Strong in heat, heavy for its output
The Horay Solar HS 191R-120 TC-D Basin series sets new standards in the high-efficiency module segment, focusing on advanced N-type TOPCon technology. Thanks to the use of rectangular R-type cells, these panels offer significantly higher energy density than traditional solutions, resulting in better utilization of the available roof or ground space. A key innovation is the bifacial double glass design, which allows for the generation of additional energy from both sides of the module, maximizing gains especially on bright surfaces. This solution effectively eliminates the problem of rapid light-induced degradation, guaranteeing stable operation for decades. Basin series panels are characterized by an excellent temperature coefficient, which makes them work efficiently even on hot days when standard cells lose power. This product is dedicated to investors seeking uncompromising durability and the highest yields per square meter of installation. A standout feature among the competition is the unique combination of aesthetics with increased mechanical resistance to extreme weather phenomena. By choosing this series, the user receives technology that realistically shortens the return on investment time thanks to higher efficiency in low-light conditions, such as dawn or dusk.
Ranking
Signals from the data
Commercial and hot-climate.
Weight-limited structures.
Top 10% of the TOPCon 500-550 W segment, against a median of -0.290. Ranked 1,347th in the whole database.
Bottom 20% of the TOPCon 500-550 W segment, against a median of 52.4.
N-type TOPCon cells deliver an annual degradation rate of ~0.40% (vs. ~0.50% for PERC) and effectively eliminate LID. The rectangular R-format 191mm cell boosts energy density beyond standard 182mm configurations, enabling a 500-520 Wp power range across only 120 half-cut cells.
The glass-glass build with an 80-85% bifaciality factor contributes 5-30% additional energy yield from the rear side depending on ground albedo. Eliminating the UV-susceptible backsheet directly supports a 30-year design life and reduces the long-term LCOE of the installation.
The manufacturer commits to a maximum annual degradation of 0.40%, guaranteeing ≥87.4% of nominal power after 30 years of operation. This is one of the longest performance warranty standards available for double-glass modules, surpassing the 25-year norm offered by many competitors.
Horay Solar has been listed on the BloombergNEF Tier-1 solar module manufacturers list since Q1 2025 and retained the status in Q1 2026. This facilitates project financing and insurance for C&I and utility-scale deployments where manufacturer bankability is a lender requirement.
The 22.1-23% efficiency range positions the Basin series among premium 120-cell modules; peer DAH Solar DHN-60R20/DG reaches the same 23% ceiling, confirming technical competitiveness within this product class.
Horay Solar provides a 15-year product (materials and workmanship) warranty, whereas direct competitor HT-SAAE (HT54-18X(N) series) offers 25 years as standard. This gap is material for TCO calculations in industrial installations and externally financed projects, where lenders often require a minimum 20-year product warranty.
The maximum module efficiency of 23.0% is 0.8 pp below HT-SAAE HT54-18X(N) (23.8%) and 0.5 pp below TCL Zhonghuan HSM-BD60-LA (23.5%). On space-constrained rooftops of, say, 50 m², this translates to measurably lower energy yield per square meter compared with the best alternatives in the same price segment.
- At 22.8% efficiency, this panel is on par with typical TOPCon 500-550W modules
- Power density of 227.8 W/m² matches the TOPCon 500-550W median
- At -0.28%/°C, hot weather performance is typical for TOPCon 500-550W panels
- At 28.0 kg, weight matches the TOPCon 500-550W median
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
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 515 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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About the HS 191R-120 TC-D Basin series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.