Light for its output, no clear weak spot
Horay Solar HS 191R-108 TC Basin photovoltaic panels are an advanced solution based on innovative architecture that significantly increases the efficiency of residential and commercial installations. The key differentiator of this series is N-type TOPCon technology, which allows for significantly better energy yields even in low light conditions or at high ambient temperatures. Thanks to the use of the 182mm rectangular cell format, these modules offer higher power density while maintaining optimal dimensions, solving the problem of limited installation space on roofs with complex geometry. The Basin series is characterized by exceptional durability and minimal light-induced degradation, which translates into stable power production for decades. They stand out from the competition due to their precise aesthetic refinement and excellent temperature coefficient of power, making the system work more efficiently on hot days. This is an ideal choice for investors seeking maximum efficiency per square meter who refuse to compromise between modern design and technical reliability. Utilizing this series is an investment in energy stability that reduces operating costs thanks to higher conversion efficiency and resistance to external factors.
Ranking
Signals from the data
Weight-limited structures and hot roofs and southern climates.
Top 12% of the N-type 450-500 W segment, against a median of 49.5.
Top 21% of the N-type 450-500 W segment, against a median of -0.290.
N-type TOPCon cells exhibit annual degradation of ~0.35%/yr vs. ~0.55%/yr for older P-type PERC, with near-zero LID (Light-Induced Degradation). This translates to a meaningfully higher cumulative energy yield over a 30-year system lifetime compared to PERC modules of equivalent STC power rating.
Horay Solar provides a 30-year linear power warranty — above the market norm where most mid-range series cap at 25 years. The extended warranty horizon lowers system LCOE and satisfies bankability requirements for commercial projects that undergo lender due diligence.
Horay Solar is listed on the BloombergNEF Tier 1 Module Manufacturer register (confirmed Q1 2026), signaling acceptance by project finance institutions. For utility-scale and C&I installations, Tier 1 status is a prerequisite for structuring non-recourse project finance.
The 108-cell, 182 mm half-cut configuration delivers up to 23.3% efficiency (475 Wp variant), reduces resistive losses by ~3%, and improves partial-shade tolerance. At 23.3%, the top variant matches the direct competitor LONGi Hi-MO X10 Explorer (23.3%) within the same 475 Wp power class.
Peak module efficiency of 23.3% (475 Wp variant) trails both JA Solar JAM54D40 LB and Astronergy ASTRO N7s 2.0, which reach 23.8% at the same nameplate power. The 0.5 pp gap translates to ~2.1% less energy per unit rooftop area — a meaningful disadvantage on space-constrained residential or commercial rooftops.
The HS 191R-108 TC Basin series is not available in a bifacial variant (is_bifacial: false). On high-albedo surfaces (light gravel, concrete, snow; albedo 0.25–0.50), bifacial modules typically capture 5–15% additional rear-side irradiance, a gain entirely unavailable in this series.
The product (materials & workmanship) warranty is 12 years, whereas leading N-type TOPCon series from LONGi (Hi-MO X10) and JA Solar (Deep Blue 4.0 Pro) carry 15-year product warranties. The shorter coverage may be a limiting factor in projects subject to strict lender bankability requirements or markets with mandatory long-term asset insurance.
- Efficiency of 22.8% matches the N-type 450-500W median
- At 227.8 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 21.0 kg (2.7 kg below N-type 450-500W median of 23.7 kg) allows easier transport and roof mounting
- Ranked #2714 out of 14005 panels for efficiency in the database
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 465 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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