--- title: "GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-505W - Solar Panel Comparison | ComparePV" description: "Compare GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-505W 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-nt12r-48bgdf-445/gcl-nt12r-54bgdf-505w" updated: 2026-09-11 --- # GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-505W NT12R/54BGDF-505W leads on the differences that matter The largest is rated power: 60 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [GCL GCL-NT12R/48BGDF-445](https://comparepv.com/panel/gcl-gcl-nt12r-48bgdf-445) | [GCL NT12R/54BGDF-505W](https://comparepv.com/panel/gcl-nt12r-54bgdf-505w) | | Manufacturer | GCL | GCL | | Power | 445 Wp | 505 Wp | | Efficiency | 22.27 % | 22.70 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | GCL-NT12R/48BGDF-445 | NT12R/54BGDF-505W | Difference | | --- | --- | --- | --- | | Rated power | 445 Wp | 505 Wp | +60 W for NT12R/54BGDF-505W | | Weight | 21.5 kg | 27.3 kg | -5.8 kg for GCL-NT12R/48BGDF-445 | | Module efficiency | 22.27 % | 22.70 % | +0.43 pp for NT12R/54BGDF-505W | | Weight per kWp | 48.3 kg/kWp | 54.1 kg/kWp | -5.7 kg/kWp for GCL-NT12R/48BGDF-445 | | Open-circuit voltage | 35.68 V | 40.61 V | 4.93 V apart | | Module area | 1.998 m² | 2.225 m² | 0.227 m² apart | | Power density | 222.7 Wp/m² | 227.0 Wp/m² | +4.3 Wp/m² for NT12R/54BGDF-505W | | Voltage at max power | 30.15 V | 34.22 V | 4.07 V apart | | Cell count | 96 | 108 | 12 cells apart | | Dimensions | 1762x1134x30 mm | 1962x1134x30 mm | 1762x1134x30 mm vs 1962x1134x30 mm | ## Every compared parameter | Parameter | GCL-NT12R/48BGDF-445 | NT12R/54BGDF-505W | | --- | --- | --- | | Rated power | 445 Wp | 505 Wp | | Module efficiency | 22.27 % | 22.70 % | | Power density | 222.7 Wp/m² | 227.0 Wp/m² | | Open-circuit voltage | 35.68 V | 40.61 V | | Voltage at max power | 30.15 V | 34.22 V | | Short-circuit current | 15.50 A | 15.44 A | | Current at max power | 14.76 A | 14.76 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1762x1134x30 mm | 1962x1134x30 mm | | Module area | 1.998 m² | 2.225 m² | | Weight | 21.5 kg | 27.3 kg | | Weight per kWp | 48.3 kg/kWp | 54.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 96 | 108 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, 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. - **Cumulative output, GCL-NT12R/48BGDF-445:** 14,931 kWh - **Cumulative output, NT12R/54BGDF-505W:** 16,944 kWh - **Gap:** 2,013 kWh ## Output when hot | Condition | Cell temperature | GCL-NT12R/48BGDF-445 | NT12R/54BGDF-505W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 445 W | 505 W | 100.0% of rated power | | Cool, bright day | 40 °C | 426 W | 483 W | 95.7% of rated power | | Typical summer roof | 55 °C | 406 W | 461 W | 91.3% of rated power | | Hot roof | 70 °C | 387 W | 439 W | 87.0% of rated power | ## Against the whole database | Measure | GCL-NT12R/48BGDF-445 | NT12R/54BGDF-505W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,481 | #3,307 | 14,005 | NT12R/54BGDF-505W leads by 2,174 places | | Power density | #5,302 | #3,353 | 14,005 | NT12R/54BGDF-505W leads by 1,949 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #2,192 | #8,277 | 14,005 | GCL-NT12R/48BGDF-445 leads by 6,085 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #9,381 | #6,858 | 14,005 | NT12R/54BGDF-505W leads by 2,523 places | ## Questions ### Which panel is better: GCL GCL-NT12R/48BGDF-445 or GCL NT12R/54BGDF-505W? According to our database: **GCL NT12R/54BGDF-**505 W**** has higher module efficiency (**22.70%** vs **22.27%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of GCL GCL-NT12R/48BGDF-445 and GCL NT12R/54BGDF-505W? **GCL GCL-NT12R/48BGDF-445** has a module efficiency of **22.27%**, while **GCL NT12R/54BGDF-**505 W**** is **22.70%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does GCL GCL-NT12R/48BGDF-445 use vs GCL NT12R/54BGDF-505W? **GCL GCL-NT12R/48BGDF-445** uses **TOPCon** cells; **GCL NT12R/54BGDF-**505 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 GCL-NT12R/48BGDF-445 and GCL NT12R/54BGDF-505W? **GCL GCL-NT12R/48BGDF-445** has a **30 years** power warranty; **GCL NT12R/54BGDF-**505 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 GCL-NT12R/48BGDF-445 and GCL NT12R/54BGDF-505W bifacial panels? Both **GCL GCL-NT12R/48BGDF-445** and **GCL NT12R/54BGDF-**505 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. ## Related comparisons - [GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-520W](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-520w) - 10 differences, the largest is module efficiency - [GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-515W](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-515w) - 10 differences, the largest is module efficiency - [GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-510W](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-510w) - 10 differences, the largest is module efficiency - [GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-500W](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-500w) - 9 differences, the largest is rated power - [GCL GCL-NT12R/48BGDF-445 vs GCL NT12R/54BGDF-495W](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-495w) - 8 differences, the largest is rated power - [GCL GCL-NT12R/48BGDF-445 vs GCL GCL-NT12R/48GDF](https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-gcl-nt12r-48gdf) - 7 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/gcl-gcl-nt12r-48bgdf-445/gcl-nt12r-54bgdf-505w 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.