--- title: "Longi Solar LR5-72HPH-550M 550W Solar Panel - Specs & Review | ComparePV" description: "Longi Solar LR5-72HPH-550M 550W solar panel. Specs: 21.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr5-72hph-550m" updated: 2026-09-11 --- # Longi Solar LR5-72HPH-550M Light for its output, short guarantee 589 panels in the segment PERC 550-600 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR5-72HPH-550M - **Series:** Hi-MO 5m (G2) - **Rated power:** 550 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 550-600 W (589 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 550 W | 560 W | Weak - bottom 15% | | | Module efficiency | 21.30% | 21.29% | Typical | 8,519 | | Power density | 212.9 | 212.9 | Typical | 8,497 | | Temperature coefficient | -0.340 | -0.350 | Typical | 8,778 | | Weight (kg) | 27.5 kg | 30.8 kg | Strong - top 23% | | | Performance warranty | 25 yrs | 27 yrs | Weak - bottom 24% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.30% | 21.29% | Typical | 8,519 | | Power density | 212.9 | 212.9 | Typical | 8,497 | | Temperature coefficient | -0.340 | -0.350 | Typical | 8,778 | | Weight per kWp | 50.0 | 52.7 | Strong - top 23% | 3,298 | | Performance warranty | 25 yrs | 27 yrs | Weak - bottom 24% | 9,798 | ### Strengths - **50.0 kg per kWp** - Top 23% of the PERC 550-600 W segment, against a median of 52.7. ### Watch out for - **25 year performance warranty** - Bottom 24% of the PERC 550-600 W segment, against a median of 27 yrs. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 550 W - **Efficiency:** 21.30 % - **Voltage at Pmax (Vmp):** 41.95 V - **Current at Pmax (Imp):** 13.12 A - **Open-circuit voltage (Voc):** 49.80 V - **Short-circuit current (Isc):** 13.98 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.265 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 27.5 kg - **Area:** 2.58 m2 - **Power density:** 212.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 451 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8519 of 14005 | | Power density | 8497 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 3298 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Low power degradation via gallium doping** - Gallium-doped PERC cells limit LID to below 1.5% in the first year, with only 0.4% annual degradation thereafter, translating to roughly 88% of nominal power retained after 25 years of operation. - **Tier-1 manufacturer with 25 years of track record** - Longi Solar has operated since 2000 and is classified as bankable Tier-1, easing project financing and increasing confidence in long-term warranty support compared to less established brands. - **Efficiency matching segment leaders in PERC** - Maximum efficiency of 21.9% ties the top comparable module, JA Solar DeepBlue 3.0 Pro (21.9%), and exceeds Vikram Solar PREXOS and Paradea (21.87%), despite relying on proven PERC rather than pricier N-type cells. - **Segmented ribbons via Smart Soldering** - Smart Soldering technology reduces mechanical stress on cells during thermal cycling, lowering the risk of microcracks and power loss over the module's operating life — relevant in climates with large seasonal temperature swings. - **Wide power range and aesthetic all-black variants** - 12 variants spanning 405-565 Wp, plus available all-black versions, allow the module to fit both small pitched residential roofs and larger C&I installations without aesthetic compromise. ## Cons - **Efficiency capped by PERC technology** - PERC-based modules top out at 21.9% efficiency, while Longi's newer generation (Hi-MO X10, HPBC 2.0) already reaches 23-24%+, and competing N-type TOPCon panels offer a better temperature coefficient and lower long-term degradation. - **25-year power warranty shorter than some peers** - The linear power warranty runs 25 years with a 12-year product warranty, whereas JA Solar DeepBlue 3.0 Pro offers up to 30 years of power warranty under the same 12-year product warranty term, making Longi's offer less competitive on long-term investment security. - **No bifacial variant available** - The series is offered only in monofacial form, ruling out the additional energy gain (typically 5-10%) that bifacial panels — available from some competitors in this power segment — deliver on ground-mount or high-albedo roof installations. ## About this series The Longi Solar Hi-MO 5m (G2) series was designed with rooftop installations in mind, where high energy yield, aesthetics, and hassle-free installation are equally important. These modules are based on **monocrystalline PERC solar cells doped with gallium**, effectively reducing light-induced degradation (LID) and helping maintain stable performance over the long term. In practice, this means less disappointment in subsequent seasons and more predictable savings. What stands out in this series is **Smart Soldering - segmented soldering tapes**, which better manages stresses in the cells and improves reliability during daily temperature fluctuations. Additionally, **optimized electrical parameters** simplify equipment selection-modules