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GCL Brand review

GCL-NH12/66GDF-720

720 Wp HJT Bifacial 90%
ComparePV verdict

Solid all-round for its segment

Rank 339 of 14,005
Compare panels Datasheet PDF
Power (Wp)
720
Typical for its class
Efficiency (%)
23.20
Typical · median 23.02%
Density (Wp/m²)
231.8
Typical · median 230.2
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
37.9
Typical · median 38.3 kg
Warranty (yrs)
30
Typical · median 30 yrs

The GCL-NH12/66GDF series utilizes advanced n-type TOPCon cell technology, which effectively eliminates the problem of light-induced degradation, translating into stable energy production for decades. Thanks to the bifacial dual-glass design, these modules also absorb radiation from the rear side, significantly increasing total energy yield, especially on surfaces with high albedo. This solution is a direct response to the needs of investors seeking maximum power density while maintaining the highest mechanical durability. The use of SMBB technology improves current flow and minimizes resistance losses, distinguishing this model from standard market solutions. These panels are primarily dedicated to large-scale photovoltaic farms and industrial installations where the lowest levelized cost of energy (LCOE) matters. The robust construction resistant to extreme weather conditions makes this series perform excellently in harsh environments, reducing the risk of micro-cracks. By choosing these modules, you gain the assurance of operation based on a high bifaciality factor, making them one of the most cost-effective options in the premium segment for the professional energy sector.

Ranking

222 panels in the segment HJT 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.20% 23.02% Typical 1,306
Power density 231.8 230.2 Typical 1,347
Temperature coefficient -0.240 -0.240 Typical 13
Weight per kWp 52.6 53.6 Typical 6,266
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 · 1 caution
Best for

Utility-scale and commercial.

What owners get
Lowest Temperature Coefficient in Its Class

HJT technology delivers a Pmax temperature coefficient of -0.24%/°C, significantly better than typical TOPCon modules (-0.29 to -0.32%/°C). At a cell operating temperature of 65°C, this translates to approximately 2–2.5% higher energy yield compared to competing TOPCon modules in the same power class.

30-Year Power Warranty ≥88.27%

The manufacturer guarantees ≥88.27% of nominal power output after 30 years of operation. This represents a meaningful advantage over the current market standard for TOPCon modules (~87.4% at 30 years) and especially over legacy PERC models (84.8% at 25 years), directly reducing LCOE for utility-scale PV projects.

High Bifacial Factor of HJT Technology

HJT cells achieve a bifaciality factor of typically 80–85%, well above TOPCon modules (70–75%). For installations on high-reflectance surfaces (albedo ≥0.3), this translates to a real annual energy gain of 8–15% above the front-side nominal output, at no additional cost.

Efficiency Up to 23.2% — Top of Peer Group

The top variant of the series (720 Wp) achieves 23.2% efficiency, matching the DMEGC DMxxxG12T-B66HSW and exceeding the Gamko New Energy GKA210N132 and Renesola RS9-700~720NBG-E1 (both at 23.18%) by 0.02 percentage points. The series therefore ranks among the absolute leaders in the 720 Wp segment.

GCL Tier 1 BNEF — Bankable Manufacturer

GCL-SI is consistently ranked as a Tier 1 manufacturer by BloombergNEF (Q1 2026 list confirmed), enabling non-recourse project financing through commercial banks and significantly reducing due diligence risk for industrial and utility-scale PV developers.

Trade-offs
Weight of 37.9 kg — Installation Requirements

The dual-glass construction increases module weight to 37.9 kg, compared to approximately 28–32 kg for backsheet modules of similar power output. This requires a two-person installation crew or specialized lifting equipment, which may increase Balance of System (BoS) costs by 5–10% per module in rooftop installation segments.

Notes from the database
  • At 23.2% efficiency, this panel is on par with typical HJT 700-750W modules
  • Power density of 231.8 W/m² matches the HJT 700-750W median
  • At -0.24%/°C, hot weather performance is typical for HJT 700-750W panels
  • Bifaciality factor of 90% can add 4-14% extra yield with reflective mounting surface
  • In the top 9% for efficiency among all HJT panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 720 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.20 % Typical Segment median 23.02%
Vmpp · Impp 42.70 V · 16.87 A Operating point at max power
Voc · Isc 50.60 V · 17.67 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 37.9 kg Typical Typical · median 38.3 kg
Cells 132 · HJT Monocrystalline
Bifaciality 90 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.3 % Equals 636 W guaranteed
Degradation 1.00 → 0.37 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by GCL in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 720 Wp appear here. The rest cover the whole series.

