--- title: "Hounen Solar HNM7-UHLDD144-585/M 585W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM7-UHLDD144-585/M 585W solar panel. Specs: 22.65% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-585-m" updated: 2026-09-11 --- # Hounen Solar HNM7-UHLDD144-585/M Middle of its segment, weak in heat 259 panels in the segment N-type 550-600 W ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM7-UHLDD144-585/M - **Series:** HNM7-UHLDD144 Series - **Rated power:** 585 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 550-600 W (259 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 585 W | 580 W | Typical | | | Module efficiency | 22.65% | 22.45% | Typical | 3,522 | | Power density | 226.5 | 224.5 | Typical | 3,500 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 17% | 6,093 | | Weight (kg) | 31.5 kg | 29.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.65% | 22.45% | Typical | 3,522 | | Power density | 226.5 | 224.5 | Typical | 3,500 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 17% | 6,093 | | Weight per kWp | 53.8 | 52.3 | Typical | 7,897 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 17% of the N-type 550-600 W segment, against a median of -0.290. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 585 W - **Efficiency:** 22.65 % - **Voltage at Pmax (Vmp):** 43.00 V - **Current at Pmax (Imp):** 13.61 A - **Open-circuit voltage (Voc):** 51.70 V - **Short-circuit current (Isc):** 14.41 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:** 144 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 31.5 kg - **Area:** 2.58 m2 - **Power density:** 226.5 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:** 511 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3522 of 14005 | | Power density | 3500 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 7897 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-Type TOPCon cells with 16 busbars** - N-Type TOPCon technology combined with half-cut cells and a 16-busbar layout reduces resistive losses and LID degradation, delivering higher efficiency (up to 22.65%) and more stable output under partial shading than legacy P-Type PERC modules. - **Efficiency matches segment leaders** - Peak efficiency of 22.65% matches the best comparable N-Type series on the market (Hanersun Hitouch 5N - 22.65%, Q-SUN Qrystal N8 - 22.65%) and exceeds Risen RSM144-9 (22.6%), placing the HNM7-UHLDD144 at the top of its 565-585 Wp power class. - **Bifacial dual-glass construction** - Dual-glass bifacial laminate captures light reflected off the ground, boosting energy yield without increasing installation footprint, while also improving mechanical resistance to hail and snow loads. - **30-year linear power warranty** - The 30-year power warranty aligns with the current premium standard for bifacial N-Type TOPCon modules and matches offerings from leading manufacturers, supporting predictable long-term investment returns. - **Established manufacturer with global scale** - Hounen Solar has operated since 2010 and, per manufacturer data, has shipped over 320 GW of modules globally, with US-based assembly expanding since 2022 to improve service support and logistics for large commercial projects. ## Cons - **12-year product warranty below premium segment** - The product warranty is limited to 12 years, shorter than the 15-25 years now offered by many N-Type TOPCon manufacturers in this power class as of 2025-2026, which may reduce competitiveness on total cost of ownership for large-scale projects. - **No confirmed BNEF Tier 1 status** - Publicly available BloombergNEF Tier 1 listings (Q1 2026) do not clearly confirm Hounen Solar's inclusion, unlike competitor Hanersun, which officially communicates Tier 1 status for its 600W+ technology - a potentially significant factor for investors requiring bankable financing. ## About this series The HNM7-UHLDD144 series comprises advanced solar modules built on **N-Type TOPCon cells**, engineered for commercial and utility-scale installations where every percentage point of energy yield matters. The applied **half-cell technology** with a 16-busbar layout reduces resistive losses and improves current collection, resulting in more stable panel performance even under partial shading. The double-glass, **bifacial construction** captures light reflected from the ground, boosting total energy production without requiring additional installation area - a solution particularly valuable for industrial rooftops and utility-scale solar farms. Thanks to its N-Type architecture, the modules feature a **lower long-term degradation rate** compared to traditional P-Type panels, translating into longer service life and a more predictable return on investment. The dual glass layer further