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JA Solar JAM54S40-435/LR
JA Solar Brand review

JAM54S40-435/LR

435 Wp TOPCon
ComparePV verdict

Light for its output, no clear weak spot

Rank 9,533 of 14,005
Compare panels Datasheet PDF
Power (Wp)
435
Typical for its class
Efficiency (%)
21.80
Typical · median 22.00%
Density (Wp/m²)
217.7
Typical · median 220.2
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
20.0
Strong · 2.0 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

JA Solar JAM54S40 LR series are modern monofacial modules in the 54-cell format, designed for rooftop installations where maximum yield from limited surface area is crucial. The application of n-type TOPCon cells helps maintain high efficiency in real-world conditions and minimizes losses due to natural degradation over time, translating to more predictable energy production for years.

Against many competitive solutions, it stands out thanks to its GFI (gapless) technology, which supports better active cell surface utilization and aesthetics, particularly important for residential homes and multi-family buildings. This is an excellent proposition for investors seeking more power output from the same number of panels, while simultaneously expecting stable performance on hot days and during weaker sunshine periods.

The JAM54S40 LR will prove suitable for homes, apartment communities, and small businesses - everywhere where long-term reliability and high efficiency without compromising structural compromises are a priority.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.80% 22.00% Typical 7,022
Power density 217.7 220.2 Typical 7,066
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 46.0 51.4 Strong · top 6% 942
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 2 caution
Best for

Residential, commercial and hot-climate.

Strengths
46.0 kg per kWp

Top 6% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 942nd in the whole database.

What owners get
N-type TOPCon Cell Technology

N-type TOPCon cells deliver a temperature coefficient of -0.29%/°C versus a typical -0.35%/°C for PERC, translating into measurably higher energy yield on hot days. Reduced LID and LeTID degradation ensures stable output throughout the module's full operational lifetime.

Up to 23% Efficiency — Segment Leader

Peak module efficiency of 23% places this series at the top of its peer group: on par with Risen RSM96-11-440-460BNDG (23%) and SunKean SKT440~460M12-96D4 (23.02%), and 1.84 percentage points above Zonergy ZPM MH3-72 (21.16%). On a 20 m² rooftop, the gap vs. Zonergy translates to approximately 370 Wp of additional installed capacity.

30-Year Linear Power Warranty ≥87.4%

JA Solar guarantees at least 87.4% of rated power output after 30 years, with an annual degradation rate of 0.4% post-year-one. This ranks among the stronger long-term power guarantees in the 54-cell N-type segment and directly supports favorable LCOE calculations for long-horizon investments.

GFI (Gapless) Cell Technology

GFI technology minimizes inter-cell gaps, maximizing the active cell area and improving module aesthetics. Combined with the 182 mm 54-cell format, this enables higher installed wattage per rooftop square meter compared to standard 60-cell PERC layouts.

BNEF Tier-1 Manufacturer for 20+ Years

JA Solar (founded 2005) consistently appears on BloombergNEF's Tier-1 bankable manufacturers list, reducing credit risk for non-recourse financed projects. A global service network including EU offices ensures warranty support availability across the full 30-year power guarantee period.

Trade-offs
Monofacial Design Only

The JAM54S40 LR series offers no bifacial gain. The competing Risen RSM96-11-440-460BNDG at the same power class (460 Wp) and efficiency (23%) is bifacial — in installations with light-colored ground surfaces or agri-PV setups, this can add 5–15% additional energy yield. For ground-mounted prosumer systems, a bifacial alternative in the same price bracket is worth evaluating.

15-Year Product Warranty

The standard 15-year workmanship and materials warranty falls short of premium manufacturers offering 25 years (e.g., REC Alpha, Panasonic EVERVOLT). In a typical prosumer installation with a 20–25-year investment horizon, any manufacturing defect arising after year 15 is not covered and remains the owner's liability.

