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NT12/66GDF 725 vs NT12R/66GDF-625 11 of 18 identical Swap Change panels

GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12R/66GDF-625

GCL-NT12/66GDF 725
725 Wp 23.34 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
GCL-NT12R/66GDF-625
625 Wp 23.14 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

NT12/66GDF 725 leads on the differences that matter

The largest is rated power: 100 W more power. 11 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 7 differences
How alike are they
11 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

7 of 18 parameters
Parameter NT12/66GDF 725 NT12R/66GDF-625 Difference
Rated power 725 Wp 625 Wp 100 W more power
Weight 38.3 kg 32.5 kg 5.8 kg lighter
Short-circuit current 18.60 A 16.00 A 2.60 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Module efficiency 23.34 % 23.14 % 0.20 pp more efficient
Current at max power 17.67 A 15.20 A 2.47 A apart
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, 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.
NT12/66GDF 725
24,325 kWh
NT12R/66GDF-625
20,970 kWh
Lifetime gap
3,355 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NT12/66GDF 725 NT12R/66GDF-625
Standard test conditions 25 °C 100.0% of rated power 725 W 625 W
Cool, bright day 40 °C 95.7% of rated power 693 W 598 W
Typical summer roof 55 °C 91.3% of rated power 662 W 571 W
Hot roof 70 °C 87.0% of rated power 630 W 543 W
03

Full specification

Parameter NT12/66GDF 725 NT12R/66GDF-625 Difference
Power and efficiency
Rated power 725 Wp 625 Wp +100 W for NT12/66GDF 725
Module efficiency 23.34 % 23.14 % +0.20 pp for NT12/66GDF 725
Power density 233.4 Wp/m² 231.4 Wp/m² Effectively the same
Open-circuit voltage 48.80 V 48.55 V Effectively the same
Voltage at max power 41.03 V 41.12 V Effectively the same
Short-circuit current 18.60 A 16.00 A 2.60 A apart
Current at max power 17.67 A 15.20 A 2.47 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 38.3 kg 32.5 kg -5.8 kg for NT12R/66GDF-625
Weight per kWp 52.8 kg/kWp 52.0 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 Not published by GCL
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#981 vs #1,554
NT12/66GDF 725 leads by 573 places
Power density
#974 vs #1,558
NT12/66GDF 725 leads by 584 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#6,570 vs #5,449
NT12R/66GDF-625 leads by 1,121 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#410 vs #2,266
NT12/66GDF 725 leads by 1,856 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12/66GDF-740
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12/66GDF-735
3 differences, the largest is module efficiency
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12/66GDF-730
The same specification on paper
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL NT12/66GDF-730
The same specification on paper
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12/66GDF-725
The same specification on paper
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL NT12/66GDF-725
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: GCL GCL-NT12/66GDF 725 or GCL GCL-NT12R/66GDF-625?
According to our database: GCL 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-NT12/66GDF 725 and GCL GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF 725 has a module efficiency of 23.34%, while GCL GCL-NT12R/66GDF-625 is 23.14%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL GCL-NT12/66GDF 725 use vs GCL GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF 725 uses TOPCon cells; GCL GCL-NT12R/66GDF-625 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 725 and GCL GCL-NT12R/66GDF-625?
GCL GCL-NT12/66GDF 725 has a 30 years power warranty; GCL GCL-NT12R/66GDF-625 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 725 and GCL GCL-NT12R/66GDF-625 bifacial panels?
Both GCL GCL-NT12/66GDF 725 and GCL GCL-NT12R/66GDF-625 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.