--- title: "Tongwei TWMNF-66HD720XX 720W Solar Panel - Specs & Review | ComparePV" description: "Tongwei TWMNF-66HD720XX 720W solar panel. Specs: 23.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hd720xx" updated: 2026-09-11 --- # Tongwei TWMNF-66HD720XX Efficiency leader, no clear weak spot 90 panels in the segment N-type 700-750 W ## Identity - **Manufacturer:** Tongwei - **Model:** TWMNF-66HD720XX - **Series:** TWMNF N-type Half-cell Bifacial Module(66) 66HD700–720W - **Rated power:** 720 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 700-750 W (90 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 720 W | 710 W | Strong - top 21% | | | Module efficiency | 23.20% | 22.88% | Strong - top 17% | 1,306 | | Power density | 231.8 | 228.6 | Strong - top 21% | 1,347 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 19% | 1,309 | | Weight (kg) | 37.9 kg | 38.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.20% | 22.88% | Strong - top 17% | 1,306 | | Power density | 231.8 | 228.6 | Strong - top 21% | 1,347 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 19% | 1,309 | | Weight per kWp | 52.6 | 53.5 | Typical | 6,266 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.20% module efficiency** - Top 17% of the N-type 700-750 W segment, against a median of 22.88%. - **-0.280 %/°C temperature coefficient** - Top 19% of the N-type 700-750 W segment, against a median of -0.290. - **231.8 watts per square metre** - Top 21% of the N-type 700-750 W segment, against a median of 228.6. - **Best for:** Utility-scale, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 720 W - **Efficiency:** 23.20 % - **Voltage at Pmax (Vmp):** 41.03 V - **Current at Pmax (Imp):** 17.55 A - **Open-circuit voltage (Voc):** 49.28 V - **Short-circuit current (Isc):** 18.55 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/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 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 37.9 kg - **Area:** 3.11 m2 - **Power density:** 231.8 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 % - **Output after 30 years:** 629 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1306 of 14005 | | Power density | 1347 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 6266 of 14005 | | Warranty | 21 of 14005 | ## About this series Tongwei TWMNF N-type Half-Cell Bifacial Module (66) 66HD700-720W was designed for installations where maximum yield from every square meter counts - without compromising on reliability. The application of **N-type technology in a half-cell configuration** improves performance under partial shading and minimizes losses in daily, variable sunlight conditions. The **bifacial glass-glass construction** additionally utilizes reflected light from the ground, effectively boosting energy production on PV farms, carports, and large roofs with light membranes. A key feature is the focus on stable parameters over time - the series offers **ultra-low degradation and a 30-year linear power output warranty**, facilitating financial planning and reducing the energy cost over the entire lifetime. This is further supported by solutions limiting the risk of micro-cracks and **high mechanical strength**, crucial in windy and snowy conditions. It is the choice for C&I and utility investors seeking more energy from the same surface area and a more certain return on investment. ## Notable figures - At 23.2% efficiency, this panel is on par with typical \*\*N-type 700-750W\*\* modules - At 231.8 W/m² power density, this panel generates 3.2 W/m² more per unit area than \*\*N-type 700-750W\*\* median (228.6 W/m²) - At -0.28%/°C, hot weather performance is typical for \*\*N-type 700-750W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 9% for efficiency among all N-type panels ## Questions ### Is the Tongwei TWMNF 66HD700-720W series still available for purchase? The Tongwei TWMNF N-type Half-cell Bifacial Module(66) 66HD700-720W has been discontinued and replaced by newer manufacturer series. Units may still be available from distributors with remaining stock, but we recommend contacting your supplier to confirm current availability and warranty terms for purchased units. ### What does N-type technology mean in Tongwei TWMNF panels and how does it differ from P-type? N-type cells used in the TWMNF series show lower degradation over time and better tolerance to metal impurities in silicon than traditional P-type cells. In practice this means higher initial efficiency, a smaller first-year power drop, and more stable energy output throughout the 30-year linear power warranty period. ### Are Tongwei TWMNF 66HD panels bifacial, and how much extra energy does that provide? Yes, the TWMNF 66HD series uses a glass-glass bifacial construction, generating power from both sides of the module. The rear side captures light reflected from the ground, roof, or surroundings, which - depending on surface albedo and mounting height - can increase total energy yield by several to over a dozen percent compared to monofacial panels. ### What warranty applies to the Tongwei TWMNF 66HD700-720W panels? The manufacturer covers the TWMNF 66HD700-720W series with a 12-year product warranty and a 30-year linear power output warranty. This warranty structure guarantees a predictable power degradation curve over time, helping investors accurately model ROI and levelized cost of energy (LCOE) across the entire lifecycle of the installation. ### Are Tongwei TWMNF 66HD700-720W panels suitable for solar farms and carports? With power output up to 720 Wp and a glass-glass bifacial construction, these panels are primarily suited for large-scale C&I and utility installations - solar farms, carports, and large flat roofs with a light-colored membrane that boost rear-side light reflection. The high per-unit power reduces the number of modules needed to reach a target installation capacity. ### Can Tongwei TWMNF panels withstand heavy snow and wind loads? The TWMNF series is engineered for high mechanical load resistance, reducing the risk of cell microcracks under heavy snow and strong wind. The rigid glass-glass construction further increases module stiffness and durability in demanding climates, which is important when designing large ground-mount and rooftop installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/3-9b411ba86d3d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -40 W, lighter, +2.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -45 W, lighter, +1.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +1.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -25 W, lighter, +1.7 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | -50 W, lighter, +1.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | -50 W, lighter, +1.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | -50 W, lighter, +1.6 pp | | [Tongwei TWMPF-66HD655](https://comparepv.com/panel/tw-solar-tongwei-twmpf-66hd655) | 655 W | -65 W, hotter, -2.1 pp | | [Tongwei TWMPF-66HD660](https://comparepv.com/panel/tw-solar-tongwei-twmpf-66hd660) | 660 W | -60 W, hotter, -2.0 pp | | [Tongwei TWMPF-66HD665](https://comparepv.com/panel/tw-solar-tongwei-twmpf-66hd665) | 665 W | -55 W, hotter, -1.8 pp | | [Tongwei TWMPF-66HD670](https://comparepv.com/panel/tw-solar-tongwei-twmpf-66hd670) | 670 W | -50 W, hotter, -1.6 pp | | [Tongwei TWMPF-66HD675](https://comparepv.com/panel/tw-solar-tongwei-twmpf-66hd675) | 675 W | -45 W, hotter, -1.5 pp | | [Tongwei TWMNF-66HD700XX](https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hd700xx) | 700 W | -20 W, -0.7 pp | | [Tongwei TWMNF-66HD705](https://comparepv.com/panel/tongwei-solar-twmnf-66hd705) | 705 W | -15 W, -0.5 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +85 W, cooler, +1.9 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +80 W, cooler, +1.7 pp | --- Source: https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hd720xx 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.