--- title: "Longi Solar LR7-72HYD-635M 635W Solar Panel - Specs & Review | ComparePV" description: "Longi Solar LR7-72HYD-635M 635W solar panel. Specs: 23.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/longi-lr7-72hyd-635m" updated: 2026-09-11 --- # Longi Solar LR7-72HYD-635M Strong in heat, no clear weak spot 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Longi Solar - **Model:** LR7-72HYD-635M - **Series:** Hi-MO 9 LR7-72HYD 625~660M - **Rated power:** 635 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 635 W | 625 W | Strong - top 22% | | | Module efficiency | 23.50% | 22.77% | Strong - top 12% | 716 | | Power density | 235.1 | 227.7 | Strong - top 12% | 741 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 4% | 511 | | Weight (kg) | 33.5 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.50% | 22.77% | Strong - top 12% | 716 | | Power density | 235.1 | 227.7 | Strong - top 12% | 741 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 4% | 511 | | Weight per kWp | 52.8 | 52.7 | Typical | 6,429 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-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. - **235.1 watts per square metre** - Top 12% of the N-type 600-650 W segment, against a median of 227.7. - **23.50% module efficiency** - Top 12% of the N-type 600-650 W segment, against a median of 22.77%. - **Best for:** Utility-scale and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 635 W - **Efficiency:** 23.50 % - **Voltage at Pmax (Vmp):** 44.57 V - **Current at Pmax (Imp):** 14.25 A - **Open-circuit voltage (Voc):** 53.92 V - **Short-circuit current (Isc):** 14.89 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 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.5 kg - **Area:** 2.70 m2 - **Power density:** 235.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 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:** 564 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 716 of 14005 | | Power density | 741 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 6429 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Record 24.4% efficiency via HPBC 2.0** - Back contact cells without front busbars enable a maximum efficiency of 24.4%, matching Canadian Solar TOPBiHiKu6 (24.4%) and clearly outperforming AE Solar AURORA ME-132 (21.27%) and PolyCrown Monocrystalline120 (23.32%). - **Strong partial-shading tolerance (STAC)** - STAC interconnection technology reduces power loss under single-cell shading by more than 70% compared to conventional non-BC modules, meaningfully cutting production losses in installations with uneven irradiance. - **Low temperature coefficient of -0.260%/°C** - The Pmax temperature coefficient of -0.260%/°C beats typical PERC modules (around -0.35%/°C) and many TOPCon designs (around -0.29 to -0.30%/°C), translating into higher yield during high module operating temperatures. - **30-year linear power warranty** - The manufacturer guarantees less than 1% degradation in year one and a maximum of 0.35% per year thereafter, resulting in over 87.4% of nominal power after 30 years - a longer term and better end-point guarantee than the typical 25-year warranties offered by some tier-1 competitors. - **Bankable Tier-1 manufacturer with 25-year track record** - LONGi Solar has operated since 2000 and holds Tier-1 bankable status, easing project financing for utility-scale PV and lowering risk for investors and EPCs compared to less-established brands in the peer set. ## Cons - **Lower bifaciality than TOPCon competitors** - Bifaciality is rated at 75%±5% (up to roughly 80%), while the power- and efficiency-matched Canadian Solar TOPBiHiKu6 (bifacial TOPCon) reaches up to 85%. This is a typical trade-off of back-contact architecture - rear-side metallization limits the potential rear-side energy gain in installations on high-albedo surfaces. ## About this series The Longi Solar Hi-MO 9 LR7-72HYD 625-660M series was designed to maximize yield in PV farms, where power density per hectare and stable performance under real-world conditions are key. Its core feature is the **HPBC 2.0 back-contact cells** - without front busbars for collecting current, more light reaches the silicon directly, and the module looks aesthetically pleasing while delivering higher performance even under weaker sunlight. In practice, the biggest advantage of the Hi-MO 9 is **higher tolerance to partial shading losses**. The current flow architecture in BC, combined with an integrated shading management approach, helps minimize production drops and the risk of localized overheating, which is crucial for installations with uneven irradiance, dirt accumulation, or periodic shading. Additionally, the use of **0BB and advanced passivation** solutions supports reliability and long-term parameter stability. This is the series for investors and EPCs who want **to extract more energy from the same surface area** and stand out