--- title: "JA Solar NS-420MH-80 420W Solar Panel - Specs & Review | ComparePV" description: "JA Solar NS-420MH-80 420W solar panel. Specs: 22.28% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-ns-420mh-80" updated: 2026-09-11 --- # JA Solar NS-420MH-80 Space saver, short guarantee 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** NS-420MH-80 - **Series:** Monocrystalline60 - **Rated power:** 420 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 435 W | Weak - bottom 16% | | | Module efficiency | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 13% | 5,137 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 20.0 kg | 22.0 kg | Strong - top 15% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 13% | 5,137 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 47.6 | 51.4 | Strong - top 15% | 1,771 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Strengths - **222.8 watts per square metre** - Top 13% of the TOPCon 400-450 W segment, against a median of 220.2. - **47.6 kg per kWp** - Top 15% of the TOPCon 400-450 W segment, against a median of 51.4. - **22.28% module efficiency** - Top 24% of the TOPCon 400-450 W segment, against a median of 22.00%. ### Watch out for - **25 year performance warranty** - Bottom 7% of the TOPCon 400-450 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 22.28 % - **Voltage at Pmax (Vmp):** 39.34 V - **Current at Pmax (Imp):** 10.68 A - **Open-circuit voltage (Voc):** 45.78 V - **Short-circuit current (Isc):** 11.46 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:** TOPCon - **Cell count:** 70 ### Physical - **Length:** 1900 mm - **Width:** 992 mm - **Thickness:** 30 mm - **Weight:** 20.0 kg - **Area:** 1.88 m2 - **Power density:** 222.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5403 of 14005 | | Power density | 5137 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 1771 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Highest efficiency among peers** - Maximum module efficiency reaches 22.28%, outperforming all listed peer comparables: GCL-M10/54H (21.5%), Phono Solar TWINPLUS (20.98%), and Solarspace SS8-54HSB (21.51%). The 0.77–1.30 percentage-point advantage translates into measurably higher energy yield per unit of roof area. - **N-type TOPCon cell technology** - N-type TOPCon cells exhibit lower Light Induced Degradation (LID) and better performance at elevated temperatures compared to older PERC cells. In practice this means a higher annual energy yield and a slower power decline over the system's lifetime. - **Half-cut cells + Multi Busbar (MBB)** - Half-cut cell architecture cuts internal resistance and reduces mismatch losses under partial shading. MBB design increases tolerance to microcracks and installation-induced mechanical stress, directly lowering hot-spot risk and field return rates. - **BNEF Tier-1 bankable manufacturer** - JA Solar has held continuous BNEF Tier-1 status for over 10 years and ships more than 80 GW annually. Bankable status means lenders accept these modules in non-recourse project financing, providing real assurance that the 25-year power warranty can be enforced. ## Cons - **Discontinued series (EOL 2023)** - The Monocrystalline60 series reached end-of-life in 2023 after an 11-year production run. Availability of new modules, spare parts, and direct OEM service support is limited, increasing operational risk for installations that will be under their 25-year power warranty for another two decades. - **Monofacial-only design** - No bifacial variant is offered, while the direct peer Solarspace SS8-54HSB (up to 420 Wp, 21.51% efficiency) is available as a bifacial module. In ground-mount and flat-roof installations with a reflective surface, bifacial modules typically deliver 5–12% additional annual yield at no increase in BoS cost. - **15-year product warranty — below current standard** - The 15-year product warranty falls well short of the benchmark set by current-generation TOPCon modules: Trina Vertex S+, Canadian Solar TOPHiKu6, and JA Deep Blue 4.0 all carry 25-year product warranties and 30-year power warranties. Any mechanical failure after year 15 is borne entirely by the system owner. ## About this series The JA Solar Monocrystalline60 series consists of 60-cell modules, designed to maximize energy production from a limited roof area and to ensure stable operation under real-world conditions. The use of **monocrystalline cells in a half-cut configuration** helps to minimize losses due to partial shading and improves the uniformity of module performance, resulting in more predictable energy production throughout the day. Thanks to **Multi Busbar (MBB) technology**, current is collected more effectively from the surface of the cells, and the module is better able to withstand micro-cracks and typical mounting stresses. This solution will be appreciated by installers who prioritize hassle-free installation and low risk of warranty claims. In practice, Monocrystalline60 also stands out due to its **better