Middle of its segment, heavy for its output
The G-STAR GSD7S72T solar panel series represents a breakthrough in performance thanks to the use of N-type TOPCon cell technology, which minimizes energy losses and ensures excellent efficiency even in challenging lighting conditions. The use of a modern bifacial double glass design allows for the active capture of radiation reflected from the ground, which significantly increases the total energy yield from the installation compared to traditional single-sided modules. This solution perfectly addresses the needs of commercial investors and solar farm owners looking to maximize return on investment while limiting power degradation over a long-term horizon. Thanks to the complete elimination of the LID effect and improved resistance to high operating temperatures, these modules operate much more stably than standard competitor solutions, offering a longer warranty period for linear performance. Solid construction and a reinforced glass-glass structure make the GSD7S72T series exceptionally resistant to extreme mechanical loads and adverse weather conditions. Choosing this specific series is an investment in energy security and durability, dedicated to demanding large-scale projects where the priority is every watt of power generated per square meter of surface while maintaining the lowest possible LCOE.
Ranking
Signals from the data
Commercial, utility-scale and shaded-installations.
Weight-limited structures, tight roof space and roofs where every square metre has to count.
Bottom 14% of the TOPCon 550-600 W segment, against a median of 53.8.
Bottom 19% of the TOPCon 550-600 W segment, against a median of 22.44%.
Bottom 20% of the TOPCon 550-600 W segment, against a median of 224.4.
The top-tier variant GSD7S72T-595 achieves 23.03% module efficiency, matching direct competitors Solarspace Lumina II and Ulica Solar TOPCon (both 23.03%) and significantly outpacing the Sunova TS-BW78 (21.3%). This translates to approximately 8% more energy yield from the same footprint compared to the aforementioned Sunova module.
The manufacturer guarantees a linear power warranty for 30 years with an annual degradation rate of ≤0.40%, retaining approximately 88% of nominal power output at year 30. Most Tier-1 modules (e.g., Jinko, Trina) offer 25-year warranties with end-of-life power retention of ~84.8%, making the GSD7S72T more attractive in long-term financial models and LCOE calculations.
N-type TOPCon technology completely eliminates Light-Induced Degradation (LID) inherent to P-type PERC cells. The temperature coefficient of –0.30%/°C means that at a module operating temperature of 65°C (typical summer conditions in Poland), power losses are approximately 7.5% versus ~9% for standard PERC cells (–0.35%/°C) — a tangible gain on hot days.
The bifacial dual glass configuration harvests 5–25% additional energy from reflected irradiance (albedo), particularly effective over light-colored or snow-covered surfaces. The glass-glass laminate also extends mechanical service life and provides high resistance to wind and snow loads — typical rated values exceed 5,400 Pa (dynamic) and 2,400 Pa (static).
Seven power variants within a single series simplify project optimization for a given module count and inverter specifications, eliminating wasted power headroom. The 30 Wp flexibility range is significant in EPC tenders and utility-scale array design, where precise string power directly influences the selection of string inverters.
G-STAR does not appear on the BloombergNEF bankable Tier-1 list (confirmed by context: tier_1_bankable: false and absence from BNEF Q1 2026 reports). In projects financed on a non-recourse basis by banks or infrastructure funds, sourcing modules from a Tier-1 manufacturer is standard practice — the lack of this status may block financing or increase required insurance coverage for projects exceeding 1 MWp.
- Efficiency of 21.9% is 0.6pp below the TOPCon 550-600W median (22.4%)
- At 218.7 W/m², this panel generates 5.7 W/m² less per unit area than TOPCon 550-600W median (224.4 W/m²)
- At -0.30%/°C, hot weather performance is typical for TOPCon 550-600W panels
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
- In the top 49% for efficiency among all TOPCon panels
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 565 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.
Alternatives
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