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NT12/66GDF-725 vs GCL-NT12/66GDF-740 16 of 19 identical Swap Change panels

GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF-740

GCL NT12/66GDF-725
NT12/66GDF-725
725 Wp 23.34 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
GCL GCL-NT12/66GDF-740
GCL-NT12/66GDF-740
740 Wp 23.82 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

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

The largest is module efficiency: 0.48 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 NT12/66GDF-725 GCL-NT12/66GDF-740 Difference
Module efficiency 23.34 % 23.82 % 0.48 pp more efficient
Power density 233.4 Wp/m² 238.2 Wp/m² 4.8 Wp/m² higher
Rated power 725 Wp 740 Wp 15 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.
NT12/66GDF-725
24,325 kWh
GCL-NT12/66GDF-740
24,828 kWh
Lifetime gap
503 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NT12/66GDF-725 GCL-NT12/66GDF-740
Standard test conditions 25 °C 100.0% of rated power 725 W 740 W
Cool, bright day 40 °C 95.7% of rated power 693 W 708 W
Typical summer roof 55 °C 91.3% of rated power 662 W 676 W
Hot roof 70 °C 87.0% of rated power 630 W 643 W
03

Full specification

Parameter NT12/66GDF-725 GCL-NT12/66GDF-740 Difference
Power and efficiency
Rated power 725 Wp 740 Wp +15 W for GCL-NT12/66GDF-740
Module efficiency 23.34 % 23.82 % +0.48 pp for GCL-NT12/66GDF-740
Power density 233.4 Wp/m² 238.2 Wp/m² +4.8 Wp/m² for GCL-NT12/66GDF-740
Open-circuit voltage 48.80 V 49.46 V Effectively the same
Voltage at max power 41.03 V 41.60 V Effectively the same
Short-circuit current 18.60 A 18.72 A Effectively the same
Current at max power 17.67 A 17.79 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 38.3 kg 38.2 kg Effectively the same
Weight per kWp 52.8 kg/kWp 51.6 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
#943 vs #418
GCL-NT12/66GDF-740 leads by 525 places
Power density
#936 vs #431
GCL-NT12/66GDF-740 leads by 505 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#6,514 vs #4,997
GCL-NT12/66GDF-740 leads by 1,517 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#403 vs #181
GCL-NT12/66GDF-740 leads by 222 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF-735
3 differences, the largest is module efficiency
Same series, other bin
GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF-730
The same specification on paper
Same series, other bin
GCL NT12/66GDF-725 vs GCL NT12/66GDF-730
The same specification on paper
Same series, other bin
GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF-725
The same specification on paper
Same series, other bin
GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF 725
The same specification on paper
Same series, other bin
GCL NT12/66GDF-725 vs GCL GCL-NT12/66GDF-720
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: GCL NT12/66GDF-725 or GCL GCL-NT12/66GDF-740?
According to our database: GCL GCL-NT12/66GDF-740 has higher module efficiency (23.82% vs 23.34%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL NT12/66GDF-725 and GCL GCL-NT12/66GDF-740?
GCL NT12/66GDF-725 has a module efficiency of 23.34%, while GCL GCL-NT12/66GDF-740 is 23.82%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL NT12/66GDF-725 use vs GCL GCL-NT12/66GDF-740?
GCL NT12/66GDF-725 uses TOPCon cells; GCL GCL-NT12/66GDF-740 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 NT12/66GDF-725 and GCL GCL-NT12/66GDF-740?
GCL NT12/66GDF-725 has a 30 years power warranty; GCL GCL-NT12/66GDF-740 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 NT12/66GDF-725 and GCL GCL-NT12/66GDF-740 bifacial panels?
Both GCL NT12/66GDF-725 and GCL GCL-NT12/66GDF-740 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.

Shop prices: See 6 GCL offers

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.