--- title: "Hounen Solar HNM8-GPLDD132-725/N 725W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM8-GPLDD132-725/N 725W solar panel. Specs: 23.34% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-725-n" updated: 2026-09-11 --- # Hounen Solar HNM8-GPLDD132-725/N Efficiency leader, weak in heat 90 panels in the segment N-type 700-750 W ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM8-GPLDD132-725/N - **Series:** HNM8-GPLDD132 - **Rated power:** 725 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 700-750 W (90 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 725 W | 710 W | Strong - top 11% | | | Module efficiency | 23.34% | 22.88% | Strong - top 8% | 943 | | Power density | 233.4 | 228.6 | Strong - top 11% | 936 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 16% | 6,093 | | Weight (kg) | 38.5 kg | 38.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.34% | 22.88% | Strong - top 8% | 943 | | Power density | 233.4 | 228.6 | Strong - top 11% | 936 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 16% | 6,093 | | Weight per kWp | 53.1 | 53.5 | Typical | 6,879 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.34% module efficiency** - Top 8% of the N-type 700-750 W segment, against a median of 22.88%. Ranked 943rd in the whole database. - **233.4 watts per square metre** - Top 11% of the N-type 700-750 W segment, against a median of 228.6. ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 16% of the N-type 700-750 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):** 725 W - **Efficiency:** 23.34 % - **Voltage at Pmax (Vmp):** 41.50 V - **Current at Pmax (Imp):** 17.47 A - **Open-circuit voltage (Voc):** 49.30 V - **Short-circuit current (Isc):** 18.47 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:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 38.5 kg - **Area:** 3.11 m2 - **Power density:** 233.4 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:** 634 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 943 of 14005 | | Power density | 936 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 6879 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Peak efficiency 23.34% — peer group leader** - The module's maximum efficiency of 23.34% marginally outperforms direct competitors in the same power class: TCL Zhonghuan G12-66P, Tongwei TWMNF N-type, and Trina Solar Vertex N i-TOPCon — all rated at 23.3% at 725 Wp. Even a fraction of a percentage point in efficiency translates into measurably higher annual energy yield per unit roof or ground area. - **N-type cells with 18BB multi-busbar** - N-type cells exhibit lower light-induced degradation (LID) and better temperature performance than legacy P-type PERC. The 18BB (multi-busbar) configuration shortens the current path between fingers and busbars, reducing resistive losses and microcrack risk compared to mainstream 9–12BB designs — a documented contributor to higher lifetime energy generation. - **80±10% bifaciality with glass-glass construction** - A bifaciality factor of 80±10% enables up to 25% additional rear-side power gain in high-albedo installations (white TPO membranes, gravel, sand, snow). The glass-glass encapsulation outperforms standard backsheet laminates in resistance to moisture ingress, ammonia, salt mist, and UV radiation — a key advantage for industrial rooftops and large-scale ground-mount PV farms. - **30-year linear power warranty** - The 30-year linear power output warranty differentiates the HNM8-GPLDD132 series from the segment: direct peer Trina Solar Vertex N i-TOPCon ships with a standard 25-year power warranty, giving Hounen Solar a 5-year edge in guaranteed degradation coverage. IEC 61730 and UL 61730 certifications confirm compliance with international safety standards. - **6 power variants across 700–725 Wp** - Six available power variants spanning 700–725 Wp allow precise string-level MPPT matching without nominal power compromises — critical when engineering large-scale PV farms where voltage-to-power alignment directly reduces mismatch losses and improves inverter loading efficiency. ## Cons - **Not on BNEF Tier-1 list** - Hounen Solar does not appear on BloombergNEF's Tier-1 solar module manufacturer lists for Q3/Q4 2025 or Q1 2026. All three direct peer comparables — TCL Zhonghuan, Tongwei, and Trina Solar — hold Tier-1 BNEF status, which is the standard bankability requirement for project finance on utility-scale PV assets above 10 MW. Absence from the Tier-1 list can effectively disqualify the series from bank-financed projects or require additional credit enhancements. - **Limited brand track record in the EU market** - Hounen Solar has a limited European reference portfolio compared to Trina Solar (operating since 1997), Tongwei, and TCL Zhonghuan — all with thousands of documented installations across Poland and the EU. Lower brand recognition can complicate asset insurance, project refinancing, or secondary-market sales where manufacturer history is a standard due-diligence factor. ## About this series The HNM8-GPLDD132 series are N-TYPE photovoltaic modules with half-cut cell technology and double-sided glass, combining high efficiency with exceptional durability. The use of **18BB (multi-busbar) technology** shortens the distance between the busbars and the finger grid, directly resulting in higher energy generation and reduced resistive losses. **Bifaciality of 80±10%** allows capturing up to 25% additional power from the back side of the module - particularly valuable in installations with reflective surfaces or on roofs covered with light-colored membranes. Thanks to **enhanced low-light performance**, the panels operate efficiently on cloudy days, in fog, or at dawn - significantly improving annual energy yields in the Polish climate. **PID resistance**, ensured during cell production and material selection, guarantees stable operation throughout the entire lifespan. The modules withstand harsh weather conditions - salt, ammonia, sand, high temperatures, and humidity - making them ideal for industrial and large-scale photovoltaic installations. **30-year linear warranty** on output power, along with a 12-year product warranty, certified by IEC61730 and UL61730, makes this series a reliable choice for demanding investors. ## Notable figures - At 23.3% efficiency, this panel is on par with typical \*\*N-type 700-750W\*\* modules - Power density of 233.4 W/m² packs 4.8 W/m² more into the same footprint vs \*\*N-type 700-750W\*\* median (228.6 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*N-type 700-750W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - In the top 7% for efficiency among all N-type panels ## Questions ### What warranty does the Hounen Solar HNM8-GPLDD132 series come with? The HNM8-GPLDD132 series includes a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. A linear warranty means a consistent, gradual degradation rate throughout the module's lifetime with no sudden efficiency drops. The modules are certified to IEC61730 and UL61730 standards, providing independent confirmation of their durability and safety. ### How much extra energy does the bifacial design of the HNM8-GPLDD132 actually produce? The HNM8-GPLDD132 has a bifaciality factor of 80±10%, meaning the rear side can contribute up to 25% additional power compared to a monofacial module. This gain is most significant in ground-mounted systems with light-colored ground cover, flat roofs with white TPO or PVC membranes, or utility-scale farms with sufficient module clearance above the surface. On dark-colored pitched roofs, the bifacial gain is negligible. ### Do the Hounen Solar HNM8-GPLDD132 panels perform well on cloudy days and in Northern European climates? Yes. The N-type cells used in the HNM8-GPLDD132 series have an enhanced spectral response under diffuse light compared to PERC technology. The modules generate power more efficiently on overcast days, during early morning fog, and at dawn. This translates directly into higher annual energy yields in climates like Poland or Germany, where cloud cover is frequent for a significant part of the year. ### What does 18BB multi-busbar technology mean in the HNM8-GPLDD132, and why does it matter? 18BB stands for 18 busbars running across each cell. More busbars shorten the path current travels through the finger grid, reducing resistive losses. In practice this increases module efficiency and improves resilience to microcracks, because current can reroute around damaged spots through multiple alternative paths. This is one reason the HNM8-GPLDD132 achieves a peak power output of 725 Wp. ### Is the HNM8-GPLDD132 series suitable for large commercial and utility-scale solar farms? Yes, the HNM8-GPLDD132 series is designed for commercial and utility-scale applications. The modules are tested for resistance to salt mist, ammonia, sand abrasion, high temperature, and humidity, making them suitable for demanding industrial environments. The high unit power of up to 725 Wp reduces the number of modules needed for a given system capacity, lowering BoS costs and installation labor on large projects. ### How do the HNM8-GPLDD132 N-type modules compare to Hounen Solar's PERC panels of the same form factor? The HNM8-GPLDD132 uses N-type cells instead of the P-type PERC technology found in the HNM8-TPLDD132 series. N-type cells offer lower initial degradation (no LID effect), better temperature coefficient performance, and improved low-light response. Hounen's PERC variant of the same 132-cell format tops out at 650-670 Wp, while the N-type version reaches 700-725 Wp, delivering measurably higher energy yield from the same roof or ground area. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767944178432630-6c5a17eb1d0e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -45 W, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -50 W, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +1.6 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | Cooler, lighter, +1.4 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | -40 W, lighter, +1.2 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +35 W, cooler, +1.2 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | -45 W, cooler, +1.0 pp | | [Hounen Solar HNM8-TPLDD132-650/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-650-m) | 650 W | -75 W, hotter, -2.4 pp | | [Hounen Solar HNM8-TPLDD132-655/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-655-m) | 655 W | -70 W, hotter, -2.2 pp | | [Hounen Solar HNM8-TPLDD132-660/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-660-m) | 660 W | -65 W, hotter, -2.1 pp | | [Hounen Solar HNM8-TPLDD132-665/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-665-m) | 665 W | -60 W, hotter, -1.9 pp | | [Hounen Solar HNM8-TPLDD132-670/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-670-m) | 670 W | -55 W, hotter, -1.8 pp | | [Hounen Solar HNM8-GPLDD132-700/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-700-n) | 700 W | -25 W, -0.8 pp | | [Hounen Solar HNM8-GPLDD132-705/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-705-n) | 705 W | -20 W, -0.6 pp | | [Hounen Solar HNM8-GPLDD132-710/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-710-n) | 710 W | -15 W, -0.5 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +80 W, cooler, +1.8 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-725-n 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.