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495W vs 520W 13 of 19 identical Swap Change panels

GCL NT12R/54BGDF-495W vs GCL NT12R/54BGDF-520W

NT12R/54BGDF-495W
495 Wp 22.25 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
NT12R/54BGDF-520W
520 Wp 23.37 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

520W leads on the differences that matter

The largest is module efficiency: 1.12 pp more efficient. 13 of 19 comparable parameters are identical.

See all 6 differences
How alike are they
13 of 19 comparable
parameters are identical
identical differs
01

What actually differs

6 of 19 parameters
Parameter 495W 520W Difference
Module efficiency 22.25 % 23.37 % 1.12 pp more efficient
Power density 222.5 Wp/m² 233.7 Wp/m² 11.2 Wp/m² higher
Rated power 495 Wp 520 Wp 25 W more power
Weight per kWp 55.2 kg/kWp 52.5 kg/kWp 2.7 kg/kWp lighter
Open-circuit voltage 40.03 V 41.48 V 1.45 V apart
Voltage at max power 33.63 V 35.02 V 1.39 V 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.
495W
16,608 kWh
520W
17,447 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 495W 520W
Standard test conditions 25 °C 100.0% of rated power 495 W 520 W
Cool, bright day 40 °C 95.7% of rated power 473 W 497 W
Typical summer roof 55 °C 91.3% of rated power 452 W 475 W
Hot roof 70 °C 87.0% of rated power 430 W 452 W
03

Full specification

Parameter 495W 520W Difference
Power and efficiency
Rated power 495 Wp 520 Wp +25 W for 520W
Module efficiency 22.25 % 23.37 % +1.12 pp for 520W
Power density 222.5 Wp/m² 233.7 Wp/m² +11.2 Wp/m² for 520W
Open-circuit voltage 40.03 V 41.48 V 1.45 V apart
Voltage at max power 33.63 V 35.02 V 1.39 V apart
Short-circuit current 15.40 A 15.53 A Effectively the same
Current at max power 14.72 A 14.85 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 1962x1134x30 mm 1962x1134x30 mm Same
Module area 2.225 m² 2.225 m² Same
Weight 27.3 kg 27.3 kg Same
Weight per kWp 55.2 kg/kWp 52.5 kg/kWp -2.7 kg/kWp for 520W
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 108 108 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#5,689 vs #930
520W leads by 4,759 places
Power density
#5,700 vs #919
520W leads by 4,781 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#9,577 vs #6,043
520W leads by 3,534 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#7,835 vs #5,503
520W leads by 2,332 places
05

More useful comparisons

Open the full database
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL GCL-NT12R/54GDF-530
6 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL NT12R/54GDF-525W
6 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL GCL-NT12R/54GDF-525
6 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL NT12R/54GDF-520W
6 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL GCL-NT12R/54GDF-520
6 differences, the largest is module efficiency
Same series, other bin
GCL NT12R/54BGDF-495W vs GCL NT12R/54BGDF-515W
6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: GCL NT12R/54BGDF-495W or GCL NT12R/54BGDF-520W?
According to our database: GCL NT12R/54BGDF-520 W has higher module efficiency (23.37% vs 22.25%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of GCL NT12R/54BGDF-495W and GCL NT12R/54BGDF-520W?
GCL NT12R/54BGDF-495 W has a module efficiency of 22.25%, while GCL NT12R/54BGDF-520 W is 23.37%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does GCL NT12R/54BGDF-495W use vs GCL NT12R/54BGDF-520W?
GCL NT12R/54BGDF-495 W uses TOPCon cells; GCL NT12R/54BGDF-520 W 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-495W and GCL NT12R/54BGDF-520W?
GCL NT12R/54BGDF-495 W has a 30 years power warranty; GCL NT12R/54BGDF-520 W 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-495W and GCL NT12R/54BGDF-520W bifacial panels?
Both GCL NT12R/54BGDF-495 W and GCL NT12R/54BGDF-520 W 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.

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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.