--- title: "Tongwei TWMNH-66HS635 Solar Panel: Specs & Datasheet | ComparePV" description: "Tongwei TWMNH-66HS635 solar panel. Specs: 23.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/tongwei-twmnh-66hs635" image: "https://comparepv.com/og/panel/tongwei-twmnh-66hs635.png" updated: 2026-09-11 --- # Tongwei TWMNH-66HS635 Light for its output, no clear weak spot 368 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Tongwei - **Model:** TWMNH-66HS635 - **Series:** TWMNH - **Rated power:** 635 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 600-650 W (368 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 635 W | 625 W | Strong - top 22% | | | Module efficiency | 23.50% | 22.77% | Strong - top 12% | 749 | | Power density | 235.1 | 227.7 | Strong - top 12% | 777 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 29.0 kg | 32.8 kg | Strong - top 7% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.50% | 22.77% | Strong - top 12% | 749 | | Power density | 235.1 | 227.7 | Strong - top 12% | 777 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 45.7 | 52.8 | Strong - top 7% | 833 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **45.7 kg per kWp** - Top 7% of the N-type 600-650 W segment, against a median of 52.8. Ranked 833rd in the whole database. - **235.1 watts per square metre** - Top 12% of the N-type 600-650 W segment, against a median of 227.7. - **23.50% module efficiency** - Top 12% of the N-type 600-650 W segment, against a median of 22.77%. - **Best for:** Commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 635 W - **Efficiency:** 23.50 % - **Voltage at Pmax (Vmp):** 41.11 V - **Current at Pmax (Imp):** 15.45 A - **Open-circuit voltage (Voc):** 49.65 V - **Short-circuit current (Isc):** 16.26 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 132 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 29.0 kg - **Area:** 2.70 m2 - **Power density:** 235.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 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 | 749 of 14129 | | Power density | 777 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 833 of 14129 | | Warranty | 21 of 14129 | ## About this series Tongwei TWMNH series photovoltaic panels are based on advanced **N-type TOPCon** cells, which represents a significant technological leap compared to traditional P-type modules. The use of **Super Multi-Busbar (SMBB)** technology allows for more efficient light capturing and a significant reduction in the current flow path, which directly translates into lower internal power losses. For investors, an effective solution to the problem of degradation caused by light and high ambient temperatures is key - the TWMNH series is characterized by **exceptional resistance to LID and LeTID degradation** and a very favorable temperature coefficient. As a result, photovoltaic systems operate extremely efficiently even on hot summer days, generating more energy from the same roof or ground area. These modules are primarily dedicated to demanding commercial and industrial installations, where the priority is maximizing the return on investment in the long term. What clearly distinguishes them from market competition is their **high efficiency in low-light conditions** and precise quality control at every stage of cell production, which guarantees full repeatability of technical parameters. By choosing the TWMNH series, the investor gains the assurance of stable and failure-free system operation for many decades, making these panels one of the most cost-effective choices in today's modern photovoltaics market. ## Notable figures - At 23.5% efficiency, this panel is 0.7pp above typical \*\*N-type 600-650W\*\* modules (median: 22.8%) - Power density of 235.1 W/m² packs 7.4 W/m² more into the same footprint vs \*\*N-type 600-650W\*\* median (227.7 W/m²) - Temperature coefficient of -0.29%/°C matches the \*\*N-type 600-650W\*\* median - At 29.0 kg, this panel is 3.8 kg lighter than \*\*N-type 600-650W\*\* median (32.8 kg) - easier handling during installation - In the top 5% for efficiency among all N-type panels ## Questions ### How does N-type TOPCon cell technology in the Tongwei TWMNH series differ from traditional P-type cells? N-type TOPCon cells used in the TWMNH series feature an additional passivation layer that significantly reduces electron recombination on the rear side of the cell. In practice, this delivers higher efficiency (often above 23%), lower degradation over time, and better performance at high temperatures compared to classic P-type PERC modules. It's a newer-generation technology now considered the premium standard in solar. ### What warranty comes with Tongwei TWMNH panels and what does it cover? The TWMNH series comes with a 15-year product warranty covering material and manufacturing defects, plus a 30-year linear power output warranty. This means the manufacturer guarantees a defined minimum energy generation level over three decades, with a slow, predictable power decline over time - an important factor when calculating long-term return on investment. ### Are Tongwei TWMNH panels rated at 635 W suitable for residential installations, or only commercial ones? TWMNH panels rated up to 635 Wp have large form factors and high output current, making them primarily designed for commercial, industrial, and utility-scale solar farm installations where maximizing power per square meter matters most. On a typical sloped residential roof they may be too large and heavy for convenient installation - smaller residential-class modules are usually a better fit in that case. ### Are Tongwei TWMNH panels bifacial, generating power from the rear side as well? No, TWMNH series panels in this configuration are mono-facial modules - they generate power only from the front side. This makes installation simpler and less dependent on ground reflectivity compared to bifacial panels, which need a bright, light-reflecting surrounding surface to fully exploit rear-side generation potential. ### How do TWMNH panels perform during summer heat on a hot rooftop? Thanks to TOPCon cell technology and Super Multi-Busbar (SMBB) design, the TWMNH series has a favorable power temperature coefficient, meaning less output loss as module temperature rises on hot days. These panels are also resistant to LID and LeTID degradation, caused by the combination of light exposure and high heat, so they retain more power in summer than typical P-type modules. ### Is Tongwei a reliable Tier 1 solar panel manufacturer, and are TWMNH panels a safe investment choice? Yes, Tongwei is a Chinese manufacturer classified as Tier 1, reflecting its financial stability, large-scale cell production, and long-standing international market presence. The TWMNH series undergoes rigorous quality control at every production stage, and these models remain in active production and available for purchase, making them a safe choice for long-term commercial investments. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/TWMNH-66HS-61563535F-627656d3141f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +45 W, cooler, +1.7 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +40 W, cooler, +1.5 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.5 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +40 W, heavier, +1.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +35 W, cooler, +1.3 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +35 W, cooler, +1.3 pp | | [Tongwei TWMNH-48HC](https://comparepv.com/panel/tongwei-twmnh-48hc) | 450 W | -185 W, -6.8 pp | | [Tongwei TWMNH-54HD](https://comparepv.com/panel/tongwei-twmnh-54hd) | 515 W | -120 W, -4.4 pp | | [Tongwei TWMNH-66HD600](https://comparepv.com/panel/tongwei-twmnh-66hd600) | 600 W | -35 W, heavier, -1.3 pp | | [Tongwei TWMNH-66HD605](https://comparepv.com/panel/tongwei-twmnh-66hd605) | 605 W | -30 W, heavier, -1.1 pp | | [Tongwei TWMNH-66HD610](https://comparepv.com/panel/tongwei-solar-twmnh-66hd610) | 610 W | -25 W, heavier, -0.9 pp | | [Tongwei TWMNH-66HD615](https://comparepv.com/panel/tongwei-solar-twmnh-66hd615) | 615 W | -20 W, heavier, -0.7 pp | | [Tongwei TWMNH-66HD620](https://comparepv.com/panel/tongwei-solar-twmnh-66hd620) | 620 W | -15 W, heavier, -0.5 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +65 W, heavier, +1.5 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +60 W, heavier, +1.4 pp | --- Source: https://comparepv.com/panel/tongwei-twmnh-66hs635 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.