--- title: "Horay Solar HS635TC-MHG-D 635W Solar Panel - Specs & Review | ComparePV" description: "Horay Solar HS635TC-MHG-D 635W solar panel. Specs: 22.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/horay-solar-hs635tc-mhg-d" updated: 2026-09-11 --- # Horay Solar HS635TC-MHG-D Strong in heat, heavy for its output 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Horay Solar - **Model:** HS635TC-MHG-D - **Series:** HS 210-120 TC-D Galaxy - **Rated power:** 635 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 635 W | 625 W | Strong - top 22% | | | Module efficiency | 22.40% | 22.77% | Typical | 4,774 | | Power density | 224.2 | 227.7 | Typical | 4,762 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 14% | 1,309 | | Weight (kg) | 35.0 kg | 32.5 kg | Weak - bottom 19% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.40% | 22.77% | Typical | 4,774 | | Power density | 224.2 | 227.7 | Typical | 4,762 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 14% | 1,309 | | Weight per kWp | 55.1 | 52.7 | Weak - bottom 19% | 9,548 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-0.280 %/°C temperature coefficient** - Top 14% of the N-type 600-650 W segment, against a median of -0.290. ### Watch out for - **55.1 kg per kWp** - Bottom 19% of the N-type 600-650 W segment, against a median of 52.7. - **Best for:** Hot roofs and southern climates. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 635 W - **Efficiency:** 22.40 % - **Voltage at Pmax (Vmp):** 38.70 V - **Current at Pmax (Imp):** 16.41 A - **Open-circuit voltage (Voc):** 44.94 V - **Short-circuit current (Isc):** 17.72 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/degC - **Temperature coefficient of Voc:** -0.230 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 120 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2174 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 35.0 kg - **Area:** 2.83 m2 - **Power density:** 224.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 555 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4774 of 14005 | | Power density | 4762 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 9548 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon – zero LID** - N-type cell architecture eliminates both Light-Induced Degradation (LID) and Light and Elevated Temperature Induced Degradation (LeTID), which are chronic issues in p-type PERC technology. Annual degradation sits at 0.4–0.5% vs. 0.6–0.8% for PERC, resulting in measurably higher cumulative energy yield over the 30-year asset life. - **High bifaciality factor (~85%)** - The double-glass bifacial design captures reflected irradiance on the rear surface with a bifaciality factor of ~85%, versus ~70% for bifacial PERC. On ground-mount installations with albedo ≥0.20 — typical of Polish utility-scale sites — this translates into an additional 8–15% annual energy yield compared to monofacial equivalents. - **30-year power warranty (87.4% Pnom)** - Horay Solar guarantees a minimum of 87.4% of rated power after 30 years, as published in the Galaxy series datasheet. For utility-scale PV assets with standard 25–30-year financing tenors, this single power warranty covers the full debt-service period without re-certification risk. - **BNEF Tier-1 bankability (Q1 2026)** - Horay Solar has held BNEF Tier-1 PV Module Manufacturer status continuously since Q1 2025, confirmed on the Q1 2026 list. Tier-1 designation is a prerequisite for project finance approval from most European and Polish lending institutions, enabling debt financing without supplementary manufacturer-risk collateral. - **210 mm wafers + SMBB interconnection** - Large-format 210 mm cells combined with Super Multi Busbar (SMBB) technology shorten internal current paths, reducing resistive losses and improving fill factor. This configuration also delivers improved partial-shading tolerance compared to 182 mm modules built on conventional busbar layouts. ## Cons - **Module efficiency below peer comparables** - The Galaxy series peaks at 22.4% module efficiency, while direct competitors in the same 615–635 Wp power class outperform it: Talesun TM7G78M at 22.72%, LONGi Hi-MO X10 LR7-72HVD at 23.5%, and Sunpro TOPCon 210R at 23.51%. The gap to segment leaders exceeds 1 percentage point, translating to lower LCOE on area-constrained sites or higher BoS cost per MW for ground-mount projects. - **15-year product warranty (industry standard: 25 years)** - The Galaxy series carries a 15-year module product warranty, compared to the 25-year standard offered by Tier-1 peers such as LONGi on their dual-glass Hi-MO X10 line. For ground-mount assets financed over 20–25-year tenors, this shortfall may trigger additional technical due-diligence requirements from project lenders and insurance underwriters. ## About this series The Horay Solar HS 210-120 TC-D Galaxy panel series sets new efficiency standards through the use of modern **N-Type TOPCon cells**. This solution effectively eliminates the problem of light-induced degradation, resulting in a significantly longer lifespan and yield stability compared to traditional modules. The **bifacial double-glass** design allows for the efficient use of light reflected from the ground, which is key to optimizing energy costs in large commercial projects and solar farms. The use of innovative **210 mm large-scale cells** in combination with