Solid all-round for its segment
The GCL GCL-NT10/78GDF series is designed for installations where the maximum energy yield from the same surface area is crucial - especially for large ground-mounted projects and PV farms. The use of N-type TOPCon monocrystalline cells translates to high efficiency in real-world conditions and more stable long-term performance, which is key when calculating LCOE.
These are bifacial modules, so they can utilize reflected light from the ground - in practice, this means additional yield where appropriate conditions are met (e.g., light pavement, good ventilation, optimal row spacing). The dual glass construction helps better withstand mechanical stresses and demanding operating environments, and the certification includes, among others, resistance to anti-PID, salt fog, ammonia, and dust and sand.
The NT10/78GDF series will be an excellent choice for investors, EPCs, and business consumers who want to reduce degradation risk and rely on predictable energy production over the long term.
Ranking
Signals from the data
Utility-scale, commercial and hot-climate.
The use of N-type TOPCon monocrystalline cells delivers efficiency in the 22.9-23.79% range, clearly above typical PERC modules (~21-22%) and comparable to Waaree's ARKA series (21.29%), translating into higher yield per unit of roof or ground area.
Bifacial glass-glass modules capture light reflected from the ground, providing additional energy yield under suitable installation conditions (light-colored surface, ventilation), while the dual-glass build improves mechanical durability and extends service life compared to glass-backsheet designs.
The 30-year power warranty is a premium standard in the TOPCon segment and enables more precise LCOE calculations for ground-mount and utility-scale PV projects, where predictable long-term energy production is critical.
GCL System Integration is recognized as a Tier 1 manufacturer by BloombergNEF (Q2 2026 rankings), meaning access to non-recourse financing and lower risk for investors and EPCs executing large ground-mount projects.
Resistance to PID, salt mist, ammonia, and sand/dust makes the series suitable for ground-mount installations in industrial, agricultural, and coastal environments, where standard modules may show accelerated degradation.
Maximum efficiency of 23.79% is lower than comparable 665 Wp Tier 1 models - Sunpro Power SPDG-BC132R12 (24.62%) and Talesun CIPRO-TM9C72M (24.6%) - meaning roughly 3-4% lower power output per module for the same roof area.
- 23.2% module efficiency - 0.9pp better than the TOPCon 650-700W median of 22.4%
- Power density of 232.5 W/m² packs 8.8 W/m² more into the same footprint vs TOPCon 650-700W median (223.7 W/m²)
- At -0.29%/°C, hot weather performance is typical for TOPCon 650-700W panels
- At 33.6 kg, weight matches the TOPCon 650-700W median
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
Specifications
Datasheet charts
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 650 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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About the GCL-NT10/78GDF series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.