M10/72GDF-B-540 vs NT12/66GDF-730 6 of 19 identical Swap Change panels

GCL GCL-M10/72GDF-B-540 vs GCL GCL-NT12/66GDF-730

Q: Which panel is better: GCL GCL-M10/72GDF-B-540 or GCL GCL-NT12/66GDF-730?

According to our database: GCL GCL-NT12/66GDF-730 has higher module efficiency (23.50% vs 20.60%); GCL GCL-NT12/66GDF-730 tolerates heat better (temp coeff -0.290%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 has a module efficiency of 20.60%, while GCL GCL-NT12/66GDF-730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does GCL GCL-M10/72GDF-B-540 use vs GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 uses PERC cells; GCL GCL-NT12/66GDF-730 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 has a 30 years power warranty; GCL GCL-NT12/66GDF-730 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.

Q: Are GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730 bifacial panels?

Both GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730 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.

GCL-M10/72GDF-B-540

540 Wp 20.60 % PERC Bifacial

Open panel page Datasheet PDF

GCL-NT12/66GDF-730

730 Wp 23.50 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

NT12/66GDF-730 leads on the differences that matter

The largest is module efficiency: 2.90 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences

How alike are they

6 of 19 comparable
parameters are identical

identical differs

What actually differs

13 of 19 parameters

Parameter M10/72GDF-B-540 NT12/66GDF-730 Difference

Module efficiency 20.60 % 23.50 % 2.90 pp more efficient

Temperature coefficient -0.350 %/°C -0.290 %/°C 0.060 %/°C better in heat

Rated power 540 Wp 730 Wp 190 W more power

Power density 205.8 Wp/m² 235.0 Wp/m² 29.2 Wp/m² higher

Weight 33.2 kg 38.2 kg 5.0 kg lighter

Weight per kWp 61.5 kg/kWp 52.3 kg/kWp 9.2 kg/kWp lighter

Short-circuit current 13.78 A 18.64 A 4.86 A apart

Module area 2.624 m² 3.106 m² 0.482 m² apart

Cell technology PERC TOPCon PERC vs TOPCon

Current at max power 13.03 A 17.71 A 4.68 A apart

Cell count 144 132 12 cells apart

Annual degradation 0.45 %/yr 0.40 %/yr 0.05 %/yr slower

Dimensions 2290x1146x30 mm 2384x1303x33 mm 2290x1146x30 mm vs 2384x1303x33 mm

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

M10/72GDF-B-540

17,783 kWh

NT12/66GDF-730

24,493 kWh

Lifetime gap

6,710 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario M10/72GDF-B-540 NT12/66GDF-730

Standard test conditions 25 °C 100.0% of rated power 540 W 730 W

Cool, bright day 40 °C 94.8% of rated power 512 W 698 W

Typical summer roof 55 °C 89.5% of rated power 483 W 666 W

Hot roof 70 °C 84.2% of rated power 455 W 635 W

Full specification

Parameter M10/72GDF-B-540 NT12/66GDF-730 Difference

Power and efficiency

Rated power 540 Wp 730 Wp +190 W for NT12/66GDF-730

Module efficiency 20.60 % 23.50 % +2.90 pp for NT12/66GDF-730

Power density 205.8 Wp/m² 235.0 Wp/m² +29.2 Wp/m² for NT12/66GDF-730

Open-circuit voltage 49.24 V 49.02 V Effectively the same

Voltage at max power 41.45 V 41.22 V Effectively the same

Short-circuit current 13.78 A 18.64 A 4.86 A apart

Current at max power 13.03 A 17.71 A 4.68 A apart

Temperature

Temperature coefficient -0.350 %/°C -0.290 %/°C +0.060 %/°C for NT12/66GDF-730

Mechanical

Dimensions 2290x1146x30 mm 2384x1303x33 mm 2290x1146x30 mm vs 2384x1303x33 mm

Module area 2.624 m² 3.106 m² 0.482 m² apart

Weight 33.2 kg 38.2 kg -5.0 kg for M10/72GDF-B-540

Weight per kWp 61.5 kg/kWp 52.3 kg/kWp -9.2 kg/kWp for NT12/66GDF-730

Warranty and degradation

Product warranty 12 yrs 12 yrs Same

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.45 %/yr 0.40 %/yr -0.05 %/yr for NT12/66GDF-730

Technology

Cell technology PERC TOPCon PERC vs TOPCon

Cell type Monocrystalline Monocrystalline Same

Cell count 144 132 12 cells apart

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#11,093 vs #716

NT12/66GDF-730 leads by 10,377 places

Power density

#11,142 vs #800

NT12/66GDF-730 leads by 10,342 places

Heat behaviour

#10,419 vs #2,165

NT12/66GDF-730 leads by 8,254 places

Weight

#12,653 vs #5,805

NT12/66GDF-730 leads by 6,848 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#8,312 vs #312

NT12/66GDF-730 leads by 8,000 places

More useful comparisons

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GCL GCL-M10/72GDF-B-540 vs GCL GCL-M10/72GDF-B-545

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The same specification on paper

Written summary

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Questions about this pairing

Which panel is better: GCL GCL-M10/72GDF-B-540 or GCL GCL-NT12/66GDF-730?

According to our database: GCL GCL-NT12/66GDF-730 has higher module efficiency (23.50% vs 20.60%); GCL GCL-NT12/66GDF-730 tolerates heat better (temp coeff -0.290%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 has a module efficiency of 20.60%, while GCL GCL-NT12/66GDF-730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does GCL GCL-M10/72GDF-B-540 use vs GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 uses PERC cells; GCL GCL-NT12/66GDF-730 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-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730?

GCL GCL-M10/72GDF-B-540 has a 30 years power warranty; GCL GCL-NT12/66GDF-730 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-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730 bifacial panels?

Both GCL GCL-M10/72GDF-B-540 and GCL GCL-NT12/66GDF-730 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.