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NT12R/54BGDF-520W vs GCL-NT12R/48GDF 8 of 19 identical Swap Change panels

GCL NT12R/54BGDF-520W vs GCL GCL-NT12R/48GDF

NT12R/54BGDF-520W
520 Wp 23.37 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
GCL-NT12R/48GDF
475 Wp 23.77 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

11 differences, and they point both ways

The largest is rated power: 45 W more power. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter NT12R/54BGDF-520W GCL-NT12R/48GDF Difference
Rated power 520 Wp 475 Wp 45 W more power
Module efficiency 23.37 % 23.77 % 0.40 pp more efficient
Weight 27.3 kg 24.5 kg 2.8 kg lighter
Open-circuit voltage 41.48 V 36.30 V 5.18 V apart
Module area 2.225 m² 1.998 m² 0.227 m² apart
Power density 233.7 Wp/m² 237.7 Wp/m² 4.0 Wp/m² higher
Voltage at max power 35.02 V 30.75 V 4.27 V apart
Cell count 108 96 12 cells apart
Short-circuit current 15.53 A 16.23 A 0.70 A apart
Dimensions 1962x1134x30 mm 1762x1134x30 mm 1962x1134x30 mm vs 1762x1134x30 mm
Current at max power 14.85 A 15.45 A 0.60 A apart
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.
NT12R/54BGDF-520W
17,447 kWh
GCL-NT12R/48GDF
15,937 kWh
Lifetime gap
1,510 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario NT12R/54BGDF-520W GCL-NT12R/48GDF
Standard test conditions 25 °C 100.0% of rated power 520 W 475 W
Cool, bright day 40 °C 95.7% of rated power 497 W 454 W
Typical summer roof 55 °C 91.3% of rated power 475 W 434 W
Hot roof 70 °C 87.0% of rated power 452 W 413 W
03

Full specification

Parameter NT12R/54BGDF-520W GCL-NT12R/48GDF Difference
Power and efficiency
Rated power 520 Wp 475 Wp +45 W for NT12R/54BGDF-520W
Module efficiency 23.37 % 23.77 % +0.40 pp for GCL-NT12R/48GDF
Power density 233.7 Wp/m² 237.7 Wp/m² +4.0 Wp/m² for GCL-NT12R/48GDF
Open-circuit voltage 41.48 V 36.30 V 5.18 V apart
Voltage at max power 35.02 V 30.75 V 4.27 V apart
Short-circuit current 15.53 A 16.23 A 0.70 A apart
Current at max power 14.85 A 15.45 A 0.60 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1962x1134x30 mm 1762x1134x30 mm 1962x1134x30 mm vs 1762x1134x30 mm
Module area 2.225 m² 1.998 m² 0.227 m² apart
Weight 27.3 kg 24.5 kg -2.8 kg for GCL-NT12R/48GDF
Weight per kWp 52.5 kg/kWp 51.6 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 108 96 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#930 vs #499
GCL-NT12R/48GDF leads by 431 places
Power density
#919 vs #467
GCL-NT12R/48GDF leads by 452 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#6,043 vs #4,954
GCL-NT12R/48GDF leads by 1,089 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#5,503 vs #6,608
NT12R/54BGDF-520W leads by 1,105 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL GCL-NT12R/54GDF-530
5 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL NT12R/54GDF-525W
4 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL GCL-NT12R/54GDF-525
4 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL NT12R/54GDF-520W
3 differences, the largest is open-circuit voltage
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL GCL-NT12R/54GDF-520
3 differences, the largest is open-circuit voltage
Same series, other bin
GCL NT12R/54BGDF-520W vs GCL NT12R/54BGDF-515W
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: GCL NT12R/54BGDF-520W or GCL GCL-NT12R/48GDF?
According to our database: GCL GCL-NT12R/48GDF has higher module efficiency (23.77% vs 23.37%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL NT12R/54BGDF-520W and GCL GCL-NT12R/48GDF?
GCL NT12R/54BGDF-520 W has a module efficiency of 23.37%, while GCL GCL-NT12R/48GDF is 23.77%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL NT12R/54BGDF-520W use vs GCL GCL-NT12R/48GDF?
GCL NT12R/54BGDF-520 W uses TOPCon cells; GCL GCL-NT12R/48GDF 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 NT12R/54BGDF-520W and GCL GCL-NT12R/48GDF?
GCL NT12R/54BGDF-520 W has a 30 years power warranty; GCL GCL-NT12R/48GDF 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 NT12R/54BGDF-520W and GCL GCL-NT12R/48GDF bifacial panels?
Both GCL NT12R/54BGDF-520 W and GCL GCL-NT12R/48GDF 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.