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Longi Solar LR5-72HBD-550M
Longi Solar Brand review

LR5-72HBD-550M

550 Wp Monocrystalline Bifacial 70%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 6,980 of 14,005
Compare panels Datasheet PDF
Power (Wp)
550
Typical for its class
Efficiency (%)
21.30
Typical · median 22.30%
Density (Wp/m²)
212.9
Typical · median 223.0
Temp (%/°C)
-0.340
Weak · bottom 23%
Weight (kg)
31.8
Weak · 3.3 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

Longi Solar Hi-MO 5 series panels are a breakthrough solution based on M10 standard silicon wafers, which set new efficiency limits in utility-scale installations and modern commercial systems. Thanks to the use of gallium-doped technology, these modules effectively eliminate the problem of light-induced degradation (LID), which directly translates into stable energy production and a longer lifespan for the entire power plant. Innovative smart segmented soldering allows for the minimization of internal stresses, which drastically reduces the risk of micro-cracks in the cell structure. This series solves the key problem of high Balance of System (BOS) costs - the optimal module size allows for maximum use of the mounting surface while reducing expenditures on cabling and support structures. The use of PERC cells in a Half-Cut architecture ensures that the panels exhibit excellent resistance to high temperatures and work more efficiently in diffused light conditions. Compared to the competition, Hi-MO 5 stands out with the precise matching of electrical parameters to the latest inverters, making them the most cost-effective choice in terms of LCOE for demanding investors. It is a solid foundation for projects where the priority is reliability and maximizing yields from every installed kilowatt of power in Polish solar conditions.

Ranking

7,481 panels in the 450-650 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.30% 22.30% Typical 8,519
Power density 212.9 223.0 Typical 8,497
Temperature coefficient -0.340 -0.292 Weak · bottom 23% 8,778
Weight per kWp 57.8 52.7 Weak · bottom 11% 11,439
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

4 positive · 5 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Weight-limited structures and hot climates.

Watch-outs
57.8 kg per kWp

Bottom 11% of the 450-650 W band, against a median of 52.7.

-0.340 %/°C temperature coefficient

Bottom 23% of the 450-650 W band, against a median of -0.292.

What owners get
Gallium doping eliminates LID

P-type gallium-doped wafers effectively eliminate light-induced degradation (LID), confirmed by the manufacturer's 98% first-year power warranty and a linear annual degradation of only 0.45% - translating to roughly 85% guaranteed power after 30 years.

Dual-glass bifacial design, 5400 Pa rating

Dual-glass bifacial construction delivers additional rear-side energy yield and withstands up to 5400 Pa frontside static load without a rear crossbeam, eliminating shading losses from mounting hardware.

Half-cut PERC with 9BB Smart Soldering

The half-cut cell architecture combined with 9-busbar smart soldering interconnect technology minimizes internal cell stress, reducing microcrack risk and improving performance under diffuse light and high-temperature conditions.

Tier-1 bankable manufacturer since 2000

Longi Solar has operated since 2000 and is classified as a Tier-1 bankable manufacturer, lowering counterparty risk for large-scale project financing - a meaningful advantage over less established brands in the same power segment, such as Exiom or Fellow Energy.

Trade-offs
Discontinued - series retired from lineup

Hi-MO 5 was manufactured from 2020 to 2023 and has been discontinued in favor of the newer Hi-MO 6, 7, 9 and X10 series. This limits availability of identical replacement modules for existing installations and can extend timelines for warranty or service claims.

PERC technology trails newer N-type modules

Longi's own series comparison states that newer N-type (TOPCon/HPBC) modules in the Hi-MO 6/7/9/X10 lines outperform Hi-MO 5 in efficiency, temperature coefficient, degradation and long-term durability - a real technological limitation for new investments.

Efficiency on par with, not above, peer comparables

The 21.7% maximum efficiency matches Exiom (EX540-560M) and Fellow Energy (FE72-18X) and is close to Premier Energies (21.67%), meaning the series does not stand out electrically against lower-cost competitors in the same 540-560 Wp power class.

