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GCL-NT12/66GDF-740 vs NT12/66GDF-720 16 of 19 identical Swap Change panels

GCL GCL-NT12/66GDF-740 vs GCL NT12/66GDF-720

GCL GCL-NT12/66GDF-740
GCL-NT12/66GDF-740
740 Wp 23.82 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
GCL NT12/66GDF-720
NT12/66GDF-720
720 Wp 23.18 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

GCL-NT12/66GDF-740 leads on the differences that matter

The largest is module efficiency: 0.64 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter GCL-NT12/66GDF-740 NT12/66GDF-720 Difference
Module efficiency 23.82 % 23.18 % 0.64 pp more efficient
Power density 238.2 Wp/m² 231.8 Wp/m² 6.4 Wp/m² higher
Rated power 740 Wp 720 Wp 20 W more power
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
GCL-NT12/66GDF-740
24,828 kWh
NT12/66GDF-720
24,157 kWh
Lifetime gap
671 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario GCL-NT12/66GDF-740 NT12/66GDF-720
Standard test conditions 25 °C 100.0% of rated power 740 W 720 W
Cool, bright day 40 °C 95.7% of rated power 708 W 689 W
Typical summer roof 55 °C 91.3% of rated power 676 W 657 W
Hot roof 70 °C 87.0% of rated power 643 W 626 W
03

Full specification

Parameter GCL-NT12/66GDF-740 NT12/66GDF-720 Difference
Power and efficiency
Rated power 740 Wp 720 Wp +20 W for GCL-NT12/66GDF-740
Module efficiency 23.82 % 23.18 % +0.64 pp for GCL-NT12/66GDF-740
Power density 238.2 Wp/m² 231.8 Wp/m² +6.4 Wp/m² for GCL-NT12/66GDF-740
Open-circuit voltage 49.46 V 48.58 V Effectively the same
Voltage at max power 41.60 V 40.84 V Effectively the same
Short-circuit current 18.72 A 18.55 A Effectively the same
Current at max power 17.79 A 17.63 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 38.2 kg 38.3 kg Effectively the same
Weight per kWp 51.6 kg/kWp 53.2 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#418 vs #1,424
GCL-NT12/66GDF-740 leads by 1,006 places
Power density
#431 vs #1,347
GCL-NT12/66GDF-740 leads by 916 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#4,997 vs #7,025
GCL-NT12/66GDF-740 leads by 2,028 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#181 vs #540
GCL-NT12/66GDF-740 leads by 359 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF-735
The same specification on paper
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF-730
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL NT12/66GDF-730
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF-725
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL NT12/66GDF-725
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF 725
3 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: GCL GCL-NT12/66GDF-740 or GCL NT12/66GDF-720?
According to our database: GCL GCL-NT12/66GDF-740 has higher module efficiency (23.82% vs 23.18%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12/66GDF-740 and GCL NT12/66GDF-720?
GCL GCL-NT12/66GDF-740 has a module efficiency of 23.82%, while GCL NT12/66GDF-720 is 23.18%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-NT12/66GDF-740 use vs GCL NT12/66GDF-720?
GCL GCL-NT12/66GDF-740 uses TOPCon cells; GCL NT12/66GDF-720 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on GCL GCL-NT12/66GDF-740 and GCL NT12/66GDF-720?
GCL GCL-NT12/66GDF-740 has a 30 years power warranty; GCL NT12/66GDF-720 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are GCL GCL-NT12/66GDF-740 and GCL NT12/66GDF-720 bifacial panels?
Both GCL GCL-NT12/66GDF-740 and GCL NT12/66GDF-720 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.