--- title: "Hounen Solar HNM7-SHDB108-400/M 400W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM7-SHDB108-400/M 400W solar panel. Specs: 20.48% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm7-shdb108-400-m" updated: 2026-09-11 --- # Hounen Solar HNM7-SHDB108-400/M Middle of its segment, short guarantee 6,519 panels in the 300-500 W band, all technologies ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM7-SHDB108-400/M - **Series:** HNM7-SHDB 108 Series - **Rated power:** 400 W - **Cell technology:** Monocrystalline ## How it compares Compared against 300-500 W band, all technologies (6519 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 24% | | | Module efficiency | 20.48% | 21.30% | Typical | 11,468 | | Power density | 204.8 | 212.6 | Typical | 11,370 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 23% | 10,419 | | Weight (kg) | 20.5 kg | 22.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.48% | 21.30% | Typical | 11,468 | | Power density | 204.8 | 212.6 | Typical | 11,370 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 23% | 10,419 | | Weight per kWp | 51.2 | 53.2 | Typical | 4,641 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 19% of the 300-500 W band, against a median of 30 yrs. - **-0.350 %/°C temperature coefficient** - Bottom 23% of the 300-500 W band, against a median of -0.300. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.48 % - **Voltage at Pmax (Vmp):** 30.90 V - **Current at Pmax (Imp):** 12.95 A - **Open-circuit voltage (Voc):** 37.10 V - **Short-circuit current (Isc):** 13.70 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 20.5 kg - **Area:** 1.95 m2 - **Power density:** 204.8 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:** 328 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11468 of 14005 | | Power density | 11370 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 4641 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-Cut 108-Cell Architecture** - The 108 half-cut cell layout reduces resistive losses by up to 75% compared to full-cell modules and significantly improves shade tolerance. In practice, this delivers more stable energy output in residential prosumer installations where chimneys, antennas, or dormers partially shade the array. - **Up to 21.51% Efficiency — Top of Segment** - The highest-power variant reaches 21.51% module efficiency — equal to Solarspace SS8-54HSB (21.51%) and virtually level with GCL-M10/54H (21.50%). Phono Solar TWINPLUS tops out at 20.98%, placing this series among the most efficient compact 108-cell modules available in its class. - **Compact 108-Cell Form Factor** - Fewer cells (108 vs. 144–156 in full-size modules) result in ~1,724×1,134 mm dimensions and lower weight, simplifying installation on small residential rooftops without requiring rafter modifications or a redesigned racking system. - **25-Year Linear Power Warranty** - Hounen Solar guarantees at least 84.8% of rated power output after 25 years — consistent with the Tier-1 market standard (JA Solar, Trina Solar) — backed by a 12-year product warranty, providing full lifecycle protection for residential and commercial investors alike. ## Cons - **Discontinued Product Series** - The HNM7-SHDB 108 series is listed as discontinued: replacement modules may be unavailable, manufacturer technical support is limited, and expanding an existing installation with identical panels will be difficult. This presents meaningful operational risk for projects that may require individual panel replacement over a 10–15 year horizon. - **Not Listed on BNEF Tier 1** - Hounen Solar does not appear on the BNEF Tier 1 list (Q1 2026), which may restrict access to bank financing for projects exceeding 10 MW and reduce perceived bankability among institutional investors. Direct peer comparables GCL and Phono Solar both hold Tier-1 status. - **PERC Technology — Legacy Cell Generation** - As of 2025, N-type TOPCon accounts for approximately 75% of new Chinese PV manufacturing capacity, offering a lower degradation rate (~0.4%/yr vs. ~0.7%/yr for PERC) and better high-temperature performance. Newer 108-cell TOPCon modules already deliver 430–450 W at comparable dimensions, making PERC a technologically trailing standard in the current market. ## About this series The **Hounen Solar HNM7-SHDB 108** series is a compact photovoltaic panel based on the **PERC bifacial** technology, which stands out with its ability to absorb solar radiation from both the front and back sides - resulting in a significantly higher energy yield throughout the day. The use of **half-cut cells** in a 108-cell configuration effectively reduces resistive losses and significantly improves tolerance to partial shading - the panel does not experience a sudden drop in performance when part of its surface is obscured by trees or chimneys. Due to the smaller number of cells compared to 144- or 156-cell models, the 108-cell series offers **compact dimensions** ideal for smaller roof areas and residential prosumer installations. The PERC technology with