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JA Solar JAM66D45-650/LB
JA Solar Brand review

JAM66D45-650/LB

650 Wp TOPCon Bifacial 80%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,171 of 14,129
Compare panels Datasheet PDF
Power (Wp)
650
Weak · bottom 13%
Efficiency (%)
24.10
Strong · top 17%
Density (Wp/m²)
240.6
Strong · top 20%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
33.1
Typical · median 34.6 kg
Warranty (yrs)
30
Typical · median 30 yrs

JA Solar JAM66D45 LB series modules are designed for installations where maximum energy yield and long-term peace of mind are key considerations - on commercial and industrial rooftops as well as in large PV farms. The use of N-type TOPCon cells helps minimize power losses over time and improves performance in demanding conditions, such as high temperatures or lower irradiance. The bifacial design allows for utilizing reflected light from the backside, effectively increasing energy production without expanding the installation. Additionally, double glazing enhances resistance to atmospheric factors and mechanical stress, which is crucial for investments with a long horizon. From a total cost perspective, this product stands out due to its approach focused on low energy cost in the lifecycle and predictable performance. It is an excellent choice for investors who wish to combine high reliability proven in tests with modern technology and the potential for additional gain from the rear side of the module.

Ranking

254 panels in the segment TOPCon 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.10% 22.40% Strong · top 17% 241
Power density 240.6 223.7 Strong · top 20% 255
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 50.9 53.1 Typical 4,322
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

7 positive · 1 caution
Best for

Commercial, utility-scale and shaded-installations.

Strengths
24.10% module efficiency

Top 17% of the TOPCon 650-700 W segment, against a median of 22.40%.

240.6 watts per square metre

Top 20% of the TOPCon 650-700 W segment, against a median of 223.7.

What owners get
Up to 24.1% efficiency - peer-group leader

The JAM66D45 LB series reaches a module efficiency of up to 24.1%, outperforming all direct peer comparables: Astronergy ASTRO N5 (23.3%), BYD AURO N (23.25%), and Jinko Solar Tiger Neo 66HL4M-BDX (24.06%). The margin over the peer-group median is approximately 0.7-0.85 percentage points, directly reducing area requirements and BoS cost per kWp.

N-type TOPCon - zero LID, better Tcoeff

N-type TOPCon cells eliminate Light-Induced Degradation (LID) inherent to P-type PERC. The power temperature coefficient is approximately -0.29%/°C (per ENF/manuals.plus data), versus -0.34 to -0.35%/°C for standard PERC - translating into measurably higher energy yield on hot summer days, especially relevant for C&I rooftop and utility-scale deployments.

Bifacial dual-glass - 5-15% additional yield

A bifaciality factor of ~85% enables 5-15% additional energy harvest from albedo, depending on ground surface (concrete, light gravel). The dual-glass construction (30 mm frame) raises mechanical resistance to 5,400 Pa (snow load) and 2,400 Pa (wind), while the IP68-rated junction box guards against PID-driven humidity degradation across the full 30-year operating life.

30-year linear power warranty

JA Solar guarantees retention of >87% of rated power after 30 years under a linear degradation schedule. This is among the longest warranty horizons available in the bifacial dual-glass 650 W segment and directly improves LCOE for long-duration projects - particularly relevant for non-recourse financed utility-scale PV farms.

JA Solar Tier 1 - #1 Wood Mackenzie H1 2025

JA Solar is listed on the BNEF Tier 1 bankable manufacturers list and ranked first in the Wood Mackenzie Global Solar Module Manufacturer Ranking for H1 2025 with an overall score of 91.7/100. This translates directly into stronger project bankability, lower residual risk for institutional investors, and easier access to non-recourse project financing.

Trade-offs
~33 kg weight - roof structure requirements

The dual-glass module weighs approximately 33.1 kg versus ~26-28 kg for comparable single-glass modules of similar wattage. Retrofit installations on existing C&I rooftops require structural load assessments on a case-by-case basis, adding engineering costs and potentially limiting applicability on buildings with lightweight steel purlins.

