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JA Solar Brand review

NS-420MH-108

420 Wp TOPCon Bifacial
ComparePV verdict

Middle of its segment, modest efficiency

Rank 10,610 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.01
Weak · bottom 6%
Density (Wp/m²)
210.2
Weak · bottom 6%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
24.5
Weak · 2.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 5 caution
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.

Watch-outs
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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.01 % Weak Segment median 22.00%
Vmpp · Impp 32.84 V · 12.79 A Operating point at max power
Voc · Isc 39.23 V · 13.55 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1762×1134×30 mm · 2.00 m² of roof
Weight 24.5 kg Weak Weak · 2.5 kg above median
Cells 108 · TOPCon 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 30 years Typical median 30 yrs · 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 420 Wp appear here. The rest cover the whole series.

30-Year Linear Power Warranty 30-Year Linear Power Warranty 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-420MH-108 420 W 21.01% -0.290 24.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, lighter, +2.8 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.8 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.7 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, lighter, +2.6 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, lighter, +2.6 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, lighter, +2.6 pp
JAM54D41-430/LB 430 W 21.50% -0.290 22.0 kg +10 W, lighter, +0.5 pp
JAM54S40-435/LR 435 W 21.80% -0.290 20.0 kg +15 W, lighter, +0.8 pp
JAM54S40-440/LR 440 W 22.00% -0.290 20.0 kg +20 W, lighter, +1.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +4.0 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, lighter, +3.8 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.7 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, lighter, +3.5 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.5 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, lighter, +3.5 pp

Found 1395 panels of the same or similar size to this one, within ±10 mm. See them here Found 1425 panels of the same or similar size to this one, within ±25 mm. See them here Found 3614 panels of the same or similar size to this one, within ±50 mm. See them here Found 3962 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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