tolerance to mechanical loads** and **lower risk of hot spots**, which is important for roofs exposed to snow, wind, or local dirt. The series is suitable for residential and commercial installations, where a balance between efficiency, durability, and inverter performance is crucial. ## Notable figures - At 22.3% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - Power density of 222.8 W/m² matches the \*\*TOPCon 400-450W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 400-450W\*\* median - At 20.0 kg, this panel is 2.0 kg lighter than \*\*TOPCon 400-450W\*\* median (22.0 kg) - easier handling during installation - Ranked #5403 out of 14005 panels for efficiency in the database ## Questions ### Is the JA Solar Monocrystalline60 series still available? The JA Solar Monocrystalline60 series has been discontinued and is no longer in active production. Availability depends entirely on distributor stock levels. If you need comparable specs, ask your supplier about a current JA Solar replacement built on the same TOPCon cell technology. ### What is TOPCon technology and why was it used in the Monocrystalline60 series? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that reduces recombination losses at contact interfaces and improves module efficiency. In the Monocrystalline60 series, it enables a peak output of up to 420 Wp within a compact 60-cell format and delivers lower annual degradation compared to conventional PERC cells, translating into more energy yield over a 20–25 year lifespan. ### What warranty does the JA Solar Monocrystalline60 come with? JA Solar provides a 15-year product warranty and a 25-year linear power output warranty for the Monocrystalline60 series. The power warranty guarantees that output stays above JA Solar's specified minimum threshold for a full quarter-century, giving residential and commercial system owners solid financial protection across the entire operational lifespan. ### Do the half-cut cells and MBB technology in the Monocrystalline60 really help with partial shading? Yes. Half-cut cells split the module into two independently operating sections, so shading one half does not completely block production in the other. Multi Busbar (MBB) technology shortens the current path to the busbars, reducing resistive losses. The combined benefit is most noticeable on roofs with chimneys, dormers, or structures that cast partial shadows throughout the day. ### How many 420 Wp JA Solar Monocrystalline60 panels do I need for a single-family home? A single 420 Wp panel generates roughly 380–470 kWh per year depending on location and roof pitch. A household consuming 3,500–4,500 kWh annually typically needs 8–12 modules. The compact 60-cell format makes it easier to fit the required number of panels on smaller roof sections without sacrificing target system output. ### How well do JA Solar Monocrystalline60 panels handle snow and wind loads? The Monocrystalline60 series features enhanced mechanical load tolerance, which matters in climates with seasonal snowfall and strong winds. The half-cut cell layout also lowers hot-spot risk, reducing thermal stress under demanding conditions. Before installation, check the datasheet for the rated static and dynamic load capacity in Pa applicable to your specific region. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ns-380-420mh-70-1900-992-30-562abce8b15d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, +1.5 pp, +5 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, +1.5 pp, +5 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +1.4 pp, +15 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, +1.3 pp, +5 yr warranty | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, +1.3 pp, +5 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, +1.3 pp, +5 yr warranty | | [JA Solar NS-380MH-80](https://comparepv.com/panel/ja-solar-ns-380mh-80) | 380 W | -40 W, -2.1 pp | | [JA Solar NS-390MH-80](https://comparepv.com/panel/ja-solar-ns-390mh-80) | 390 W | -30 W, -1.6 pp | | [JA Solar NS-400MH-80](https://comparepv.com/panel/ja-solar-ns-400mh-80) | 400 W | -20 W, -1.1 pp | | [JA Solar NS-410MH-80](https://comparepv.com/panel/ja-solar-ns-410mh-80) | 410 W | -10 W, -0.5 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +55 W, +1.7 pp, +15 yr warranty | | [Maxeon SPR-MAX7-465](https://comparepv.com/panel/maxeon-spr-max7-465) | 465 W | +45 W, +1.2 pp, +15 yr warranty | | [Maxeon SPR-MAX6-440](https://comparepv.com/panel/maxeon-spr-max6-440) | 440 W | +20 W, +0.5 pp, +15 yr warranty | | [Maxeon SPR-MAX3-430-R](https://comparepv.com/panel/maxeon-spr-max3-430-r) | 430 W | Cooler, +0.4 pp, +15 yr warranty | | [Maxeon SPR-MAX6-435](https://comparepv.com/panel/maxeon-spr-max6-435) | 435 W | +15 W, +0.2 pp, +15 yr warranty | | [Maxeon SPR-MAX3-425-R](https://comparepv.com/panel/maxeon-spr-max3-425-r) | 425 W | Cooler, heavier, +15 yr warranty | --- Source: https://comparepv.com/panel/ja-solar-ns-420mh-80 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.