GCL GCL-NT12R/66GDF-625 vs GCL NT12/66GDF-725
VS
The verdict
NT12/66GDF-725 leads on the differences that matter
The largest is rated power: 100 W more power. 12 of 19 comparable parameters are identical.
See all 7 differencesHow alike are they
12
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
7 of 19 parameters
What actually differs
Parameter
GCL-NT12R/66GDF-625
NT12/66GDF-725
Difference
Rated power
625 Wp
725 Wp
100 W more power
Weight
32.5 kg
38.3 kg
5.8 kg lighter
Short-circuit current
16.00 A
18.60 A
2.60 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Module efficiency
23.14 %
23.34 %
0.20 pp more efficient
Current at max power
15.20 A
17.67 A
2.47 A apart
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 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.
GCL-NT12R/66GDF-625
20,970 kWh
NT12/66GDF-725
24,325 kWh
Lifetime gap
3,355 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
GCL-NT12R/66GDF-625
NT12/66GDF-725
Standard test conditions
25 °C
100.0% of rated power
625 W
725 W
Cool, bright day
40 °C
95.7% of rated power
598 W
693 W
Typical summer roof
55 °C
91.3% of rated power
571 W
662 W
Hot roof
70 °C
87.0% of rated power
543 W
630 W
03
Full specification
Parameter
GCL-NT12R/66GDF-625
NT12/66GDF-725
Difference
Power and efficiency
Rated power
625 Wp
725 Wp
+100 W for NT12/66GDF-725
Module efficiency
23.14 %
23.34 %
+0.20 pp for NT12/66GDF-725
Power density
231.4 Wp/m²
233.4 Wp/m²
Effectively the same
Open-circuit voltage
48.55 V
48.80 V
Effectively the same
Voltage at max power
41.12 V
41.03 V
Effectively the same
Short-circuit current
16.00 A
18.60 A
2.60 A apart
Current at max power
15.20 A
17.67 A
2.47 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight
32.5 kg
38.3 kg
-5.8 kg for GCL-NT12R/66GDF-625
Weight per kWp
52.0 kg/kWp
52.8 kg/kWp
Effectively the 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
132
132
Same
Bifacial
Yes
Yes
Same
04
14,129 panels
Against the whole database
Efficiency
#1,554
vs
#981
NT12/66GDF-725 leads by 573 places
Power density
#1,558
vs
#974
NT12/66GDF-725 leads by 584 places
Heat behaviour
#2,220
vs
#2,220
Tied - the same position in the database
Weight
#5,449
vs
#6,570
GCL-NT12R/66GDF-625 leads by 1,121 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,266
vs
#410
NT12/66GDF-725 leads by 1,856 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/66GDF-625 or GCL NT12/66GDF-725?
According to our database: GCL NT12/66GDF-725 has higher module efficiency (23.34% vs 23.14%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12R/66GDF-625 and GCL NT12/66GDF-725?
GCL GCL-NT12R/66GDF-625 has a module efficiency of 23.14%, while GCL NT12/66GDF-725 is 23.34%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-NT12R/66GDF-625 use vs GCL NT12/66GDF-725?
GCL GCL-NT12R/66GDF-625 uses TOPCon cells; GCL NT12/66GDF-725 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/66GDF-625 and GCL NT12/66GDF-725?
GCL GCL-NT12R/66GDF-625 has a 30 years power warranty; GCL NT12/66GDF-725 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/66GDF-625 and GCL NT12/66GDF-725 bifacial panels?
Both GCL GCL-NT12R/66GDF-625 and GCL NT12/66GDF-725 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 3 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.