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Longi Solar LR7-72HVDF-645M
Longi Solar Brand review

LR7-72HVDF-645M

645 Wp N-type Bifacial 70%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,084 of 14,005
Compare panels Datasheet PDF
Power (Wp)
645
Strong · top 3%
Efficiency (%)
23.90
Strong · top 2%
Density (Wp/m²)
238.8
Strong · top 2%
Temp (%/°C)
-0.260
Strong · top 4%
Weight (kg)
33.5
Typical · median 32.5 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Longi Solar Hi-MO X10 Guardian (LR7-72HVDF 640-665M) series is engineered to maintain high performance where other modules typically lose efficiency - in dusty conditions, seasonal shading, and at risk of hotspots. The key difference is the anti-dust frame design, which minimizes dirt accumulation on the glass edges, thereby reducing performance degradation over time and decreasing the need for cleaning. In practice, this ensures more reliable operation during dry seasons, on sites near roads, industrial facilities, or in polluted areas.

The modules feature back-contact architecture, which enhances light capture on the front side of the cells and supports energy yield even under challenging exposure conditions. Additionally, the series emphasizes shade resistance - experiencing fewer losses from shading caused by chimneys, skylights, obstacles, and pollution. Another important feature is reduced localized heating, increasing long-term safety and operational predictability. This makes it an excellent choice for large-scale PV farms and commercial & industrial (C&I) rooftops, where high performance, serviceability, and lower energy costs over the lifetime are key priorities.

Ranking

359 panels in the segment N-type 600-650 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 1 caution
Best for

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

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.

What owners get
HPBC 2.0 back contact, up to 24.6% efficiency

The back-contact architecture eliminates front-side busbars, delivering efficiency up to 24.6% - on par with the best peer comparables (Sunpro Power at 24.62%, Talesun at 24.6%) and clearly ahead of Waaree Arka (21.29%).

Unique anti-dust frame design

The frame profile that limits dirt buildup along the glass edge is a feature rarely seen among peer comparables. In practice this means slower yield degradation and less frequent module cleaning on PV farms and large C&I roofs in dry or dusty regions.

Low degradation - 88.85% power at year 30

A first-year degradation of 1% and a linear annual degradation rate of 0.35% guarantee 88.85% of rated power after 30 years - above the typical 87.4% threshold offered by many tier-1 manufacturers on older TOPCon lines.

Bifacial N-type module with shading resilience

The back-contact design reduces losses from partial shading (chimneys, skylights, soiling), while the bifacial module's dual-side operation boosts energy yield from reflected irradiance - relevant for ground-mount and C&I roof installations.

Longi as a bankable Tier-1 manufacturer

Longi Solar has operated since 2000 and is classified as a bankable Tier-1 manufacturer, easing financing for large-scale PV projects and increasing confidence in honoring warranty claims over a 15-30 year horizon.

Trade-offs
15-year product warranty below 2026 premium standard

While the 30-year power warranty (88.85% retention) is best-in-class, the 15-year product warranty is notably shorter than competing premium N-type lines in 2026 - JA Solar DeepBlue and Trina Vertex S+, for instance, already offer 25-year product warranties.

Notes from the database
  • 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)
  • -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures
  • At 33.5 kg, weight matches the N-type 600-650W median
  • 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 645 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.90 % Strong Segment median 22.77%
Vmpp · Impp 44.77 V · 14.41 A Operating point at max power
Voc · Isc 54.12 V · 15.06 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 33.5 kg Typical Typical · median 32.5 kg
Cells 144 · N-type Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.260 %/°C Strong top 4% 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 573 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 645 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
-
With bifacial gain
-

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
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR7-72HVDF-645M 645 W 23.90% -0.260 33.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Lighter, +1.3 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +35 W, lighter, +1.3 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +30 W, lighter, +1.1 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Lighter, +1.1 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +50 W, heavier, +1.0 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +25 W, lighter, +0.9 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +25 W, lighter, +0.9 pp
LR8-66HGD-595M 595 W 22.00% -0.280 32.5 kg -50 W, hotter, -1.9 pp
LR7-72HGD-600M 600 W 22.20% -0.280 33.5 kg -45 W, hotter, -1.7 pp
600M 600 W 22.40% -0.280 31.0 kg -45 W, -1.5 pp, -5 yr warranty
LR7-72HTH-605M 605 W 22.40% -0.280 28.5 kg Lighter, -1.5 pp, -5 yr warranty
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +55 W, heavier, +1.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +25 W, lighter, +0.9 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
What is the back contact technology in the Longi Hi-MO X10 Guardian and why does it matter?
In the Hi-MO X10 Guardian, all electrical contacts are moved to the rear side of the cell, leaving the entire front surface free of metal busbars. This maximizes light absorption and supports module efficiency up to 24.8%. Combined with N-type cell technology and a zero-busbar (0BB) structure, the back contact architecture delivers significantly better energy yield than conventional TOPCon or PERC modules of the same size.
What does the anti-dust frame design in the Longi Hi-MO X10 Guardian actually do, and will it reduce cleaning frequency?
The anti-dust frame modifies the edge profile of the glass to reduce dust accumulation along the module perimeter. LONGi states it lowers yield losses from soiling and extends intervals between required cleaning cycles. This is a practical advantage for utility-scale PV farms near roads or industrial facilities and for installations in arid climates with long dry seasons where soiling losses are a major LCOE driver.
How does the Hi-MO X10 Guardian (LR7-72HVDF 640~665M) handle partial shading from chimneys or rooftop obstructions?
The series uses a built-in shading optimizer within its back contact cell architecture. According to LONGi's data, this reduces power loss from partial shading by up to 70% compared to TOPCon modules. The bifacial design further recovers reflected light from the ground or rooftop surface. This makes the series well-suited for C&I roofs with architectural obstacles and for utility projects where inter-row shading occurs during low-sun hours.
What warranty does the Longi Solar Hi-MO X10 Guardian carry, and what power output can be expected after 30 years?
LONGi provides a 15-year product warranty covering materials and workmanship, and a 30-year linear power warranty. First-year degradation is capped at 1%, followed by a 0.35% annual linear degradation rate, guaranteeing at least 88.85% of rated power output at the end of year 30. As a Tier 1 manufacturer, LONGi's warranty is generally considered low-risk for long-term project financing.
How well do the Longi Hi-MO X10 Guardian panels perform in high summer temperatures?
The power temperature coefficient is -0.26%/°C, among the best in the 640–665 Wp module class. For every 10°C rise in module temperature above 25°C, output drops only ~2.6%, compared to ~3.5% for standard PERC modules. The back contact architecture also reduces the risk of localized overheating (hotspots), improving both safety and long-term reliability throughout the module's operating lifetime.
What types of installations are the Longi Hi-MO X10 Guardian 665W modules best suited for, and do they work on large industrial rooftops?
The series is designed primarily for utility-scale PV farms and large C&I rooftop installations. Module dimensions are 2382×1134×30 mm with a weight of approximately 33.5 kg, so structural load capacity and racking design must be verified beforehand. The 665 Wp peak power and high module efficiency reduce the number of modules needed per MW, lowering BoS costs. Built-in resistance to soiling, shading, and hotspots reduces O&M costs over the full 30-year power warranty period.
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