--- title: "JA Solar NS-420MH-108 420W Solar Panel - Specs & Review | ComparePV" description: "JA Solar NS-420MH-108 420W solar panel. Specs: 21.01% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-ns-420mh-108" updated: 2026-09-11 --- # JA Solar NS-420MH-108 Middle of its segment, modest efficiency 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** NS-420MH-108 - **Series:** Monocrystalline 144 (datasheet title) - **Rated power:** 420 W - **Cell technology:** TOPCon - **Bifacial:** yes ## 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 | 21.01% | 22.00% | Weak - bottom 6% | 9,744 | | Power density | 210.2 | 220.2 | Weak - bottom 6% | 9,728 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 24.5 kg | 22.0 kg | Weak - bottom 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.01% | 22.00% | Weak - bottom 6% | 9,744 | | Power density | 210.2 | 220.2 | Weak - bottom 6% | 9,728 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 58.3 | 51.4 | Weak - bottom 8% | 11,670 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.01% module efficiency** - Bottom 6% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 9,744th in the whole database. - **210.2 watts per square metre** - Bottom 6% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 9,728th in the whole database. - **58.3 kg per kWp** - Bottom 8% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,670th in the whole database. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.01 % - **Voltage at Pmax (Vmp):** 32.84 V - **Current at Pmax (Imp):** 12.79 A - **Open-circuit voltage (Voc):** 39.23 V - **Short-circuit current (Isc):** 13.55 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:** 108 - **Bifacial:** yes ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.5 kg - **Area:** 2.00 m2 - **Power density:** 210.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9744 of 14005 | | Power density | 9728 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 11670 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cell technology** - N-type TOPCon cells exhibit significantly lower light-induced degradation (LID) and a better temperature power coefficient than legacy PERC, delivering measurably higher annual energy yield — especially in summer when module temperatures routinely exceed 50°C. - **Bifacial design** - Modules harvest irradiance from both sides; on high-albedo surfaces (gravel, concrete, snow) this yields an additional 5–20% energy gain relative to a monofacial module of the same front-side nameplate power, effectively lowering the installation's LCOE. - **30-year linear power warranty** - JA Solar guarantees a linear power output for a full 30 years — longer than the 25-year standard common among peer comparables produced in 2019–2022. The extended power warranty simplifies bankability for non-recourse project financing. - **BNEF Tier 1 — fully bankable** - JA Solar has maintained BNEF Tier 1 status for over a decade and remains on the list in 2026. For debt- or lease-financed installations, this ensures lender acceptance without additional manufacturer credit enhancements. - **Up to 23.02% efficiency — top of segment** - The best variant of this series reaches 23.02% efficiency, matching the segment leader among peer comparables (SunKean SKT440~460M12-96D4: 23.02%) and outperforming Risen RSM96-11 (23.0%) and Zonergy ZPM MH3-72 (21.16%). High efficiency reduces the roof or ground area required for a given peak power target. ## Cons - **Series discontinued (2022)** - The Monocrystalline 144 line ended production in 2022 (launched 2019). New modules are available only from distributor stock; JA Solar no longer provides active technical support for this series or guarantees prompt RMA replacement of defective units. For installations planned after 2025, this complicates capacity expansion and matching of identical modules. - **Product warranty only 15 years** - The product (workmanship) warranty covers only 15 years, while JA Solar's current lineups (DeepBlue 4.0, JAM54D40) and Tier 1 competition now standardly offer 25 years. Given a 30-year installation lifetime, the 10-year warranty gap represents a tangible financial risk for the end investor. ## About this series The JA Solar Monocrystalline 144 series consists of half-cut cell modules, designed to effectively minimize energy losses under typical operating conditions. The use of a **half-cut** design improves panel performance under partial shading and reduces the risk of hot spots, leading to more stable daily energy production. Another key feature of this series is **PERC technology**, along with a multi-busbar architecture for connecting cells, which allows the modules to better capture light under cloudy conditions and in the morning and evening. Depending on the variant, you can find **bifacial** versions that can utilize reflected light from the ground - a