Notes from the database
  • Efficiency of 21.8% matches the TOPCon 400-450W median
  • Power density of 217.7 W/m² matches the TOPCon 400-450W median
  • At -0.29%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • At 20.0 kg, this panel is 2.0 kg lighter than TOPCon 400-450W median (22.0 kg) - easier handling during installation
  • In the top 50% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 435 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.80 % Typical Segment median 22.00%
Vmpp · Impp 32.29 V · 13.47 A Operating point at max power
Voc · Isc 38.70 V · 14.23 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 20.0 kg Strong Strong · 2.0 kg below 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
End-of-warranty output 87.4 % Equals 380 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

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 JAM54S40-435/LR 435 W 21.80% -0.290 20.0 kg You are here
JAT54S40-485/LR 485 W 24.30% -0.260 19.3 kg +50 W, cooler, +2.5 pp
AIKO-A485-MCE54Mw 485 W 24.30% -0.260 21.0 kg +50 W, cooler, +2.5 pp
AIKO-A485-MAH54Mw 485 W 24.30% -0.260 21.5 kg +50 W, cooler, +2.5 pp
GK-5-54HG-485M 485 W 24.30% -0.260 21.0 kg +50 W, cooler, +2.5 pp
ZEUS 3.0+ 108 485WP 485 W 24.30% -0.260 24.2 kg +50 W, heavier, +2.5 pp
NS-420MH-108 420 W 21.01% -0.290 24.5 kg -15 W, heavier, -0.8 pp
JAM54D41-430/LB 430 W 21.50% -0.290 22.0 kg Heavier, -0.3 pp
JAM54S40-440/LR 440 W 22.00% -0.290 20.0 kg Very close match
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +75 W, cooler, +3.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +60 W, cooler, +3.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +70 W, cooler, +2.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +55 W, cooler, +2.7 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +65 W, cooler, +2.7 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +65 W, cooler, +2.7 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
What warranty does the JA Solar JAM54S40 LR series come with, and what does it cover?
The JAM54S40 LR series includes a 15-year product warranty covering workmanship, laminate, and frame, along with a 30-year linear power warranty. JA Solar guarantees the panel will retain at least 87.4% of its rated output after 30 years. As a Tier 1 manufacturer, JA Solar has the financial standing to honor these commitments throughout the full operational life of the system.
What is TOPCon technology in the JAM54S40 LR series and what does it mean in real-world use?
TOPCon (Tunnel Oxide Passivated Contact) is an n-type cell technology featuring a lower power temperature coefficient (approx. −0.29%/°C) and reduced light-induced degradation (LID) compared to standard PERC cells. In practice, the JAM54S40 LR generates more annual energy than a same-wattage PERC module and degrades more slowly over decades, which directly improves the overall return on investment.
Do the JAM54S40 LR panels perform well during hot summer days?
Yes. Thanks to n-type TOPCon technology, the temperature coefficient of power for this series is approximately −0.29%/°C, compared to around −0.35%/°C for typical PERC cells. On hot days when roof-mounted module temperatures exceed 60°C, this difference translates into measurably higher energy output. The JAM54S40 LR is therefore a better choice than older-generation modules for installations in warm climates.
Is the JA Solar JAM54S40 LR suitable for a standard sloped roof on a single-family home?
Yes, this series is specifically designed for sloped residential rooftops. The modules measure 1762 × 1134 × 30 mm and weigh approximately 21–22 kg, which is within the load limits of standard roof structures. They are compatible with conventional mid-clamp and end-clamp mounting hardware, and the compact 54-cell format makes it easier to optimize the number of panels across limited roof space.
What is GFI technology in the JAM54S40 LR panels and does it affect roof aesthetics?
GFI (Gapless Film Integration) eliminates visible gaps between solar cells, increasing the active cell area relative to the total module surface and giving the panel a uniform, clean appearance. For homeowners, this has a dual benefit: the module looks more consistent on the roof, and the denser cell packing contributes to a slightly higher energy yield per square meter of available roof space.
Are the JAM54S40 LR panels monofacial or bifacial, and does it matter for a rooftop installation?
The JAM54S40 LR series is monofacial, collecting light from one side only. For typical sloped roof installations with a tile or membrane surface, bifacial modules offer no practical advantage due to the absence of ground reflection. A monofacial module is simpler to install, more cost-effective, and fully sufficient for the vast majority of residential prosumer systems.
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