an additional reflective layer on the back of the cell increases light absorption and stabilizes performance under high temperatures. The **bifacial design** is particularly well-suited for ground-mounted and roof-mounted installations with light-colored surfaces, where reflected light further powers the back surface of the panel. The manufacturer offers a 12-year product warranty and 25-year power warranty, making this series a reliable and long-term choice for both private and commercial investors. ## Notable figures - Efficiency of 20.5% is 1.3pp below the \*\*database\*\* median (21.8%) - Power density of 204.8 W/m² is 13.3 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - -0.35%/°C temperature coefficient - 0.05pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - At 20.5 kg, this panel is 6.0 kg lighter than \*\*database\*\* median (26.5 kg) - easier handling during installation - Ranked #11468 out of 14005 panels for efficiency in the database ## Questions ### What does the 108 half-cut cell layout in the Hounen Solar HNM7-SHDB 108 Series mean for performance? The HNM7-SHDB 108 uses 108 half-cut PERC cells — each cell is split in half compared to a standard cell. This reduces resistive losses and limits power drop caused by partial shading from chimneys or antennas. In practice, the panel maintains higher output throughout the day, especially on rooftops where obstructions regularly cast shadows on part of the array. ### Are Hounen Solar HNM7-SHDB 108 panels a good fit for a small pitched residential roof? Yes. The HNM7-SHDB 108 measures 1724×1134 mm and delivers up to 420 Wp, making it well-suited for smaller residential rooftops. The 108-cell format is more compact than 144- or 156-cell modules, which simplifies handling and installation on standard pitched roofs without requiring custom racking solutions. ### What warranties does Hounen Solar offer on the HNM7-SHDB 108 Series? Hounen Solar backs the HNM7-SHDB 108 with a 12-year product warranty covering material and manufacturing defects, plus a 25-year linear power warranty. After 25 years, the module is guaranteed to retain at least 84.8% of its rated output. Annual degradation after year one is capped at 0.55%, ensuring consistent energy production over the system's lifetime. ### How do HNM7-SHDB 108 panels perform during hot summer days? The HNM7-SHDB 108 has a temperature coefficient of -0.35%/°C, which is a relatively low power loss rate as cell temperature rises above the standard 25°C STC test condition. The PERC technology, which includes a rear-surface passivation layer, helps stabilize efficiency under high-temperature conditions typical of summer heat. ### Is the Hounen Solar HNM7-SHDB 108 a bifacial panel? No, the HNM7-SHDB 108 is a monofacial panel — it generates power only from the front surface. While other models in the HNM7 family are available as bifacial modules, this 108-cell variant is single-sided. Installation is straightforward and does not require a reflective ground surface or elevated racking to capture rear-side irradiance. ### What is the efficiency and available power range of the Hounen Solar HNM7-SHDB 108? The HNM7-SHDB 108 Series reaches up to 420 Wp with module efficiency between 20.2% and 21.5%. The compact 1724×1134 mm footprint makes efficient use of available roof space. Multiple power variants are available within the series starting at approximately 395 Wp, allowing system designers to match capacity to roof area and household energy demand. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767944243386646-a0fe9ab0cdf5.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | Cooler, +2.6 pp, +5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +2.6 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.6 pp | | [Hounen Solar HNM7-SHDB108-395/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-395-m) | 395 W | -0.2 pp | | [Hounen Solar HNM7-SHDB108-405/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-405-m) | 405 W | +0.3 pp | | [Hounen Solar HNM7-SHDB108-410/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-410-m) | 410 W | +10 W, +0.5 pp | | [Hounen Solar HNM7-SHDB108-415/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb108-415-m) | 415 W | +15 W, +0.8 pp | | [Hounen Solar HNM7-UHLDD108-420/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-420-m) | 420 W | Cooler, +1.0 pp, +5 yr warranty | | [Hounen Solar HNM7-UHLDD108-425/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-425-m) | 425 W | Cooler, +1.3 pp, +5 yr warranty | | [Hounen Solar HNM7-UHLDD108-430/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-430-m) | 430 W | Cooler, +1.5 pp, +5 yr warranty | | [Hounen Solar HNM7-UHLDD108-435/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd108-435-m) | 435 W | Cooler, +1.8 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +110 W, cooler, +4.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +95 W, cooler, +4.3 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm7-shdb108-400-m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.