--- title: "JA Solar NS-585MH-144 Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar NS-585MH-144 solar panel. Specs: 22.63% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-ns-585mh-144" image: "https://comparepv.com/og/panel/ja-solar-ns-585mh-144.png" updated: 2026-09-11 --- # JA Solar NS-585MH-144 Light for its output, short guarantee 256 panels in the segment N-type 550-600 W ## Identity - **Manufacturer:** JA Solar - **Model:** NS-585MH-144 - **Series:** Monocrystalline 144 - **Rated power:** 585 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 550-600 W (256 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 585 W | 580 W | Typical | | | Module efficiency | 22.63% | 22.45% | Typical | 3,679 | | Power density | 226.4 | 224.5 | Typical | 3,689 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 26.0 kg | 30.2 kg | Strong - top 2% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 9% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.63% | 22.45% | Typical | 3,679 | | Power density | 226.4 | 224.5 | Typical | 3,689 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 44.4 | 52.5 | Strong - top 2% | 455 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 9% | 9,912 | ### Strengths - **44.4 kg per kWp** - Top 2% of the N-type 550-600 W segment, against a median of 52.5. Ranked 455th in the whole database. ### Watch out for - **25 year performance warranty** - Bottom 9% of the N-type 550-600 W segment, against a median of 30 yrs. Ranked 9,912th in the whole database. - **Best for:** Residential, commercial, utility-scale and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 585 W - **Efficiency:** 22.63 % - **Voltage at Pmax (Vmp):** 42.98 V - **Current at Pmax (Imp):** 13.62 A - **Open-circuit voltage (Voc):** 51.40 V - **Short-circuit current (Isc):** 14.58 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:** 144 ### Physical - **Length:** 2279 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 26.0 kg - **Area:** 2.58 m2 - **Power density:** 226.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3679 of 14129 | | Power density | 3689 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 455 of 14129 | | Warranty | 9912 of 14129 | ## Pros - **N-type TOPCon cell technology** - N-type silicon eliminates LID/LeTID (no boron-oxygen complex due to phosphorus doping), ensuring stable output from day one. The guaranteed degradation rate of ~0.40%/yr is significantly lower than the ~0.55%/yr typical of P-type PERC, resulting in measurably higher cumulative energy yield across the 25-year linear power warranty. - **Up to 22.63% efficiency - top-tier segment** - Peak module efficiency of 22.63% (585 Wp variant) is on par with the best peer comparables in the 144-cell TOPCon segment: Hanersun Hitouch 5N (22.65%), Risen RSM144-9 (22.60%), and Q-SUN Qrystal N8 (22.65%). The series ranks in the top 10% of the segment with no meaningful efficiency disadvantage. - **BNEF Tier-1 bankable status (Q1 2026)** - JA Solar holds a continuous BNEF Tier-1 designation (March 2026 methodology), making its modules eligible for non-recourse project finance by international banks. With over 80 GW of annual production capacity and operations since 2005, counterparty risk over the 25-year power warranty period is minimal. - **9 variants from 430-585 Wp with half-cut MBB architecture** - A broad power range across 9 SKUs covers applications from small residential rooftops to C&I installations without overloading MPPT inputs. The half-cut 144-cell layout with multi-busbar (MBB) architecture shortens current paths, reduces resistive losses, and lowers hot-spot risk under partial shading conditions. ## Cons - **Only 15-year product warranty** - The 2024-2026 market standard for N-type TOPCon modules is a 25-year product warranty, offered by Jinko Tiger Neo, LONGi Hi-MO 6, and JA Solar's own flagship DeepBlue 4.0 Pro (25-year product + 30-year performance). The Monocrystalline 144 series' 15-year product coverage is a disadvantage in competitive tenders and bank due diligence evaluations. - **Monofacial only - no bifacial rear-side gain** - Direct peer comparable Risen RSM144-9-560-585BNDG is a bifacial N-type TOPCon dual-glass module capable of generating an additional 5-15% energy from reflected irradiance at suitable albedo conditions. The JA Solar Monocrystalline 144 (is\_bifacial: false) does not offer this option, reducing its competitiveness for ground-mount and flat-roof installations with reflective surfaces. ## About this series The JA Solar Monocrystalline 144 series consists of modules based on a 144-cell configuration in a half-cut design, specifically engineered to function reliably even under less-than-ideal roof conditions. The use of **PERC monocrystalline cells** and **MBB multi-shed architecture** improves power generation and reduces losses, resulting