **24.40% module efficiency** - Top 17% of the N-type 650-700 W segment, against a median of 23.30%. - **Best for:** Commercial, utility-scale, hot-climate and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 24.40 % - **Voltage at Pmax (Vmp):** 44.76 V - **Current at Pmax (Imp):** 14.75 A - **Open-circuit voltage (Voc):** 54.10 V - **Short-circuit current (Isc):** 15.45 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 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 28.5 kg - **Area:** 2.70 m2 - **Power density:** 244.3 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:** 586 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 99 of 14005 | | Power density | 88 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 268 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Record N-type HPBC 2.0 efficiency** - Modules reach up to 24.8% efficiency, roughly 3.2 pp (about 15% relative) higher than comparable 670 Wp designs from Hiwatt Solar (21.6%), Techwise Solar and Resun Solar (21.57% each). Even the lowest-power variant (640 Wp) delivers 23.7% - still above the entire peer group. - **Anti-soiling construction limits dust buildup** - A unique-in-segment Anti-Dust design keeps the module surface cleaner under heavy soiling conditions (low-slope roofs, roadside sites, industrial areas, arid regions), reducing cleaning frequency and O&M costs over the system's lifetime. - **Zero-busbar (0BB) and hot-spot protection** - The back-contact structure with no visible busbar grid increases the cell's active area and limits localized overheating risk, improving fire safety and reducing point-degradation risk versus conventional busbar TOPCon modules. - **30-year linear power warranty, Tier-1 maker** - LONGi Solar (founded 2000, bankable Tier-1) offers a 15-year product warranty and a 30-year linear power warranty - longer than the standard 25 years many competitors offer in this 640-670 Wp power class. - **Award-winning back-contact technology** - The Hi-MO X10 platform won the pv magazine Award 2025 and the Smarter E AWARD 2025 for back-contact innovation, providing independent market validation of the design's quality and performance. ## Cons - **Limited track record (launched 2025)** - The series only reached European markets from March-April 2025, so as of August 2026 it has at most about 1.5 years of real-world field data - less than long-established reference series, making long-term degradation harder to verify. - **Monofacial variant forgoes rear-side gain** - Unlike other Hi-MO X10 family variants (e.g., Scientist) that offer up to 80% bifaciality and extra reflected-light yield, the Guardian Anti-Dust variant is monofacial - on high-albedo roofs (snow, light gravel) buyers forgo the additional energy yield available elsewhere in the range. ## About this series The Longi Solar Hi-MO X10 Guardian (Anti-Dust) series was designed for locations where dust and dirt significantly reduce performance, especially on low-slope roofs, near roads, industrial sites, and dry areas. The key advantage is its **dust-repelling construction**, which keeps the module surface "working clean" for longer, reducing cleaning needs to a reasonable minimum. This translates to more stable performance during dry seasons and lower service costs throughout the system's lifespan. These modules utilize **back-contact HPBC 2.0 technology**, which enhances light capture efficiency and improves the front panel's aesthetics by eliminating visible busbars. In practice, you also gain **greater resilience to shading** (e.g., from chimneys, trees, or localized dirt buildup), helping maintain energy production in challenging conditions. Additionally, the series prioritizes **protection against hot-spot heating**, increasing system safety and longevity. This is a reliable choice for demanding rooftops in homes, businesses, and commercial projects where predictable performance matters, not just paper specifications. ## Notable figures - 24.4% module efficiency - 1.1pp better than the \*\*N-type 650-700W\*\* median of 23.3% - 244.3 W/m² power density - 11.1 W/m² more than \*\*N-type 650-700W\*\* median (233.2 W/m²), more power per roof area - -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures - At 28.5 kg, this panel is 5.0 kg lighter than \*\*N-type 650-700W\*\* median (33.5 kg) - easier handling during installation - In the top 1% for efficiency among all N-type panels ## Questions ### How does the Anti-Dust technology in the LONGi Hi-MO X10 Guardian work, and does it actually reduce cleaning frequency? Yes, the difference is noticeable in real-world installations. The