Notes from the database
  • Efficiency of 24.1% is 1.7pp above the TOPCon 650-700W median (22.4%)
  • At 240.6 W/m² power density, this panel generates 16.9 W/m² more per unit area than TOPCon 650-700W median (223.7 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 650-700W panels
  • Weight of 33.1 kg (1.5 kg below TOPCon 650-700W median of 34.6 kg) allows easier transport and roof mounting
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 650 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.10 % Strong Segment median 22.40%
Vmpp · Impp 41.67 V · 16.30 A Operating point at max power
Voc · Isc 49.97 V · 17.99 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 34.6 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 88.4 % Equals 568 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
-
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 JAM66D45-650/LB 650 W 24.10% -0.290 33.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.1 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +30 W, lighter, +1.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +0.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +0.9 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +50 W, cooler, +0.9 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +25 W, cooler, +0.9 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +45 W, cooler, +0.8 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +0.7 pp
JAM66D45-605/LB 605 W 22.40% -0.290 33.1 kg -45 W, -1.7 pp
JAM66D45-610/LB 610 W 22.60% -0.290 33.1 kg -40 W, -1.5 pp
JAM66D45-615/LB 615 W 22.80% -0.290 33.1 kg -35 W, -1.3 pp
JAM66D45-620/LB 620 W 23.00% -0.290 33.1 kg -30 W, -1.1 pp
JAM66D45-625/LB 625 W 23.10% -0.290 33.1 kg -25 W, -1.0 pp
JAM66D45-630/LB 630 W 23.30% -0.290 33.1 kg -20 W, -0.8 pp
JAM66D45-635/LB 635 W 23.50% -0.290 33.1 kg -15 W, -0.6 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +0.7 pp

Found 1144 panels of the same or similar size to this one, within ±10 mm. See them here Found 1150 panels of the same or similar size to this one, within ±25 mm. See them here Found 1261 panels of the same or similar size to this one, within ±50 mm. See them here Found 1942 panels of the same or similar size to this one, within ±100 mm. See them here

About the JAM66D45 LB 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 JAM66D45 LB series come with?
The JAM66D45 LB series comes with a 12-year product warranty covering materials and workmanship, plus a 30-year linear power output warranty. After 30 years, the module is guaranteed to retain approximately 83% of its nominal output. This is one of the longer warranty standards available on the market, especially relevant for commercial rooftop and utility-scale investments with long payback horizons.
What is TOPCon technology and why does the JAM66D45 LB series use it?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that uses a thin tunnel oxide layer to minimize carrier recombination at the cell contacts. In practice, this delivers higher module efficiency (up to ~23.3%), a lower temperature coefficient (~-0.29%/°C), and slower power degradation over time compared to PERC cells. The JAM66D45 LB series uses TOPCon specifically to lower the lifetime cost of energy (LCOE) from the installation.
How do the bifacial JAM66D45 LB panels increase energy production, and when does it make sense?
The JAM66D45 LB modules feature up to 80% bifaciality, meaning the rear side captures light reflected from the surface beneath the array. With a high-albedo ground cover - light gravel, concrete, or snow - this can add roughly 5-15% to energy output compared to a monofacial module of the same nominal power. The actual gain depends on site albedo, tilt angle, and mounting height above ground.
Is the JAM66D45 LB series suitable for large-scale utility PV farms?
Yes, utility-scale installations are one of the primary use cases for this series. The modules support a 1500 V DC system voltage, simplifying string design and reducing BoS costs. Front snow load resistance of 5,400 Pa and rear wind load of 2,400 Pa make them suitable for demanding locations. The double-glass construction and N-type TOPCon technology ensure predictable production throughout the full investment lifecycle.
How does the JAM66D45 LB series perform in high-temperature conditions?
The power temperature coefficient for the JAM66D45 LB is approximately -0.29%/°C, meaning the module loses about 2.9% of its rated output for every 10°C rise above 25°C. This outperforms most PERC modules, which typically show around -0.35%/°C. The N-type TOPCon technology helps maintain higher production on hot days - particularly important on dark industrial rooftops with limited airflow.
What are the dimensions and weight of the JAM66D45 LB module, and is it compatible with standard racking systems?
The JAM66D45 LB module measures 2382 × 1134 × 30 mm and weighs approximately 33.1 kg. This is a commercial and utility-scale format - its size and weight require a properly engineered racking system and appropriate lifting equipment during installation. It is not a standard fit for small residential rooftop systems on typical pitched roofs.
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