--- title: "Hounen Solar HNM8-TPLDD132-660/M 660W Solar Panel - Specs & Review | ComparePV" description: "Hounen Solar HNM8-TPLDD132-660/M 660W solar panel. Specs: 21.25% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-660-m" updated: 2026-09-11 --- # Hounen Solar HNM8-TPLDD132-660/M Middle of its segment, heavy for its output 5,083 panels in the 560-760 W band, all technologies ## Identity - **Manufacturer:** Hounen Solar - **Model:** HNM8-TPLDD132-660/M - **Series:** HNM8-TPLDD132 - **Rated power:** 660 W - **Cell technology:** Monocrystalline - **Bifacial:** yes ## How it compares Compared against 560-760 W band, all technologies (5083 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 620 W | Strong - top 25% | | | Module efficiency | 21.25% | 22.54% | Weak - bottom 11% | 8,904 | | Power density | 212.5 | 225.4 | Weak - bottom 11% | 8,959 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 14% | 8,778 | | Weight (kg) | 38.5 kg | 32.7 kg | Weak - bottom 7% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.25% | 22.54% | Weak - bottom 11% | 8,904 | | Power density | 212.5 | 225.4 | Weak - bottom 11% | 8,959 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 14% | 8,778 | | Weight per kWp | 58.3 | 53.1 | Weak - bottom 7% | 11,655 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **58.3 kg per kWp** - Bottom 7% of the 560-760 W band, against a median of 53.1. Ranked 11,655th in the whole database. - **212.5 watts per square metre** - Bottom 11% of the 560-760 W band, against a median of 225.4. - **21.25% module efficiency** - Bottom 11% of the 560-760 W band, against a median of 22.54%. - **Best for:** Utility-scale, commercial and agrivoltaic. - **Not ideal for:** Weight-limited structures, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 21.25 % - **Voltage at Pmax (Vmp):** 38.10 V - **Current at Pmax (Imp):** 17.33 A - **Open-circuit voltage (Voc):** 45.60 V - **Short-circuit current (Isc):** 18.37 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/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:** 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:** 212.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.48 % - **Output after 30 years:** 562 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8904 of 14005 | | Power density | 8959 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 11655 of 14005 | | Warranty | 21 of 14005 | ## Pros - **30-year linear power warranty** - The manufacturer offers a 30-year linear power warranty — 5 years longer than the 25-year industry standard applied by high-volume Tier-1 manufacturers such as Jinko Solar, JA Solar, and Trina Solar. For commercial and utility-scale LCOE calculations, the extended guarantee provides a more favorable long-term risk profile and higher residual asset value. - **Bifacial peak power up to +25% from rear side** - The bifacial design enables the rear surface to contribute up to 25% additional power from ground-reflected irradiance (albedo). Installations on white TPO/PVC membranes (albedo ~50–60%) or gravel substrates typically achieve 10–20% real rear-side gains, directly reducing LCOE without additional BoS costs. - **12BB Multi Busbar — reduced series resistance** - The 12-busbar configuration (vs. 9BB in legacy P-type PERC generations) shortens current paths through the finger grid, lowering series resistance at the cell level. The direct result is a higher fill factor (FF) on the I-V curve and improved energy yield, especially under partial shading conditions where module-level MPPT optimizers can fully exploit this characteristic. - **Efficiency competitive with peer comparables** - The efficiency range of 20.92–21.57% places the HNM8-TPLDD132 series on par with its direct peer comparables: Hiwatt Solar HW-M12/132H (21.6%), Techwise Solar Summit Series (21.57%), and ZNShine ZXM8-TP132 (21.57%). The 21.57% upper bound confirms the series is technologically on-trend for its price segment. - **Dual IEC61730 + UL61730 certification and environmental resilience** - Dual certification (IEC61730 for the European market, UL61730 for the US market) eliminates the need for re-qualification on cross-market or export projects. Confirmed resistance to salt mist, ammonia, sand, and extreme humidity makes the series suitable for agri-PV, port-adjacent, and industrial installations in harsh climatic conditions. ## Cons - **P-type PERC, not N-type TOPCon** - The series is built on older P-type PERC architecture, which delivers a bifacial factor of approximately 70% vs. ~85% for modern N-type TOPCon modules (e.g., Jinko Tiger Neo, LONGi Hi-MO 9). Annual degradation for P-type PERC runs at 0.6–0.8% vs. 0.4–0.5% for TOPCon, and bifacial TOPCon modules produce a real 3–5% more energy annually than bifacial PERC — a difference that compounds meaningfully in 30-year LCOE models. - **Not on BNEF Tier 1 list** - Hounen Solar does not appear on the BNEF Tier 1 module manufacturer lists for Q1–Q4 2025 or Q1 2026, meaning the manufacturer has not met BNEF bankability criteria (at least 6 projects ≥10 MW financed by independent commercial banks in the past 2 years). For utility-scale projects requiring project finance from institutional lenders, this may represent a formal barrier or require additional credit enhancements. ## About this series The HNM8-TPLDD132 series comprises advanced bifacial P-type monocrystalline modules featuring **12BB (Multi Busbar)** technology, which shortens the distance between the busbars and the finger grid, directly translating into higher energy yield from each cell. The series' greatest differentiator is its **bifacial technology** - the rear surface of the panel can generate up to 25% additional power depending on the ground albedo, making it an excellent choice for installations on bright roofs with white membranes, gravel surfaces, and ground-mounted systems. **Resistance to the PID effect**, ensured by rigorous quality