--- title: "GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-740 - Solar Panel Comparison | ComparePV" description: "Compare GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-740 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-nt12-66gdf-740" updated: 2026-09-11 --- # GCL GCL-M10/72GDF-B-545 vs GCL GCL-NT12/66GDF-740 NT12/66GDF-740 leads on the differences that matter The largest is module efficiency: 3.02 pp more efficient. 6 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [GCL GCL-M10/72GDF-B-545](https://comparepv.com/panel/gcl-gcl-m10-72gdf-b-545) | [GCL GCL-NT12/66GDF-740](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-740) | | Manufacturer | GCL | GCL | | Power | 545 Wp | 740 Wp | | Efficiency | 20.80 % | 23.82 % | | Technology | PERC | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | M10/72GDF-B-545 | NT12/66GDF-740 | Difference | | --- | --- | --- | --- | | Module efficiency | 20.80 % | 23.82 % | +3.02 pp for NT12/66GDF-740 | | Temperature coefficient | -0.350 %/°C | -0.290 %/°C | +0.060 %/°C for NT12/66GDF-740 | | Rated power | 545 Wp | 740 Wp | +195 W for NT12/66GDF-740 | | Power density | 207.7 Wp/m² | 238.2 Wp/m² | +30.6 Wp/m² for NT12/66GDF-740 | | Weight | 33.2 kg | 38.2 kg | -5.0 kg for M10/72GDF-B-545 | | Weight per kWp | 60.9 kg/kWp | 51.6 kg/kWp | -9.3 kg/kWp for NT12/66GDF-740 | | Short-circuit current | 13.83 A | 18.72 A | 4.89 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 | 13.07 A | 17.79 A | 4.72 A apart | | Cell count | 144 | 132 | 12 cells apart | | Annual degradation | 0.45 %/yr | 0.40 %/yr | -0.05 %/yr for NT12/66GDF-740 | | Dimensions | 2290x1146x30 mm | 2384x1303x33 mm | 2290x1146x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | M10/72GDF-B-545 | NT12/66GDF-740 | | --- | --- | --- | | Rated power | 545 Wp | 740 Wp | | Module efficiency | 20.80 % | 23.82 % | | Power density | 207.7 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 49.52 V | 49.46 V | | Voltage at max power | 41.70 V | 41.60 V | | Short-circuit current | 13.83 A | 18.72 A | | Current at max power | 13.07 A | 17.79 A | | Temperature coefficient | -0.350 %/°C | -0.290 %/°C | | Dimensions | 2290x1146x30 mm | 2384x1303x33 mm | | Module area | 2.624 m² | 3.106 m² | | Weight | 33.2 kg | 38.2 kg | | Weight per kWp | 60.9 kg/kWp | 51.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.45 %/yr | 0.40 %/yr | | Cell technology | PERC | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, M10/72GDF-B-545:** 17,947 kWh - **Cumulative output, NT12/66GDF-740:** 24,828 kWh - **Gap:** 6,881 kWh ## Output when hot | Condition | Cell temperature | M10/72GDF-B-545 | NT12/66GDF-740 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 545 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 516 W | 708 W | 94.8% of rated power | | Typical summer roof | 55 °C | 488 W | 676 W | 89.5% of rated power | | Hot roof | 70 °C | 459 W | 643 W | 84.2% of rated power | ## Against the whole database | Measure | M10/72GDF-B-545 | NT12/66GDF-740 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #10,457 | #418 | 14,005 | NT12/66GDF-740 leads by 10,039 places | | Power density | #10,552 | #431 | 14,005 | NT12/66GDF-740 leads by 10,121 places | | Heat behaviour | #10,419 | #2,165 | 14,005 | NT12/66GDF-740 leads by 8,254 places | | Weight | #12,552 | #4,997 | 14,005 | NT12/66GDF-740 leads by 7,555 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #7,858 | #181 | 14,005 | NT12/66GDF-740 leads by 7,677 places | ## Questions ### Which panel is better: GCL GCL-M10/72GDF-B-545 or GCL GCL-NT12/66GDF-740? According to our database: **GCL GCL-NT12/66GDF-740** has higher module efficiency (**23.82%** vs **20.80%**); **GCL GCL-NT12/66GDF-740** 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-545 and GCL GCL-NT12/66GDF-740? **GCL GCL-M10/72GDF-B-545** has a module efficiency of **20.80%**, while **GCL GCL-NT12/66GDF-740** is **23.82%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does GCL GCL-M10/72GDF-B-545 use vs GCL GCL-NT12/66GDF-740? **GCL GCL-M10/72GDF-B-545** uses **PERC** cells; **GCL GCL-NT12/66GDF-740** 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-545 and GCL GCL-NT12/66GDF-740? **GCL GCL-M10/72GDF-B-545** has a **30 years** power warranty; **GCL GCL-NT12/66GDF-740** 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-545 and GCL GCL-NT12/66GDF-740 bifacial panels? Both **GCL GCL-M10/72GDF-B-545** and **GCL GCL-NT12/66GDF-740** 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. ## Related comparisons - [GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-555](https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-m10-72gdf-b-555) - 3 differences, the largest is module efficiency - [GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-550](https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-m10-72gdf-b-550) - One difference: module efficiency - [GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-540](https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-m10-72gdf-b-540) - One difference: module efficiency - [GCL GCL-M10/72GDF-B-545 vs GCL GCL-M10/72GDF-B-535](https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-m10-72gdf-b-535) - 3 differences, the largest is module efficiency - [GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF-735](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-740/gcl-gcl-nt12-66gdf-735) - The same specification on paper - [GCL GCL-NT12/66GDF-740 vs GCL GCL-NT12/66GDF-730](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-740/gcl-gcl-nt12-66gdf-730) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/gcl-gcl-m10-72gdf-b-545/gcl-gcl-nt12-66gdf-740 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.