--- title: "Hounen Solar HNM7-UHLDD156-615/M 615W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM7-UHLDD156-615/M 615W solar panel. Specs: 22.00% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm7-uhldd156-615-m" updated: 2026-09-11 --- # Hounen Solar HNM7-UHLDD156-615/M Middle of its segment, needs the roof space 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM7-UHLDD156-615/M - **Series:** HNM7-UHLDD156 - **Rated power:** 615 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) | 615 W | 625 W | Typical | | | Module efficiency | 22.00% | 22.77% | Weak - bottom 7% | 6,517 | | Power density | 220.0 | 227.7 | Weak - bottom 6% | 6,655 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight (kg) | 34.0 kg | 32.5 kg | Weak - bottom 17% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.00% | 22.77% | Weak - bottom 7% | 6,517 | | Power density | 220.0 | 227.7 | Weak - bottom 6% | 6,655 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight per kWp | 55.3 | 52.7 | Weak - bottom 17% | 9,727 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **220.0 watts per square metre** - Bottom 6% of the N-type 600-650 W segment, against a median of 227.7. Ranked 6,655th in the whole database. - **22.00% module efficiency** - Bottom 7% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 6,517th in the whole database. - **-0.300 %/°C temperature coefficient** - Bottom 11% of the N-type 600-650 W segment, against a median of -0.290. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Roofs where every square metre has to count, tight roof space and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 615 W - **Efficiency:** 22.00 % - **Voltage at Pmax (Vmp):** 45.90 V - **Current at Pmax (Imp):** 13.40 A - **Open-circuit voltage (Voc):** 55.30 V - **Short-circuit current (Isc):** 14.16 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 34.0 kg - **Area:** 2.80 m2 - **Power density:** 220.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 538 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6517 of 14005 | | Power density | 6655 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 9727 of 14005 | | Warranty | 21 of 14005 | ## Pros - **30-year linear power warranty** - Hounen guarantees a linear output for 30 years, whereas direct peer comparables — Jinko Tiger Neo 66HL4M-BDV and Canadian Solar TOPBiHiKu6 Anti-Dust — ship with a standard 25-year performance warranty. The extended horizon lowers LCOE and improves bankability for debt-financed projects. - **N-type cell technology with 16BB half-cut** - N-type cells exhibit LID degradation close to 0% (vs. 0.5–1% annually for PERC), and 16 busbars shorten the current path, cutting resistive losses by ~2% compared to standard 9BB configurations. Independent testing shows N-type TOPCon bifacial modules generate an average of 1.5–2.5% more annual energy yield than comparable PERC. - **Bifacial double glass + IP68** - The double-glass bifacial design captures rear-side yield (5–15% depending on ground albedo), eliminates EVA yellowing, and extends mechanical service life. An IP68-rated junction box with resistance to salt, ammonia, and sand makes the series a solid fit for agriPV, port-side, and industrial rooftop installations. - **High unit power ≥610 Wp** - The 610–630 Wp range matches the highest-rated peer comparables (Jinko, Canadian Solar). In C&I and utility-scale segments, higher Wp-per-panel directly reduces BoS costs: fewer mounting points, less cabling, and shorter installation time for the same MW capacity. ## Cons - **Module efficiency below peers** - The series peaks at 22.54% efficiency, while Jinko Tiger Neo 66HL4M-BDV reaches 23.32% and Canadian Solar TOPBiHiKu6 Anti-Dust reaches 23.3%. The 0.78 pp gap (~3.5% relative) translates to a real yield penalty on space-constrained rooftops or ground-mount sites; for a 1 MWp project, the competing modules require roughly 340 m² less area. - **Weaker temperature coefficient** - The declared Pmax temperature coefficient is –0.35%/°C, while Jinko Tiger Neo and Canadian Solar TOPBiHiKu6 achieve –0.29%/°C. At a typical summer cell temperature of 70°C (Δ = 30°C above STC), the HNM7-UHLDD156 loses ~1.8% more power relative to those competitors — a meaningful disadvantage for industrial rooftop installs and warm climates. - **No BNEF Tier 1 status** - Hounen Solar does not appear on the BloombergNEF Tier 1 list as of Q1 2026. In utility-scale projects financed by banks or infrastructure funds, manufacturer bankability is a standard due-diligence requirement. The absence of Tier 1 status may disqualify the series from tenders that require production insurance or bank guarantees. ## About this series The HNM7-UHLDD156 series comprises photovoltaic modules built using **N-type monocrystalline silicon** technology, featuring an advanced **16-busbar (16BB)** design that significantly reduces the distance between the busbars and the finger grid - resulting in a marked increase in energy yield compared to conventional cells. The bifacial panels with **tempered double glass (Double Glass)** construction capture additional energy reflected from the ground, with the actual rear-side gain depending on the albedo coefficient of the installation's surroundings. Thanks to their **PID resistance** and sealed IP68 connector housing, the modules perform excellently in demanding climatic conditions - salt, ammonia, sand, high humidity, and wide temperature fluctuations do not adversely affect their long-term durability. The series also stands out for its **improved response to low irradiance** - fog, cloud cover, or early morning hours are conditions in which the