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GCL Brand review

GCL-NR10R/54BGDF

500 Wp TOPCon Bifacial
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,626 of 14,005
Compare panels Datasheet PDF
Power (Wp)
500
Weak · bottom 10%
Efficiency (%)
24.50
Strong · top 1%
Density (Wp/m²)
245.0
Strong · top 1%
Temp (%/°C)
-0.260
Strong · top 2%
Weight (kg)
24.6
Typical · median 27.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

432 panels in the segment TOPCon 500-550 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 1 caution
Best for

Residential and commercial.

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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 500 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.50 % Strong Segment median 22.73%
Vmpp · Impp 34.71 V · 14.41 A Operating point at max power
Voc · Isc 40.87 V · 15.26 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1800×1134×30 mm · 2.04 m² of roof
Weight 24.6 kg Typical Typical · median 27.0 kg
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.260 %/°C Strong top 2% of its segment
Coefficient Voc · Isc -0.220 · 0.050 %/°C
Product warranty 30 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 444 W guaranteed
Degradation 1.00 → 0.35 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by GCL in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 500 Wp appear here. The rest cover the whole series.

Linear Power Degradation (Power Warranty) Linear Power Degradation (Power Warranty) Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.260 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
GCL GCL-NR10R/54BGDF 500 W 24.50% -0.260 24.6 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +0.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Lighter, +0.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg -10 W, lighter
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Lighter

Found 197 panels of the same or similar size to this one, within ±10 mm. See them here Found 201 panels of the same or similar size to this one, within ±25 mm. See them here Found 1712 panels of the same or similar size to this one, within ±50 mm. See them here Found 4014 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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