in more predictable annual energy production. A key advantage is **reduced sensitivity to partial shading** - the half-cut design helps maintain performance when shadows from chimneys, antennas, or neighboring buildings "cut through" a portion of the module. The half-cut design also **minimizes the risk of hot spots**, and the enhanced mechanical strength increases safety under wind and snow loads. This makes it a good choice for residential and commercial installations, especially on roofs with many orientations, where high power density and reliability are paramount, without compromising on performance compared to competitors. ## Notable figures - Efficiency of 22.6% matches the \*\*N-type 550-600W\*\* median - At 226.4 W/m² power density, roof space requirements are typical for \*\*N-type 550-600W\*\* panels - Temperature coefficient of -0.29%/°C matches the \*\*N-type 550-600W\*\* median - 26.0 kg weight - 4.3 kg lighter than \*\*N-type 550-600W\*\* median (30.3 kg), reducing installation effort - In the top 26% for efficiency among all N-type panels ## Questions ### What warranty does the JA Solar Monocrystalline 144 series come with? The JA Solar Monocrystalline 144 series includes a 15-year product warranty and a 25-year linear power output warranty. The manufacturer guarantees a defined minimum power yield for a quarter century, which is a key figure when calculating the return on investment for a residential or commercial solar installation. ### How does the JA Solar Monocrystalline 144 handle partial shading from a chimney or antenna? The half-cut cell design splits each cell in two, so shade from a chimney, antenna, or neighboring building affects only a portion of the module without shutting down the remaining section. This results in higher annual energy yield compared to conventional full-cell panels, especially on multi-slope roofs with multiple obstructions. ### What is TOPCon technology used in this series and is it worth the premium? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that minimizes carrier recombination at the silicon surface, achieving higher efficiency than older PERC cells. In practice, TOPCon modules perform better under overcast and diffuse-light conditions, carry a lower temperature coefficient, and degrade more slowly over time - meaningfully increasing energy yield across the full warranty period. ### Is the JA Solar Monocrystalline 144 a bifacial panel? No, the JA Solar Monocrystalline 144 in this configuration is not a bifacial module. It collects energy from the front side only. This suits standard rooftop installations where the rear surface has no meaningful exposure to reflected irradiance, and where the priority is a reliable 585 Wp rated output and straightforward integration with common racking systems. ### Is JA Solar a reliable manufacturer, and will they honor warranties 15 years from now? JA Solar is a Chinese manufacturer headquartered in Beijing, active in the solar industry since 2005 and consistently ranked as a Tier 1 supplier by independent agencies including Bloomberg NEF. Tier 1 status reflects documented financial stability and the capacity to fulfill long-term warranty obligations - directly relevant when relying on a 25-year power guarantee. ### How many JA Solar Monocrystalline 144 panels rated at 585 Wp do I need for a 5-6 kWp home system? At 585 Wp per module, just 9-11 panels are enough to build a 5-6 kWp system. The high per-panel wattage means fewer modules and a smaller roof footprint compared to lower-wattage alternatives - a key advantage when available roof area is limited or partially obstructed. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ns-565-585mh-144-2279-1134-30-a9df52be886c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, +2.2 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -30 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | Heavier, +1.8 pp, +5 yr warranty | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Lighter, +1.8 pp, +5 yr warranty | | [JA Solar JAM72D30-525/MB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-525-mb-1500v) | 525 W | -60 W, hotter, -2.3 pp | | [JA Solar JAM72S30-530/MR](https://comparepv.com/panel/ja-solar-jam72s30-530-mr) | 530 W | -55 W, hotter, -2.1 pp | | [JA Solar JAM72S30-535/MR](https://comparepv.com/panel/ja-solar-jam72s30-535-mr) | 535 W | -50 W, hotter, -1.9 pp | | [JA Solar JAM72S30-540/MR](https://comparepv.com/panel/ja-solar-jam72s30-540-mr) | 540 W | -45 W, hotter, -1.7 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +65 W, +2.6 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +60 W, +2.4 pp, +5 yr warranty | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +55 W, +2.2 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/ja-solar-ns-585mh-144 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.