GCL GCL-NT12R/48BGDF-440 vs GCL GCL-NT12/66GDF-730
VS
The verdict
NT12/66GDF-730 leads on the differences that matter
The largest is module efficiency: 1.48 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
NT12R/48BGDF-440
NT12/66GDF-730
Difference
Module efficiency
22.02 %
23.50 %
1.48 pp more efficient
Rated power
440 Wp
730 Wp
290 W more power
Power density
220.2 Wp/m²
235.0 Wp/m²
14.8 Wp/m² higher
Weight
21.5 kg
38.2 kg
16.7 kg lighter
Open-circuit voltage
35.38 V
49.02 V
13.64 V apart
Short-circuit current
15.48 A
18.64 A
3.16 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight per kWp
48.9 kg/kWp
52.3 kg/kWp
3.5 kg/kWp lighter
Voltage at max power
29.85 V
41.22 V
11.37 V apart
Current at max power
14.74 A
17.71 A
2.97 A apart
Cell count
96
132
36 cells apart
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 mm
02
What it means on a roof
Thirty years of production
Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, 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.
NT12R/48BGDF-440
14,763 kWh
NT12/66GDF-730
24,493 kWh
Lifetime gap
9,730 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NT12R/48BGDF-440
NT12/66GDF-730
Standard test conditions
25 °C
100.0% of rated power
440 W
730 W
Cool, bright day
40 °C
95.7% of rated power
421 W
698 W
Typical summer roof
55 °C
91.3% of rated power
402 W
666 W
Hot roof
70 °C
87.0% of rated power
383 W
635 W
03
Full specification
Parameter
NT12R/48BGDF-440
NT12/66GDF-730
Difference
Power and efficiency
Rated power
440 Wp
730 Wp
+290 W for NT12/66GDF-730
Module efficiency
22.02 %
23.50 %
+1.48 pp for NT12/66GDF-730
Power density
220.2 Wp/m²
235.0 Wp/m²
+14.8 Wp/m² for NT12/66GDF-730
Open-circuit voltage
35.38 V
49.02 V
13.64 V apart
Voltage at max power
29.85 V
41.22 V
11.37 V apart
Short-circuit current
15.48 A
18.64 A
3.16 A apart
Current at max power
14.74 A
17.71 A
2.97 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2384x1303x33 mm
1762x1134x30 mm vs 2384x1303x33 mm
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight
21.5 kg
38.2 kg
-16.7 kg for NT12R/48BGDF-440
Weight per kWp
48.9 kg/kWp
52.3 kg/kWp
-3.5 kg/kWp for NT12R/48BGDF-440
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
96
132
36 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#6,329
vs
#716
NT12/66GDF-730 leads by 5,613 places
Power density
#6,328
vs
#800
NT12/66GDF-730 leads by 5,528 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#2,535
vs
#5,805
NT12R/48BGDF-440 leads by 3,270 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#9,743
vs
#312
NT12/66GDF-730 leads by 9,431 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-NT12R/48BGDF-440 or GCL GCL-NT12/66GDF-730?
According to our database: GCL GCL-NT12/66GDF-730 has higher module efficiency (23.50% vs 22.02%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12R/48BGDF-440 and GCL GCL-NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-440 has a module efficiency of 22.02%, while GCL GCL-NT12/66GDF-730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-NT12R/48BGDF-440 use vs GCL GCL-NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-440 uses TOPCon cells; GCL GCL-NT12/66GDF-730 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-NT12R/48BGDF-440 and GCL GCL-NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-440 has a 30 years power warranty; GCL GCL-NT12/66GDF-730 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-NT12R/48BGDF-440 and GCL GCL-NT12/66GDF-730 bifacial panels?
Both GCL GCL-NT12R/48BGDF-440 and GCL GCL-NT12/66GDF-730 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.