Strong in heat, heavy for its output
The Horay Solar HS 191R-144 TC-D Basin series is an advanced solution based on N-type TOPCon technology, which redefines performance standards in challenging lighting conditions. Thanks to the bifacial dual-glass design, these panels not only generate additional energy from both sides of the module but also demonstrate extreme resistance to degradation caused by atmospheric factors. This solution effectively eliminates the problem of rapid power decline over time, making the investment significantly more financially predictable over the course of several decades. These modules are characterized by an excellent temperature coefficient, allowing them to maintain high efficiency even on hot days when traditional cells lose effectiveness. They are primarily intended for investors building large-scale photovoltaic farms and demanding commercial installations where the lowest levelized cost of energy (LCOE) is key. What sets them apart from the competition is the unique 144 TC-D cell structure, which minimizes internal losses and optimizes current flow inside the module. By choosing the Basin series, the user receives maximum power density per square meter and a guarantee of longevity, which is crucial in an era of dynamically changing energy prices in Poland. The use of dual glass further increases the structural rigidity, protecting the cells from micro-cracks.
Ranking
Signals from the data
Utility-scale, commercial and hot-climate.
Weight-limited structures, tight roof space and roofs where every square metre has to count.
Top 7% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 1,347th in the whole database.
Bottom 5% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 10,536th in the whole database.
Bottom 12% of the TOPCon 600-650 W segment, against a median of 22.80%.
Bottom 13% of the TOPCon 600-650 W segment, against a median of 227.7.
N-type cells eliminate virtually all LID (Light-Induced Degradation), with TOPCon modules showing ~1.0% degradation in DH2000 testing vs ~1.9% for PERC. A temperature coefficient of approximately -0.30%/°C (vs -0.35-0.40%/°C for PERC) delivers measurably higher energy yield during summer heat - a critical performance parameter for utility-scale PV farms.
The bifacial dual-glass construction delivers a bifaciality factor of approximately 80-85%, translating into 5-15% additional annual energy yield (depending on ground albedo: gravel, concrete, or snow). Double heat-strengthened glass mitigates microcracks, PID degradation risk, and moisture ingress - extending module service life beyond 30 years.
The HS191R-144TC-D-Basin-620W variant reaches 23% module efficiency, matching direct competitors HT-SAAE HT66-18X(ND)-F (23%) and Weran Solar LR7-72HTH 595~620M (23%). For ground-mounted utility projects with land constraints, this translates to reduced BoS costs (cabling, racking, land lease) for the same nameplate capacity.
Horay Solar guarantees a linear power degradation schedule over 30 years, consistent with the premium N-type TOPCon industry standard (≥87.4% of nameplate power at year 30). This enables stable financial modeling of PV farm revenues through approximately 2056 without exceeding contractual degradation thresholds.
Horay Solar has held BNEF Tier-1 manufacturer status since Q1 2025, confirmed again in the Q1 2026 ranking. Tier-1 classification is a prerequisite for most project-finance lenders and EU fund structures backing utility-scale PV assets, eliminating manufacturer-risk flags during due diligence.
The Basin series carries a 15-year product warranty (covering physical defects and lamination), while direct N-type TOPCon 600+ Wp competitors - including Trina Solar Vertex N, JA Solar DeepBlue 4.0 Pro, and Canadian Solar TOPBiHiKu6 - offer a standard 25-year product warranty. For a PV farm with a 20-25-year loan amortization schedule, this gap introduces real risk of out-of-warranty replacement costs.
- At 22.2% efficiency, this panel is 0.6pp below the TOPCon 600-650W median of 22.8%
- 222.1 W/m² power density is 5.6 W/m² below TOPCon 600-650W median (227.7 W/m²) - requires larger installation area
- At -0.28%/°C, hot weather performance is typical for TOPCon 600-650W panels
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
- #5881 for efficiency, #1347 for temperature performance out of 14129 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 600 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-144 TC-D Basin series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.