--- title: "Tongwei TWMNF-66HD720 720W Solar Panel - Specs & Review | ComparePV" description: "Tongwei TWMNF-66HD720 720W solar panel: 1 shop offer from 495.19 zł. Specs: 23.20% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/tongwei-solar-twmnf-66hd720" updated: 2026-10-05 --- # Tongwei TWMNF-66HD720 Strong in heat, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Tongwei - **Model:** TWMNF-66HD720 - **Series:** TNC - **Rated power:** 720 W - **Cell technology:** TOPCon - **Bifacial:** yes ## Price offers Prices are the figure each shop printed, on that shop's side of VAT. | Shop | Market | Price | Per kWp | Availability | Last read | | --- | --- | --- | --- | --- | --- | | [PVhurt](https://comparepv.com/go/3321) | Poland | 495.19 zł incl. VAT | 687.76 zł/kWp | In stock | Last read 6 Oct 01:43 | ## 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% | 1,306 | | Power density | 231.8 | 230.2 | Typical | 1,347 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 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% | 23.00% | Strong - top 25% | 1,306 | | Power density | 231.8 | 230.2 | Typical | 1,347 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 1,309 | | Weight per kWp | 52.6 | 52.9 | Typical | 6,266 | | 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:** 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:** TOPCon - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### 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 % - **Annual degradation:** 0.40 % - **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 The Tongwei TNC series is a line of photovoltaic modules built around proprietary n-type TOPCon cells, developed by one of the world's largest solar cell manufacturers. What sets it apart is the combination of **half-cut cell technology** with a dense **multi-busbar** layout, which significantly reduces power losses from microcracks and shading while making current flow across the module more even. TNC panels rely on **advanced 3D passivation** that limits carrier recombination and helps maintain high efficiency even under weak, diffuse light - during early mornings, fog, or low sun angles. A major strength of the series is its **high bifaciality**, which lets the module capture extra energy from light reflected onto its rear side, meaningfully lowering the cost of energy per installed watt. The TNC series performs well both in rooftop installations and large-scale solar farms, where long-term output stability matters most. Its rugged construction and extended manufacturer warranty make it an attractive choice for investors seeking predictable returns with limited risk of power degradation over time. ## Notable figures - Efficiency of 23.2% matches the \*\*TOPCon 700-750W\*\* median - At 231.8 W/m² power density, roof space requirements are typical for \*\*TOPCon 700-750W\*\* panels - Temperature coefficient of -0.28%/°C matches the \*\*TOPCon 700-750W\*\* median - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - #1306 for efficiency, #1309 for temperature performance out of 14005 panels ## Questions ### How does TOPCon cell technology in Tongwei TNC panels differ from standard PERC cells? The n-type TOPCon cells used in the TNC series feature an additional rear-side passivation layer that reduces carrier recombination and lowers current losses compared to conventional PERC cells. As a result, TNC modules reach efficiencies up to 23.3% and a lower annual degradation rate. In practice this means higher energy yield from the same roof area throughout the entire lifetime of the installation. ### Will a 725 Wp Tongwei TNC panel fit on a typical residential pitched roof? The 725 Wp TNC panel measures 2384x1303x33 mm and weighs 37.9 kg, sizing similar to large industrial-format modules also used on large residential roof areas. Lower-power variants within the same series are also available and better suited to smaller prosumer installations. Because of the panel weight, a sturdy mounting structure is required, but the module itself is fully compatible with standard racking systems. ### What warranty do Tongwei TNC panels carry, and how much power do they retain after 30 years? The TNC series comes with a 12-year product warranty and a 30-year linear power warranty guaranteeing at least 87.4% of the original rated power after three decades of operation. This matches the level typical of top-tier n-type TOPCon modules and means slower annual degradation than older PERC technology, translating into a higher and more predictable return on investment. ### How much extra energy does bifaciality add to Tongwei TNC panels? Thanks to their bifacial design, TNC panels capture light reflected from the ground onto the rear side of the module, which, depending on surface albedo, mounting height, and tilt angle, can add roughly a few to over ten percent of annual energy compared to a monofacial panel of the same rated power. The effect is strongest over bright surfaces such as gravel or white roofing membrane, and in ground-mount or east-west installations. ### Do Tongwei TNC panels perform well in winter and under low, diffuse light? Yes, TNC modules have a power temperature coefficient of -0.28%/°C, meaning lower output loss at high temperatures than older technologies, while cold winter temperatures actually favor silicon cell performance. In addition, advanced 3D passivation reduces losses under weak, diffuse light typical of cloudy days, fog, or early morning hours, resulting in more stable energy production throughout the year. ### Is the Tongwei TNC series better suited to large solar farms or does it also work on commercial and residential roofs? The TNC series is designed for universal use, deployed both in utility-scale solar farms, where long-term production stability over 25-30 years matters most, and on commercial and residential roof installations. A robust construction, high per-module power up to 725 Wp, and bifaciality allow it to reduce the cost of energy per watt installed in both applications. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Datasheet-of-Tongwei-solar-panel-TWMNF-66HD705725WB33-2920-3cd4e525dc3f.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/tongwei-solar-twmnf-66hd720 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.