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JA Solar NS-585MH-144
JA Solar Brand review

NS-585MH-144

585 Wp N-type
ComparePV verdict

Light for its output, short guarantee

Rank 4,450 of 14,129
Compare panels Datasheet PDF
Power (Wp)
585
Typical for its class
Efficiency (%)
22.63
Typical · median 22.45%
Density (Wp/m²)
226.4
Typical · median 224.5
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
26.0
Strong · 4.2 kg below median
Warranty (yrs)
25
Weak · bottom 9%

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.

Ranking

256 panels in the segment N-type 550-600 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 3 caution
Best for

Residential, commercial, utility-scale and shaded-installations.

Not ideal for

Owners who want a long output guarantee.

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-outs
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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 585 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.63 % Typical Segment median 22.45%
Vmpp · Impp 42.98 V · 13.62 A Operating point at max power
Voc · Isc 51.40 V · 14.58 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2279×1134×30 mm · 2.58 m² of roof
Weight 26.0 kg Strong Strong · 4.2 kg below median
Cells 144 · N-type Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 25 years Weak bottom 9% · median 30 yrs

Datasheet charts

Open datasheet PDF

Measured curves published by JA Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 585 Wp appear here. The rest cover the whole series.

Linear Power Warranty Degradation Chart Linear Power Warranty Degradation Chart Whole series Current-Voltage Curver Current-Voltage Curver Whole series Power-Voltage Curver Power-Voltage Curver Whole series Voltage current curve at different temperatures Voltage current curve at different temperatures Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
JA Solar NS-585MH-144 585 W 22.63% -0.290 26.0 kg You are here
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, +2.2 pp, +5 yr warranty
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg -30 W, +2.0 pp, +5 yr warranty
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg +50 W, +2.0 pp, +5 yr warranty
AIKO-A630-MAH72Dw 630 W 24.40% -0.260 32.5 kg Heavier, +1.8 pp, +5 yr warranty
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg Lighter, +1.8 pp, +5 yr warranty
JAM72D30-525/MB/1500V 525 W 20.30% -0.350 31.8 kg -60 W, hotter, -2.3 pp
JAM72S30-530/MR 530 W 20.50% -0.350 27.3 kg -55 W, hotter, -2.1 pp
JAM72S30-535/MR 535 W 20.70% -0.350 27.3 kg -50 W, hotter, -1.9 pp
JAM72S30-540/MR 540 W 20.90% -0.350 27.3 kg -45 W, hotter, -1.7 pp
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +65 W, +2.6 pp, +5 yr warranty
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +60 W, +2.4 pp, +5 yr warranty
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +55 W, +2.2 pp, +5 yr warranty

Found 2327 panels of the same or similar size to this one, within ±10 mm. See them here Found 2369 panels of the same or similar size to this one, within ±25 mm. See them here Found 2383 panels of the same or similar size to this one, within ±50 mm. See them here Found 2543 panels of the same or similar size to this one, within ±100 mm. See them here

About the Monocrystalline 144 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

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.
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