--- title: "PolyCrown Solar Tech NS-660MH-120 660W Solar Panel - Specs & Review | ComparePV" description: "PolyCrown Solar Tech NS-660MH-120 660W solar panel. Specs: 23.32% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/polycrown-solar-tech-ns-660mh-120" updated: 2026-09-11 --- # PolyCrown Solar Tech NS-660MH-120 Light for its output, short guarantee 109 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** PolyCrown Solar Tech - **Model:** NS-660MH-120 - **Series:** Monocrystalline120 - **Rated power:** 660 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 650-700 W (109 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 660 W | Typical | | | Module efficiency | 23.32% | 23.30% | Typical | 973 | | Power density | 233.2 | 233.2 | Typical | 1,089 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 31.0 kg | 33.5 kg | Strong - top 10% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.32% | 23.30% | Typical | 973 | | Power density | 233.2 | 233.2 | Typical | 1,089 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 47.0 | 50.9 | Strong - top 10% | 1,440 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Strengths - **47.0 kg per kWp** - Top 10% of the N-type 650-700 W segment, against a median of 50.9. ### Watch out for - **25 year performance warranty** - Bottom 7% of the N-type 650-700 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 23.32 % - **Voltage at Pmax (Vmp):** 38.26 V - **Current at Pmax (Imp):** 17.26 A - **Open-circuit voltage (Voc):** 45.51 V - **Short-circuit current (Isc):** 18.13 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 120 ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 30 mm - **Weight:** 31.0 kg - **Area:** 2.83 m2 - **Power density:** 233.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 89.0 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.42 % - **Output after 30 years:** 574 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 973 of 14005 | | Power density | 1089 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 1440 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **N-type half-cut cell technology** - The use of N-type half-cut cells in a 120-cell format reduces resistive losses and improves partial-shading performance compared to older P-type/PERC designs, translating into higher annual energy yield under uneven roof irradiance. - **Multi-busbar technology for durability** - The multi-busbar metallization grid (aligned with the 9BB approach used across this product line) lowers the risk of microcracks and improves current flow, supporting the stated 25-year linear power warranty. - **Wide power range of 450-660 Wp** - The 660 Wp upper limit puts the series on par with leading large-format competitors such as AE Solar AURORA ME-132 and Talesun BIPRO TM7G78M (both also up to 660 Wp), enabling maximum power density design on limited roof space. - **Standard 15/25-year warranty package** - The 15-year product warranty and 25-year linear power warranty match current market standards for N-type modules, giving investors a predictable power degradation profile over time. ## Cons - **Production discontinued - limited servicing** - The Monocrystalline120 series has been discontinued (series\_info.discontinued = true), meaning limited availability of spare parts, service support, and reduced enforceability of the long-term warranty going forward. - **Efficiency below segment leaders in N-type** - Peak efficiency of 23.32% trails direct N-type/TOPCon competitors in the same power class - HY Solar (23.8%) and Talesun BIPRO TM7G78M (23.7%) - meaning slightly lower energy yield for the same roof area. - **Manufacturer without confirmed Tier-1 status** - PolyCrown Solar Tech (China, founded 2014) does not appear on publicly available BNEF Tier 1 reports, unlike more established brands in the peer comparable set, raising bankability concerns and long-term warranty reliability, particularly combined with the series' discontinuation. ## About this series The PolyCrown Solar Tech Monocrystalline 120 series panels introduce a new quality to rooftop installations through the use of advanced **half-cut cell** technology. This specific 120-cell format allows for a significant reduction in energy losses resulting from internal resistance and shading effects. Unlike standard modules, this series performs excellently in challenging lighting conditions, which directly translates into higher annual yields. The use of **multi-busbar technology** minimizes the risk of micro-cracks and improves current flow, making the panels exceptionally resistant to aging processes. They solve the problem of limited installation space by offering **maximum power density** from every square meter of roof surface. It is an optimal solution for homeowners and businesses seeking a balance between aesthetics and high operating efficiency. What sets them apart from the competition is their exceptional **thermal stability**, which allows the modules to maintain high efficiency even during intense summer heat. The use of pure monocrystalline silicon guarantees investment security, effectively eliminating concerns about rapid power degradation over time. This is a solid choice for investors who prioritize **durability and a quick return** from a modern photovoltaic system. ## Notable figures - Efficiency of 23.3% matches the \*\*N-type 650-700W\*\* median - At 233.2 W/m² power density, roof space requirements are typical for \*\*N-type 650-700W\*\* panels - At -0.29%/°C, hot weather performance is typical for \*\*N-type 650-700W\*\* panels - Weight of 31.0 kg (2.5 kg below \*\*N-type 650-700W\*\* median of 33.5 kg) allows easier transport and roof mounting - In the top 7% for efficiency among all N-type panels ## Questions ### Is the PolyCrown Solar Tech Monocrystalline120 series still available for purchase? The Monocrystalline120 series by PolyCrown Solar Tech has been discontinued and is no longer offered through regular sales channels. Limited stock may still be available at select distributors — verify availability directly before committing to a purchase. For new installations, we recommend considering current series from the same manufacturer to ensure full warranty coverage and ongoing after-sales support. ### What warranties does the manufacturer provide for the PolyCrown Solar Tech Monocrystalline120 panels? The manufacturer offers a 15-year product warranty covering material and workmanship defects, along with a separate 25-year power output warranty guaranteeing the module retains a specified percentage of its rated capacity over that period. Because this series is discontinued, warranty claim fulfillment should be confirmed in writing by your local distributor or importer prior to finalizing any purchase agreement. ### What are N-type cells and why does the Monocrystalline120 series use them? N-type silicon cells exhibit lower light-induced degradation (LID) and higher initial efficiency compared to standard P-type and PERC cells. In the Monocrystalline120 series, this results in more stable power output throughout the 25-year operational lifetime and better performance under elevated temperatures. Choosing N-type technology reduces the risk of accelerated power degradation — a critical factor when calculating the expected return on investment. ### How do half-cut cells and multi-busbar technology affect the Monocrystalline120's output under partial shading? The 120-cell half-cut format splits the module into two independent half-panels, limiting energy losses when part of the panel is shaded — for example by a chimney, antenna, or dormer window. The multi-busbar design shortens current paths and reduces the risk of microcracks developing in the cells. Both technologies work synergistically, delivering higher annual energy yields on rooftops with less-than-ideal solar exposure. ### What is the maximum power output of the Monocrystalline120 panels and what system sizes are they suited for? The Monocrystalline120 series reaches a maximum power of 660 Wp, positioning it as a high power density module suited for both residential prosumer systems and smaller commercial rooftop installations with limited available roof space. The high per-panel wattage means fewer modules are required to reach a given system capacity, which can reduce overall mounting structure and labor costs. ### Do the PolyCrown Solar Tech Monocrystalline120 panels maintain high efficiency during hot summer days? Yes, the Monocrystalline120 series is noted for its above-average thermal stability, a direct benefit of N-type cell technology. On hot summer days, conventional P-type PERC modules typically lose a significant share of their output due to rising cell temperatures, while the low temperature coefficient of power in this series limits those losses. In practice, this translates to higher energy yields compared to similarly rated P-type modules under peak heat conditions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ns-620-660mh-120-2172-1303-30-a9c2bc268fed.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Lighter, +1.9 pp, +5 yr warranty | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, +1.9 pp, +5 yr warranty | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, +1.7 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Lighter, +1.7 pp, +5 yr warranty | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, +1.7 pp, +5 yr warranty | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +35 W, +1.6 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, +1.5 pp, +5 yr warranty | | [PolyCrown Solar Tech NS-620MH-120](https://comparepv.com/panel/polycrown-solar-tech-ns-620mh-120) | 620 W | -40 W, -1.4 pp | | [PolyCrown Solar Tech NS-630MH-120](https://comparepv.com/panel/polycrown-solar-tech-ns-630mh-120) | 630 W | -30 W, -1.1 pp | | [PolyCrown Solar Tech NS-640MH-120](https://comparepv.com/panel/polycrown-solar-tech-ns-640mh-120) | 640 W | -20 W, -0.7 pp | | [PolyCrown Solar Tech NS-650MH-120](https://comparepv.com/panel/polycrown-solar-tech-ns-650mh-120) | 650 W | -10 W, -0.4 pp | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, +0.7 pp, +5 yr warranty | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | Hotter, lighter, +5 yr warranty | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | Cooler, heavier, +5 yr warranty | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | Hotter, lighter, +5 yr warranty | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | Cooler, heavier, +5 yr warranty | --- Source: https://comparepv.com/panel/polycrown-solar-tech-ns-660mh-120 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.