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JA Solar Brand review

JAM60D41-485/LB

485 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 8,735 of 14,129
Compare panels Datasheet PDF
Power (Wp)
485
Strong · top 20%
Efficiency (%)
21.90
Weak · bottom 14%
Density (Wp/m²)
219.0
Weak · bottom 14%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
27.3
Weak · 3.3 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The JA Solar Deep Blue 4.0 Pro series represents a breakthrough in performance optimization thanks to the use of innovative n-type Bycium+ cells. The use of rectangular M10R silicon wafers allows for better utilization of the module surface, which directly translates into higher unit power while maintaining compact dimensions. SMBB (Super Multi-Busbar) technology drastically reduces resistive losses and improves current flow, making these panels an ideal solution for investors seeking maximum yields from limited roof space. Unlike older generations, this series offers exceptional resistance to LID and LeTID degradation, guaranteeing stable energy production for decades. Thanks to a low temperature coefficient, these modules maintain high efficiency even on hot days, effectively solving the problem of power drops in the Polish summer climate. This is a choice dedicated to both advanced prosumer installations and large-scale PV farms, where lowering the LCOE is of key importance. Precise refinement of the construction makes Deep Blue 4.0 Pro beat the competition in terms of efficiency in low-light conditions, offering real gains where standard p-type cells lose their effectiveness.

Ranking

1,096 panels in the segment TOPCon 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.90% 22.52% Weak · bottom 14% 6,847
Power density 219.0 225.2 Weak · bottom 14% 6,831
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 56.3 52.2 Weak · bottom 7% 10,636
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Residential, commercial and hot-climate.

Not ideal for

Weight-limited structures, roofs where every square metre has to count and tight roof space.

Watch-outs
56.3 kg per kWp

Bottom 7% of the TOPCon 450-500 W segment, against a median of 52.2. Ranked 10,636th in the whole database.

219.0 watts per square metre

Bottom 14% of the TOPCon 450-500 W segment, against a median of 225.2.

21.90% module efficiency

Bottom 14% of the TOPCon 450-500 W segment, against a median of 22.52%.

Notes from the database
  • At 21.9% efficiency, this panel is 0.6pp below the TOPCon 450-500W median of 22.5%
  • At 219.0 W/m², this panel generates 6.2 W/m² less per unit area than TOPCon 450-500W median (225.2 W/m²)
  • Temperature coefficient of -0.29%/°C matches the TOPCon 450-500W median
  • At 27.3 kg (3.3 kg above TOPCon 450-500W median of 24.0 kg), requires checking roof load capacity
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 485 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.90 % Weak Segment median 22.52%
Vmpp · Impp 36.28 V · 13.37 A Operating point at max power
Voc · Isc 43.25 V · 14.24 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1953×1134×30 mm · 2.21 m² of roof
Weight 27.3 kg Weak Weak · 3.3 kg above median
Cells 120 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
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 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 424 W guaranteed
Degradation 1.00 → 0.40 % 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 485 Wp appear here. The rest cover the whole series.

Linear Performance Warranty (n-type Bifacial Double Glass Module vs. Standard Module) Linear Performance Warranty (n-type Bifacial Double Glass Module vs. Standard Module) 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
-
With bifacial gain
-

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
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
JA Solar JAM60D41-485/LB 485 W 21.90% -0.290 27.3 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.1 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +2.9 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +2.8 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg Cooler, lighter, +2.8 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +2.6 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +2.6 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, lighter, +2.6 pp
JAM60D41 490/LB 490 W 22.10% -0.290 27.3 kg +0.2 pp
JAM60D41 495/LB 495 W 22.40% -0.290 27.3 kg +10 W, +0.5 pp
JAM60S40-500/LR 500 W 22.60% -0.290 24.3 kg +15 W, lighter, +0.7 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +75 W, cooler, +2.9 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +70 W, cooler, +2.7 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +65 W, lighter, +2.5 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg +55 W, lighter, +2.5 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg +55 W, lighter, +2.5 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +60 W, cooler, +2.4 pp

Found 488 panels of the same or similar size to this one, within ±10 mm. See them here Found 507 panels of the same or similar size to this one, within ±25 mm. See them here Found 1265 panels of the same or similar size to this one, within ±50 mm. See them here Found 1474 panels of the same or similar size to this one, within ±100 mm. See them here

About the Deep Blue 4.0 Pro 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 Deep Blue 4.0 Pro come with?
The Deep Blue 4.0 Pro carries a 12-year product warranty covering manufacturing defects and a 30-year linear power warranty. After 30 years, the module retains at least 87.4% of its rated power output. JA Solar's Tier 1 status and established market position provide confidence that warranty commitments will be honored throughout the full operational lifetime of your system.
Do JA Solar Deep Blue 4.0 Pro panels lose significant power on hot summer days?
The Deep Blue 4.0 Pro features an exceptionally low temperature coefficient of Pmax at just -0.29%/°C. When the module surface reaches 70°C on a hot day, power loss is approximately 12%, while older PERC modules typically lose 15-17%. This advantage is particularly valuable during peak summer months, translating into measurably higher energy yields compared to conventional p-type technology.
How does TOPCon technology in the Deep Blue 4.0 Pro compare to standard PERC cells?
The n-type Bycium+ TOPCon cells in Deep Blue 4.0 Pro achieve mass-production cell efficiency exceeding 25.3%, a level unattainable with PERC technology. The critical advantage is near-zero LID and LeTID degradation - a well-documented issue that reduced energy yields of p-type installations in their first years of operation. TOPCon delivers more stable, predictable power output across the full 30-year linear power warranty period.
Does the bifacial design of the Deep Blue 4.0 Pro deliver real energy gains on a residential pitched roof?
On a pitched roof, bifacial gain is limited since the rear side mainly captures diffuse and reflected light. Typical real-world bifacial yield improvement ranges from 3-8%, still adding several hundred extra kWh per year for a 10 kW system. Maximum bifacial gains are achieved in ground-mounted arrays over high-albedo surfaces or flat-roof ballasted systems using white membranes.
How many JA Solar Deep Blue 4.0 Pro panels do I need for a 10 kW system?
With a maximum power output of 510 Wp per module, exactly 20 panels are needed to reach 10 kW DC (20 × 510 Wp = 10,200 Wp). A standard 10 kW inverter handles this slight DC oversizing without issue. Before purchasing, your installer should verify roof orientation, usable surface area, and string layout against the inverter's MPPT input specifications.
How do JA Solar Deep Blue 4.0 Pro panels perform under overcast skies and low-light conditions?
Thanks to its n-type TOPCon Bycium+ cell architecture, the Deep Blue 4.0 Pro delivers noticeably higher efficiency at low irradiance levels (e.g., 200 W/m²) compared to standard PERC modules. The series earned a Very Good rating in pv magazine's module test, confirming superior energy yield under diffuse light. In climates with frequent cloud cover, this translates into a measurably higher annual energy output.
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