enhances mechanical resistance and structural durability under demanding weather conditions. The HNM7-UHLDD144 series meets the needs of investors and system integrators seeking proven technology that meaningfully lowers LCOE and minimizes operating costs over the entire lifetime of an installation. ## Notable figures - Efficiency of 22.6% matches the \*\*N-type 550-600W\*\* median - Power density of 226.5 W/m² matches the \*\*N-type 550-600W\*\* median - At -0.30%/°C, hot weather performance is typical for \*\*N-type 550-600W\*\* panels - At 31.5 kg (2.0 kg above \*\*N-type 550-600W\*\* median of 29.5 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### How much power does one HNM7-UHLDD144 series panel generate? HNM7-UHLDD144 series modules reach up to 585 Wp maximum power. That's a high output for a panel aimed at commercial and utility-scale installations, thanks to N-type TOPCon cells and half-cell technology with 16 busbars, which reduce resistive losses and improve module efficiency. ### What's the difference between N-type TOPCon technology and standard P-type panels? N-type TOPCon cells have a lower degradation rate over time and higher initial efficiency than traditional P-type cells. In practice, this means HNM7-UHLDD144 panels lose less power over the years of operation, resulting in higher lifetime energy yield and a better return on investment. ### Are HNM7-UHLDD144 panels bifacial, and is it worth it? Yes, the series uses a dual-glass bifacial design that generates additional energy from the rear side of the module using light reflected off the ground. This is especially valuable on industrial roofs with light-colored coverings and in ground-mounted PV farms, where output can increase without expanding the installation footprint. ### What warranty comes with HNM7-UHLDD144 panels? Manufacturer Hounen Solar provides a 12-year product warranty and a 30-year power output warranty. This warranty length is typical for high-end N-type modules and reflects the manufacturer's confidence in the durability of TOPCon technology and the dual-glass construction. ### Are HNM7-UHLDD144 panels suitable for industrial roofs and utility-scale PV farms? Yes, the series is designed for commercial and utility-scale installations. High unit power up to 585 Wp, half-cell technology that limits losses from partial shading, and bifacial design make these modules well-suited for both large flat roofs and ground-mounted solar farms. ### Who manufactures HNM7-UHLDD144 panels and where is the manufacturer based? The HNM7-UHLDD144 series is manufactured by Hounen Solar, a company based in China. The manufacturer specializes in PV modules using advanced N-type TOPCon technology and bifacial designs, primarily targeting the commercial and industrial segment. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767944457545357-26443736160f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +2.2 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +2.0 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +50 W, lighter, +2.0 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +45 W, cooler, +1.8 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, 15 kg lighter, +1.8 pp | | [Hounen Solar HNM7-SHDB144-535/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-535-m) | 535 W | -50 W, -1.9 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB144-540/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-540-m) | 540 W | Hotter, -1.8 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB144-545/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-545-m) | 545 W | Hotter, -1.5 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB144-550/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-550-m) | 550 W | Hotter, -1.4 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB144-555/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-555-m) | 555 W | Hotter, -1.2 pp, -5 yr warranty | | [Hounen Solar HNM7-SHDB144-560/M](https://comparepv.com/panel/hounen-solar-hnm7-shdb144-560-m) | 560 W | Hotter, -1.0 pp, -5 yr warranty | | [Hounen Solar HNM7-UHLDD144-565/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-565-m) | 565 W | -20 W, -0.8 pp | | [Hounen Solar HNM7-UHLDD144-570/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-570-m) | 570 W | -15 W, -0.6 pp | | [Hounen Solar HNM7-UHLDD144-575/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-575-m) | 575 W | -10 W, -0.4 pp | | [Hounen Solar HNM7-UHLDD144-580/M](https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-580-m) | 580 W | Very close match | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +65 W, lighter, +2.6 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm7-uhldd144-585-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.