GCL GCL-NT12/66GDF-730 vs GCL GCL-M10/72GDF-B-550
VS
The verdict
NT12/66GDF-730 leads on the differences that matter
The largest is module efficiency: 2.50 pp more efficient. 6 of 19 comparable parameters are identical.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
13 of 19 parameters
What actually differs
Parameter
NT12/66GDF-730
M10/72GDF-B-550
Difference
Module efficiency
23.50 %
21.00 %
2.50 pp more efficient
Temperature coefficient
-0.290 %/°C
-0.350 %/°C
0.060 %/°C better in heat
Rated power
730 Wp
550 Wp
180 W more power
Power density
235.0 Wp/m²
209.6 Wp/m²
25.4 Wp/m² higher
Weight
38.2 kg
33.2 kg
5.0 kg lighter
Weight per kWp
52.3 kg/kWp
60.4 kg/kWp
8.0 kg/kWp lighter
Short-circuit current
18.64 A
13.88 A
4.76 A apart
Module area
3.106 m²
2.624 m²
0.482 m² apart
Cell technology
TOPCon
PERC
TOPCon vs PERC
Current at max power
17.71 A
13.12 A
4.59 A apart
Cell count
132
144
12 cells apart
Annual degradation
0.40 %/yr
0.45 %/yr
0.05 %/yr slower
Dimensions
2384x1303x33 mm
2290x1146x30 mm
2384x1303x33 mm vs 2290x1146x30 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
NT12/66GDF-730
24,493 kWh
M10/72GDF-B-550
18,112 kWh
Lifetime gap
6,381 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
NT12/66GDF-730
M10/72GDF-B-550
Standard test conditions
25 °C
100.0% of rated power
730 W
550 W
Cool, bright day
40 °C
94.8% of rated power
698 W
521 W
Typical summer roof
55 °C
89.5% of rated power
666 W
492 W
Hot roof
70 °C
84.2% of rated power
635 W
463 W
03
Full specification
Parameter
NT12/66GDF-730
M10/72GDF-B-550
Difference
Power and efficiency
Rated power
730 Wp
550 Wp
+180 W for NT12/66GDF-730
Module efficiency
23.50 %
21.00 %
+2.50 pp for NT12/66GDF-730
Power density
235.0 Wp/m²
209.6 Wp/m²
+25.4 Wp/m² for NT12/66GDF-730
Open-circuit voltage
49.02 V
49.80 V
Effectively the same
Voltage at max power
41.22 V
41.93 V
Effectively the same
Short-circuit current
18.64 A
13.88 A
4.76 A apart
Current at max power
17.71 A
13.12 A
4.59 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.350 %/°C
+0.060 %/°C for NT12/66GDF-730
Mechanical
Dimensions
2384x1303x33 mm
2290x1146x30 mm
2384x1303x33 mm vs 2290x1146x30 mm
Module area
3.106 m²
2.624 m²
0.482 m² apart
Weight
38.2 kg
33.2 kg
-5.0 kg for M10/72GDF-B-550
Weight per kWp
52.3 kg/kWp
60.4 kg/kWp
-8.0 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
0.40 %/yr
0.45 %/yr
-0.05 %/yr for NT12/66GDF-730
Technology
Cell technology
TOPCon
PERC
TOPCon vs PERC
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
144
12 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#716
vs
#9,758
NT12/66GDF-730 leads by 9,042 places
Power density
#800
vs
#9,926
NT12/66GDF-730 leads by 9,126 places
Heat behaviour
#2,165
vs
#10,419
NT12/66GDF-730 leads by 8,254 places
Weight
#5,805
vs
#12,444
NT12/66GDF-730 leads by 6,639 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#312
vs
#7,387
NT12/66GDF-730 leads by 7,075 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: GCL GCL-NT12/66GDF-730 or GCL GCL-M10/72GDF-B-550?
According to our database: GCL GCL-NT12/66GDF-730 has higher module efficiency (23.50% vs 21.00%); 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-NT12/66GDF-730 and GCL GCL-M10/72GDF-B-550?
GCL GCL-NT12/66GDF-730 has a module efficiency of 23.50%, while GCL GCL-M10/72GDF-B-550 is 21.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-NT12/66GDF-730 use vs GCL GCL-M10/72GDF-B-550?
GCL GCL-NT12/66GDF-730 uses TOPCon cells; GCL GCL-M10/72GDF-B-550 uses PERC. 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-730 and GCL GCL-M10/72GDF-B-550?
GCL GCL-NT12/66GDF-730 has a 30 years power warranty; GCL GCL-M10/72GDF-B-550 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-730 and GCL GCL-M10/72GDF-B-550 bifacial panels?
Both GCL GCL-NT12/66GDF-730 and GCL GCL-M10/72GDF-B-550 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.