Light for its output, no clear weak spot
The Horay Solar Basin HS 191R-120 TC series is an advanced solution based on innovative rectangular N-type cells that redefine module surface area efficiency. Through the implementation of TOPCon technology, these panels offer significantly higher performance in low-light conditions and minimal power degradation over time, leading to a faster return on investment. The construction of the Basin series is characterized by exceptional mechanical resistance, effectively eliminating the risk of micro-cracks under extreme weather loads. The use of bifacial technology enables additional energy yield from reflected radiation, making these modules an ideal choice for demanding ground-mounted installations and modern commercial systems. What distinguishes them from the competition is the precise optimization of cell dimensions, allowing for maximum power density while maintaining full compatibility with popular mounting systems. This is a solution dedicated to investors seeking maximum durability and energy stability over the long-term. This series effectively addresses the challenge of limited space, providing more energy from every square meter thanks to its unique internal structure. It is an optimal choice that combines modern design with uncompromising energy yield parameters.
Ranking
Signals from the data
Weight-limited structures and hot roofs and southern climates.
Top 21% of the N-type 500-550 W segment, against a median of 50.0.
Top 23% of the N-type 500-550 W segment, against a median of -0.290.
N-type cells exhibit a lower annual degradation rate (~0.40%/yr) compared to PERC (~0.55%/yr), delivering ~4-5% more cumulative energy output over a 30-year system life. The lower Pmax temperature coefficient (typically -0.30%/°C vs. -0.34%/°C for PERC) also improves yield on hot summer days.
The rectangular 191 mm G12R wafer format enables denser cell packing on the module face compared to the standard 182 mm square format, achieving up to 520 Wp with only 120 half-cut cells. The higher power density translates to fewer modules required per unit of roof or ground area.
Horay Solar backs the Basin series with a 30-year linear power warranty, in line with current premium TOPCon segment standards. Combined with the inherently low N-type degradation rate, this simplifies DCF modeling for commercial investors and satisfies lender requirements for project-finance structures.
Horay Solar joined the BloombergNEF Tier-1 bankable manufacturer list in Q1 2025 and maintained that status through Q1 2026. Tier-1 designation lowers risk premiums in project-finance transactions and satisfies institutional lender due-diligence requirements for commercial and utility-scale PV installations.
The current premium N-type TOPCon segment standard is 15 years of product (workmanship) warranty - e.g., HT-SAAE HT54-18X(N): 15 yr, LONGi Hi-MO X6: 15 yr. The 12-year term offered for the Basin series is 20% shorter, which may be a constraint for project-finance debt tenors exceeding 10-12 years.
The series peaks at 23.0% module efficiency, while direct competitors in the same 500-520 Wp power band achieve: HT-SAAE HT54-18X(N) - 23.8%, TCL Zhonghuan Back Contact - 23.5%. The 0.8-1.7 percentage-point gap translates to less peak power per unit area, which matters most in space-constrained rooftop or ground installations.
The Basin series is monofacial (is_bifacial: false), unlike the DAH Solar DHN-60R20/DG (Double Glass bifacial) competing in the same 520 Wp power class. On ground-mount systems with reflective surfaces (albedo >20%), a bifacial module can harvest 5-15% additional energy from reflected irradiance, making this series less optimal for utility-scale projects where LCOE optimization is critical.
- Efficiency of 22.6% matches the N-type 500-550W median
- Power density of 225.5 W/m² matches the N-type 500-550W median
- At -0.28%/°C, hot weather performance is typical for N-type 500-550W panels
- 23.5 kg weight - 2.7 kg lighter than N-type 500-550W median (26.2 kg), reducing installation effort
- In the top 26% for efficiency among all N-type panels
Specifications
Datasheet charts
Measured curves published by Horay Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 510 Wp appear here. The rest cover the whole series.
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Alternatives
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About the Basin HS 191R-120 TC series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.