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Longi Solar LR7-72HVHF-660M
Longi Solar Brand review

LR7-72HVHF-660M

660 Wp N-type
ComparePV verdict

Light for its output, no clear weak spot

Rank 509 of 14,005
Compare panels Datasheet PDF
Power (Wp)
660
Typical for its class
Efficiency (%)
24.40
Strong · top 17%
Density (Wp/m²)
244.3
Strong · top 17%
Temp (%/°C)
-0.260
Strong · top 24%
Weight (kg)
28.5
Strong · 5.0 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

109 panels in the segment N-type 650-700 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 2 caution
Best for

Commercial, utility-scale, hot-climate and shaded-installations.

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%.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.40 % Strong Segment median 23.30%
Vmpp · Impp 44.76 V · 14.75 A Operating point at max power
Voc · Isc 54.10 V · 15.45 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 28.5 kg Strong Strong · 5.0 kg below median
Cells 144 · N-type Monocrystalline
Coefficient Pmax -0.260 %/°C Strong top 24% of its segment
Coefficient Voc · Isc -0.200 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 586 W guaranteed
Degradation 1.00 → 0.35 % 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 660 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
-0.260 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR7-72HVHF-660M 660 W 24.40% -0.260 28.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg -10 W, lighter, +0.8 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +20 W, +0.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +15 W, +0.6 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg -15 W, lighter, +0.6 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +40 W, heavier, +0.6 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +35 W, heavier, +0.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +10 W, +0.4 pp
LR8-66HGD-595M 595 W 22.00% -0.280 32.5 kg -65 W, heavier, -2.4 pp
LR7-72HGD-600M 600 W 22.20% -0.280 33.5 kg -60 W, heavier, -2.2 pp
600M 600 W 22.40% -0.280 31.0 kg -60 W, -2.0 pp, -5 yr warranty
LR7-72HTH-605M 605 W 22.40% -0.280 28.5 kg -55 W, -2.0 pp, -5 yr warranty
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +10 W, +0.4 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +10 W, heavier, +0.4 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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