Middle of its segment, weak in heat
The G-STAR GSD8R66T series consists of solar modules engineered to capture every ray of sunlight by combining TOPCon cell technology with a dual-sided bifacial design. The use of half-cut cells arranged in a rectangular layout reduces resistive losses and minimizes the impact of partial shading, resulting in more stable energy output throughout the day. The dual glass construction provides high mechanical resistance and long-term durability, limiting performance degradation even under harsh conditions such as moisture, snow load, or intense sunlight. With support for a 1500V system voltage, these panels are well suited for both rooftop installations and large-scale solar farms, where optimizing BoS costs and lowering the LCOE of energy production matter most. The GSD8R66T series meets the needs of investors seeking a balance between high performance and long-term reliability, while offering an attractive alternative to costlier HJT solutions. It is a solid choice for installers and PV project developers who value proven technology, supply chain stability, and quality-assurance certifications.
Ranking
Signals from the data
Utility-scale, commercial and shaded-installations.
Hot climates.
Bottom 19% of the TOPCon 600-650 W segment, against a median of -0.290.
Maximum efficiency of 23.51% matches the top performers among peer comparables in the 635W class - Sunpro Power TOPCon 210R BIFACIAL (23.51%) and exceeds Longi Hi-MO X10 (23.5%) and Talesun TM7G78M (22.72%). This places the series at the leading edge of available TOPCon bifacial modules at comparable power ratings.
The 30-year power warranty exceeds the standard 25 years offered by many Tier-1 manufacturers, and combined with N-type TOPCon technology translates into a lower annual degradation rate and more stable energy yield over the long investment horizon.
The dual glass construction with bifacial cells enables additional energy capture from albedo reflected off the ground, particularly advantageous in ground-mount installations and bright rooftop surfaces, lowering the effective LCOE.
Support for 1500V system voltage allows longer strings and fewer BoS components (cabling, inverters, protection devices), reducing installation costs for both rooftop and utility-scale PV projects.
The use of half-cut cells reduces resistive losses and improves partial shading tolerance compared to conventional full-size cells, resulting in more stable output under variable irradiance conditions.
G-STAR does not appear on the BloombergNEF Tier-1 list, meaning no confirmed track record of supplying at least six projects above 10 MW financed by independent commercial banks. This can complicate bank financing for large-scale farm projects compared to series from Longi or Talesun.
Launched in 2023, the series has a relatively short field-operating history compared to established brands in the peer comparables set, raising questions about the manufacturer's capacity to honor the 30-year power warranty over such a long horizon.
- Efficiency of 22.9% matches the TOPCon 600-650W median
- At 229.5 W/m² power density, roof space requirements are typical for TOPCon 600-650W panels
- Temperature coefficient of -0.30%/°C matches the TOPCon 600-650W median
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
- Ranked #2268 out of 14005 panels for efficiency in the database
Specifications
Datasheet charts
Measured curves published by G-STAR in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 620 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
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