--- title: "GCL GCL-NR10R/54BGDF 500W Solar Panel - Specs & Review | ComparePV" description: "GCL GCL-NR10R/54BGDF 500W solar panel. Specs: 24.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/gcl-gcl-nr10r-54bgdf" updated: 2026-09-11 --- # GCL GCL-NR10R/54BGDF Efficiency leader, no clear weak spot 432 panels in the segment TOPCon 500-550 W ## Identity - **Manufacturer:** GCL - **Model:** GCL-NR10R/54BGDF - **Series:** SiRo B - **Rated power:** 500 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 500-550 W (432 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 500 W | 510 W | Weak - bottom 10% | | | Module efficiency | 24.50% | 22.73% | Strong - top 1% | 74 | | Power density | 245.0 | 227.4 | Strong - top 1% | 77 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 2% | 511 | | Weight (kg) | 24.6 kg | 27.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 24.50% | 22.73% | Strong - top 1% | 74 | | Power density | 245.0 | 227.4 | Strong - top 1% | 77 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 2% | 511 | | Weight per kWp | 49.2 | 52.4 | Typical | 2,797 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **24.50% module efficiency** - Top 1% of the TOPCon 500-550 W segment, against a median of 22.73%. Ranked 74th in the whole database. - **245.0 watts per square metre** - Top 1% of the TOPCon 500-550 W segment, against a median of 227.4. Ranked 77th in the whole database. - **-0.260 %/°C temperature coefficient** - Top 2% of the TOPCon 500-550 W segment, against a median of -0.290. Ranked 511th in the whole database. - **Best for:** Residential and commercial. ## Specification ### Electrical - **Rated power (Pmax):** 500 W - **Efficiency:** 24.50 % - **Voltage at Pmax (Vmp):** 34.71 V - **Current at Pmax (Imp):** 14.41 A - **Open-circuit voltage (Voc):** 40.87 V - **Short-circuit current (Isc):** 15.26 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 108 - **Bifacial:** yes ### Physical - **Length:** 1800 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.6 kg - **Area:** 2.04 m2 - **Power density:** 245.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 444 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 74 of 14005 | | Power density | 77 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 2797 of 14005 | | Warranty | 21 of 14005 | ## Pros - **24.5% efficiency among segment leaders** - Module efficiency of 24.5% matches the best peer comparable (Gokin GK-3-54HGF) and clearly exceeds Silfab SIL HM (21%) and Selfa SV120M.2.4 (22.6%) at the same 500 Wp power class, meaning less roof area is needed for the same installed capacity. - **N-type GPC cells with bifacial construction** - GPC cell technology (TOPCon-adjacent) combined with a dual-glass bifacial design allows the module to recover additional energy reflected from the ground on its rear side, delivering higher annual yield than conventional monofacial PERC panels. - **30-year product and linear power warranty** - GCL backs the SiRo B series with a 30-year product warranty and a matching linear power warranty - significantly longer than the industry-standard 25 years offered by most tier-1 manufacturers, improving investment payback predictability. - **Shading resistance and reduced microcracking** - The absence of front busbar grids together with a high-efficiency rear junction lowers hot-spot risk under partial shading and reduces susceptibility to microcracks, extending the component's real-world service life. - **Tier-1 manufacturer with 35 years of history** - GCL is a bankable Tier-1 manufacturer operating since 1990, which lowers project financing risk and increases confidence in long-term warranty servicing compared to smaller, less established brands such as Selfa or Gokin. ## Cons - **Only one power variant in the series** - The SiRo B series is offered exclusively in a 500 Wp variant (variant\_count = 1), while some competitors provide a broader power range within the same product line, limiting flexibility when matching modules to non-standard roof layouts. ## About this series The SiRo B series consists of fully black solar modules designed for installations where both performance and roof or facade aesthetics matter. The panels use N-type cells built with GPC (Graphical Precise-doping Contact) technology, similar to TOPCon, combined with a bifacial dual-glass construction that lets the module capture extra reflected light on its rear side. A highly efficient rear-contact cell design paired with the elimination of front busbars gives the series **shade tolerance** - the module keeps operating even when individual cells are partially shaded, significantly lowering the risk of hot spots. The **busbar-free front surface** further reduces the risk of microcracks and extends the component's service life. The fully black frame and rear glass give the panels a **sleek, uniform appearance** that blends well with modern sloped roofs and facades, hiding the technology within the design. The manufacturer backs the series with a **30-year product and linear power warranty**, paired with low annual power degradation, translating into predictable long-term return on investment. SiRo B is particularly well suited to residential prosumer installations and buildings where facade design matters as much as energy yield. ## Notable figures - Efficiency of 24.5% is 1.8pp above the \*\*TOPCon 500-550W\*\* median (22.7%) - At 244.9 W/m² power density, this panel generates 17.5 W/m² more per unit area than \*\*TOPCon 500-550W\*\* median (227.4 W/m²) - Temperature coefficient of -0.26%/°C vs median -0.29%/°C means ~1% less power loss at 65°C - Weight of 24.6 kg (2.4 kg below \*\*TOPCon 500-550W\*\* median of 27.0 kg) allows easier transport and roof mounting - #74 for efficiency, #511 for temperature performance out of 14005 panels ## Questions ### Are GCL SiRo B panels suitable for a pitched roof on a single-family home? Yes, the SiRo B series is designed for residential prosumer installations, including pitched roofs. The all-black frame and black backsheet give it a uniform, aesthetic look that suits modern roof designs, while power output up to 500 Wp reduces the number of modules needed to cover a household's energy demand. ### What is GPC cell technology in SiRo B panels and how does it differ from TOPCon? GPC (Graphical Precise-doping Contact) is an N-type cell technology similar to TOPCon, using precise contact doping to reduce recombination losses. This results in higher efficiency and lower power degradation over time compared to standard P-type cells, while keeping production costs comparable to standard TOPCon solutions. ### Is it worth paying extra for a bifacial SiRo B panel instead of a standard module? Yes, if the installation allows good light exposure on the rear side, such as on a flat roof, facade, or ground-mounted structure over a reflective surface. The dual-glass bifacial design of SiRo B captures additional energy reflected off the ground, meaningfully increasing annual energy yield without adding array size. ### How does SiRo B handle partial shading, for example from a chimney or antenna? Thanks to a high-efficiency rear connection and the elimination of front busbars, the SiRo B series resists partial shading of individual cells. Module output isn't interrupted, and the risk of hot spots is significantly reduced, which matters for roofs with chimneys, dormers, or antennas casting shadows. ### What warranty comes with GCL SiRo B panels and who is the manufacturer? GCL, a Tier 1 manufacturer, backs the SiRo B series with a 30-year product warranty and a 30-year linear power warranty. This translates into low annual power degradation and a predictable, long-term return on investment, a key consideration when choosing panels for a residential solar installation. ### Does the busbar-free front design of SiRo B improve panel durability? Yes, the busbar-free front design reduces the risk of cell microcracks, one of the main causes of gradual power loss in solar modules over time. Combined with the dual-glass bifacial construction, this results in longer component lifespan and lower failure risk over the system's operating life. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1785467668825724-b22cb7c7a1f8.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +0.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Lighter, +0.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | -10 W, lighter | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Lighter | --- Source: https://comparepv.com/panel/gcl-gcl-nr10r-54bgdf Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.