I-V Curve at Different Temperature (720W) I-V Curve at Different Temperature (720W) 720 W I-V/P-V Curve at Different Irradiation (720W) I-V/P-V Curve at Different Irradiation (720W) 720 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
-0.240 %/°C against a segment median of -0.240
-
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-NH12/66GDF-720 720 W 23.20% -0.240 37.9 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg -40 W, lighter, +2.0 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -45 W, lighter, +1.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Hotter, lighter, +1.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg -25 W, lighter, +1.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -50 W, lighter, +1.6 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -50 W, lighter, +1.6 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -50 W, lighter, +1.6 pp
GCL-M12/66GDF-655W 655 W 21.10% -0.350 38.5 kg -65 W, hotter, -2.1 pp
GCL-M12/66H-660W 660 W 21.20% -0.350 34.2 kg -60 W, hotter, -2.0 pp
GCL-M12/66H-665W 665 W 21.40% -0.350 34.2 kg -55 W, hotter, -1.8 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +85 W, hotter, +1.9 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +80 W, hotter, +1.7 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +75 W, hotter, +1.6 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +70 W, hotter, +1.4 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +40 W, hotter, +1.3 pp
AIKO-A785-GRH78Dw 785 W 24.40% -0.260 39.8 kg +65 W, hotter, +1.2 pp

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Common questions

6 answered
What warranty does the GCL-NH12/66GDF series carry and what does it cover?
The GCL-NH12/66GDF series comes with a 15-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. After 30 years of operation, the module retains at least 88.27% of its nominal power output. This extended power warranty horizon is made possible by n-type TOPCon cells, which exhibit exceptionally low annual degradation rates, directly translating into predictable return on investment for utility-scale farms and industrial installations.
Are GCL-NH12/66GDF modules suitable for large-scale solar farms or only for small installations?
The GCL-NH12/66GDF series is designed primarily for utility-scale PV farms and industrial installations. A maximum power output of up to 720 Wp and module efficiency of up to 23.2% deliver high power density per unit area. The bifacial dual-glass construction further increases total energy yield, lowering the levelized cost of energy (LCOE) and shortening the investment payback period in the utility-scale segment.
How does the bifacial dual-glass design work in the GCL-NH12/66GDF series and how much additional energy can be gained?
The GCL-NH12/66GDF bifacial module generates electricity from both its front and rear surfaces by absorbing light reflected from the ground or surrounding surfaces. On light-colored ground, white roofing membranes, or snow-covered terrain, the additional rear-side yield can range from a few to over ten percent annually. The two glass layers replace the conventional backsheet, significantly improving mechanical durability and protecting the cells against moisture ingress throughout the full 30-year service life.
What is the temperature coefficient of the GCL-NH12/66GDF and does the panel lose power on hot days?
The GCL-NH12/66GDF series achieves a Pmax temperature coefficient of -0.24%/°C, placing it among the top performers on the market. By comparison, older p-type PERC modules typically exhibit -0.35%/°C. In practice, this means that during summer months, when cell temperature exceeds 25°C, GCL-NH12/66GDF modules produce noticeably more energy than standard modules — an advantage that is particularly pronounced during extended, high-irradiance summer seasons.
What is the SMBB technology used in the GCL-NH12/66GDF and why is it superior to conventional busbars?
SMBB, or Super Multi Busbar, is a cell interconnection approach in which cells are connected by a large number of very thin conductors instead of the 5 or 6 wide busbars used in conventional designs. This shortens the current path, reducing resistive losses within the cell. The thinner conductors also reduce mechanical stress on the cell, minimizing the risk of micro-cracks during transportation, installation, and long-term operation under demanding weather conditions.
How much does the GCL-NH12/66GDF module weigh and do I need a reinforced mounting structure?
The GCL-NH12/66GDF module weighs approximately 37.9 kg with dimensions of 2384 × 1303 × 33 mm. It is heavier than a typical backsheet module due to its dual-glass construction, so it is advisable to verify the load-bearing capacity of the roof or ground-mount substructure with a structural engineer before purchase. For ground-mount farms and utility-scale installations, the greater rigidity of the dual-glass frame is an advantage, as it provides superior resistance to high winds and hail loads without risk of deformation.
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