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GCL Brand review

GCL-NT12R/54GDF-490

490 Wp N-type Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 8,306 of 14,005
Compare panels Datasheet PDF
Power (Wp)
490
Strong · top 13%
Efficiency (%)
22.02
Weak · bottom 19%
Density (Wp/m²)
220.2
Weak · bottom 18%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
27.3
Weak · 3.6 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The GCL-NT12R/54GDF series consists of advanced modules utilizing innovative N-type TOPCon technology, which redefines performance standards in varying lighting conditions. Thanks to the use of R-type rectangular cells, these panels offer significantly higher power density, allowing for maximum utilization of limited roof space. The Dual-Glass construction not only increases resistance to micro-cracks and adverse weather conditions but also guarantees the highest fire safety class, which is a priority in modern prosumer installations. This solution effectively eliminates the problem of rapid power degradation, ensuring stable energy yields for many decades. The exceptional bifaciality of the modules allows for additional power generation from radiation reflected from the ground, which, combined with a very low temperature coefficient, sets this series apart from standard competition. GCL-NT12R/54GDF is the perfect choice for the most demanding investors seeking a balance between elegant aesthetics and extreme component durability. The applied rectangular cell technology optimizes the voltage parameters of the entire system, directly translating to a faster return on investment in specific Polish sunlight conditions. By choosing this series, every user gains a guarantee of trouble-free operation and full protection against extreme weather events, such as strong winds or hail.

Ranking

301 panels in the segment N-type 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.02% 22.52% Weak · bottom 19% 6,329
Power density 220.2 225.2 Weak · bottom 18% 6,321
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 55.7 49.5 Weak · bottom 11% 10,113
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 4 caution
Best for

Residential and commercial.

Not ideal for

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

Watch-outs
55.7 kg per kWp

Bottom 11% of the N-type 450-500 W segment, against a median of 49.5.

220.2 watts per square metre

Bottom 18% of the N-type 450-500 W segment, against a median of 225.2.

22.02% module efficiency

Bottom 19% of the N-type 450-500 W segment, against a median of 22.52%.

What owners get
N-type TOPCon with Rectangular (R) Cells

TOPCon technology reduces LID degradation to below 1% in the first year of operation (vs. 2–3% for PERC cells), while the rectangular R-type cells increase the active area within the module frame compared to standard M10 cells, enabling power density exceeding 220 W/m² in a 54-cell format.

30-Year Linear Power Warranty

The manufacturer guarantees stable output over 30 years, fully matching the warranty offered by JA Solar (JAM60S40 LR, 30 years) and surpassing older Trina Solar Vertex Backsheet series (25 years). The extended warranty horizon directly reduces financial risk when calculating the LCOE of a prosumer installation.

Bifacial Dual-Glass Construction

A glass backsheet in place of a polymer backsheet eliminates EVA and laminate degradation after 15–20 years of service. The bifacial design generates an additional 5–15% of energy from ground-reflected irradiance (albedo: concrete ~0.25, snow ~0.75), which in Polish winter conditions meaningfully increases the annual energy yield of ground-mounted systems.

BNEF Tier-1 Manufacturer with 35 Years of History

GCL-SI is listed as a Tier-1 manufacturer by Bloomberg NEF (bankable manufacturer), enabling non-recourse project financing through commercial banks. Founded in 1990, the company is one of the world's largest producers of solar cells and wafers, minimizing the risk of unavailable service or warranty claims over a 30-year horizon.

Efficiency in the Top Quartile of the 490–510 Wp Segment

Peak efficiency of 22.92% at 510 Wp places the series well above the Trina Solar Vertex Backsheet (21.2%), essentially on par with the Sunlike Solar SKT490–510M12-108D4 (22.93%), and only 0.08 percentage points below the JA Solar JAM60S40 LR (23.0%). The series is fully competitive with the top peers in its segment.

Trade-offs
Lower Variants Drop to 22.02% Efficiency

The 490 Wp module (the lowest-power variant in the series) achieves an efficiency of 22.02% — 0.91 percentage points below the peak 510 Wp variant and nearly 1 percentage point below the JA Solar JAM60S40 LR (23.0%). For a 10 kWp rooftop installation built from 490 Wp modules, the gap relative to the top-tier peer translates to approximately 40–50 W less installed peak power for the same roof area.

