--- title: "Tongwei TWMNF-66HD720 vs Tongwei TNC G12-66 Monofacial - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMNF-66HD720 vs Tongwei TNC G12-66 Monofacial side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-tnc-g12-66-monofacial" updated: 2026-09-11 --- # Tongwei TWMNF-66HD720 vs Tongwei TNC G12-66 Monofacial TWMNF-66HD720 leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 13 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Tongwei TWMNF-66HD720](https://comparepv.com/panel/tongwei-solar-twmnf-66hd720) | [Tongwei TNC G12-66 Monofacial](https://comparepv.com/panel/tongwei-tnc-g12-66-monofacial) | | Manufacturer | Tongwei | Tongwei | | Power | 720 Wp | 710 Wp | | Efficiency | 23.20 % | 22.90 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | TWMNF-66HD720 | TNC G12-66 Monofacial | Difference | | --- | --- | --- | --- | | Module efficiency | 23.20 % | 22.90 % | +0.30 pp for TWMNF-66HD720 | | Power density | 231.8 Wp/m² | 228.6 Wp/m² | +3.2 Wp/m² for TWMNF-66HD720 | | Rated power | 720 Wp | 710 Wp | +10 W for TWMNF-66HD720 | | Bifacial | Yes | No | Yes vs No | | Dimensions | 2384x1303x33 mm | 2384x1303 mm | 2384x1303x33 mm vs 2384x1303 mm | ## Every compared parameter | Parameter | TWMNF-66HD720 | TNC G12-66 Monofacial | | --- | --- | --- | | Rated power | 720 Wp | 710 Wp | | Module efficiency | 23.20 % | 22.90 % | | Power density | 231.8 Wp/m² | 228.6 Wp/m² | | Open-circuit voltage | 49.28 V | 48.94 V | | Voltage at max power | 41.03 V | 40.69 V | | Short-circuit current | 18.55 A | 18.45 A | | Current at max power | 17.55 A | 17.45 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.9 kg | 37.9 kg | | Weight per kWp | 52.6 kg/kWp | 53.4 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | - | | Bifacial | Yes | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, TWMNF-66HD720:** 24,157 kWh - **Cumulative output, TNC G12-66 Monofacial:** 23,822 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | TWMNF-66HD720 | TNC G12-66 Monofacial | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 710 W | 100.0% of rated power | | Cool, bright day | 40 °C | 690 W | 680 W | 95.8% of rated power | | Typical summer roof | 55 °C | 660 W | 650 W | 91.6% of rated power | | Hot roof | 70 °C | 629 W | 621 W | 87.4% of rated power | ## Against the whole database | Measure | TWMNF-66HD720 | TNC G12-66 Monofacial | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,306 | #2,359 | 14,005 | TWMNF-66HD720 leads by 1,053 places | | Power density | #1,347 | #2,474 | 14,005 | TWMNF-66HD720 leads by 1,127 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #6,266 | #7,271 | 14,005 | TWMNF-66HD720 leads by 1,005 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #516 | #817 | 14,005 | TWMNF-66HD720 leads by 301 places | ## Questions ### Which panel is better: Tongwei TWMNF-66HD720 or Tongwei TNC G12-66 Monofacial? According to our database: **Tongwei TWMNF-66HD720** has higher module efficiency (**23.20%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMNF-66HD720 and Tongwei TNC G12-66 Monofacial? **Tongwei TWMNF-66HD720** has a module efficiency of **23.20%**, while **Tongwei TNC G12-66 Monofacial** is **22.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMNF-66HD720 use vs Tongwei TNC G12-66 Monofacial? **Tongwei TWMNF-66HD720** uses **TOPCon** cells; **Tongwei TNC G12-66 Monofacial** uses **TOPCon**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Tongwei TWMNF-66HD720 and Tongwei TNC G12-66 Monofacial? **Tongwei TWMNF-66HD720** has a **30 years** power warranty; **Tongwei TNC G12-66 Monofacial** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are Tongwei TWMNF-66HD720 and Tongwei TNC G12-66 Monofacial bifacial panels? **Tongwei TWMNF-66HD720** is bifacial (captures light from both faces); **Tongwei TNC G12-66 Monofacial** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD750](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-solar-twmnf-66hd750) - 4 differences, the largest is module efficiency - [Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-solar-twmnf-66hd745) - 4 differences, the largest is module efficiency - [Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD740](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-solar-twmnf-66hd740) - 4 differences, the largest is module efficiency - [Tongwei TWMNF-66HD720 vs Tongwei THC G12-66 Bifacial](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-thc-g12-66-bifacial) - 7 differences, the largest is module efficiency - [Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD735](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-solar-twmnf-66hd735) - 3 differences, the largest is module efficiency - [Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD730](https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-solar-twmnf-66hd730) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tongwei-solar-twmnf-66hd720/tongwei-tnc-g12-66-monofacial Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.