--- title: "Horay Solar HS640TC-MHD-D 640W Solar Panel - Specs & Review | ComparePV" description: "Horay Solar HS640TC-MHD-D 640W solar panel. Specs: 22.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/horay-solar-hs640tc-mhd-d" updated: 2026-09-11 --- # Horay Solar HS640TC-MHD-D Strong in heat, no clear weak spot 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Horay Solar - **Model:** HS640TC-MHD-D - **Series:** HS 199R-144 TC-D Delta - **Rated power:** 640 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) | 640 W | 625 W | Strong - top 11% | | | Module efficiency | 22.90% | 22.77% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,389 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 14% | 1,309 | | Weight (kg) | 34.5 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.90% | 22.77% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,389 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 14% | 1,309 | | Weight per kWp | 53.9 | 52.7 | Typical | 8,037 | | 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. - **Best for:** Commercial, utility-scale, hot-climate and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.90 % - **Voltage at Pmax (Vmp):** 40.79 V - **Current at Pmax (Imp):** 15.69 A - **Open-circuit voltage (Voc):** 48.08 V - **Short-circuit current (Isc):** 16.71 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:** 144 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 34.5 kg - **Area:** 2.80 m2 - **Power density:** 229.0 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:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2359 of 14005 | | Power density | 2389 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 8037 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon – low degradation rate** - N-type TOPCon cells degrade at ~0.40–0.45%/year versus 0.6–0.8%/year for P-type PERC, while being fully immune to LID and LeTID. This translates into meaningfully higher energy yields in years 20–30 of system life at the same nominal nameplate power. - **Bifacial dual-glass construction** - A bifaciality factor above 80% enables 5–15% additional rear-side energy gain from ground albedo in utility-scale and light-rooftop installations. The dual-glass bill eliminates the backsheet, improving moisture resistance and reducing micro-crack propagation risk — critical for 30-year project lifetimes. - **30-year linear power warranty** - Horay Solar backs the Delta series with a 30-year linear power warranty — matching industry leaders such as Jinko Tiger Neo and Astronergy ASTRO N5. The guaranteed annual degradation cap of ≤0.55%/year meets premium N-type TOPCon standards and supports bankability for project finance. - **BNEF Tier-1 status – confirmed bankability** - Horay Solar has been listed on the BloombergNEF Tier-1 PV Module Manufacturer ranking since Q1 2025, reconfirmed for Q1 2026. Tier-1 status means modules qualify for bank and fund financing without additional credit insurance — a prerequisite for commercial and utility-scale CAPEX structures. - **630–650 Wp per module – lower BoS cost** - The 630–650 Wp power range at 22.5–23.3% efficiency reduces module count per MW of installed capacity. Fewer modules mean less racking, fewer MC4 connectors, and shorter string runs, generating measurable BoS savings of 2–4% of total CAPEX on large commercial or ground-mount projects. ## Cons - **15-year product warranty – below top peers** - The Delta series carries a 15-year product warranty (materials and workmanship), while direct comparable Astronergy ASTRO N5 offers 30 years and Jinko Solar Tiger Neo 66HL4M-BDX offers 25 years. The gap is material for EPC contracts with long O&M schedules or insurer warranty requirements. - **Peak efficiency below segment leader** - Maximum module efficiency is 23.3%, versus 24.06% for the Jinko Solar Tiger Neo 66HL4M-BDX in the same power class (up to 650 Wp) — a delta of 0.76 percentage points. On a 1 MWp rooftop with fixed area, this translates to roughly 3.3% less annual energy output compared to the segment leader, which can be decisive where roof space is constrained. ## About this series The Horay Solar HS 199R-144 TC-D Delta series redefines performance standards through the use of advanced **N-type TOPCon cell technology**. Utilizing this innovation allows for significantly higher efficiency compared to traditional P-type modules, especially in low sunlight conditions. The **bifacial glass-glass** construction makes the panels not only extremely durable and resistant to micro-cracks, but also capable of generating additional energy from radiation reflected from the ground. This is a key advantage in commercial installations and photovoltaic farms, where every watt per square meter counts. Investors will appreciate the **minimal annual degradation**, which guarantees stable yields for decades, eliminating the problem of rapid installation power loss. These modules solve the problem of system overheating in