--- title: "Hounen Solar HNM7-UHLDD108-435/M 435W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM7-UHLDD108-435/M 435W solar panel. Specs: 22.28% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-435-m" updated: 2026-09-11 --- # Hounen Solar HNM7-UHLDD108-435/M Space saver, heavy for its output 321 panels in the segment N-type 400-450 W ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM7-UHLDD108-435/M - **Series:** HNM7-UHLDD108 - **Rated power:** 435 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 400-450 W (321 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 435 W | 430 W | Typical | | | Module efficiency | 22.28% | 21.91% | Strong - top 24% | 5,403 | | Power density | 222.8 | 218.3 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,093 | | Weight (kg) | 24.5 kg | 22.0 kg | Weak - bottom 15% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.28% | 21.91% | Strong - top 24% | 5,403 | | Power density | 222.8 | 218.3 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,093 | | Weight per kWp | 56.3 | 51.2 | Weak - bottom 15% | 10,568 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **222.8 watts per square metre** - Top 17% of the N-type 400-450 W segment, against a median of 218.3. - **22.28% module efficiency** - Top 24% of the N-type 400-450 W segment, against a median of 21.91%. ### Watch out for - **56.3 kg per kWp** - Bottom 15% of the N-type 400-450 W segment, against a median of 51.2. - **-0.300 %/°C temperature coefficient** - Bottom 25% of the N-type 400-450 W segment, against a median of -0.290. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Weight-limited structures and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 435 W - **Efficiency:** 22.28 % - **Voltage at Pmax (Vmp):** 32.10 V - **Current at Pmax (Imp):** 13.56 A - **Open-circuit voltage (Voc):** 38.60 V - **Short-circuit current (Isc):** 14.32 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:** 108 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.5 kg - **Area:** 1.95 m2 - **Power density:** 222.8 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:** 380 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5403 of 14005 | | Power density | 5150 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 10568 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type 16BB SMBB half-cut cells** - N-type cells deliver ~0.4%/year degradation vs. ~0.7%/year for PERC technology, are free of LID, and achieve a superior temperature coefficient (~-0.30%/°C Pmax). The 16BB SMBB architecture with 108 half-cut cells reduces resistive losses and improves partial-shading tolerance. - **Bifacial design with double glass** - Dual-side energy harvest delivers up to 25% additional rear-side power gain (at 20–40% ground albedo), while the dual tempered glass construction with AR coating eliminates backsheet delamination risk and provides superior mechanical strength compared to standard glass-backsheet modules. - **30-year linear power warranty** - Hounen guarantees ≥87.4% of rated output after 30 years, equivalent to ~0.40%/year degradation. The industry standard is 25 years (JA Solar, Trina Solar, LONGi), making this 30-year warranty a genuine LCOE advantage for long-horizon investments. - **Up to 22.53% efficiency — top-peer level** - The highest-power variant reaches 22.53% module efficiency, matching the Seraphim Nebula series peak (22.53%) and exceeding KDM Kingdom Solar KDM Series (22.50%) within the same sub-440 Wp N-type 108-cell segment. This places the series in the upper quartile of residential-scale module efficiency. - **Built-in PID protection and environmental certifications** - The manufacturer includes full PID resistance and certifications covering salt mist, ammonia, and sand abrasion (typically per IEC 61701, IEC 62716, IEC 60068-2-68), making the series suitable for agri-PV installations and coastal environments. ## Cons - **Not on BNEF Tier 1 list** - Hounen Solar does not appear on the BloombergNEF Tier 1 Solar Module Manufacturers list (Q1 2026), which most banks require for non-recourse financing of commercial projects above 1 MWp. For residential prosumer installations this is irrelevant, but for C&I and utility-scale segments the absence of bankability status may complicate project financing. - **12-year product warranty** - The equipment defect warranty covers only 12 years, while premium manufacturers (REC Group, Panasonic, SunPower, Silfab) offer 25-year product warranties and a growing share of mid-tier producers now provide 15 years. A 12-year term is the lower boundary of current market norms and may be a risk factor when reselling installations in a 15–20-year horizon. - **Efficiency below peer leader** - The series peaks at 22.53% efficiency, which is 0.33 percentage points below Luxor Solar ECO LINE N-TYPE TOPCON NON-REFLECT (22.86%) at the same maximum power of 440 Wp. On a 30 m² rooftop, this gap translates to roughly 2–3 Wp of lost output per module compared to the highest-efficiency direct peer. ## About this series The HNM7-UHLDD108 series consists of advanced photovoltaic modules built on **N-TYPE monocrystalline cell technology** with a bifacial construction and dual glass. Thanks to the **16BB SMBB architecture with half-cut cells** (Half-Cell), the panels minimize resistive losses and increase energy yield even under partial shading. The bifacial design allows the modules to absorb radiation reflected from the ground, delivering up to 25% additional power gain from the rear side - depending on ground albedo. **Enhanced low-irradiance response** allows the modules to operate