work well with popular inverters and MLPE devices (e.g., optimizers, string inverters). The Hi-MO 5m (G2) is a good choice for homes, micro-installations, and smaller C&I roofs, especially when a **compact format** and **aesthetic appearance (including all-black variants)** are important, while simultaneously expecting high performance in weaker morning, evening, and less-than-ideal light incidence angles. ## Notable figures - At 21.3% efficiency, this panel is on par with typical \*\*PERC 550-600W\*\* modules - At 212.9 W/m² power density, roof space requirements are typical for \*\*PERC 550-600W\*\* panels - At -0.34%/°C, hot weather performance is typical for \*\*PERC 550-600W\*\* panels - 27.5 kg weight - 3.3 kg lighter than \*\*PERC 550-600W\*\* median (30.8 kg), reducing installation effort - In the top 61% for efficiency among all PERC panels ## Questions ### What is the warranty on Longi Solar Hi-MO 5m (G2) panels? Longi Solar provides a 12-year product warranty and a 25-year linear power output warranty for the Hi-MO 5m (G2) series. The power warranty guarantees that the panels retain a specified percentage of their rated output over the full 25-year period — a standard offering from a Tier 1 manufacturer of this caliber. Keep all warranty documents together with the installer invoice. ### Are Longi Hi-MO 5m (G2) panels suitable for a pitched residential roof? Yes, the Hi-MO 5m (G2) series was designed with rooftop installations in mind. The compact module format simplifies mounting on standard racking systems, and the all-black variant blends seamlessly with dark roof tiles. The 144 half-cut cell layout improves shading tolerance, which matters on roofs with chimneys, dormers, or other obstructions that cause partial shading. ### What is Smart Soldering technology in the Hi-MO 5m (G2) and why does it matter? Smart Soldering refers to the segmented soldering ribbons used in the Hi-MO 5m (G2) series. They distribute mechanical stress that builds up during daily thermal cycling — the module heating up and cooling down. This reduces the risk of microcracks in the cells, resulting in higher long-term reliability, especially in climates with wide temperature swings between seasons. ### What is the maximum power of the Longi Hi-MO 5m (G2) and is an all-black version available? The top power rating in the Hi-MO 5m (G2) series is 565 Wp. The series also includes all-black variants with a black frame and black backsheet, significantly improving the visual appearance of installations on dark roof coverings. Check with your local distributor for current availability of specific color variants, as lead times may differ. ### Why are Hi-MO 5m (G2) cells gallium-doped and how does it affect long-term degradation? Gallium doping in the PERC cells of the Hi-MO 5m (G2) series effectively suppresses LID (Light-Induced Degradation), a phenomenon that causes power loss in conventional boron-doped cells within the first weeks of operation. In practice, the panel stabilizes at its rated output faster and loses less energy over its entire service life, improving the overall LCOE of the installation. ### Are Longi Hi-MO 5m (G2) panels compatible with power optimizers and microinverters? Yes, the optimized electrical parameters of the Hi-MO 5m (G2) series make it straightforward to pair with MLPE devices such as power optimizers and microinverters from major manufacturers. The modules also work well with standard string inverters. Before purchasing, verify that your chosen inverter's MPPT voltage range matches the specifications listed in the datasheet for your specific wattage variant. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Hi-MO-5m-L-Gi-LE-PM-T-PMD-059-F119-LR-5-72-HPH-545-565-M-G2-9f020893a5a0.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +3.7 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, +3.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, +3.4 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | -50 W, cooler, +3.2 pp | | [Longi Solar RL530HM](https://comparepv.com/panel/longi-solar-rl530hm) | 530 W | -20 W, hotter, -0.6 pp | | [Longi Solar RL535HM](https://comparepv.com/panel/longi-solar-rl535hm) | 535 W | -15 W, hotter, -0.4 pp | | [Longi Solar LR5-72HBD-540M](https://comparepv.com/panel/longi-lr5-72hbd-540m) | 540 W | Heavier, -0.4 pp, +5 yr warranty | | [Longi Solar RL540HM](https://comparepv.com/panel/longi-solar-rl540hm) | 540 W | -10 W, hotter | | [Longi Solar LR5-72HPH-545M](https://comparepv.com/panel/longi-lr5-72hph-545m) | 545 W | Very close match | | [Longi Solar RL545HM](https://comparepv.com/panel/longi-solar-rl545hm) | 545 W | Hotter | | [Longi Solar RL550HM](https://comparepv.com/panel/longi-solar-rl550hm) | 550 W | Hotter | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +100 W, cooler, +3.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +95 W, cooler, +3.7 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +85 W, cooler, +3.3 pp | --- Source: https://comparepv.com/panel/longi-lr5-72hph-550m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.