Strong in heat, heavy for its output
Horay Solar HS 191R-108 TC-D Basin photovoltaic panels utilize advanced N-type TOPCon cell technology, which directly translates to significantly higher efficiency and better performance on cloudy days. By using rectangular cells with optimized architecture, these modules maximize the use of available surface area, offering high power output while maintaining dimensions convenient for rooftop installations. A key advantage of the Basin series is the bifacial double-glass design, which, through the use of glass on both sides of the module, provides extreme resistance to moisture, ammonia, and mechanical loads. This eliminates the risk of micro-cracks and significantly extends the system lifespan, solving the problem of rapid component degradation. Investing in these modules guarantees an exceptionally low temperature coefficient, which means the system maintains high energy production even during summer heatwaves. This series is primarily dedicated to demanding prosumers who care about maximizing yields per square meter while maintaining the highest aesthetics. Compared to the competition, this product stands out with an almost zero LID degradation effect and an extended warranty on linear power decrease, making it one of the safest and most stable choices on the Polish market.
Ranking
Signals from the data
Residential and hot-climate.
Weight-limited structures.
Top 21% of the N-type 450-500 W segment, against a median of -0.290.
Bottom 22% of the N-type 450-500 W segment, against a median of 49.5.
The Basin series uses N-type TOPCon cells on rectangular 182mm wafers, virtually eliminating LID (Light-Induced Degradation) and maximizing module fill factor. The rectangular cell geometry (191R designation) delivers up to 475 Wp within standard rooftop frame dimensions, and the typical N-type TOPCon Pmax temperature coefficient (~-0.30%/°C) is notably superior to PERC modules (-0.35%/°C).
Tempered glass on both sides (double glass) replaces a hydrolysis- and micro-crack-prone backsheet, providing resistance to ammonia and mechanical loads above the standard 5400 Pa. The bifacial design captures reflected irradiance from the ground surface, delivering a typical energy gain of 5–15% depending on albedo — directly boosting annual yield on installations with light-colored or snow-covered substrates.
Horay Solar backs the Basin series with a 30-year linear power warranty, matching peers such as JA Solar JAM54D40 LB and Longi Hi-MO X10 in the 475 Wp segment. The linear structure avoids stepped degradation thresholds, guaranteeing a higher minimum output in every year of operation compared to tiered warranty models.
Horay Solar officially joined the Bloomberg NEF Tier-1 Solar Module Manufacturers list in Q1 2025, confirming the company's bankability. This status is a prerequisite for project financing by banks and investment funds and is a key risk-assessment criterion for prosumers pursuing PV loans or leasing arrangements.
The Basin series tops out at 23.0% module efficiency, while direct peer comparables — JA Solar JAM54D40 LB and Astronergy ASTRO N7s 2.0 — both reach 23.8% at the same 475 Wp rating. The 0.8 percentage-point gap translates to approximately 3.5% less energy from an identical roof area; on a typical 10 kWp residential system this amounts to roughly 300–380 kWh/year of foregone generation versus the most efficient Tier-1 alternatives.
Horay Solar's annual production capacity is approximately 2.5 GW with a workforce of ~400 employees — a fraction of JA Solar (~70 GW) or Longi Solar (~85 GW). Given a 30-year linear power warranty, this scale disparity is a tangible risk factor regarding the manufacturer's long-term ability to honor warranty obligations and maintain a global service network.
- At 22.6% efficiency, this panel is on par with typical N-type 450-500W modules
- At 225.4 W/m² power density, roof space requirements are typical for N-type 450-500W panels
- Temperature coefficient of -0.28%/°C matches the N-type 450-500W median
- Weight of 25.0 kg is 1.3 kg above N-type 450-500W median (23.7 kg) - verify structural support
- 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 460 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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