Notes from the database
  • At 22.0% efficiency, this panel is on par with typical N-type 450-500W modules
  • 220.2 W/m² power density is 5.0 W/m² below N-type 450-500W median (225.2 W/m²) - requires larger installation area
  • At -0.29%/°C, hot weather performance is typical for N-type 450-500W panels
  • Weight of 27.3 kg is 3.6 kg above N-type 450-500W median (23.7 kg) - verify structural support
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 490 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.02 % Weak Segment median 22.52%
Vmpp · Impp 32.76 V · 14.96 A Operating point at max power
Voc · Isc 39.00 V · 15.76 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1962×1134×30 mm · 2.22 m² of roof
Weight 27.3 kg Weak Weak · 3.6 kg above median
Cells 108 · N-type 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 428 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
GCL GCL-NT12R/54GDF-490 490 W 22.02% -0.290 27.3 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.0 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +2.8 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +2.7 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +2.5 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +2.5 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, lighter, +2.5 pp
GCL-NT12R/54GDF-495 495 W 22.25% -0.290 27.3 kg +0.2 pp
GCL-NT12R/54GDF-500 500 W 22.47% -0.290 27.3 kg +10 W, +0.4 pp
GCL-NT12R/54GDF-505 505 W 22.70% -0.290 27.3 kg +15 W, +0.7 pp
GCL-NT12R/54GDF-510 510 W 22.92% -0.290 27.3 kg +20 W, +0.9 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +70 W, cooler, +2.8 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +65 W, cooler, +2.6 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +60 W, lighter, +2.4 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg +50 W, lighter, +2.4 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg +50 W, lighter, +2.4 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +55 W, cooler, +2.2 pp

Found 471 panels of the same or similar size to this one, within ±10 mm. See them here Found 505 panels of the same or similar size to this one, within ±25 mm. See them here Found 657 panels of the same or similar size to this one, within ±50 mm. See them here Found 1471 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty applies to the GCL-NT12R/54GDF panels and what exactly does it cover?
The GCL-NT12R/54GDF series carries a 12-year product warranty against physical defects and material failures, along with a 30-year linear power output warranty. The latter guarantees that after 30 years of operation the panel will retain no less than 87.4% of its nominal power output. As a Tier 1 manufacturer, GCL backs these commitments with its full financial strength and long-standing presence in the global renewable energy market.
Does the N-type TOPCon technology in the GCL-NT12R/54GDF genuinely differ from conventional panels, and is the premium justified?
Yes, the difference is measurable. N-type TOPCon cells are boron-free, which eliminates the LID (Light Induced Degradation) defects characteristic of older P-type panels. In practice this translates to slower power degradation in the early years of operation and higher efficiency — the NT12R/54GDF series achieves approximately 22–23%. For the investor, this means a faster return on investment and higher energy yield over the entire operational lifetime.
How does the bifacial design of the GCL-NT12R/54GDF panels work, and when does it actually deliver a benefit?
The bifacial dual-glass construction allows the rear side of the panel to absorb light reflected from the ground or rooftop surface. The real power gain depends on the albedo of the surface beneath: a light-colored gravel bed or white roofing membrane can yield 5–15% additional energy annually. The effect is most pronounced in ground-mounted systems and on flat roofs with a light-colored surface. On a dark roof tile the benefit will be smaller, but the dual-glass construction still enhances the panel's long-term durability regardless.
Will the GCL-NT12R/54GDF panels perform reliably under Polish weather conditions — rain, frost, and hail?
Yes. The Dual-Glass construction — two panes of tempered glass in place of a rear backsheet — significantly improves resistance to moisture ingress, micro-cracks, and hail impact. The panels are certified to withstand a snow load of 5,400 Pa and wind pressure of up to 2,400 Pa, which meets Polish building code requirements. Additionally, the low temperature coefficient means that on cold but sunny winter days the modules operate more efficiently than older P-type panels, partially compensating for the reduced daylight hours.
What are the R-type rectangular cells used in the GCL-NT12R/54GDF series, and what advantage do they offer?
R-type rectangular cells are elongated silicon wafers cut from round ingots, which cover significantly more of the module's surface area than traditional cells with chamfered corners. As a result, the GCL-NT12R/54GDF achieves up to 510 W within a comparatively compact footprint, delivering higher power density per square meter of roof space. For installers working with limited mounting area, this means more installed capacity can be achieved without enlarging the racking structure.
Is GCL a reliable manufacturer, and is the NT12R/54GDF series available on the Polish market?
GCL (GCL System Integration Technology) is one of the largest PV cell and module manufacturers in the world, classified as Tier 1 by BloombergNEF — which confirms full bankability and the availability of project financing. The GCL-NT12R/54GDF series is actively in production and available for purchase. GCL products are distributed through numerous Polish renewable energy wholesalers, and IEC and MCS certifications allow installation under subsidy programs such as the Mój Prąd scheme.
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