full sun thanks to a low temperature coefficient, which translates into real financial gains during summer production peaks. This product is dedicated to demanding users looking for a balance between modern aesthetics and **maximum mechanical lifespan**. Thanks to resistance to the PID effect and the influence of ammonia and salt mist, the Delta series performs perfectly even in harsh environmental conditions, setting itself apart from the competition with exceptional long-term operational stability. ## Notable figures - Efficiency of 22.9% matches the \*\*N-type 600-650W\*\* median - Power density of 228.9 W/m² matches the \*\*N-type 600-650W\*\* median - Temperature coefficient of -0.28%/°C matches the \*\*N-type 600-650W\*\* median - At 34.5 kg (2.0 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 is N-type TOPCon technology and why does the Horay Solar HS 199R-144 TC-D Delta series use it? N-type TOPCon is one of the most advanced solar cell technologies currently available. Compared to conventional P-type PERC cells, N-type cells deliver higher efficiency, lower annual degradation, and better low-light performance. Thanks to TOPCon technology, the Delta series reaches up to 650 Wp and maintains stable energy output year-round, including overcast days and during morning or evening hours. ### What is the warranty on the Horay Solar HS 199R-144 TC-D Delta panels? The Delta series comes with a 15-year product warranty covering material and workmanship defects, and a 30-year power output warranty. The power warranty guarantees that the modules will maintain a specified efficiency level for three decades — one of the longest warranty terms in the industry, reflecting the superior quality of the N-type cells used in this series. ### Are the Horay Solar HS 199R-144 TC-D Delta panels bifacial and how much extra energy can the rear side generate? Yes, the HS 199R-144 TC-D Delta is a bifacial glass-glass module capable of absorbing irradiance from both the front and rear surfaces. The additional energy gain from albedo reflection typically ranges from 5 to 30%, depending on the installation substrate. Lighter surfaces such as white roofing membranes, light gravel, or snow maximize bifacial gain, making the Delta series ideal for ground-mounted farms and commercial rooftop installations. ### How do the Horay Solar HS 199R-144 TC-D Delta panels perform in high temperatures during summer heat waves? Thanks to the low temperature coefficient typical of N-type TOPCon technology, the Delta series loses less power on hot days compared to conventional P-type modules. In practice, this translates into higher summer yields and a better ROI during peak production season. The glass-glass construction also improves heat dissipation and extends the module's mechanical service life. ### Are the Horay Solar HS 199R-144 TC-D Delta panels suitable for coastal or agricultural environments? Yes. The Delta series features confirmed resistance to PID, ammonia exposure relevant near livestock facilities, and salt mist important for coastal installations. The glass-glass design eliminates the backsheet, reducing the risk of moisture ingress and mechanical damage. This makes the Delta series an excellent choice for demanding locations where standard modules would degrade significantly faster. ### Is Horay Solar a Tier 1 manufacturer and can it be trusted for a large-scale PV investment? Yes, Horay Solar holds Tier 1 classification, awarded to manufacturers meeting strict financial and quality criteria, which simplifies project financing through banks and leasing institutions. The 30-year power warranty and 15-year product warranty on the Delta series demonstrate the manufacturer's long-term commitment to the product — a critical factor for commercial and utility-scale PV investments. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HS199R-144TC-D-Delta-650W-a5b9b11bd78c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, lighter, +2.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, lighter, +2.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +30 W, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +30 W, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Horay Solar HS630TC-MHD-D](https://comparepv.com/panel/horay-solar-hs630tc-mhd-d) | 630 W | -10 W, -0.4 pp | | [Horay Solar HS635TC-MHD-D](https://comparepv.com/panel/horay-solar-hs635tc-mhd-d) | 635 W | Very close match | | [Horay Solar HS645TC-MHD-D](https://comparepv.com/panel/horay-solar-hs645tc-mhd-d) | 645 W | +0.2 pp | | [Horay Solar HS650TC-MHD-D](https://comparepv.com/panel/horay-solar-hs650tc-mhd-d) | 650 W | +10 W, +0.4 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +2.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +55 W, cooler, +2.0 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +30 W, cooler, +1.9 pp | --- Source: https://comparepv.com/panel/horay-solar-hs640tc-mhd-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.