efficiently under cloud cover, morning fog, and diffuse light conditions, which is particularly relevant in the Polish climate. The series features built-in **PID protection** as well as resistance to extreme environmental conditions - salt, ammonia, sand, high temperature, and humidity. The dual glass with an anti-reflective (AR) coating ensures long-term durability of the installation. The entire series is backed by a **30-year linear power output warranty**, making these panels a solid choice for both residential investments and demanding commercial installations focused on maximum return on investment. ## Notable figures - At 22.3% efficiency, this panel is on par with typical \*\*N-type 400-450W\*\* modules - 222.8 W/m² power density - 4.5 W/m² more than \*\*N-type 400-450W\*\* median (218.3 W/m²), more power per roof area - At -0.30%/°C, hot weather performance is typical for \*\*N-type 400-450W\*\* panels - At 24.5 kg (2.5 kg above \*\*N-type 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranty does the Hounen Solar HNM7-UHLDD108 series come with? The HNM7-UHLDD108 series comes with a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. The linear degradation schedule guarantees predictable performance over three decades, making long-term ROI calculations straightforward for both residential and commercial PV projects. ### How does the N-type cell technology in the HNM7-UHLDD108 differ from standard PERC modules? The N-type cells used in the HNM7-UHLDD108 series offer inherently higher resistance to light-induced degradation (LID) and a lower temperature coefficient than P-type PERC cells. This translates to a module efficiency of up to 22.53% and better output retention on hot days when panel operating temperature rises significantly. The superior longevity of N-type cells is a key advantage over a 30-year operational horizon. ### How much extra energy does the bifacial HNM7-UHLDD108 generate from its rear side? Thanks to its bifacial design and double-glass construction, the HNM7-UHLDD108 can capture light reflected from the ground surface, generating up to 25% additional power from the rear side. Real-world bifacial gain depends on substrate albedo: light gravel, concrete, or white roofing membranes deliver the best results. Ground-mounted systems and flat rooftops with reflective surfaces benefit most from this feature. ### Do the Hounen Solar HNM7-UHLDD108 panels perform well in overcast or low-irradiance conditions? Yes. The HNM7-UHLDD108 series features a 16BB SMBB half-cut cell architecture that minimizes resistive losses and improves energy yield under diffuse light. N-type technology provides a better low-light response compared to PERC modules. The panels are tested for operation in high-humidity and foggy conditions, making them well-suited for climates with frequent overcast skies. ### Is the HNM7-UHLDD108 series resistant to salt mist, ammonia, and hail? Yes. The HNM7-UHLDD108 modules are certified for resistance to salt mist, ammonia, and sand, qualifying them for industrial, agricultural, and coastal environments. The double-glass construction with an AR-coated front surface eliminates laminate delamination risk and provides structural protection for the cells. The series has undergone rigorous hail stress testing per PVEL standards, with results independently verified by laboratory testing. ### What is the maximum power output of the HNM7-UHLDD108 panel and what installations is it designed for? The HNM7-UHLDD108 series reaches a peak power of 440 Wp with module efficiency up to 22.53%. It is designed for residential rooftop installations as well as larger commercial and utility-scale projects. The 440 Wp output in a compact 108-cell format means a manageable physical size that simplifies logistics and installation on rooftops where usable surface area is limited. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767943917814966-822cc1b3e2ac.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +50 W, lighter, +2.0 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +50 W, cooler, +2.0 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +50 W, cooler, +2.0 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +50 W, cooler, +2.0 pp | | [Hounen Solar HNM7-SHDB108-395/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-395-m) | 395 W | Hotter, -2.1 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB108-400/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-400-m) | 400 W | Hotter, -1.8 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB108-405/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-405-m) | 405 W | Hotter, -1.5 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB108-410/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-410-m) | 410 W | Hotter, -1.3 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB108-415/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-415-m) | 415 W | Hotter, -1.0 pp, -5 yr warranty | | [Hounen Solar HNM7-UHLDD108-420/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-420-m) | 420 W | -15 W, -0.8 pp | | [Hounen Solar HNM7-UHLDD108-425/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-425-m) | 425 W | -10 W, -0.5 pp | | [Hounen Solar HNM7-UHLDD108-430/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-430-m) | 430 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +75 W, cooler, +2.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +60 W, cooler, +2.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +70 W, cooler, +2.4 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-435-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.