Strong in heat, no clear weak spot
The innovative Horay Solar Delta series of photovoltaic panels focuses on maximizing yields from limited roof space through the use of modern N-type TOPCon cell technology. This solution effectively eliminates the problem of light-induced degradation (LID) and guarantees exceptional performance even on cloudy days, which is crucial in the Polish climate zone. These modules are characterized by high energy conversion efficiency, achieved through the use of high-density cell packing and SMBB technology, which shortens the current flow path and minimizes resistive losses. The Delta series was designed for investors seeking uncompromising durability, as confirmed by increased resistance to extreme mechanical loads, such as strong winds or heavy snow. For owners of single-family homes, the aesthetic design will be key, while for the commercial sector, the low temperature coefficient will prove decisive, ensuring stable operation on hot days. By choosing these panels, you gain a longer warranty period for power output, which directly translates into a faster return on investment and greater financial security for years to come. This is an optimal choice for prosumer installations, where every watt of power obtained from a square meter of mounting surface counts.
Ranking
Signals from the data
Residential, commercial and hot-climate.
Top 21% of the N-type 450-500 W segment, against a median of -0.290.
N-type TOPCon cells eliminate light-induced degradation (LID) and deliver a lower temperature coefficient than legacy PERC cells, resulting in a measurably higher annual energy yield - particularly relevant in Poland's climate with frequent overcast days and wide temperature swings. Super Multi Busbar (SMBB) technology further reduces internal resistance losses and lowers susceptibility to microcracks over the module's service life.
All five variants in the Delta series are bifacial modules, generating power from both the front and rear surfaces. On installations with high-albedo substrates (gravel, white roofing membrane, concrete) or tracker-mounted arrays, bifacial gain typically reaches 10-20% above nameplate power, improving the project's economic return without increasing the mounting footprint.
Horay Solar backs the Delta series with a 30-year linear power output warranty - longer than the 25-year standard offered by direct peers including ZNShine (ZXM7-UHLD120 Series). A longer power warranty horizon reduces investor risk and improves LCOE calculations on projects structured around long-term debt-service schedules.
Horay Solar maintained its BloombergNEF Tier-1 PV Module Manufacturer status on the Q1 2026 list. BNEF Tier-1 bankability is a prerequisite for institutional project financing in most markets, making the Delta series eligible for credit-backed residential installs and larger commercial PV projects requiring third-party financing.
The Delta series tops out at 23% module efficiency, while the directly comparable Gokin GK-5-54HG and GK-5-54HGb achieve 24.3% at the same 485 Wp peak power - a gap of 1.3 percentage points equates to roughly 5-6% greater module area required for equivalent installed capacity. On space-constrained rooftop installations this translates to measurable lost power output per available square meter compared to the Gokin offering.
The Delta series carries only a 15-year materials-and-workmanship warranty, whereas leading N-type TOPCon competitors - JinkoSolar Tiger Neo, LONGi Hi-MO 6, and Trina Vertex N - provide 25-year product warranties as standard. This means the final 15 years of the 30-year power guarantee period are not covered by product warranty, increasing long-term replacement-cost risk for the system owner.
- Efficiency of 23.0% matches the N-type 450-500W median
- At 229.7 W/m² power density, this panel generates 4.4 W/m² more per unit area than N-type 450-500W median (225.3 W/m²)
- Temperature coefficient of -0.28%/°C matches the N-type 450-500W median
- At 26.0 kg (2.3 kg above N-type 450-500W median of 23.7 kg), requires checking roof load capacity
- Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
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 485 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 Delta series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.