GCL GCL-NT12R/48BGDF-445 vs GCL NT12/66GDF-730
VS
The verdict
NT12/66GDF-730 leads on the differences that matter
The largest is module efficiency: 1.23 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
GCL-NT12R/48BGDF-445
NT12/66GDF-730
Difference
Module efficiency
22.27 %
23.50 %
1.23 pp more efficient
Rated power
445 Wp
730 Wp
285 W more power
Power density
222.7 Wp/m²
235.0 Wp/m²
12.3 Wp/m² higher
Weight
21.5 kg
38.3 kg
16.8 kg lighter
Open-circuit voltage
35.68 V
49.02 V
13.34 V apart
Short-circuit current
15.50 A
18.64 A
3.14 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Weight per kWp
48.3 kg/kWp
52.5 kg/kWp
4.2 kg/kWp lighter
Voltage at max power
30.15 V
41.22 V
11.07 V apart
Current at max power
14.76 A
17.71 A
2.95 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.
GCL-NT12R/48BGDF-445
14,931 kWh
NT12/66GDF-730
24,493 kWh
Lifetime gap
9,562 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
GCL-NT12R/48BGDF-445
NT12/66GDF-730
Standard test conditions
25 °C
100.0% of rated power
445 W
730 W
Cool, bright day
40 °C
95.7% of rated power
426 W
698 W
Typical summer roof
55 °C
91.3% of rated power
406 W
666 W
Hot roof
70 °C
87.0% of rated power
387 W
635 W
03
Full specification
Parameter
GCL-NT12R/48BGDF-445
NT12/66GDF-730
Difference
Power and efficiency
Rated power
445 Wp
730 Wp
+285 W for NT12/66GDF-730
Module efficiency
22.27 %
23.50 %
+1.23 pp for NT12/66GDF-730
Power density
222.7 Wp/m²
235.0 Wp/m²
+12.3 Wp/m² for NT12/66GDF-730
Open-circuit voltage
35.68 V
49.02 V
13.34 V apart
Voltage at max power
30.15 V
41.22 V
11.07 V apart
Short-circuit current
15.50 A
18.64 A
3.14 A apart
Current at max power
14.76 A
17.71 A
2.95 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
38.3 kg
-16.8 kg for GCL-NT12R/48BGDF-445
Weight per kWp
48.3 kg/kWp
52.5 kg/kWp
-4.2 kg/kWp for GCL-NT12R/48BGDF-445
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
#5,481
vs
#716
NT12/66GDF-730 leads by 4,765 places
Power density
#5,302
vs
#800
NT12/66GDF-730 leads by 4,502 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#2,192
vs
#5,993
GCL-NT12R/48BGDF-445 leads by 3,801 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#9,381
vs
#312
NT12/66GDF-730 leads by 9,069 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-445 or GCL NT12/66GDF-730?
According to our database: GCL NT12/66GDF-730 has higher module efficiency (23.50% vs 22.27%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12R/48BGDF-445 and GCL NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-445 has a module efficiency of 22.27%, while 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-445 use vs GCL NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-445 uses TOPCon cells; 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-445 and GCL NT12/66GDF-730?
GCL GCL-NT12R/48BGDF-445 has a 30 years power warranty; 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-445 and GCL NT12/66GDF-730 bifacial panels?
Both GCL GCL-NT12R/48BGDF-445 and 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.