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JA Solar JAT54S40-475/LR
JA Solar Brand review

JAT54S40-475/LR

475 Wp TOPCon
ComparePV verdict

Light for its output, no clear weak spot

Rank 5,636 of 14,005
Compare panels Datasheet PDF
Power (Wp)
475
Typical for its class
Efficiency (%)
23.80
Strong · top 3%
Density (Wp/m²)
237.7
Strong · top 3%
Temp (%/°C)
-0.260
Strong · top 3%
Weight (kg)
19.3
Strong · 4.7 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

JA Solar JAT54S40 LR series modules are monofacial solar panels based on N-type TOPCon cells, designed for stable energy production in real rooftop conditions. The key advantage is their very low LID degradation, ensuring the installation maintains high efficiency for a longer period without the typical drop-off after commissioning. In practice, this means more predictable yields and better profitability throughout the system's lifespan.

Another notable feature is the improved temperature coefficient, which minimizes power losses on hot days - particularly important for dark rooftops and installations with poor ventilation. The modules utilize the GFI (gapless) structure, supporting efficient surface utilization and an aesthetic appearance. An additional benefit is optimized performance under low-light conditions, which aids during transitional periods and light cloud cover.

This is an excellent choice for single-family homes, multi-family buildings, and commercial projects, where durability, reliable performance, and high workmanship standards matter.

Ranking

1,089 panels in the segment TOPCon 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.80% 22.52% Strong · top 3% 433
Power density 237.7 225.2 Strong · top 3% 467
Temperature coefficient -0.260 -0.290 Strong · top 3% 511
Weight per kWp 40.6 52.2 Strong · top 1% 165
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 2 caution
Best for

Residential, commercial, shaded-installations and hot-climate.

Strengths
40.6 kg per kWp

Top 1% of the TOPCon 450-500 W segment, against a median of 52.2. Ranked 165th in the whole database.

23.80% module efficiency

Top 3% of the TOPCon 450-500 W segment, against a median of 22.52%. Ranked 433rd in the whole database.

237.7 watts per square metre

Top 3% of the TOPCon 450-500 W segment, against a median of 225.2. Ranked 467th in the whole database.

What owners get
N-type TOPCon – low LID and superior thermal performance

N-type TOPCon cells exhibit first-year LID degradation below 1%, compared to 1.5–2% typical for P-type PERC. The improved temperature coefficient (~-0.30%/°C vs. ~-0.35%/°C for PERC) reduces power losses on hot days — particularly relevant for rooftop installations with limited airflow.

23.5–24.3% efficiency – top of the 54-cell segment

Peak efficiency of 24.3% matches the best available peers (Gokin GK-5-54HG / GK-5-54HGb: 24.3%) and exceeds the ZNShine ZXM7-UHLD120 series (22.47%) by over 1.8 percentage points. In practice this translates to ~8% more energy output per unit of roof area compared to lower-efficiency alternatives.

30-year linear power warranty

JA Solar guarantees a linear degradation schedule for 30 years, placing this series at the premium end of N-type module warranty terms. A 30-year power guarantee improves LCOE predictability and is a key bankability requirement for commercial project financing.

BNEF Tier-1 bankable manufacturer (Q1 2026)

JA Solar maintains continuous BNEF Tier-1 status and belongs to the group of manufacturers shipping over 80 GWp annually (H1 2026). Tier-1 standing is required by most non-recourse project finance lenders, facilitating debt financing for commercial PV installations using this module.

GFI (gapless) cell layout – maximized active area

The GFI design eliminates inter-cell gaps, increasing the active surface area per module and delivering a uniform, all-black aesthetic. This is a meaningful advantage for architecturally sensitive projects (residential and multi-family buildings) without sacrificing power output.

Trade-offs
15-year product warranty – below market standard

The JAT54S40 LR series carries a 15-year workmanship/product warranty, whereas most competing N-type TOPCon modules from Tier-1 manufacturers (Jinko Tiger Neo, Trina Vertex S+, Canadian Solar HiHero) now offer 25-year product warranties as standard. The 10-year gap in defect coverage is a tangible risk factor for installations planned over a 25–30-year lifecycle.

