--- title: "GCL GCL-NT12R/48BGDF-450 450W Solar Panel - Specs & Review | ComparePV" description: "GCL GCL-NT12R/48BGDF-450 450W solar panel. Specs: 22.52% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/gcl-gcl-nt12r-48bgdf-450" updated: 2026-09-11 --- # GCL GCL-NT12R/48BGDF-450 Solid all-round for its segment 1,089 panels in the segment TOPCon 450-500 W ## Identity - **Manufacturer:** GCL - **Model:** GCL-NT12R/48BGDF-450 - **Series:** NT12R/48BGDF - **Rated power:** 450 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 450-500 W (1089 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 450 W | 465 W | Weak - bottom 9% | | | Module efficiency | 22.52% | 22.52% | Typical | 4,108 | | Power density | 225.2 | 225.2 | Typical | 4,225 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 21.5 kg | 24.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.52% | 22.52% | Typical | 4,108 | | Power density | 225.2 | 225.2 | Typical | 4,225 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 47.8 | 52.2 | Typical | 1,891 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 450 W - **Efficiency:** 22.52 % - **Voltage at Pmax (Vmp):** 30.45 V - **Current at Pmax (Imp):** 14.78 A - **Open-circuit voltage (Voc):** 35.98 V - **Short-circuit current (Isc):** 15.52 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 96 - **Bifacial:** yes ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.5 kg - **Area:** 2.00 m2 - **Power density:** 225.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 393 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4108 of 14005 | | Power density | 4225 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 1891 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Low Degradation with N-type TOPCon Cells** - N-type TOPCon technology eliminates the Light-Induced Degradation (LID) effect inherent to P-type cells. For the NT12R series, declared first-year degradation is up to 2.5%, followed by ~0.4%/year — compared to the typical 0.55%/year for PERC modules — resulting in meaningfully higher cumulative energy yield over 20+ years of operation. - **Bifacial Glass-Glass Construction** - The dual-glass bifacial design delivers up to 15–20% additional energy yield from reflected irradiance when installed over high-albedo surfaces (white TPO membrane, gravel, concrete). The glass rear sheet, replacing a conventional backsheet, also enhances mechanical and chemical resistance, extending module service life beyond the rated 30 years. - **Favorable Temperature Coefficient** - The N-type GCL cells in this series carry a temperature coefficient of Pmax of approximately -0.29%/°C, versus -0.35%/°C for standard PERC modules. At typical Polish summer module operating temperatures of around 65°C, this translates to roughly 2.5% higher energy yield compared to an equivalent PERC module in the same system. - **BNEF Tier-1 Manufacturer — Ranked #2 Globally** - GCL System Integration (GCL-SI) holds BNEF Tier-1 (bankable manufacturer) status and has historically ranked 2nd worldwide by annual production capacity. Bankability streamlines project finance and leasing for commercial and industrial installations, eliminating the need for additional due diligence requirements. - **30-Year Linear Power Warranty** - The NT12R/48BGDF series carries a 30-year linear power output warranty (issued in 2024), exceeding the 25-year standard prevalent among PERC modules. For investors developing utility-scale PV plants, the extended warranty directly reduces LCOE and simplifies cash-flow modeling across the full project lifetime. ## Cons - **Efficiency Below Best-in-Class Peer Comparables** - The series reaches a maximum efficiency of 22.52%, while peer comparables such as the SunKean/Sunket SKT430~450M10-108D5 achieve 23.04% within the same 430–450 Wp power class. The 0.52 percentage-point gap translates to approximately 2.3% lower power density per m², which on constrained roof areas may necessitate the installation of 1–2 additional modules per 100 kWp of system capacity. - **12-Year Product Warranty** - The product warranty stands at 12 years, whereas leading competitors (Jinko, JA Solar, LONGi) in the premium TOPCon segment standardly offer 15 years. For EPC projects with O&M service agreements extending beyond 15 years, this shortfall may require a separate insurance policy or negotiation of supplementary warranty terms with the distributor. ## About this series GCL NT12R/48BGDF modules are an advanced solution based on **N-type TOPCon cell technology**, setting new standards for efficiency in modern commercial and industrial installations. The use of innovative, rectangular silicon wafers allows for maximum utilization of the available mounting area, which directly translates into significantly higher power generated per square meter. A key feature of this series is the **bifacial glass-glass design**, which provides not only additional energy yield from reflected radiation but also extreme resistance to harsh weather conditions and chemical degradation processes. These panels effectively eliminate the problem of efficiency loss in low-light conditions, offering stable and predictable operation even under heavy cloud cover. Thanks to **exceptionally low annual degradation**, investors gain a guarantee of long-term profits and a faster return on investment compared to standard P-type modules. The NT12R series is primarily dedicated to investors building solar