Hi-MO X10 Guardian (Anti-Dust) features a redesigned frame with no A-surface on the short edges, preventing dust and rainwater residue from accumulating in corners and along the frame rails. LONGi pairs this with low-adhesion glass. On low-pitch roofs and dusty sites — near roads, fields, or industrial facilities — the modules stay operationally cleaner for longer, resulting in more stable energy yield and fewer cleaning interventions over the system's lifetime. ### What product and power warranty does the LONGi Hi-MO X10 Guardian (Anti-Dust) come with? LONGi provides a 15-year product warranty covering manufacturing defects and materials, plus a 30-year linear power warranty. According to the datasheet, first-year degradation is capped at 1%, followed by a maximum annual degradation of 0.35%. After 30 years the module is guaranteed to retain at least 88.85% of its nominal power. This is among the most competitive warranty packages currently available for N-type back contact modules. ### Are the LONGi Hi-MO X10 Guardian modules suitable for flat or low-pitch roofs? Yes — this is actually one of the primary use cases for this series. On flat and low-slope roofs (below roughly 10°), dust accumulates far more aggressively because rainfall provides minimal self-cleaning. The Anti-Dust frame design directly addresses this. Additionally, the HPBC 2.0 back contact technology reduces partial-shading losses, which on flat roofs can be caused by ballast, neighboring module rows, or dirty strip buildup along the module edge. ### What is HPBC 2.0 technology and how does it differ from standard N-type TOPCon found in competing panels? HPBC 2.0 (Hybrid Passivated Back Contact) is LONGi's proprietary architecture that moves all electrical contacts to the rear of the cell, eliminating the front busbar grid entirely. This boosts light absorption and improves aesthetics. LONGi rates cell efficiency at 26.6% and module efficiency up to 24.8% — notably higher than typical N-type TOPCon at 21–22.5%. The design also uses the proprietary TaiRay wafer and bipolar passivation, achieving a low power temperature coefficient of -0.26%/°C. ### What is the maximum power output and module efficiency of a single LONGi Hi-MO X10 Guardian (Anti-Dust) panel? The top variant in the series reaches 670 Wp with a module efficiency of up to 24.8%. This places it among the highest-performing commercially available back contact modules for both residential and commercial applications. Given the module dimensions of approximately 2,382×1,134 mm, you get exceptional energy yield per square meter of roof area — an important advantage wherever roof space is limited. ### Is the LONGi Hi-MO X10 Guardian (Anti-Dust) a bifacial module, and can it be used with solar trackers? No — the Hi-MO X10 Guardian (Anti-Dust) is a monofacial module. It generates power only from the front face; the rear side does not contribute additional yield from reflected irradiance. Mounting on single-axis trackers is technically feasible, but the bifacial gain is absent. This series is primarily designed for fixed rooftop installations — both pitched and flat — where its key advantages are the anti-dust frame construction and the high efficiency of the HPBC 2.0 back contact cell, rather than bifacial energy gain. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lr-7-72-hvhf-640-670-m-30-30-and-15-guardian-bgv-02-20250313-43b0b7aaa840.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | -10 W, lighter, +0.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +20 W, +0.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +15 W, +0.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | -15 W, lighter, +0.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, heavier, +0.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +35 W, heavier, +0.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +10 W, +0.4 pp | | [Longi Solar LR8-66HGD-595M](https://comparepv.com/panel/longi-lr8-66hgd-595m) | 595 W | -65 W, heavier, -2.4 pp | | [Longi Solar LR7-72HGD-600M](https://comparepv.com/panel/longi-lr7-72hgd-600m) | 600 W | -60 W, heavier, -2.2 pp | | [Longi Solar 600M](https://comparepv.com/panel/longi-600m) | 600 W | -60 W, -2.0 pp, -5 yr warranty | | [Longi Solar LR7-72HTH-605M](https://comparepv.com/panel/longi-lr7-72hth-605m) | 605 W | -55 W, -2.0 pp, -5 yr warranty | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +10 W, +0.4 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +10 W, heavier, +0.4 pp | --- Source: https://comparepv.com/panel/longi-lr7-72hvhf-660m 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.