GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12R/66GDF-625
VS
The verdict
NT12/66GDF-740 leads on the differences that matter
The largest is module efficiency: 0.68 pp more efficient. 11 of 19 comparable parameters are identical.
See all 8 differencesHow alike are they
11
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
8 of 19 parameters
What actually differs
Parameter
NT12/66GDF-740
NT12R/66GDF-625
Difference
Module efficiency
23.82 %
23.14 %
0.68 pp more efficient
Rated power
740 Wp
625 Wp
115 W more power
Weight
38.2 kg
32.5 kg
5.7 kg lighter
Power density
238.2 Wp/m²
231.4 Wp/m²
6.8 Wp/m² higher
Short-circuit current
18.72 A
16.00 A
2.72 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Current at max power
17.79 A
15.20 A
2.59 A apart
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
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-740
24,828 kWh
NT12R/66GDF-625
20,970 kWh
Lifetime gap
3,858 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NT12/66GDF-740
NT12R/66GDF-625
Standard test conditions
25 °C
100.0% of rated power
740 W
625 W
Cool, bright day
40 °C
95.7% of rated power
708 W
598 W
Typical summer roof
55 °C
91.3% of rated power
676 W
571 W
Hot roof
70 °C
87.0% of rated power
643 W
543 W
03
Full specification
Parameter
NT12/66GDF-740
NT12R/66GDF-625
Difference
Power and efficiency
Rated power
740 Wp
625 Wp
+115 W for NT12/66GDF-740
Module efficiency
23.82 %
23.14 %
+0.68 pp for NT12/66GDF-740
Power density
238.2 Wp/m²
231.4 Wp/m²
+6.8 Wp/m² for NT12/66GDF-740
Open-circuit voltage
49.46 V
48.55 V
Effectively the same
Voltage at max power
41.60 V
41.12 V
Effectively the same
Short-circuit current
18.72 A
16.00 A
2.72 A apart
Current at max power
17.79 A
15.20 A
2.59 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
38.2 kg
32.5 kg
-5.7 kg for NT12R/66GDF-625
Weight per kWp
51.6 kg/kWp
52.0 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
14,129 panels
Against the whole database
Efficiency
#447
vs
#1,554
NT12/66GDF-740 leads by 1,107 places
Power density
#460
vs
#1,558
NT12/66GDF-740 leads by 1,098 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#5,026
vs
#5,449
NT12/66GDF-740 leads by 423 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#181
vs
#2,266
NT12/66GDF-740 leads by 2,085 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: GCL GCL-NT12/66GDF-740 or GCL GCL-NT12R/66GDF-625?
According to our database: GCL GCL-NT12/66GDF-740 has higher module efficiency (23.82% vs 23.14%). 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 GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF-740 has a module efficiency of 23.82%, while GCL GCL-NT12R/66GDF-625 is 23.14%. 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 GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF-740 uses TOPCon cells; GCL GCL-NT12R/66GDF-625 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 GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF-740 has a 30 years power warranty; GCL GCL-NT12R/66GDF-625 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 GCL-NT12R/66GDF-625 bifacial panels?
Both GCL GCL-NT12/66GDF-740 and GCL GCL-NT12R/66GDF-625 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.