farms and large-scale roofs, where **maximum power density** and component longevity are crucial. Compared to the competition, the product stands out with an excellent temperature coefficient, ensuring the system works with high efficiency during summer heatwaves and optimizing the **total cost of energy LCOE** for the entire project. ## Notable figures - Efficiency of 22.5% matches the \*\*TOPCon 450-500W\*\* median - Power density of 225.2 W/m² matches the \*\*TOPCon 450-500W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 450-500W\*\* median - 21.5 kg weight - 2.5 kg lighter than \*\*TOPCon 450-500W\*\* median (24.0 kg), reducing installation effort - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What warranty is provided for the GCL NT12R/48BGDF panels and what does it cover? The GCL NT12R/48BGDF series comes with a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. This means the panel maintains the manufacturer-specified performance level for three decades, making this series one of the most financially secure options among commercial-grade modules available on the European market. ### What is TOPCon technology and why should I choose it in the GCL NT12R/48BGDF panels over a cheaper PERC alternative? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology in which an additional silicon oxide layer minimizes electron recombination losses. In practice, this results in higher module efficiency and significantly lower annual degradation compared to conventional P-type PERC cells. The GCL NT12R/48BGDF panels degrade more slowly over 30 years of operation, which directly reduces the levelized cost of energy (LCOE). ### Do the bifacial glass-glass GCL NT12R/48BGDF panels actually generate more energy, and when does it make economic sense? Yes, the bifacial design allows the rear side of the panel to capture irradiance reflected from the ground surface. The real-world energy gain typically ranges from 5–15%, depending on the albedo of the surface beneath the panels — the best results are achieved with light-colored gravel, white roofing membranes, or snow-covered ground. The glass-glass encapsulation further extends service life and eliminates the risk of backsheet delamination. This configuration is particularly cost-effective in ground-mounted utility-scale systems and large flat-roof installations. ### What are the dimensions and weight of the GCL NT12R/48BGDF panel — is it suitable for a typical industrial rooftop? The module measures 1762 × 1134 × 30 mm and weighs approximately 24.5 kg. Its footprint and mass correspond to the standard 48-cell format, which simplifies installation on racking systems commonly used for industrial buildings and warehouses. Prior to installation, however, the load-bearing capacity of the roofing structure must be verified, especially in high-density array configurations over large surface areas. ### Do the GCL NT12R/48BGDF panels perform well in high temperatures or under low-irradiance conditions? N-type TOPCon cells feature a more favorable temperature coefficient than P-type cells, resulting in lower power output losses during summer heat. The NT12R/48BGDF series also performs well under diffuse light — overcast skies or early morning hours cause less efficiency loss than with PERC modules. This is a significant advantage in the Polish climate, where full irradiance conditions are not the norm. ### Is GCL a reliable manufacturer, and do the NT12R/48BGDF panels carry the certifications required for installations in Poland? GCL (GCL System Integration Technology) is a Chinese manufacturer ranked as Tier 1 by Bloomberg NEF, confirming its financial and production stability. The NT12R/48BGDF modules hold IEC 61215 and IEC 61730 certifications, which are required by Polish distributors and subsidy programs such as those administered by the NFOŚiGW. Sourcing from a Tier 1 manufacturer also provides a realistic basis for enforcing the warranty over a 30-year period. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/EN-NT12R48BGDF-J1-009d699713ec.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +45 W, cooler, +2.3 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +40 W, cooler, +2.0 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +50 W, cooler, +2.0 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +50 W, cooler, +2.0 pp | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | +50 W, cooler, +2.0 pp | | [GCL GCL-NR10R/54BGDF](https://comparepv.com/panel/gcl-gcl-nr10r-54bgdf) | 500 W | +50 W, heavier, +2.0 pp | | [GCL GCL-NT12R/48BGDF-430](https://comparepv.com/panel/gcl-gcl-nt12r-48bgdf-430) | 430 W | -20 W, -1.0 pp | | [GCL GCL-NT12R/48BGDF-435](https://comparepv.com/panel/gcl-gcl-nt12r-48bgdf-435) | 435 W | -15 W, -0.8 pp | | [GCL NT12R/48GDF-440W](https://comparepv.com/panel/gcl-nt12r-48gdf-440w) | 440 W | -10 W, heavier, -0.5 pp | | [GCL NT12R/48GDF-445W](https://comparepv.com/panel/gcl-nt12r-48gdf-445w) | 445 W | Heavier, -0.2 pp | | [GCL NT12R/48GDF-455W](https://comparepv.com/panel/gcl-nt12r-48gdf-455w) | 455 W | Heavier, +0.2 pp | | [GCL NT12R/48GDF-460W](https://comparepv.com/panel/gcl-nt12r-48gdf-460w) | 460 W | +10 W, heavier, +0.5 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +60 W, cooler, +2.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +55 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/gcl-gcl-nt12r-48bgdf-450 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.