Middle of its segment, weak in heat
The GSD8K66T series comprises bifacial N-Type photovoltaic modules built on TOPCon technology, combining half-cut monocrystalline cells with a dual tempered glass construction. Thanks to SMBB (multi-busbar) technology, the panels achieve better light trapping and more efficient current collection, delivering higher efficiency and more stable performance than conventional designs. The bifacial design also captures light reflected from the ground, boosting rear-side energy yield by up to several tens of percent, making this series particularly attractive for ground-mounted installations and sites with highly reflective surfaces. The dual-glass construction and anodized aluminum frame provide strong resistance to moisture, wind, and dust, allowing the modules to perform reliably in harsh climates and demanding industrial environments. An optimized manufacturing process ensures excellent resistance to PID degradation and LID/LETID effects, translating into a longer service life and lower annual power loss over the module's operating lifetime. The GSD8K66T series is designed for commercial and industrial investors seeking a low LCOE across the full lifetime of their solar installation.
Ranking
Signals from the data
Utility-scale, commercial and shaded-installations.
Hot climates.
Bottom 22% of the TOPCon 700-750 W segment, against a median of -0.290.
Efficiency up to 23.34% matches or exceeds top comparable series (Trina Solar Vertex N i-TOPCon and TCL Zhonghuan G12-66P – both 23.3%), placing the GSD8K66T among the leading N-type modules currently on the market.
The combination of half-cut monocrystalline TOPCon cells with multi-busbar (SMBB) technology improves light capture and reduces resistive losses versus older PERC designs, resulting in higher and more stable energy yield.
The bifacial design with tempered dual glass captures ground-reflected radiation, boosting rear-side energy yield by roughly 10–25%, which is particularly valuable for ground-mount installations on bright, reflective surfaces.
The manufacturer offers a 30-year linear power warranty alongside a 15-year product warranty, matching the premium standard among N-type TOPCon modules and the terms offered by leading players in the segment.
The 700–725 Wp power range matches the highest values achieved by comparable series from TCL Zhonghuan G12-66P and Trina Vertex N, reducing the number of modules needed per MWp and lowering BoS costs in large-scale installations.
G-STAR does not appear on Bloomberg NEF's Tier-1 bankable manufacturer list, unlike the comparable series from Trina Solar and TCL Zhonghuan, both recognized Tier-1 suppliers. This may complicate securing bank financing for large commercial and industrial projects.
- At 23.2% efficiency, this panel is on par with typical TOPCon 700-750W modules
- Power density of 231.8 W/m² matches the TOPCon 700-750W median
- At -0.30%/°C, hot weather performance is typical for TOPCon 700-750W panels
- Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
- In the top 10% 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 720 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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