GCL GCL-NT12/66GDF-715 vs GCL NT12/66GDF-725
VS
The verdict
NT12/66GDF-725 leads on the differences that matter
The largest is module efficiency: 0.32 pp more efficient. 16 of 19 comparable parameters are identical.
See all 3 differencesHow alike are they
16
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
3 of 19 parameters
What actually differs
Parameter
GCL-NT12/66GDF-715
NT12/66GDF-725
Difference
Module efficiency
23.02 %
23.34 %
0.32 pp more efficient
Power density
230.2 Wp/m²
233.4 Wp/m²
3.2 Wp/m² higher
Rated power
715 Wp
725 Wp
10 W more power
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-NT12/66GDF-715
23,990 kWh
NT12/66GDF-725
24,325 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
GCL-NT12/66GDF-715
NT12/66GDF-725
Standard test conditions
25 °C
100.0% of rated power
715 W
725 W
Cool, bright day
40 °C
95.7% of rated power
684 W
693 W
Typical summer roof
55 °C
91.3% of rated power
653 W
662 W
Hot roof
70 °C
87.0% of rated power
622 W
630 W
03
Full specification
Parameter
GCL-NT12/66GDF-715
NT12/66GDF-725
Difference
Power and efficiency
Rated power
715 Wp
725 Wp
+10 W for NT12/66GDF-725
Module efficiency
23.02 %
23.34 %
+0.32 pp for NT12/66GDF-725
Power density
230.2 Wp/m²
233.4 Wp/m²
+3.2 Wp/m² for NT12/66GDF-725
Open-circuit voltage
48.36 V
48.80 V
Effectively the same
Voltage at max power
40.65 V
41.03 V
Effectively the same
Short-circuit current
18.51 A
18.60 A
Effectively the same
Current at max power
17.59 A
17.67 A
Effectively the same
Temperature
Temperature coefficient
-0.290 %/°C
-0.290 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2384x1303x33 mm
Same
Module area
3.106 m²
3.106 m²
Same
Weight
38.2 kg
38.3 kg
Effectively the same
Weight per kWp
53.4 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
14,005 panels
Against the whole database
Efficiency
#1,797
vs
#943
NT12/66GDF-725 leads by 854 places
Power density
#2,018
vs
#936
NT12/66GDF-725 leads by 1,082 places
Heat behaviour
#2,165
vs
#2,165
Tied - the same position in the database
Weight
#7,356
vs
#6,514
NT12/66GDF-725 leads by 842 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#678
vs
#403
NT12/66GDF-725 leads by 275 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-NT12/66GDF-715 or GCL NT12/66GDF-725?
According to our database: GCL NT12/66GDF-725 has higher module efficiency (23.34% vs 23.02%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL GCL-NT12/66GDF-715 and GCL NT12/66GDF-725?
GCL GCL-NT12/66GDF-715 has a module efficiency of 23.02%, 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-NT12/66GDF-715 use vs GCL NT12/66GDF-725?
GCL GCL-NT12/66GDF-715 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-NT12/66GDF-715 and GCL NT12/66GDF-725?
GCL GCL-NT12/66GDF-715 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-NT12/66GDF-715 and GCL NT12/66GDF-725 bifacial panels?
Both GCL GCL-NT12/66GDF-715 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 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.