HNM7-UHLDD156 continues to generate electricity efficiently. This makes it an ideal solution both for large commercial and industrial installations and for demanding investors who value reliability backed by a 30-year power warranty. ## Notable figures - Module efficiency of 22.0% is 0.8pp below average for \*\*N-type 600-650W\*\* panels (median: 22.8%) - Power density of 220.0 W/m² is 7.7 W/m² below \*\*N-type 600-650W\*\* median (227.7 W/m²) - needs more roof space - At -0.30%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - At 34.0 kg, this panel is 1.5 kg heavier than the \*\*N-type 600-650W\*\* median (32.5 kg) - more demanding for installation crews - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### How does the N-type cell technology in the HNM7-UHLDD156 series compare to standard PERC modules? N-type cells in the HNM7-UHLDD156 series are free of the LID (Light Induced Degradation) effect that causes standard PERC modules to lose 1–2% of output right after commissioning. They also achieve efficiency of around 22.5% and exhibit lower long-term degradation rates. In practice, this means better-retained performance across the full 30-year power warranty period and higher energy yield per square meter of installed area. ### How much extra energy does the bifacial design of the HNM7-UHLDD156 actually generate — is it worth the investment? The actual bifacial gain depends on the albedo of the surface beneath the array. Light-colored surfaces such as concrete, gravel, or snow can yield a 5–15% boost from the rear side. Grass or dark rooftops typically deliver 3–8%. For ground-mounted installations with reflective ground cover, the bifacial HNM7-UHLDD156 clearly outperforms monofacial modules, shortening the investment payback period. ### What warranty does the Hounen Solar HNM7-UHLDD156 come with, and what exactly does it cover? The HNM7-UHLDD156 series includes a 12-year product warranty covering materials and workmanship, plus a 30-year linear power warranty guaranteeing the module retains a specified minimum percentage of its rated output over three decades. This is one of the longest power warranty standards in its class and is an important factor when calculating the return on investment for commercial projects. ### Will the HNM7-UHLDD156 630W panel perform well in overcast and low-irradiance conditions? Yes. The HNM7-UHLDD156 is engineered for strong low-light response — it generates power effectively in fog, heavy cloud cover, and diffuse morning irradiance typical of Central European climates. The N-type cell architecture combined with the 16-busbar (16BB) layout minimizes resistive losses under low irradiance, delivering higher annual energy yield compared to equivalent PERC modules in similar weather conditions. ### Are the HNM7-UHLDD156 modules suitable for large commercial rooftop or utility-scale ground-mount installations? Yes. At 630 Wp with N-type cells and double-tempered glass, the HNM7-UHLDD156 is well suited for commercial and utility-scale projects. The IP68-rated junction box and resistance to salt mist, ammonia, and sand ensure durability in demanding locations. The high module efficiency reduces the required land or roof footprint, directly lowering balance-of-system (BoS) costs per kWp installed. ### Are the HNM7-UHLDD156 panels resistant to PID and extreme weather conditions? Yes. The HNM7-UHLDD156 series has confirmed resistance to PID (Potential Induced Degradation), which can significantly reduce output in high-voltage string configurations. The IP68-rated junction box seals out water, salt spray, ammonia, and sand. The double-tempered glass construction provides additional mechanical strength, allowing the module to handle high snow and wind loads in harsh climates. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767944211319244-f59d709a923b.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.8 pp | | [Longi Solar LR8-66HVD-665M](https://comparepv.com/panel/longi-lr8-66hvd-665m) | 665 W | +50 W, cooler, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (665W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-665w-class) | 665 W | +50 W, cooler, +2.6 pp | | [Huayao HY665-B144DSS](https://comparepv.com/panel/huayao-hy665-b144dss) | 665 W | +50 W, lighter, +2.6 pp | | [Sunpro Power SPDG665-BC132R12](https://comparepv.com/panel/sunpro-spdg665-bc132r12) | 665 W | +50 W, cooler, +2.6 pp | | [Hounen Solar HNM7-SHLDD156-585/M](https://comparepv.com/panel/hounen-solar-hnm7-shldd156-585-m) | 585 W | -30 W, hotter, -1.1 pp | | [Hounen Solar HNM7-SHLDD156-590/M](https://comparepv.com/panel/hounen-solar-hnm7-shldd156-590-m) | 590 W | -25 W, hotter, -0.9 pp | | [Hounen Solar HNM7-SHLDD156-595/M](https://comparepv.com/panel/hounen-solar-hnm7-shldd156-595-m) | 595 W | -20 W, hotter, -0.7 pp | | [Hounen Solar HNM7-SHLDD156-600/M](https://comparepv.com/panel/hounen-solar-hnm7-shldd156-600-m) | 600 W | -15 W, hotter, -0.5 pp | | [Hounen Solar HNM7-SHLDD156-605/M](https://comparepv.com/panel/hounen-solar-hnm7-shldd156-605-m) | 605 W | -10 W, hotter, -0.4 pp | | [Hounen Solar HNM7-UHLDD156-610/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd156-610-m) | 610 W | Very close match | | [Hounen Solar HNM7-UHLDD156-620/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd156-620-m) | 620 W | Very close match | | [Hounen Solar HNM7-UHLDD156-625/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd156-625-m) | 625 W | +10 W, +0.4 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +65 W, lighter, +3.2 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm7-uhldd156-615-m 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.