Notes from the database
  • At 21.3% efficiency, this panel is 0.5pp below the database median of 21.8%
  • 212.9 W/m² power density is 5.2 W/m² below database median (218.1 W/m²) - requires larger installation area
  • -0.34%/°C temperature coefficient - 0.04pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • At 31.8 kg (5.3 kg above database median of 26.5 kg), requires checking roof load capacity
  • Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 550 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.30 % Typical Segment median 22.30%
Vmpp · Impp 41.95 V · 13.12 A Operating point at max power
Voc · Isc 49.80 V · 13.99 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2278×1134×30 mm · 2.58 m² of roof
Weight 31.8 kg Weak Weak · 3.3 kg above median
Cells 144 Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.340 %/°C Weak bottom 23% of its segment
Coefficient Voc · Isc -0.265 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 467 W guaranteed
Degradation 2.00 → 0.45 % First year, then annual

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
-0.340 %/°C against a segment median of -0.292
-
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 LR5-72HBD-550M 550 W 21.30% -0.340 31.8 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.7 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, lighter, +3.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +3.4 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg Cooler, lighter, +3.3 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +3.2 pp
RL530HM 530 W 20.70% -0.470 27.0 kg Hotter, lighter, -5 yr warranty
RL535HM 535 W 20.90% -0.470 27.0 kg Hotter, lighter, -5 yr warranty
LR5-72HBD-540M 540 W 20.90% -0.340 31.8 kg -10 W, -0.4 pp
RL540HM 540 W 21.10% -0.470 27.0 kg Hotter, lighter, -5 yr warranty
LR5-72HPH-545M 545 W 21.10% -0.340 27.5 kg Lighter, -5 yr warranty
RL545HM 545 W 21.30% -0.470 27.0 kg Hotter, lighter, -5 yr warranty
RL550HM 550 W 21.50% -0.470 27.0 kg Hotter, lighter, -5 yr warranty
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +100 W, cooler, +3.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +95 W, cooler, +3.7 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +90 W, cooler, +3.5 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg +85 W, cooler, +3.3 pp

Found 2326 panels of the same or similar size to this one, within ±10 mm. See them here Found 2368 panels of the same or similar size to this one, within ±25 mm. See them here Found 2382 panels of the same or similar size to this one, within ±50 mm. See them here Found 2547 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Longi Solar Hi-MO 5 come with and what does it cover?
LONGi provides a 12-year product warranty and a 30-year linear power output warranty on Hi-MO 5 modules. Annual degradation is capped at 0.45%, with a guaranteed output of at least 98% of rated power after year one. For a 560 Wp module, this means the panel should still produce over 430 Wp after three decades. LONGi's Tier 1 manufacturer status reduces the counterparty risk associated with long-term warranty claims.
What is gallium doping in the Hi-MO 5 and why does it matter for long-term energy yield?
Conventional boron-doped silicon cells suffer light-induced degradation (LID) — a power loss during the first hours of sunlight exposure. LONGi replaced boron with gallium in the Hi-MO 5 wafers, effectively eliminating LID. The practical result is that the module does not lose several percent of rated power in its first week of operation, giving the entire 30-year project lifecycle a higher production baseline. For utility-scale PV plants, this translates into a measurably higher cumulative energy yield.
Is the Longi Hi-MO 5 a bifacial module and how much additional energy output can I realistically expect?
Yes, the Hi-MO 5 is available in a bifacial dual-glass configuration. The rear side captures reflected irradiance (albedo) from the surface below the array. Real-world bifacial gain ranges from 5 to 20%, depending on ground albedo: white gravel, light-colored membranes, or snow-covered ground outperform dark roofing materials. For ground-mount systems with a reflective surface, bifacial gain meaningfully improves the LCOE compared with standard monofacial modules.
Is a 560 Wp Hi-MO 5 panel compatible with popular string inverters available in Europe?
Yes. Hi-MO 5 modules operate at approximately 13 A, which is intentionally matched to the MPPT input range of mainstream string inverters from SMA, Fronius, Huawei, and SolarEdge. The open-circuit voltage fits within the standard 1000 V and 1500 V DC input limits, so no non-standard electrical design is required. You should still verify the number of modules per string against the specific inverter's datasheet before finalizing the system design.
How does the Hi-MO 5 M10 wafer format reduce Balance of System (BoS) costs in large installations?
The M10 wafer format (182 mm) allows LONGi to fit 144 half-cut PERC cells into a single module measuring approximately 2256 × 1134 mm at up to 560 Wp. Fewer modules are needed per megawatt compared with older, smaller formats, which directly cuts BoS costs: shorter DC cable runs, fewer MC4 connectors, less racking hardware, and reduced installation labor. In commercial and utility-scale projects above 100 kWp, these BoS savings can offset a higher per-watt module price.
Is the Longi Solar Hi-MO 5 series still available for purchase?
The Hi-MO 5 series has been officially discontinued by LONGi Solar. It has been superseded by newer generations, including the Hi-MO 6 and Hi-MO X lines featuring HPDC technology and higher cell efficiencies. Some units may still be found in distributor stock in European markets, but supply continuity and active product support are no longer guaranteed. For new installations, it is advisable to consider a current equivalent from LONGi's active product portfolio.
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