--- title: "Tongwei TWMNF-66HDH70X 720W Solar Panel: Specs & Datasheet | ComparePV" description: "Tongwei TWMNF-66HDH70X 720W solar panel. Specs: 23.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hdh70x" image: "https://comparepv.com/og/panel/tw-solar-tongwei-twmnf-66hdh70x.png" updated: 2026-09-11 --- # Tongwei TWMNF-66HDH70X Strong in heat, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Tongwei - **Model:** TWMNF-66HDH70X - **Series:** TWMNF 66HD700–720W - **Rated power:** 720 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 700-750 W (420 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 720 W | 715 W | Typical | | | Module efficiency | 23.20% | 23.00% | Strong - top 25% | 1,349 | | Power density | 231.8 | 230.2 | Typical | 1,390 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 1,347 | | 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% | 23.00% | Strong - top 25% | 1,349 | | Power density | 231.8 | 230.2 | Typical | 1,390 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 1,347 | | Weight per kWp | 52.6 | 52.9 | Typical | 6,317 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-0.280 %/°C temperature coefficient** - Top 11% of the TOPCon 700-750 W segment, against a median of -0.290. - **23.20% module efficiency** - Top 25% of the TOPCon 700-750 W segment, against a median of 23.00%. - **Best for:** Commercial, utility-scale and hot-climate. ## 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:** TOPCon - **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 | 1349 of 14129 | | Power density | 1390 of 14129 | | Temperature coefficient | 1347 of 14129 | | Weight | 6317 of 14129 | | Warranty | 21 of 14129 | ## About this series The Tongwei TWMNF 66HD700-720W series is designed for installations where maximizing yield from the same surface area and long-term reliability are key priorities. These are **bifacial** modules in a **dual glass** construction, capable of truly utilizing reflected light from the ground surface - making them ideal for flat rooftops, ballasted systems, and ground-mounted or rooftop solar farms with light-colored ground cover or membrane roofs. They stand out in the competitive market due to the combination of **N-type TOPCon** cells with technologies enhancing current flow and micro-crack resistance. The result is more stable performance over time, reduced risk of power losses, and higher energy production in less-than-ideal conditions - such as diffuse light, higher temperatures, or periodic soiling. This is an excellent choice for C&I and utility-scale investors seeking to lower the energy cost-of-ownership throughout the installation's lifecycle and prioritizing **ultra-low degradation** and a **30-year linear power warranty**. ## Notable figures - At 23.2% efficiency, this panel is on par with typical \*\*TOPCon 700-750W\*\* modules - At 231.8 W/m² power density, roof space requirements are typical for \*\*TOPCon 700-750W\*\* panels - At -0.28%/°C, hot weather performance is typical for \*\*TOPCon 700-750W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - #1349 for efficiency, #1347 for temperature performance out of 14129 panels ## Questions ### What is N-type TOPCon technology in Tongwei TWMNF 66HD700-720W panels and what are its advantages? N-type TOPCon cells use a passivated rear contact that reduces recombination losses, delivering higher efficiency (22.5-23.5%) and lower LID/LeTID degradation than standard PERC cells. Combined with a multi-busbar design, they also offer better resistance to microcracks. In the TWMNF 66HD700-720W series this translates into up to 720 Wp from a single 132-cell module and more stable long-term output. ### What does the bifacial dual glass design mean and which installations suit the TWMNF 66HD700-720W series? The dual glass bifacial design lets the rear side of the module capture light reflected off the ground, boosting energy yield. It performs especially well on flat roofs with light-colored membranes, ballasted mounting systems, and utility-scale PV farms with bright ground cover, where the bifacial gain can add several to over ten percent compared to a monofacial module. ### What warranty covers the Tongwei TWMNF 66HD700-720W series? The manufacturer provides a 12-year product warranty and a 30-year linear power warranty, standard for a premium tier-1 offering. Thanks to ultra-low annual degradation, the module retains a high share of its nominal power even near the end of its service life, lowering the levelized cost of energy (LCOE) over the system's lifetime. ### Do TWMNF 66HD700-720W panels perform well in high-temperature conditions? Yes. TOPCon cells have a favorable temperature coefficient of power (around -0.28%/°C), better than typical PERC cells. This means a smaller power loss as the module heats up, which matters on flat roofs or in utility-scale installations in warmer climates, where panels run hotter than tilted, well-ventilated rooftop arrays. ### Is the Tongwei TWMNF 66HD700-720W series still available for purchase? No, this series has been discontinued and replaced by the manufacturer's newer models. Availability is now limited to remaining distributor stock. This matters for larger C&I or utility-scale projects that need module batch consistency - sourcing additional panels from this exact series later may prove difficult. ### How much does the TWMNF 66HD700-720W module weigh and does it need special mounting hardware? The module measures roughly 2384x1303x33 mm and weighs nearly 38 kg, heavier than typical modules due to its dual glass construction (glass on both sides instead of a rear backsheet). Before installation, check the load capacity of the roof structure or ballast system - standard design practice for utility-scale and C&I projects. ## 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 | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | -45 W, 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 | --- Source: https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hdh70x 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.