Monofacial only – no rear-side energy gain

The series is strictly monofacial (is_bifacial: false), whereas the peer-comparable Gokin GK-5-54HGb offers a bifacial variant at the same peak power of 485 W and identical 24.3% efficiency. On high-albedo substrates (white gravel, light-colored roofing), bifacial modules can yield 5–15% additional energy. The JAT54S40 LR is not the optimal choice for such installations.

Notes from the database
  • Efficiency of 23.8% is 1.3pp above the TOPCon 450-500W median (22.5%)
  • Power density of 237.7 W/m² packs 12.5 W/m² more into the same footprint vs TOPCon 450-500W median (225.2 W/m²)
  • -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures
  • Weight of 19.3 kg (4.7 kg below TOPCon 450-500W median of 24.0 kg) allows easier transport and roof mounting
  • Ranked #433 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 475 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.80 % Strong Segment median 22.52%
Vmpp · Impp 34.87 V · 13.63 A Operating point at max power
Voc · Isc 41.03 V · 14.90 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 19.3 kg Strong Strong · 4.7 kg below median
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.260 %/°C Strong top 3% of its segment
Coefficient Voc · Isc -0.220 · 0.050 %/°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 83.5 % Equals 394 W guaranteed
Degradation 1.00 → 0.55 % First year, then annual

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 475 Wp appear here. The rest cover the whole series.

30-year Linear Performance Warranty 30-year Linear Performance Warranty 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
-0.260 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
JA Solar JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +35 W, heavier, +1.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +20 W, heavier, +1.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +30 W, heavier, +0.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +15 W, heavier, +0.7 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +25 W, heavier, +0.7 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +25 W, heavier, +0.7 pp
NS-420MH-108 420 W 21.01% -0.290 24.5 kg -55 W, heavier, -2.8 pp
JAM54D41-430/LB 430 W 21.50% -0.290 22.0 kg -45 W, hotter, -2.3 pp
JAM54S40-435/LR 435 W 21.80% -0.290 20.0 kg -40 W, hotter, -2.0 pp
JAM54S40-440/LR 440 W 22.00% -0.290 20.0 kg -35 W, hotter, -1.8 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 JAT54S40 LR come with, and what exactly does it cover?
The JAT54S40 LR series carries a 15-year product warranty covering manufacturing defects and a 30-year power output warranty. After 30 years of operation the module is guaranteed to retain at least 88.85% of its rated power. The product warranty protects against material and workmanship defects, while the power warranty safeguards against excessive degradation throughout the system's operational life.
What is TOPCon technology in the JAT54S40 LR panels and is it worth the premium?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that minimizes carrier recombination at the silicon-metal interface. For the JAT54S40 LR this translates to module efficiency up to 24.3%, very low LID degradation at startup, and an improved temperature coefficient of -0.26%/°C compared to standard PERC cells. For a rooftop installation it means higher energy yield over the entire system lifetime.
Do the JA Solar JAT54S40 LR panels perform well in cloudy conditions and low irradiance?
Yes. The JAT54S40 LR series is optimized for low-light performance. N-type TOPCon cells respond better to diffuse irradiance than PERC-based modules, which matters in climates with frequent overcast days. The modules begin generating meaningful power at irradiance levels of just a few dozen watts per square meter, helping to improve annual energy yield during transitional seasons.
What is the power output of the JAT54S40 LR and how many panels are needed for a home installation?
Each JAT54S40 LR module delivers up to 485 Wp at STC. A typical 6.5 kWp residential system requires about 14 panels, while a 10 kWp system needs approximately 21 modules. The high per-panel wattage means fewer modules are needed compared to older PERC products, which is a real advantage when roof space is limited.
Is the JAT54S40 LR a bifacial panel that generates power from both sides?
No. The JAT54S40 LR is a monofacial module and generates electricity only from its front surface. This makes it a straightforward choice for standard rooftop installations where the rear side is not exposed to reflected light. Compared to bifacial modules it is simpler to plan and price, while the N-type TOPCon cell technology still delivers high efficiency of 23.3–24.3%.
How does low LID degradation in the JAT54S40 LR affect the return on investment?
LID (Light-Induced Degradation) is the power drop that conventional silicon cells experience during their first hours of sun exposure. The N-type TOPCon cells used in the JAT54S40 LR are virtually immune to this effect, so the module operates close to its rated power from day one. For a rooftop system this means higher energy output in the early years and more predictable LCOE compared to older P-type modules.
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