with higher yields, rather than just the module price. ## Notable figures - 23.5% module efficiency - 0.7pp better than the \*\*N-type 600-650W\*\* median of 22.8% - Power density of 235.1 W/m² packs 7.4 W/m² more into the same footprint vs \*\*N-type 600-650W\*\* median (227.7 W/m²) - At -0.26%/°C (vs median -0.29%/°C), loses ~1% less power in hot conditions - At 33.5 kg, weight matches the \*\*N-type 600-650W\*\* median - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### What warranty does LONGi Solar offer on the Hi-MO 9 LR7-72HYD 625–660M series? LONGi Solar provides a 12-year product warranty (materials and workmanship) and a 30-year linear power warranty for the Hi-MO 9 LR7-72HYD series. Degradation is capped at less than 1% in year one and no more than 0.35% per year from years 2 through 30, guaranteeing over 87.4% of nominal power at the end of the warranty period. ### What is HPBC 2.0 technology in the LONGi Hi-MO 9 modules and how does it differ from conventional cells? HPBC 2.0 (Hybrid Passivated Back Contact) is an N-type cell design where all current-collecting contacts are moved to the rear — eliminating front-side busbars entirely. This allows more light to reach the silicon directly, pushing module efficiency up to 24.4%. The temperature coefficient of –0.26%/°C is a measurable improvement over first-generation HPBC 1.0 (–0.29%/°C) and most competing technologies. ### Do LONGi Hi-MO 9 LR7-72HYD 660M panels perform well in high summer temperatures? Yes. With a temperature coefficient of –0.26%/°C, the Hi-MO 9 series loses less power as module temperature rises compared to PERC or HPBC 1.0. At a typical operating temperature of 65°C, power loss is roughly 10.4%, versus 14–15% for standard PERC modules. This translates into a measurably higher annual energy yield in warm climates or installations with limited airflow behind the modules. ### Is the Hi-MO 9 LR7-72HYD series bifacial, and how much extra energy can be harvested from rear-side irradiance? Yes, the Hi-MO 9 LR7-72HYD is a bifacial, dual-glass module. The rear side captures irradiance reflected from the ground or rooftop surface. With a typical albedo of 20–30% (light gravel or concrete), bifacial gain can range from 5–15% additional annual production compared to a monofacial module of the same rated power. The gain is most pronounced in ground-mount farms with a bright substrate and an optimized tilt angle. ### What are the dimensions and weight of the LONGi Hi-MO 9 LR7-72HYD 660M — will it fit standard utility-scale mounting systems? The panel measures 2382 × 1134 × 30 mm and weighs 33.5 kg. The footprint matches the Hi-MO 7 form factor, so Hi-MO 9 is compatible with racking systems designed for previous-generation 72-cell modules. The module uses 144 half-cut cells in the 210 mm format. When sizing strings, note the open-circuit voltage (Voc) of 53.30 V for the 660 M variant and verify MPPT input range with your inverter. ### Are LONGi Hi-MO 9 LR7-72HYD panels suitable for installations with partial shading from trees or nearby structures? The busbar-free HPBC 2.0 back contact architecture reduces hot-spot risk and limits the cascade shading losses that affect conventional PERC strings. Compared to standard modules, the Hi-MO 9 is less susceptible to string-level power drops from localized shade. For sites with predictable partial shading, pairing the modules with power optimizers or microinverters will further maximize yield and protect long-term reliability. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/l-gi-le-pm-t-pmd-059-f167-lr-7-72-hyd-625-660-m-v1-30-30-and-edf1f5615625.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +15 W, lighter, +1.7 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +45 W, lighter, +1.7 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +40 W, lighter, +1.5 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +10 W, lighter, +1.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +35 W, lighter, +1.3 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +35 W, lighter, +1.3 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Lighter, +1.3 pp | | [Longi Solar LR8-66HGD-595M](https://comparepv.com/panel/longi-lr8-66hgd-595m) | 595 W | -40 W, hotter, -1.5 pp | | [Longi Solar LR7-72HGD-600M](https://comparepv.com/panel/longi-lr7-72hgd-600m) | 600 W | -35 W, hotter, -1.3 pp | | [Longi Solar 600M](https://comparepv.com/panel/longi-600m) | 600 W | -35 W, -1.1 pp, -5 yr warranty | | [Longi Solar LR7-72HTH-605M](https://comparepv.com/panel/longi-lr7-72hth-605m) | 605 W | Lighter, -1.1 pp, -5 yr warranty | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +65 W, heavier, +1.5 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +60 W, heavier, +1.4 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +35 W, lighter, +1.3 pp | --- Source: https://comparepv.com/panel/longi-lr7-72hyd-635m Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.