significant advantage on bright roofs, gravel-covered ground, or carport installations. In addition, the **robust mechanical resistance** makes it easy to select panels for demanding locations, while the modern connection box and IP-rated sealing enhance safety during operation. This is a good choice for homes, businesses, and farms where predictable performance and durability are key. ## Notable figures - Module efficiency of 21.0% is 1.0pp below average for \*\*TOPCon 400-450W\*\* panels (median: 22.0%) - 210.2 W/m² power density is 10.0 W/m² below \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - requires larger installation area - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 400-450W\*\* median - Weight of 24.5 kg is 2.5 kg above \*\*TOPCon 400-450W\*\* median (22.0 kg) - verify structural support - #9744 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### Is the JA Solar Monocrystalline 144 series still available for purchase? The JA Solar Monocrystalline 144 series has been discontinued and is no longer actively distributed. If you need similar specs, ask your installer or distributor about current JA Solar equivalents — newer series use the same half-cut cell architecture with comparable or improved efficiency and full warranty support. ### What warranty does the JA Solar Monocrystalline 144 series carry? JA Solar provides a 15-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty guaranteeing at least 80–87% of rated power after three decades of operation. These are strong terms for a Tier 1 manufacturer and give long-term predictability for energy yield calculations. ### What is TOPCon technology in the JA Solar Monocrystalline 144 panels, and how does it differ from PERC? TOPCon (Tunnel Oxide Passivated Contact) cells add an ultra-thin oxide layer at the rear contact to minimize carrier recombination. Compared to PERC, this delivers higher module efficiency, a lower temperature coefficient, and better high-temperature performance — a key advantage when summer module temperatures regularly exceed 50°C, reducing LCOE over the system lifetime. ### How well do JA Solar Monocrystalline 144 panels handle partial shading? Very well. The half-cut layout splits the module into two independent electrical halves, so shading one section does not shut down the entire panel. Multi busbar interconnection further reduces hot-spot risk and resistive losses. This makes the series a practical choice for rooftops affected by chimneys, dormers, or nearby trees, without requiring a per-panel MPPT optimizer in every case. ### Is the bifacial version of the JA Solar Monocrystalline 144 worth choosing for a ground-mount or carport system? Yes. For ground-mounted systems with a high-albedo surface — white gravel, concrete, or a light geotextile membrane — and for carport installations, the bifacial gain typically adds 5–15% to annual energy yield at no extra panel cost. On a sloped roof the rear side receives little reflected irradiance, so the benefit is minimal there. Maximum bifacial gain is achieved with white gravel ground cover and a tilt angle above 15°. ### What is the peak power of JA Solar Monocrystalline 144 panels, and how many modules does a home installation require? Peak output in this series reaches up to 460 Wp per module. A typical single-family home consuming around 4,000 kWh per year usually needs 8–12 panels, equating to a 4–6 kWp system. The exact count depends on roof orientation, tilt angle, geographic location, and planned additional loads such as EV charging or a home battery storage system. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ns-420-460mh-108-1762-1134-30-bifacial-cb40200e09fe.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, lighter, +2.8 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.8 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.7 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, lighter, +2.6 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, lighter, +2.6 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, lighter, +2.6 pp | | [JA Solar JAM54D41-430/LB](https://comparepv.com/panel/ja-solar-jam54d41-430-lb-1) | 430 W | +10 W, lighter, +0.5 pp | | [JA Solar JAM54S40-435/LR](https://comparepv.com/panel/ja-solar-jam54s40-435-lr) | 435 W | +15 W, lighter, +0.8 pp | | [JA Solar JAM54S40-440/LR](https://comparepv.com/panel/ja-solar-jam54s40-440-lr) | 440 W | +20 W, lighter, +1.0 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +4.0 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, lighter, +3.8 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, lighter, +3.5 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +80 W, cooler, +3.5 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +80 W, lighter, +3.5 pp | --- Source: https://comparepv.com/panel/ja-solar-ns-420mh-108 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.