NT12/66GDF-735 vs M10/72GDF-B-540 6 of 19 identical Swap Change panels

GCL GCL-NT12/66GDF-735 vs GCL GCL-M10/72GDF-B-540

Q: Which panel is better: GCL GCL-NT12/66GDF-735 or GCL GCL-M10/72GDF-B-540?

According to our database: GCL GCL-NT12/66GDF-735 has higher module efficiency (23.66% vs 20.60%); GCL GCL-NT12/66GDF-735 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-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 has a module efficiency of 23.66%, while GCL GCL-M10/72GDF-B-540 is 20.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does GCL GCL-NT12/66GDF-735 use vs GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 uses TOPCon cells; GCL GCL-M10/72GDF-B-540 uses PERC. 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-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 has a 30 years power warranty; GCL GCL-M10/72GDF-B-540 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-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540 bifacial panels?

Both GCL GCL-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540 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-NT12/66GDF-735

735 Wp 23.66 % TOPCon Bifacial

Open panel page Datasheet PDF

GCL-M10/72GDF-B-540

540 Wp 20.60 % PERC Bifacial

Open panel page Datasheet PDF

The verdict

NT12/66GDF-735 leads on the differences that matter

The largest is module efficiency: 3.06 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 NT12/66GDF-735 M10/72GDF-B-540 Difference

Module efficiency 23.66 % 20.60 % 3.06 pp more efficient

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

Rated power 735 Wp 540 Wp 195 W more power

Power density 236.6 Wp/m² 205.8 Wp/m² 30.8 Wp/m² higher

Weight 38.2 kg 33.2 kg 5.0 kg lighter

Weight per kWp 52.0 kg/kWp 61.5 kg/kWp 9.5 kg/kWp lighter

Short-circuit current 18.68 A 13.78 A 4.90 A apart

Module area 3.106 m² 2.624 m² 0.482 m² apart

Cell technology TOPCon PERC TOPCon vs PERC

Current at max power 17.75 A 13.03 A 4.72 A apart

Cell count 132 144 12 cells apart

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

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

NT12/66GDF-735

24,661 kWh

M10/72GDF-B-540

17,783 kWh

Lifetime gap

6,878 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario NT12/66GDF-735 M10/72GDF-B-540

Standard test conditions 25 °C 100.0% of rated power 735 W 540 W

Cool, bright day 40 °C 94.8% of rated power 703 W 512 W

Typical summer roof 55 °C 89.5% of rated power 671 W 483 W

Hot roof 70 °C 84.2% of rated power 639 W 455 W

Full specification

Parameter NT12/66GDF-735 M10/72GDF-B-540 Difference

Power and efficiency

Rated power 735 Wp 540 Wp +195 W for NT12/66GDF-735

Module efficiency 23.66 % 20.60 % +3.06 pp for NT12/66GDF-735

Power density 236.6 Wp/m² 205.8 Wp/m² +30.8 Wp/m² for NT12/66GDF-735

Open-circuit voltage 49.24 V 49.24 V Same

Voltage at max power 41.41 V 41.45 V Effectively the same

Short-circuit current 18.68 A 13.78 A 4.90 A apart

Current at max power 17.75 A 13.03 A 4.72 A apart

Temperature

Temperature coefficient -0.290 %/°C -0.350 %/°C +0.060 %/°C for NT12/66GDF-735

Mechanical

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

Module area 3.106 m² 2.624 m² 0.482 m² apart

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

Weight per kWp 52.0 kg/kWp 61.5 kg/kWp -9.5 kg/kWp for NT12/66GDF-735

Warranty and degradation

Product warranty 12 yrs 12 yrs Same

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.40 %/yr 0.45 %/yr -0.05 %/yr for NT12/66GDF-735

Technology

Cell technology TOPCon PERC TOPCon vs PERC

Cell type Monocrystalline Monocrystalline Same

Cell count 132 144 12 cells apart

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#602 vs #11,093

NT12/66GDF-735 leads by 10,491 places

Power density

#582 vs #11,142

NT12/66GDF-735 leads by 10,560 places

Heat behaviour

#2,165 vs #10,419

NT12/66GDF-735 leads by 8,254 places

Weight

#5,413 vs #12,653

NT12/66GDF-735 leads by 7,240 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#244 vs #8,312

NT12/66GDF-735 leads by 8,068 places

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Written summary

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Questions about this pairing

Which panel is better: GCL GCL-NT12/66GDF-735 or GCL GCL-M10/72GDF-B-540?

According to our database: GCL GCL-NT12/66GDF-735 has higher module efficiency (23.66% vs 20.60%); GCL GCL-NT12/66GDF-735 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-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 has a module efficiency of 23.66%, while GCL GCL-M10/72GDF-B-540 is 20.60%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does GCL GCL-NT12/66GDF-735 use vs GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 uses TOPCon cells; GCL GCL-M10/72GDF-B-540 uses PERC. 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-735 and GCL GCL-M10/72GDF-B-540?

GCL GCL-NT12/66GDF-735 has a 30 years power warranty; GCL GCL-M10/72GDF-B-540 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-735 and GCL GCL-M10/72GDF-B-540 bifacial panels?

Both GCL GCL-NT12/66GDF-735 and GCL GCL-M10/72GDF-B-540 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.