--- title: "GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-725 - Solar Panel Comparison | ComparePV" description: "Compare GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-725 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-nt12-66gdf-720/gcl-gcl-nt12-66gdf-725" updated: 2026-09-11 --- # GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-725 Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [GCL GCL-NT12/66GDF-720](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-720) | [GCL GCL-NT12/66GDF-725](https://comparepv.com/panel/gcl-gcl-nt12-66gdf-725) | | Manufacturer | GCL | GCL | | Power | 720 Wp | 725 Wp | | Efficiency | 23.18 % | 23.34 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | 720 | 725 | | --- | --- | --- | | Rated power | 720 Wp | 725 Wp | | Module efficiency | 23.18 % | 23.34 % | | Power density | 231.8 Wp/m² | 233.4 Wp/m² | | Open-circuit voltage | 48.58 V | 48.80 V | | Voltage at max power | 40.84 V | 41.03 V | | Short-circuit current | 18.55 A | 18.60 A | | Current at max power | 17.63 A | 17.67 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.2 kg | 38.2 kg | | Weight per kWp | 53.1 kg/kWp | 52.7 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 | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield 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. - **Cumulative output, 720:** 24,157 kWh - **Cumulative output, 725:** 24,325 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 720 | 725 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 725 W | 100.0% of rated power | | Cool, bright day | 40 °C | 689 W | 693 W | 95.7% of rated power | | Typical summer roof | 55 °C | 657 W | 662 W | 91.3% of rated power | | Hot roof | 70 °C | 626 W | 630 W | 87.0% of rated power | ## Against the whole database | Measure | 720 | 725 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,424 | #943 | 14,005 | 725 leads by 481 places | | Power density | #1,347 | #936 | 14,005 | 725 leads by 411 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #6,810 | #6,337 | 14,005 | 725 leads by 473 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #540 | #403 | 14,005 | 725 leads by 137 places | ## Questions ### Which panel is better: GCL GCL-NT12/66GDF-720 or GCL GCL-NT12/66GDF-725? According to our database: **GCL GCL-NT12/66GDF-725** has higher module efficiency (**23.34%** vs **23.18%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of GCL GCL-NT12/66GDF-720 and GCL GCL-NT12/66GDF-725? **GCL GCL-NT12/66GDF-720** has a module efficiency of **23.18%**, while **GCL GCL-NT12/66GDF-725** is **23.34%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does GCL GCL-NT12/66GDF-720 use vs GCL GCL-NT12/66GDF-725? **GCL GCL-NT12/66GDF-720** uses **TOPCon** cells; **GCL GCL-NT12/66GDF-725** 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-NT12/66GDF-720 and GCL GCL-NT12/66GDF-725? **GCL GCL-NT12/66GDF-720** has a **30 years** power warranty; **GCL GCL-NT12/66GDF-725** 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-720 and GCL GCL-NT12/66GDF-725 bifacial panels? Both **GCL GCL-NT12/66GDF-720** and **GCL GCL-NT12/66GDF-725** 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-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-740](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-gcl-nt12-66gdf-740) - 3 differences, the largest is module efficiency - [GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-735](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-gcl-nt12-66gdf-735) - 3 differences, the largest is module efficiency - [GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF-730](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-gcl-nt12-66gdf-730) - 3 differences, the largest is module efficiency - [GCL GCL-NT12/66GDF-720 vs GCL NT12/66GDF-730](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-nt12-66gdf-730) - 3 differences, the largest is module efficiency - [GCL GCL-NT12/66GDF-720 vs GCL NT12/66GDF-725](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-nt12-66gdf-725) - The same specification on paper - [GCL GCL-NT12/66GDF-720 vs GCL GCL-NT12/66GDF 725](https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-gcl-nt12-66gdf-725-1) - The same specification on paper --- Source: https://comparepv.com/compare/gcl-gcl-nt12-66gdf-720/gcl-gcl-nt12-66gdf-725 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.