SMBB multi-busbar technology drastically reduces power transmission losses within the module. This series solves the problem of efficiency loss at high temperatures, offering an exceptionally favorable temperature coefficient of power. Investors primarily benefit from a **high bifaciality factor**, which allows for additional energy generation from the rear surface of the panel, providing a real competitive advantage in Polish climate conditions when using a light-colored surface. This equipment is designed to maximize the profitability of ground-mounted installations, providing high mechanical resistance to snow and wind loads, which guarantees investment security for many years. ## Notable figures - Efficiency of 22.4% matches the \*\*N-type 600-650W\*\* median - Power density of 224.2 W/m² is 3.5 W/m² below \*\*N-type 600-650W\*\* median (227.7 W/m²) - needs more roof space - At -0.28%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - At 35.0 kg (2.5 kg above \*\*N-type 600-650W\*\* median of 32.5 kg), requires checking roof load capacity - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What warranty does the Horay Solar HS 210-120 TC-D Galaxy series come with? Horay Solar provides a 15-year product warranty and a 30-year linear power output warranty on the HS 210-120 TC-D Galaxy series. The 30-year power guarantee is among the longest available on the market and reflects the manufacturer's confidence in the durability of the N-Type TOPCon cell technology combined with the double-glass bifacial construction. ### What is N-Type TOPCon technology and why is it better than standard PERC? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell architecture that virtually eliminates light-induced degradation (LID). Compared to conventional P-type PERC cells, N-Type TOPCon achieves higher efficiency, a better temperature coefficient of power, and slower long-term degradation over a 30-year system lifetime. For an investor, this translates into more kilowatt-hours generated from the same roof or ground area. ### How much extra energy can I expect from the bifacial design of the HS 210-120 TC-D Galaxy? The bifacial double-glass construction harvests light reflected off the ground surface, which can increase energy yield by 5 to 15 percent depending on ground albedo. Light-colored surfaces such as gravel, concrete, or snow deliver the best results. The HS 210-120 TC-D Galaxy has a high bifaciality factor, making it especially well-suited for ground-mounted systems where the ground surface can be optimized. ### Is the Horay Solar HS 210-120 TC-D Galaxy suitable for a large utility-scale solar farm? Yes, this series is designed for commercial and utility-scale ground-mounted PV plants. At 635 Wp peak power and using 210 mm large-format cells, fewer modules are needed per MW, reducing BoS and installation costs. The bifacial double-glass structure provides high mechanical resistance to snow and wind loads. As a Tier 1 manufacturer, Horay Solar meets bankability requirements for project financing. ### How does the HS 210-120 TC-D Galaxy perform on hot days when other modules lose efficiency? N-Type TOPCon cells have a more favorable temperature coefficient of power than conventional PERC modules. This means the panel loses proportionally less output as cell temperature rises. On hot summer days, the HS 210-120 TC-D Galaxy produces more energy than same-rated older-generation modules, which directly improves the annual yield of the installation and lowers LCOE. ### Is Horay Solar a reliable manufacturer and is after-sales service available? Horay Solar is a certified Tier 1 manufacturer, recognized by independent market analysts as financially stable and technically credible. Products comply with IEC certification standards. Before purchasing, confirm with your local distributor in Poland that warranty claims can be processed domestically and clarify the terms of after-sales service, as the quality of support depends on the local importer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HS210-120TC-D-Galaxy-635W-bcaebef41923.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +45 W, lighter, +2.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +40 W, lighter, +2.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +35 W, lighter, +2.4 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +35 W, lighter, +2.4 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.4 pp | | [Horay Solar HS615TC-MHG-D](https://comparepv.com/panel/horay-solar-hs615tc-mhg-d) | 615 W | -20 W, -0.7 pp | | [Horay Solar HS620TC-MHG-D](https://comparepv.com/panel/horay-solar-hs620tc-mhg-d) | 620 W | -15 W, -0.5 pp | | [Horay Solar HS625TC-MHG-D](https://comparepv.com/panel/horay-solar-hs625tc-mhg-d) | 625 W | -10 W, -0.3 pp | | [Horay Solar HS630TC-MHG-D](https://comparepv.com/panel/horay-solar-hs630tc-mhg-d) | 630 W | Very close match | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, lighter, +1.6 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | Hotter, lighter, +1.5 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +35 W, cooler, +1.3 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | Hotter, lighter, +1.3 pp | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | +30 W, cooler, +1.1 pp | --- Source: https://comparepv.com/panel/horay-solar-hs635tc-mhg-d Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.