Skip to main content
66GDF 725 vs 66GDF-725 18 of 18 identical Swap Change panels

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

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

Identical on every published parameter

All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.

How alike are they
18 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

0 of 18 parameters

Every comparable parameter agrees. The full specification is below.

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.
66GDF 725
24,325 kWh
66GDF-725
24,325 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66GDF 725 66GDF-725
Standard test conditions 25 °C 100.0% of rated power 725 W 725 W
Cool, bright day 40 °C 95.7% of rated power 693 W 693 W
Typical summer roof 55 °C 91.3% of rated power 662 W 662 W
Hot roof 70 °C 87.0% of rated power 630 W 630 W
03

Full specification

Parameter 66GDF 725 66GDF-725 Difference
Power and efficiency
Rated power 725 Wp 725 Wp Same
Module efficiency 23.34 % 23.34 % Same
Power density 233.4 Wp/m² 233.4 Wp/m² Same
Open-circuit voltage 48.80 V 48.80 V Same
Voltage at max power 41.03 V 41.03 V Same
Short-circuit current 18.60 A 18.60 A Same
Current at max power 17.67 A 17.67 A 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 38.3 kg 38.2 kg Effectively the same
Weight per kWp 52.8 kg/kWp 52.7 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

14,005 panels
Efficiency
#943 vs #943
Tied - the same position in the database
Power density
#936 vs #936
Tied - the same position in the database
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#6,514 vs #6,337
66GDF-725 leads by 177 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#403 vs #403
Tied - the same position in the database
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 NT12/66GDF-725
The same specification on paper
Same series, other bin
GCL GCL-NT12/66GDF 725 vs GCL GCL-NT12/66GDF-720
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-NT12/66GDF-725?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. 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-NT12/66GDF-725?
GCL GCL-NT12/66GDF 725 has a module efficiency of 23.34%, while GCL 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 725 use vs GCL GCL-NT12/66GDF-725?
GCL GCL-NT12/66GDF 725 uses TOPCon cells; GCL 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 725 and GCL GCL-NT12/66GDF-725?
GCL GCL-NT12/66GDF 725 has a 30 years power warranty; GCL 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 725 and GCL GCL-NT12/66GDF-725 bifacial panels?
Both GCL GCL-NT12/66GDF 725 and GCL 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.