GCL GCL-M10/72GDF-B-555 vs GCL GCL-NT12/66GDF-730
VS
The verdict
NT12/66GDF-730 leads on the differences that matter
The largest is module efficiency: 2.40 pp more efficient. 5 of 19 comparable parameters are identical.
See all 14 differencesHow alike are they
5
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
14 of 19 parameters
What actually differs
Parameter
M10/72GDF-B-555
NT12/66GDF-730
Difference
Module efficiency
21.10 %
23.50 %
2.40 pp more efficient
Temperature coefficient
-0.350 %/°C
-0.290 %/°C
0.060 %/°C better in heat
Rated power
555 Wp
730 Wp
175 W more power
Power density
211.5 Wp/m²
235.0 Wp/m²
23.5 Wp/m² higher
Weight
33.2 kg
38.2 kg
5.0 kg lighter
Weight per kWp
59.8 kg/kWp
52.3 kg/kWp
7.5 kg/kWp lighter
Short-circuit current
13.93 A
18.64 A
4.71 A apart
Module area
2.624 m²
3.106 m²
0.482 m² apart
Cell technology
PERC
TOPCon
PERC vs TOPCon
Current at max power
13.16 A
17.71 A
4.55 A apart
Cell count
144
132
12 cells apart
Annual degradation
0.45 %/yr
0.40 %/yr
0.05 %/yr slower
Open-circuit voltage
50.08 V
49.02 V
1.06 V apart
Dimensions
2290x1146x30 mm
2384x1303x33 mm
2290x1146x30 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
M10/72GDF-B-555
18,277 kWh
NT12/66GDF-730
24,493 kWh
Lifetime gap
6,216 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
M10/72GDF-B-555
NT12/66GDF-730
Standard test conditions
25 °C
100.0% of rated power
555 W
730 W
Cool, bright day
40 °C
94.8% of rated power
526 W
698 W
Typical summer roof
55 °C
89.5% of rated power
497 W
666 W
Hot roof
70 °C
84.2% of rated power
468 W
635 W
03
Full specification
Parameter
M10/72GDF-B-555
NT12/66GDF-730
Difference
Power and efficiency
Rated power
555 Wp
730 Wp
+175 W for NT12/66GDF-730
Module efficiency
21.10 %
23.50 %
+2.40 pp for NT12/66GDF-730
Power density
211.5 Wp/m²
235.0 Wp/m²
+23.5 Wp/m² for NT12/66GDF-730
Open-circuit voltage
50.08 V
49.02 V
1.06 V apart
Voltage at max power
42.18 V
41.22 V
Effectively the same
Short-circuit current
13.93 A
18.64 A
4.71 A apart
Current at max power
13.16 A
17.71 A
4.55 A apart
Temperature
Temperature coefficient
-0.350 %/°C
-0.290 %/°C
+0.060 %/°C for NT12/66GDF-730
Mechanical
Dimensions
2290x1146x30 mm
2384x1303x33 mm
2290x1146x30 mm vs 2384x1303x33 mm
Module area
2.624 m²
3.106 m²
0.482 m² apart
Weight
33.2 kg
38.2 kg
-5.0 kg for M10/72GDF-B-555
Weight per kWp
59.8 kg/kWp
52.3 kg/kWp
-7.5 kg/kWp for NT12/66GDF-730
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.45 %/yr
0.40 %/yr
-0.05 %/yr for NT12/66GDF-730
Technology
Cell technology
PERC
TOPCon
PERC vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#9,297
vs
#716
NT12/66GDF-730 leads by 8,581 places
Power density
#9,200
vs
#800
NT12/66GDF-730 leads by 8,400 places
Heat behaviour
#10,419
vs
#2,165
NT12/66GDF-730 leads by 8,254 places
Weight
#12,297
vs
#5,805
NT12/66GDF-730 leads by 6,492 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#7,100
vs
#312
NT12/66GDF-730 leads by 6,788 places
05
Open the full database
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GCL GCL-NT12/66GDF-730 vs GCL GCL-NT12/66GDF-740
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GCL GCL-NT12/66GDF-730 vs GCL GCL-NT12/66GDF-735
The same specification on paper
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: GCL GCL-M10/72GDF-B-555 or GCL GCL-NT12/66GDF-730?
According to our database: GCL GCL-NT12/66GDF-730 has higher module efficiency (23.50% vs 21.10%); GCL GCL-NT12/66GDF-730 tolerates heat better (temp coeff -0.290%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-M10/72GDF-B-555 and GCL GCL-NT12/66GDF-730?
GCL GCL-M10/72GDF-B-555 has a module efficiency of 21.10%, 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-M10/72GDF-B-555 use vs GCL GCL-NT12/66GDF-730?
GCL GCL-M10/72GDF-B-555 uses PERC 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-M10/72GDF-B-555 and GCL GCL-NT12/66GDF-730?
GCL GCL-M10/72GDF-B-555 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-M10/72GDF-B-555 and GCL GCL-NT12/66GDF-730 bifacial panels?
Both GCL GCL-M10/72GDF-B-555 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.
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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.