GCL GCL-NT12R/48GDF vs GCL GCL-NT12/66GDF-740
VS
The verdict
9 differences, and they point both ways
The largest is rated power: 265 W more power. 10 of 19 comparable parameters are identical.
See all 9 differencesHow alike are they
10
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
9 of 19 parameters
What actually differs
Parameter
NT12R/48GDF
NT12/66GDF-740
Difference
Rated power
475 Wp
740 Wp
265 W more power
Weight
24.5 kg
38.2 kg
13.7 kg lighter
Open-circuit voltage
36.30 V
49.46 V
13.16 V apart
Short-circuit current
16.23 A
18.72 A
2.49 A apart
Module area
1.998 m²
3.106 m²
1.108 m² apart
Voltage at max power
30.75 V
41.60 V
10.85 V apart
Current at max power
15.45 A
17.79 A
2.34 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
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.
NT12R/48GDF
15,937 kWh
NT12/66GDF-740
24,828 kWh
Lifetime gap
8,891 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NT12R/48GDF
NT12/66GDF-740
Standard test conditions
25 °C
100.0% of rated power
475 W
740 W
Cool, bright day
40 °C
95.7% of rated power
454 W
708 W
Typical summer roof
55 °C
91.3% of rated power
434 W
676 W
Hot roof
70 °C
87.0% of rated power
413 W
643 W
03
Full specification
Parameter
NT12R/48GDF
NT12/66GDF-740
Difference
Power and efficiency
Rated power
475 Wp
740 Wp
+265 W for NT12/66GDF-740
Module efficiency
23.77 %
23.82 %
Effectively the same
Power density
237.7 Wp/m²
238.2 Wp/m²
Effectively the same
Open-circuit voltage
36.30 V
49.46 V
13.16 V apart
Voltage at max power
30.75 V
41.60 V
10.85 V apart
Short-circuit current
16.23 A
18.72 A
2.49 A apart
Current at max power
15.45 A
17.79 A
2.34 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
24.5 kg
38.2 kg
-13.7 kg for NT12R/48GDF
Weight per kWp
51.6 kg/kWp
51.6 kg/kWp
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
96
132
36 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#499
vs
#418
NT12/66GDF-740 leads by 81 places
Power density
#467
vs
#431
NT12/66GDF-740 leads by 36 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#4,954
vs
#4,997
NT12R/48GDF leads by 43 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6,608
vs
#181
NT12/66GDF-740 leads by 6,427 places
05
Open the full database
More useful comparisons
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL GCL-NT12R/54GDF-530
7 differences, the largest is rated power
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL NT12R/54GDF-525W
7 differences, the largest is rated power
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL GCL-NT12R/54GDF-525
7 differences, the largest is rated power
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL NT12R/54BGDF-520W
11 differences, the largest is rated power
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL NT12R/54GDF-520W
9 differences, the largest is rated power
Same series, other bin
GCL GCL-NT12R/48GDF vs GCL GCL-NT12R/54GDF-520
9 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: GCL GCL-NT12R/48GDF or GCL GCL-NT12/66GDF-740?
According to our database: GCL GCL-NT12/66GDF-740 has higher module efficiency (23.82% vs 23.77%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12R/48GDF and GCL GCL-NT12/66GDF-740?
GCL GCL-NT12R/48GDF has a module efficiency of 23.77%, 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 GCL-NT12R/48GDF use vs GCL GCL-NT12/66GDF-740?
GCL GCL-NT12R/48GDF 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 GCL-NT12R/48GDF and GCL GCL-NT12/66GDF-740?
GCL GCL-NT12R/48GDF 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 GCL-NT12R/48GDF and GCL GCL-NT12/66GDF-740 bifacial panels?
Both GCL GCL-NT12R/48GDF 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.