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JA Solar JAM66D45-625/LB
JA Solar Brand review

JAM66D45-625/LB

625 Wp TOPCon Bifacial 80%
ComparePV verdict

Solid all-round for its segment

Rank 2,270 of 14,005
Compare panels Datasheet PDF
Power (Wp)
625
Typical for its class
Efficiency (%)
23.10
Typical · median 22.80%
Density (Wp/m²)
231.4
Typical · median 227.7
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
33.1
Typical · median 32.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

The JA Solar DeepBlue 4.0 Pro series is a breakthrough in efficiency, based on advanced n-type cells in Bycium+ technology. This solution effectively eliminates light-induced degradation problems, which translates into stable energy production for decades. Thanks to the use of SMBB technology and high packing density, these panels offer significantly higher efficiency than standard p-type modules, while maintaining optimal dimensions for easy installation. The innovation of the series is demonstrated by an excellent temperature coefficient, which makes the installation work more efficiently on hot days, generating real savings for the investor. DeepBlue 4.0 Pro is a choice dedicated to demanding commercial and industrial installations, where a quick return on investment and maximizing yields from limited roof space are key. A distinguishing factor against the competition is the optimized module format, which allows for a reduction in BOS system costs while increasing the installed power. By choosing this series, the user receives a product with the highest mechanical reliability and excellent resistance to harsh weather conditions, guaranteeing energy security at the highest level.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.10% 22.80% Typical 1,570
Power density 231.4 227.7 Typical 1,513
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 53.0 53.1 Typical 6,680
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Price offers

1 from shops we track
Shop Country Price Per kWp Stock Offer updated Link to shop
SolVolte Sklep Poland 13 988 zł incl. VAT 22 380.80 zł/kWp In stock 22h ago Visit shop

Signals from the data

0 positive · 0 caution
Best for

Commercial, utility-scale and hot-climate.

Notes from the database
  • At 23.1% efficiency, this panel is on par with typical TOPCon 600-650W modules
  • At 231.4 W/m² power density, this panel generates 3.7 W/m² more per unit area than TOPCon 600-650W median (227.7 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 600-650W panels
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
  • In the top 11% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 625 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.10 % Typical Segment median 22.80%
Vmpp · Impp 40.45 V · 15.45 A Operating point at max power
Voc · Isc 48.70 V · 16.15 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 33.1 kg Typical Typical · median 32.7 kg
Cells 132 · 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 546 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 625 Wp appear here. The rest cover the whole series.

30-year Linear Performance Warranty 30-year Linear Performance Warranty Whole series Current-Voltage Curve JAM66D45-625/LB Current-Voltage Curve JAM66D45-625/LB 625 W Power-Voltage Curve JAM66D45-625/LB Power-Voltage Curve JAM66D45-625/LB 625 W

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 JAM66D45-625/LB 625 W 23.10% -0.290 33.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +2.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +50 W, lighter, +1.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.9 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +45 W, lighter, +1.7 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +45 W, lighter, +1.7 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +1.7 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +45 W, cooler, +1.7 pp
JAM66D45-605/LB 605 W 22.40% -0.290 33.1 kg -20 W, -0.7 pp
JAM66D45-610/LB 610 W 22.60% -0.290 33.1 kg -15 W, -0.5 pp
JAM66D45-615/LB 615 W 22.80% -0.290 33.1 kg -10 W, -0.3 pp
JAM66D45-620/LB 620 W 23.00% -0.290 33.1 kg Very close match
JAM66D45-630/LB 630 W 23.30% -0.290 33.1 kg Very close match
JAM66D45-635/LB 635 W 23.50% -0.290 33.1 kg +10 W, +0.4 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +55 W, lighter, +2.1 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +75 W, cooler, +1.9 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +70 W, cooler, +1.8 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the warranty on JA Solar DeepBlue 4.0 Pro panels?
The DeepBlue 4.0 Pro series comes with a 12-year product warranty covering material and manufacturing defects, and a 30-year power output warranty. After 30 years of operation, the panel is guaranteed to retain at least 87.4% of its nominal power, corresponding to an annual degradation rate of just 0.3%. This is one of the strongest performance guarantees available among n-type modules on the market.
What is Bycium+ cell technology used in the DeepBlue 4.0 Pro, and is the premium worth it?
Bycium+ is JA Solar's proprietary n-type TOPCon cell implementation. Compared to p-type PERC cells, it delivers a lower temperature coefficient (approx. -0.29%/°C), no light-induced degradation (LID), and better low-irradiance performance. In practice this translates to more kilowatt-hours generated annually from the same roof area, accelerating the return on investment compared to conventional PERC modules.
Are JA Solar DeepBlue 4.0 Pro panels bifacial, and how much extra energy can I expect from the rear side?
Yes, the DeepBlue 4.0 Pro is a bifacial dual-glass module. The rear side captures reflected irradiance (albedo), delivering 5–15% additional energy yield depending on the ground surface. The gain is most pronounced over light-colored surfaces such as gravel, light concrete, or snow. For ground-mount and industrial rooftop systems this is a real production boost at no additional module cost.
How does the DeepBlue 4.0 Pro 630W perform during hot summer days?
The TOPCon Bycium+ technology delivers a power temperature coefficient of approximately -0.29%/°C. When a panel heats up to 65°C on a hot day, power loss is around 11.6%, while conventional p-type PERC modules typically lose 13–14% under the same conditions. Over a full year this adds up to measurably higher energy production with no additional investment required.
Is the JA Solar DeepBlue 4.0 Pro 630W suitable for commercial or industrial flat-roof installations?
Yes, the 630W DeepBlue 4.0 Pro variant is designed primarily for large-scale C&I (commercial and industrial) installations. Its high unit power reduces the total module count and lowers Balance of System (BoS) costs. The module withstands snow loads up to 5400 Pa and wind pressure up to 2400 Pa, meeting structural requirements for industrial flat roofs with standard racking systems.
How does JA Solar DeepBlue 4.0 Pro compare to older p-type PERC panels from the same brand?
The fundamental difference is cell technology: DeepBlue 4.0 Pro uses n-type TOPCon (Bycium+) cells, whereas older JA Solar series relied on p-type PERC. N-type eliminates LID degradation, achieves module efficiency above 23%, has a better temperature coefficient, and delivers higher bifacial gain. In real-world terms this means more energy output over the entire system lifetime from a module of comparable physical size.
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