control of cells and raw materials, guarantees long-term stability of energy production - without the degradation typical of cheaper modules. The series performs excellently in demanding environmental conditions: it is resistant to sea salt, ammonia, sand, and extreme humidity, making it predestined for agrivoltaic farms and industrial installations. **Improved response to low irradiance** - during cloud cover, fog, or at dawn - allows for maximizing daily energy yield throughout the year. The series' reliability is confirmed by a **30-year linear power warranty** and IEC61730 and UL61730 certifications, ensuring compliance with the requirements of the European and American markets. ## Notable figures - Module efficiency of 21.2% is 0.6pp below average for \*\*database\*\* panels (median: 21.8%) - Power density of 212.5 W/m² is 5.6 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - At -0.34%/°C, loses 0.04pp more power per degree than \*\*database\*\* median (-0.30%/°C) - At 38.5 kg (12.0 kg above \*\*database\*\* median of 26.5 kg), requires checking roof load capacity - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### What warranty does the Hounen Solar HNM8-TPLDD132 series come with? Hounen Solar backs the HNM8-TPLDD132 series with a 12-year product warranty covering material and manufacturing defects. In addition, a 30-year linear power warranty guarantees the modules will produce energy in line with the declared degradation curve throughout that period. This is among the longer warranty standards for P-type PERC modules and reflects the cell quality control and raw-material screening applied during production. ### What does bifacial technology do in the HNM8-TPLDD132 series and when does it actually pay off? Bifacial technology means the rear glass of the HNM8-TPLDD132 captures light reflected from the surface beneath, generating up to 25% additional power compared to a standard monofacial module. The gain is highest on high-albedo surfaces such as white TPO or PVC roofing membranes, light gravel, or concrete. For ground-mount and agrivoltaic systems with adequate row spacing, bifacial adds measurable energy yield that single-sided modules simply cannot match. ### Are the HNM8-TPLDD132 670 W panels suitable for agrivoltaic and industrial installations? Yes, the HNM8-TPLDD132 series is rated for resistance to salt mist, ammonia, sand, and extreme humidity. Ammonia resistance is especially critical for agrivoltaic installations near livestock facilities or fertilized crop fields. The bifacial design captures additional light reflected off open ground between rows, boosting yield in wide-pitch ground-mount layouts. IEC61730 and UL61730 certifications confirm compliance with both European and US market requirements. ### How large and heavy are the HNM8-TPLDD132 modules, and can one installer handle them? HNM8-TPLDD132 modules measure approximately 2384 × 1303 × 35 mm and weigh around 38.5 kg. These are typical large-format dimensions for the 132-cell G12 format, and safe handling on a rooftop or ground-mount racking system requires at least two installers. Before ordering, verify the load rating of your mounting structure, as the combined weight of multiple modules adds up quickly. ### Does the HNM8-TPLDD132 series perform well in overcast conditions and during short winter days? The HNM8-TPLDD132 features improved low-light response, delivering higher output at dawn, dusk, in fog, and on overcast days typical of Central European winters. The 12BB design shortens the electron path within each cell, reducing resistive losses even at low irradiance levels. In practice, the module starts generating meaningful power earlier in the morning and continues longer into the evening, resulting in a noticeably higher annual energy yield. ### What is 12BB technology in the HNM8-TPLDD132 and why does it matter? 12BB (Multi Busbar) technology replaces conventional 5 or 6 busbars with 12 thinner collection ribbons. The shorter distance between busbars and the finger grid lowers resistive losses and improves charge collection across the entire cell surface. The result is higher cell efficiency, slower degradation at interconnections, and better resistance to micro-cracks. In the HNM8-TPLDD132, 12BB works in synergy with PERC cell architecture and the bifacial rear glass, amplifying the benefits of each technology. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1767944145453806-ca8ce5da98cb.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, cooler, +3.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.6 pp | | [Hounen Solar HNM8-TPLDD132-650/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-650-m) | 650 W | -10 W, -0.3 pp | | [Hounen Solar HNM8-TPLDD132-655/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-655-m) | 655 W | Very close match | | [Hounen Solar HNM8-TPLDD132-665/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-665-m) | 665 W | Very close match | | [Hounen Solar HNM8-TPLDD132-670/M](https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-670-m) | 670 W | +10 W, +0.3 pp | | [Hounen Solar HNM8-GPLDD132-700/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-700-n) | 700 W | +40 W, cooler, +1.3 pp | | [Hounen Solar HNM8-GPLDD132-705/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-705-n) | 705 W | +45 W, cooler, +1.4 pp | | [Hounen Solar HNM8-GPLDD132-710/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-710-n) | 710 W | +50 W, cooler, +1.6 pp | | [Hounen Solar HNM8-GPLDD132-715/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-715-n) | 715 W | +55 W, cooler, +1.8 pp | | [Hounen Solar HNM8-GPLDD132-720/N](https://comparepv.com/panel/hounen-solar-hnm8-gpldd132-720-n) | 720 W | +60 W, cooler, +1.9 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +145 W, cooler, +3.9 pp | --- Source: https://comparepv.com/panel/hounen-solar-hnm8-tpldd132-660-m Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.